CN105743608A - Method and apparatus for analyzing space frequency block code - Google Patents

Abstract

The invention discloses a method for analyzing space frequency block codes, which includes determining the noise floor of each receiving antenna respectively, wherein the number of the receiving antennas is at least two; transforming the frequency-domain received signals of the antennas; performing space-frequency block code decoding according to the transformed frequency-domain received signals of each receiving antenna. The invention also discloses a device for analyzing space frequency block codes. The invention optimizes the method for analyzing space frequency block codes and improves the performance of the wireless communication system.

Description

Method and device for analyzing space frequency block codes

technical field

The invention relates to the communication field, in particular to a method and device for analyzing space frequency block codes.

Background technique

In the wireless mobile communication system, after the signal is transmitted, it will encounter various interferences during the transmission process, which will cause signal attenuation. Diversity reception technology is one of the technical measures that are often used to effectively resist fading and improve link reliability. The basic principle of diversity reception is to receive multiple copies of the same information through multiple channels (time, frequency or space). Since the transmission characteristics of multiple channels are different, the fading of multiple copies of the signal will not be the same, so it can Use a certain signal combination technology so that the information contained in multiple copies can be restored to the original sent signal more correctly. Diversity reception is to resist the adverse effects caused by fading by improving the received signal, but this improvement needs to increase the complexity of the receiver.

The LTE (Long Term Evolution, Long Term Evolution System) standard uses SFBC (Space Frequency Block Code, Space Frequency Block Code) as a transmit diversity scheme for two antenna ports. Space frequency encoder. For example, for an SFBC system with two transmitting antennas, assuming that the symbol streams input to the SFBC encoder are C1, C2, ..., then C1 and C2 are transmitted on the first subcarriers of antenna 1 and antenna 2 respectively, while the symbol streams of antenna 1 and antenna 2 are -C2* and -C1* are respectively transmitted on the second subcarrier. Wherein ()* represents the conjugate of a complex number, and the signal transmission in LTE adopts OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology. For the receive diversity scheme using SFBC as two antenna ports, the commonly used method for analyzing SFBC does not take into account the different noise floor of receiving antennas, and the different noise floor of different receiving antennas also has a certain impact on the analysis of SFBC, so here In this case, the restored transmitted signal quality is not optimal.

Contents of the invention

The main purpose of the present invention is to provide a method and device for analyzing space frequency block codes, aiming to restore the transmitted signal with higher quality, reduce signal attenuation, and improve the performance of the wireless communication system.

To achieve the above object, the present invention provides a method for parsing spatial frequency block codes, including:

Determining the noise floor of each receiving antenna separately, wherein the number of receiving antennas is at least two;

transforming the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna;

performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna.

Preferably, said respectively determining the noise floor of each receiving antenna includes:

grouping the channel estimation values of each OFDM pilot symbol on the frequency domain signal bandwidth of each receiving antenna, wherein the channel estimation values in each group of channel estimation value groups are adjacent pilot symbols the corresponding channel estimate;

Calculate the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna.

Preferably, the calculating the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna includes:

calculating a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antennas;

calculating the absolute value of the average of all conjugate multiplied values based on each of said conjugate multiplied values;

Calculating the power value of each pilot symbol according to the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna;

calculating an average value of the power values of all pilot symbols according to the power value of each pilot symbol;

Calculating the absolute value of the difference between the absolute value of the average value of all conjugate multiplication values and the average value of the power values of all pilot symbols, the absolute value of the difference is the noise power value of the receiving antenna ;

Calculate the arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, and the arithmetic square root is the noise floor of the receiving antenna.

Preferably, the transforming the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna includes:

Dividing the received signal in the frequency domain of each receiving antenna by the noise floor of the receiving antenna to obtain the received signal in the frequency domain transformed by each antenna.

Preferably, said performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna includes:

performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna, and determining an estimated value of the transmitted signal of the transmitting antenna corresponding to each receiving antenna.

In addition, in order to achieve the above object, the present invention also provides a device for parsing a space frequency block code, the device for parsing a space frequency block code includes:

A noise floor determining module, configured to separately determine the noise floor of each receiving antenna, wherein the number of receiving antennas is at least two;

A frequency-domain signal transformation module, configured to transform the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna;

The space frequency block code decoding module is configured to perform space frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna.

Preferably, the noise floor determination module includes:

The grouping submodule is used to group the channel estimation values of each OFDM pilot symbol on the frequency domain signal bandwidth of each receiving antenna, wherein the channel estimation values in each group of channel estimation value groups are Channel estimation values corresponding to adjacent pilot symbols;

The noise floor calculation submodule is configured to calculate the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna.

