CN102387104B - Signal method of sending and receiving in wireless communication system and device - Google Patents

Abstract

The invention discloses a signal sending and receiving method and device in a wireless communication system. The signal sending method in the wireless communication system according to the present invention includes: receiving an original data block to be sent, the length of the original data block is M, where M is an integer; performing one or more scrambles on the original data block, so that in each of the one or more disturbances, the M data symbols in the original data block are rearranged, thereby obtaining one or more out-of-sequence data blocks with a length of M; using a cyclic prefix connection The original data block and the one or more out-of-sequence data blocks are used to form a time-frequency domain interleaved equalized signal with frequency domain diversity; and sending the equalized signal with frequency domain diversity through a single carrier.

Description

Signal sending and receiving method and device in wireless communication system

technical field

The present invention relates to the technical field of wireless communication, in particular to a signal sending and receiving method and device in a wireless communication system.

Background technique

Equalization techniques can generally be divided into two categories: linear equalization and nonlinear equalization. The linear equalizer is relatively simple, and can eliminate the channel influence well when the channel fading is not serious. Commonly used algorithms include the zero-forcing (ZF) algorithm and the minimum mean square error (MMSE) algorithm. When the multipath fading of the wireless channel is severe, there will be deep zeros in the frequency domain response of the channel. In order to compensate for the amplitude fading near the zero point, the linear equalizer must amplify the frequency spectrum, which also enhances the noise in this frequency band (especially the ZF equalizer) and reduces the signal-to-noise ratio of the system. However, a nonlinear equalizer will have a better effect in such a bad channel, and a decision feedback equalizer (DFE) is a common type of nonlinear equalizer.

Multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) is a modulation method for frequency-selective channels. It uses K equally spaced subcarriers, each subcarrier is modulated individually, and the symbol period is the same as that of a single-carrier system at the same rate. K times, it can effectively fight against multipath interference. At the same time, the OFDM system inserts guard intervals between symbols to eliminate cross-symbol interference. The modulation and demodulation of OFDM signals can be realized by using IFFT and FFT. Because some sub-channels will also face deep fading and produce high bit error rate, which will cause a bit error platform in the OFDM system. Generally, strong error correction codes are used to correct errors. However, long channel error correction codes will cause a large system processing delay. Therefore, diversity in the frequency domain is also used to improve the channel. That is, the same information symbol is sent on different subcarriers. When the fading of each subcarrier is independent, the diversity gain can be obtained, and the high bit error rate of data on the subcarriers caused by deep fading can be avoided.

Linear equalizers using non-ZF algorithms, such as MMSE equalizers, will reduce the noise amplification of frequency domain zeros. However, it will bring about the problem of residual cross-symbol interference of the equalizer, and the residual cross-symbol interference will significantly reduce the performance of the modulation system, resulting in a plateau of the bit error rate. The nonlinear equalizer DFE has higher processing complexity when the data rate is higher, and also has problems of stability and decision error propagation. Therefore, linear or nonlinear equalizers have some disadvantages, especially when the channel is relatively bad, the channel delay is relatively long, resulting in greater cross-symbol interference and more frequency domain zeros, MMSE equalizer and DFE equalizer performance will be poor.

The diversity technology of OFDM can improve the channel response, which is different from the channel equalization method. Whether it is linear or nonlinear equalization, it is to adapt to relatively poor channel conditions, but relatively serious channel cross-symbol interference has already formed at this time, and it is too late to correct it by the equalizer alone. However, the hardware structure of OFDM is very complicated, and the energy consumption is also high. Since the signal is split into multiple subcarriers, when the symbols of all subcarrier signals are the same, there will be a problem of signal amplitude superposition, which is called the peak-to-average power ratio problem (PAPR). The peak-to-average power ratio problem increases the transmission energy consumption by several dB, and also puts forward higher requirements on the automatic level control (AGC) control and the linearity of the high-frequency part of the circuit. Therefore, the complexity, power consumption and cost of OFDM are relatively high.

Contents of the invention