Preferably, the noise floor calculation submodule includes:

a conjugate multiplication value calculation unit, configured to calculate a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antenna;

The first calculation unit is used to calculate the absolute value of the average value of all conjugate multiplication values according to each of the conjugate multiplication values;

The pilot symbol power value calculation unit is used to calculate the power value of each pilot symbol according to the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna;

A second calculation unit, configured to calculate the average value of the power values of all pilot symbols according to the power value of each pilot symbol;

The receiving antenna noise power value calculation unit is used to calculate the absolute value of the difference between the absolute value of the mean value of all conjugate multiplication values and the mean value of the power values of all pilot symbols, and the difference value The absolute value is the noise power value of the receiving antenna;

The receiving antenna noise floor calculation unit is used to calculate the arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, and the arithmetic square root is the noise floor of the receiving antenna.

Preferably, the frequency domain signal transformation module is also used for:

Dividing the received signal in the frequency domain of each receiving antenna by the noise floor of the receiving antenna to obtain the received signal in the frequency domain transformed by each antenna.

Preferably, the spatial frequency block code decoding module is also used for:

performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna, and determining an estimated value of the transmitted signal of the transmitting antenna corresponding to each receiving antenna.

The invention determines the noise floor of the receiving antenna, transforms the frequency-domain receiving signal of the receiving antenna according to the noise floor of the receiving antenna, and finally performs SFBC decoding according to the transformed frequency-domain receiving signal. The present invention takes into account the influence of different noise floors of different receiving antennas on the received signal, and normalizes the noise floor values of different receiving antennas, thereby further optimizing the method for analyzing SFBC. Under this condition, the performance of the wireless communication system can be further improved.

Description of drawings

Fig. 1 is the transmitting terminal of the communication system with two transmitting antennas in the LTE system of the preferred embodiment of the present invention;

Fig. 2 is the receiving end of the communication system with two receiving antennas in the LTE system of the preferred embodiment of the present invention;

FIG. 3 is a schematic flow chart of a first embodiment of a method for parsing a space frequency block code according to the present invention;

4 is a schematic flow diagram of a second embodiment of a method for parsing a space frequency block code according to the present invention;

5 is a schematic flow chart of a third embodiment of a method for parsing a space-frequency block code according to the present invention;

Fig. 6 is a schematic diagram of the grouping mode of pilot symbols in the present invention;

7 is a schematic diagram of the functional modules of the first embodiment of the device for parsing spatial frequency block codes according to the present invention;

Fig. 8 is a schematic diagram of the functional modules of the second embodiment of the device for parsing spatial frequency block codes according to the present invention;

FIG. 9 is a schematic diagram of the functional modules of the third embodiment of the device for parsing spatial frequency block codes according to the present invention;

Fig. 10 is a schematic diagram showing the implementation performance comparison between the existing analytic SFBC method (Original) and the analytic SFBC method (New) of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The core idea of the present invention is to transform the frequency domain signals of the corresponding receiving antennas by transforming the different noise floors of different receiving antennas, so as to realize the normalization processing of the different noise floors of different receiving antennas, and then according to the transformed frequency domain The signal is decoded by SFBC, so as to achieve the purpose of further optimizing and analyzing the SFBC method of the receiving antenna under the influence of different noise floor factors, and improve the performance of the wireless communication system. The core idea of the present invention is applicable to any form of multi-transmission (multiple transmitting antennas) and multi-receiving (multiple receiving antennas) SFBC decoding method. In the embodiment of the present invention, the SFBC decoding method of two transmissions and two receptions is specifically used as an example for illustration.

The specific structure and implementation method steps of the present invention will be described below according to the description of the accompanying drawings

Referring to FIG. 1 , FIG. 1 is a transmitting end of a communication system with two transmitting antennas in an LTE system according to a preferred embodiment of the present invention. The transmitting end includes a channel encoder 11 , a modulator 12 , an SFBC encoder 13 , a transmitting antenna 14 and a transmitting antenna 15 . Among them, the channel coder 11 performs channel coding on the signal from the signal source, and inputs the channel coded channel into the modulator 12 for digital modulation. Then the modulated signal is input into the SFBC encoder 13 to perform SFBC encoding on the modulated signal. Finally, the coded signal is sent to the receiving end through the transmitting antenna 14 and the transmitting antenna 15 . In the antenna transmit diversity scheme at both ends of the LTE system, the channel estimation values of pilot symbols are divided into two groups for SFBC encoding, and the same SFBC encoding block occupies two adjacent subcarriers of two transmit antennas. For example, assuming that the symbol streams input to SFBC encoder 13 are C1, C2, ..., C1 and C2 are respectively transmitted on the first subcarriers of transmitting antenna 14 and transmitting antenna 15, while the second subcarriers of transmitting antenna 14 and transmitting antenna 15 -C2* and -C1* are respectively transmitted on the carrier. Among them, ()* represents the conjugate of a complex number, and OFDM technology is used for signal transmission in LTE.

Referring to FIG. 2 , FIG. 2 is a receiving end of a communication system with two receiving antennas in an LTE system according to a preferred embodiment of the present invention. The receiving end receives the coded signal sent from the transmitting end. The receiving end includes a channel decoder 21 , a demodulator 22 , an SFBC decoder 23 , a receiving antenna 24 and a receiving antenna 25 . Wherein, the SFBC decoder 23 decodes the coded signal received from the transmitter and inputs it to the demodulator 22 for demodulation to restore the original modulation signal, and then inputs the demodulated modulation signal into the channel decoder 21, thereby Restore the original signal (that is, the sink).

Further, referring to FIG. 3 , FIG. 3 is a schematic flowchart of a first embodiment of a method for analyzing a space-frequency block code according to the present invention. In this embodiment, the method for analyzing the spatial frequency block code includes:

Step S10, respectively determining the noise floor of each receiving antenna, wherein the number of receiving antennas is at least two;

Whether any wireless communication receiver can work normally depends not only on the size of the input signal that can be obtained, but also on the size of its internal noise and external noise and interference. The noise floor of the receiver is generated by electronic movement, and the noise floor of different devices is also different. The noise floor of different receiving antennas will affect the combined restoration of the signal. Therefore, the number of receiving antennas targeted by the present invention should be at least two. There are many industry-wide calculation methods for the noise floor of receiving antennas, so they will not be described in detail here. The steps for calculating the noise floor of each receiving antenna are the same.

Step S20, transforming the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna;

According to the noise floor of each receiving antenna determined in step S10, the frequency-domain received signals of each receiving antenna are transformed. In this embodiment, transforming the frequency-domain received signal of the receiving antenna can not only integrate the noise floor parameters of the receiving antenna into the calculation formula of the frequency-domain received signal, but also realize the normalization of the noise floor of each receiving antenna Processing, any method that can achieve the above two points can be used as a method for transforming the received signal in the frequency domain by the noise floor of the receiving antenna.

Step S30, performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna.

Carry out SFBC decoding according to the frequency-domain received signals of the receiving antennas transformed in step S20, at this time, the algorithm for analyzing SFBC considers the impact of the noise floor of each receiving antenna on SFBC decoding, and meanwhile, the noise floor of each receiving antenna is Normalization was performed during the calculation. There are many general calculation methods for analyzing SFBC decoding based on frequency-domain signals, so this step will not be repeated here.

In this embodiment, by calculating and determining the noise floor of each receiving antenna, then transforming the frequency domain signal according to the noise floor of the receiving antenna, and finally performing SFBC decoding according to the transformed frequency signal, so as to obtain the decoding of the signal code formula algorithm. In this embodiment, since different receiving devices have different corresponding noise floors, this will definitely affect the performance of SFBC decoding. Therefore, the present invention transforms the noise floor of each receiving antenna to normalize the noise floor of each receiving antenna, thereby further optimizing and improving the SFBC decoding performance and reducing the bit error rate of the wireless communication system.

Further, referring to FIG. 4, FIG. 4 is a schematic flow chart of the second embodiment of the method for analyzing the space frequency block code of the present invention. Based on the first embodiment of the method for analyzing the space frequency block code of the present invention, the analysis of the space frequency block in this embodiment The method of code comprises in above-mentioned step S10:

Step S101, grouping the channel estimation values of each OFDM pilot symbol on the frequency domain signal bandwidth of each receiving antenna, wherein the channel estimation values in each group of channel estimation value groups are adjacent The channel estimation value corresponding to the pilot symbol;

In order to simplify the calculation method and process, in this embodiment, the channel estimation values of the pilot symbols need to be grouped and then calculated in a matrix manner. Wherein, each group of channel estimation values may consist of two, or four, or six even-numbered adjacent channel estimation values.

Step S102, calculating the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna.

In this embodiment, by grouping the channel estimation values of each OFDM pilot symbol on the signal bandwidth of each receiving antenna, and then calculating the bottom of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna noise. The calculation steps of the noise floor of each receiving antenna are the same. After the channel estimation values of the pilot symbols are grouped, the calculation process can be simplified by using the matrix method.

Further, referring to FIG. 5, FIG. 5 is a schematic flow chart of the third embodiment of the method for analyzing the spatial frequency block code of the present invention. Based on the second embodiment of the method for analyzing the spatial frequency block code of the present invention, the analysis of the spatial frequency block in this embodiment The code method comprises in above-mentioned step S102:

Step S1021, calculating a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antennas;

Step S1022, according to each conjugate multiplication value, calculate the absolute value of the average value of all conjugate multiplication values;

According to each conjugate multiplication value, the absolute value of the average value of all conjugate multiplication values is calculated to obtain the signal power.

Step S1023, calculating the power value of each pilot symbol according to the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna;

Step S1024, calculating the average value of the power values of all pilot symbols according to the power value of each pilot symbol;

According to the power value of each pilot symbol, an average value of the power values of all pilot symbols is calculated to obtain the total power.

Step S1025, calculating the absolute value of the difference between the absolute value of the average value of all conjugate multiplication values and the average value of the power values of all pilot symbols, the absolute value of the difference is the receiving antenna Noise power value;

Step S1026: Calculate the arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, and the arithmetic square root is the noise floor of the receiving antenna.

In this embodiment, each group of channel estimation values is preferably composed of channel estimation values corresponding to two adjacent pilot symbols. Then calculate the conjugate multiplication value for each group of channel estimation values, calculate the absolute value after taking the average value of these conjugate multiplication values, and obtain the signal power. Calculate the power value of the channel estimation value of each pilot symbol, and calculate the average value of these power values to obtain the total power. The signal power is then subtracted from the total power to obtain the noise power for each receive antenna. The noise power value of the receiving antenna is the square of the noise floor value of the receiving antenna, so the square root of the noise power value of the receiving antenna is the noise floor value of the receiving antenna. Wherein, the steps of the above calculation method are the calculation steps of the noise floor of one receiving antenna, and the steps of the calculation method of the noise floor of other receiving antennas are the same.

Further, based on any one of steps S20 in the first to third embodiments of the method for analyzing space-frequency block codes of the present invention, the fourth embodiment of the method for analyzing space-frequency block codes of the present invention includes in the above-mentioned step S20: The frequency-domain received signal of each receiving antenna is divided by the noise floor of the receiving antenna to obtain the frequency-domain received signal transformed by each antenna.

Assume that the channel coefficients of transmitting antenna 1 and transmitting antenna 2 and receiving antenna 1 are h ¹¹ and h ²¹ respectively, and the channel coefficients of transmitting antenna 1 and transmitting antenna 2 and receiving antenna 2 are h ¹² and h ²² respectively;

The signal of receiving antenna 1 carrier k is The signal of receiving antenna 2 carrier k is The signal of receiving antenna 1 carrier k+1 is The signal of receiving antenna 2 carrier k+1 is

The transmitted signal of carrier k is x _k , and the transmitted signal of carrier k+1 is x _k+1 .

The noise of receiving antenna 1 carrier k is The noise of receiving antenna 2 carrier k is The noise of receiving antenna 1 carrier k+1 is The noise of receiving antenna 2 carrier k+1 is

Then the received signal in the frequency domain is expressed in matrix form as follows:

$\left[\begin{array}{c}{r}_k^1\\ r_{k+1}^{1*}\\ r_k^2\\ r_{k+1}^{2*}\end{array}\right]=\left[\begin{array}{cc}{h}_k^{11}& h_k^{\mathrm{twenty\; one}}\\ h_{k+1}^{\mathrm{twenty\; one}*}& -h_{k+1}^{11*}\\ h_k^{12}& h_k^{\mathrm{twenty\; two}}\\ h_{k+1}^{\mathrm{twenty\; two}*}& -h_{k+1}^{12*}\end{array}\right]\left[\begin{array}{c}{x}_k\\ x_{k+1}\end{array}\right]+\left[\begin{array}{c}{\mathrm{no}}_k^1\\ {\mathrm{no}}_{k+1}^{1*}\\ b_k^2\\ {\mathrm{no}}_{k+1}^{2*}\end{array}\right],$ where ()* represents the conjugate of a complex number.

According to the noise floor of each antenna, the received signal of each receiving antenna is transformed as follows, that is, the received signal of each antenna is divided by the noise floor of each antenna. The specific transformation form is as follows:

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; \&DoubleRightArrow;</span>\begin{array}{}\end{array}\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]$

After the above changes are made to the received signals of each receiving antenna, the received signal matrix in the frequency domain can be expressed as follows:

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cc}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}\\ {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right]<span\; class="notranslate">\; +</span>\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]$

In this embodiment, the received signal of each antenna is divided by the noise floor of each receiving antenna, so as to realize the conversion of the frequency domain signal of each receiving antenna, and also realize the normalization processing of the noise floor of different receiving antennas, The transformed received signal in the frequency domain can balance the impact of the noise floor factors of different receiving antennas on the performance of the SFBC decoding method, so that the estimated value of the original transmitted signal can be decoded with higher quality.

Further, based on any one of steps S30 in the first to fourth embodiments of the method for analyzing space-frequency block codes of the present invention, the fifth embodiment of the method for analyzing space-frequency block codes of the present invention includes in the above step S30: according to the transformation After the frequency-domain received signal of each receiving antenna is decoded with a space frequency block code, the estimated value of the transmitted signal of the transmitting antenna corresponding to each receiving antenna is determined.

SFBC decoding is performed according to the transformed received signal in the frequency domain. Since the channel coefficients of adjacent carriers are not very different, for ease of calculation, the present invention assumes that the channel coefficients of adjacent carriers are the same, that is:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}$

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}$

According to the above assumptions, the calculation matrix of the estimated value of the transmitted signal after SFBC decoding can be obtained as follows:

$\left[\begin{array}{c}{\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}}_{\mathrm{<span\; class="notranslate">\; k</span>}}\\ {\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\frac{\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]}{{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

According to the above-mentioned estimated value formula of the transmitted signal after SFBC decoding, different SFBC encoded blocks received by each receiving antenna can be decoded, so as to finally obtain the estimated value of the restored original transmitted signal.

In this embodiment, considering the influence of different receiving antennas on the analysis of SFBC coding performance under different conditions of noise floor, the SFBC decoding method can be further optimized according to the frequency-domain received signals transformed by each receiving antenna, so as to obtain a better transmitted signal Estimate calculation method.

Further, referring to FIG. 7 , FIG. 7 is a schematic diagram of functional modules of a first embodiment of an apparatus for analyzing space-frequency block codes according to the present invention. In this embodiment, the device for parsing the spatial frequency block code includes:

The noise floor determination module 10 is used to determine the noise floor of each receiving antenna respectively, wherein the number of the receiving antennas is at least two;

Whether any wireless communication receiver can work normally depends not only on the size of the input signal that can be obtained, but also on the size of its internal noise and external noise and interference. The noise floor of the receiver is generated by electronic movement, and the noise floor of different devices is also different. The noise floor of different receiving antennas will affect the combined restoration of the signal. Therefore, the number of receiving antennas targeted by the present invention should be at least two. There are many industry-wide calculation methods for receiving antenna noise floor, so I won’t repeat them here. The calculation steps of the noise floor of each receiving antenna are the same.

A frequency-domain signal conversion module 20, configured to convert the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna;

According to the noise floor of each receiving antenna determined by the noise floor determining module 10 , the frequency domain signal transforming module 20 transforms the frequency domain received signal of each receiving antenna. In this embodiment, transforming the frequency-domain received signal of the receiving antenna can not only integrate the noise floor parameters of the receiving antenna into the calculation formula of the frequency-domain received signal, but also realize the normalization of the noise floor of each receiving antenna Processing, any method that can achieve the above two points can be used as a method for transforming the received signal in the frequency domain by the noise floor of the receiving antenna.

The space-frequency block code decoding module 30 is configured to perform space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna.

The spatial frequency block code decoding module 30 performs SFBC decoding according to the frequency-domain receiving signals of the receiving antennas transformed by the frequency-domain signal conversion module 20. At this time, the algorithm for analyzing SFBC considers the influence of the noise floor of each receiving antenna on the SFBC decoding, and at the same time , the noise floor of each receiving antenna is also normalized during the calculation process. There are many general calculation methods for analyzing SFBC decoding based on frequency-domain signals, so this step will not be repeated here.

In this embodiment, the noise floor determination module 10 calculates and determines the noise floor of each receiving antenna, then the frequency domain signal conversion module 20 transforms the frequency domain signal according to the noise floor of the receiving antennas, and finally the spatial frequency block code decoding module 30 again SFBC decoding is performed according to the transformed frequency signal, so as to obtain the formula algorithm for decoding the signal code. In this embodiment, since different receiving devices have different corresponding noise floors, this will definitely affect the performance of SFBC decoding. Therefore, the present invention transforms the noise floor of each receiving antenna to normalize the noise floor of each receiving antenna, thereby further optimizing and improving the SFBC decoding performance and reducing the bit error rate of the wireless communication system.

Further, referring to FIG. 8, FIG. 8 is a schematic diagram of the functional modules of the second embodiment of the device for analyzing spatial frequency block codes of the present invention. Based on the above-mentioned first embodiment of the device for analyzing spatial frequency block codes of the present invention, the spatial frequency analysis of this embodiment The device floor noise determination module 10 of block code comprises:

The grouping sub-module 101 is configured to group the channel estimation values of each OFDM pilot symbol on the frequency-domain signal bandwidth of each receiving antenna, wherein the channel estimation values in each group of channel estimation value groups is the channel estimation value corresponding to the adjacent pilot symbols;

In order to simplify the calculation method and process, in this embodiment, the grouping unit 101 needs to group the channel estimation values of the pilot symbols, and then use a matrix method to perform calculation. Wherein, each group of channel estimation values may be composed of channel estimation values of two, or four, or six even-numbered adjacent pilot symbols.

The noise floor calculation sub-module 102 is configured to calculate the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna.

In this embodiment, the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna is grouped by the grouping unit 101, and then the noise floor calculation unit 102 estimates Value, calculate the noise floor of each receiving antenna. The calculation steps of the noise floor of each receiving antenna are the same. After the channel estimation values of the pilot symbols are grouped, the calculation process can be simplified by using the matrix method.

Further, referring to FIG. 9, FIG. 9 is a schematic diagram of the functional modules of the third embodiment of the device for analyzing space-frequency block codes of the present invention. Based on the second embodiment of the device for analyzing space-frequency block codes of the present invention, the calculation of the noise floor in this embodiment Submodule 102 includes:

A conjugate multiplication value calculation unit 1021, configured to calculate a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antennas;

The first calculation unit 1022 is configured to calculate the absolute value of the average value of all conjugate multiplication values according to each conjugate multiplication value;

According to each conjugate multiplication value, the absolute value of the average value of all conjugate multiplication values is calculated to obtain the signal power.

The pilot symbol power value calculation unit 1023 is used to calculate the power value of each pilot symbol according to the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna;

The second calculation unit 1024 is configured to calculate the average value of the power values of all pilot symbols according to the power value of each pilot symbol;

According to the power value of each pilot symbol, an average value of the power values of all pilot symbols is calculated to obtain the total power.

The receiving antenna noise power value calculation unit 1025 is configured to calculate the absolute value of the difference between the absolute value of the average value of all conjugate multiplication values and the average value of the power values of all pilot symbols, the difference The absolute value of is the noise power value of the receiving antenna;

The receiving antenna noise floor calculation unit 1026 is configured to calculate the arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, and the arithmetic square root is the noise floor of the receiving antenna.

In this embodiment, each group of channel estimation values is preferably composed of channel estimation values corresponding to two adjacent pilot symbols. Then calculate the conjugate multiplication value for each group of channel estimation values, calculate the absolute value after taking the average value of these conjugate multiplication values, and obtain the signal power. Calculate the power value of the channel estimation value of each pilot symbol, and calculate the average value of these power values to obtain the total power. The signal power is then subtracted from the total power to obtain the noise power for each receive antenna. The noise power value of the receiving antenna is the square of the noise floor value of the receiving antenna, so the square root of the noise power value of the receiving antenna is the noise floor value of the receiving antenna. Wherein, the steps of the above calculation method are the calculation steps of the noise floor of one receiving antenna, and the steps of the calculation method of the noise floor of other receiving antennas are the same.

Further, based on the frequency-domain signal conversion module 20 of any one of the first to third embodiments of the device for analyzing space-frequency block codes of the present invention, the frequency-domain signal conversion module 20 in the fourth embodiment of the device for analyzing space-frequency block codes of the present invention It is also used to divide the frequency-domain received signal of each receiving antenna by the noise floor of the receiving antenna to obtain the frequency-domain received signal transformed by each antenna.

Assume that the channel coefficients of transmitting antenna 1 and transmitting antenna 2 and receiving antenna 1 are h ¹¹ and h ²¹ respectively, and the channel coefficients of transmitting antenna 1 and transmitting antenna 2 and receiving antenna 2 are h ¹² and h ²² respectively;

The signal of receiving antenna 1 carrier k is The signal of receiving antenna 2 carrier k is The signal of receiving antenna 1 carrier k+1 is The signal of receiving antenna 2 carrier k+1 is

The transmitted signal of carrier k is x ^k , and the transmitted signal of carrier k+1 is x _k+1 .

The noise of receiving antenna 1 carrier k is The noise of receiving antenna 2 carrier k is The noise of receiving antenna 1 carrier k+1 is The noise of receiving antenna 2 carrier k+1 is

Then the received signal in the frequency domain is expressed in matrix form as follows:

$\left[\begin{array}{c}{r}_k^1\\ r_{k+1}^{1*}\\ r_k^2\\ r_{k+1}^{2*}\end{array}\right]=\left[\begin{array}{cc}{h}_k^{11}& h_k^{\mathrm{twenty\; one}}\\ h_{k+1}^{\mathrm{twenty\; one}*}& -h_{k+1}^{11*}\\ h_k^{12}& h_k^{\mathrm{twenty\; two}}\\ h_{k+1}^{\mathrm{twenty\; two}*}& -h_{k+1}^{12*}\end{array}\right]\left[\begin{array}{c}{x}_k\\ x_{k+1}\end{array}\right]+\left[\begin{array}{c}{\mathrm{no}}_k^1\\ {\mathrm{no}}_{k+1}^{1*}\\ b_k^2\\ {\mathrm{no}}_{k+1}^{2*}\end{array}\right],$ where ()* represents the conjugate of a complex number.

According to the noise floor of each antenna, the received signal of each receiving antenna is transformed as follows, that is, the received signal of each antenna is divided by the noise floor of each antenna. The specific transformation form is as follows:

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}\end{array}\right]<span\; class="notranslate">\; \&DoubleRightArrow;</span>\begin{array}{}\end{array}\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]$

After the above changes are made to the received signals of each receiving antenna, the received signal matrix in the frequency domain can be expressed as follows:

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cc}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& <span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}\\ {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right]<span\; class="notranslate">\; +</span>\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]$

In this embodiment, the received signal of each antenna is divided by the noise floor of each receiving antenna, so as to realize the conversion of the frequency domain signal of each receiving antenna, and also realize the normalization processing of the noise floor of different receiving antennas, The transformed received signal in the frequency domain can balance the impact of the noise floor factors of different receiving antennas on the performance of the SFBC decoding method, so that the estimated value of the original transmitted signal can be decoded with higher quality.

Further, based on any one of the space frequency block code decoding modules 30 in the first to fourth embodiments of the device for parsing space frequency block codes of the present invention, the space frequency block in the fifth embodiment of the device for parsing space frequency block codes of the present invention The code decoding module 30 is further configured to perform space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna, and determine the estimated value of the transmitted signal of the transmitting antenna corresponding to each receiving antenna.

SFBC decoding is performed according to the transformed received signal in the frequency domain. Since the channel coefficients of adjacent carriers are not very different, for ease of calculation, the present invention assumes that the channel coefficients of adjacent carriers are the same, that is:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}$

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}$

According to the above assumptions, the calculation matrix of the estimated value of the transmitted signal after SFBC decoding can be obtained as follows:

$\left[\begin{array}{c}{\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}}_{\mathrm{<span\; class="notranslate">\; k</span>}}\\ {\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>\frac{\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}<span\; class="notranslate">\; *</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; *</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]}{{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 11</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; 12</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; h</span>}}^{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; |</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&delta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

According to the above-mentioned estimated value formula of the transmitted signal after SFBC decoding, different SFBC encoded blocks received by each receiving antenna can be decoded, so as to finally obtain the estimated value of the restored original transmitted signal.

In this embodiment, considering the influence of different receiving antennas on the analysis of SFBC coding performance under different conditions of noise floor, the SFBC decoding method can be further optimized according to the frequency-domain received signals transformed by each receiving antenna, so as to obtain a better transmitted signal Estimate calculation method.

Referring to FIG. 10 , FIG. 10 is a schematic diagram showing the performance comparison between the existing analytical SFBC method (Original) and the analytical SFBC method (New) of the present invention. Among them, the simulated channel is AWGN, the simulated bandwidth is 10M, and the noise floor difference between receiving antenna 0 and receiving antenna 1 is 5dB. It can be seen from the figure that in the case of unbalanced noise floor of the two receiving antennas, the decoding performance of the new algorithm for solving SFBC is about 1.5dB higher than that of the original algorithm. Therefore, it can be explained that the noise floor of the receiving antenna is different And under the condition of unbalanced, adopting the optimized new algorithm for parsing SFBC of the present invention has obvious performance improvement.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. a method for parsing space frequency block codes, is characterized in that, the method for described parsing space frequency block codes comprises: Determining the noise floor of each receiving antenna separately, wherein the number of receiving antennas is at least two; transforming the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna; performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna. 2. the method for parsing the space frequency block code as claimed in claim 1, is characterized in that, described respectively determining the noise floor of each receiving antenna comprises: grouping the channel estimation values of each OFDM pilot symbol on the frequency domain signal bandwidth of each receiving antenna, wherein the channel estimation values in each group of channel estimation value groups are adjacent pilot symbols the corresponding channel estimate; Calculate the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna. 3. the method for parsing the space frequency block code as claimed in claim 2, is characterized in that, described according to each group of channel estimation values corresponding to each receiving antenna, calculating the noise floor of each receiving antenna includes: calculating a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antennas; calculating the absolute value of the average of all conjugate multiplied values based on each of said conjugate multiplied values; Calculating the power value of each pilot symbol according to the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna; calculating an average value of the power values of all pilot symbols according to the power value of each pilot symbol; Calculating the absolute value of the difference between the absolute value of the average value of all conjugate multiplication values and the average value of the power values of all pilot symbols, the absolute value of the difference is the noise power value of the receiving antenna ; Calculate the arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, and the arithmetic square root is the noise floor of the receiving antenna. 4. the method for analyzing space-frequency block code as described in any one in claim 1-3, it is characterized in that, described according to the noise floor of each receiving antenna, transforming the frequency-domain received signal of receiving antenna comprises : Dividing the received signal in the frequency domain of each receiving antenna by the noise floor of the receiving antenna to obtain the received signal in the frequency domain transformed by each antenna. 5. the method for parsing the space-frequency block code as claimed in claim 4, is characterized in that, carrying out the space-frequency block code decoding comprises: performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna, and determining an estimated value of the transmitted signal of the transmitting antenna corresponding to each receiving antenna. 6. a kind of device of parsing space frequency block code, it is characterized in that, the device of described parsing space frequency block code comprises: A noise floor determining module, configured to separately determine the noise floor of each receiving antenna, wherein the number of receiving antennas is at least two; A frequency-domain signal transformation module, configured to transform the frequency-domain received signal of the receiving antenna according to the noise floor of each receiving antenna; The space frequency block code decoding module is configured to perform space frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna. 7. the device of parsing spatial frequency block code as claimed in claim 6, is characterized in that, described noise floor determination module comprises: The grouping submodule is used to group the channel estimation values of each OFDM pilot symbol on the frequency domain signal bandwidth of each receiving antenna, wherein the channel estimation values in each group of channel estimation value groups are Channel estimation values corresponding to adjacent pilot symbols; The noise floor calculation submodule is configured to calculate the noise floor of each receiving antenna according to each group of channel estimation values corresponding to each receiving antenna. 8. the device of parsing spatial frequency block code as claimed in claim 7, is characterized in that, described noise floor calculation submodule comprises: A conjugate multiplication value calculation unit, configured to calculate a conjugate multiplication value corresponding to each group of channel estimation values according to each group of channel estimation values of the receiving antennas; The first calculation unit is used to calculate the absolute value of the average value of all conjugate multiplication values according to each of the conjugate multiplication values; The pilot symbol power value calculation unit is used to calculate the power value of each pilot symbol according to the channel estimation value of each OFDM pilot symbol on the signal bandwidth of each receiving antenna; A second calculation unit, configured to calculate the average value of the power values of all pilot symbols according to the power value of each pilot symbol; The receiving antenna noise power value calculation unit is used to calculate the absolute value of the difference between the absolute value of the mean value of all conjugate multiplication values and the mean value of the power values of all pilot symbols, and the difference value The absolute value is the noise power value of the receiving antenna; The receiving antenna noise floor calculation unit is configured to calculate the arithmetic square root of the noise power value of the receiving antenna according to the noise power value of the receiving antenna, and the arithmetic square root is the noise floor of the receiving antenna. 9. The device for parsing spatial-frequency block codes according to any one of claims 6-8, wherein the frequency-domain signal conversion module is also used for: Dividing the received signal in the frequency domain of each receiving antenna by the noise floor of the receiving antenna to obtain the received signal in the frequency domain transformed by each antenna. 10. the device of analyzing space-frequency block code as claimed in claim 9, is characterized in that, described space-frequency block code decoding module is also used for: performing space-frequency block code decoding according to the transformed frequency-domain received signal of each receiving antenna, and determining an estimated value of the transmitted signal of the transmitting antenna corresponding to each receiving antenna.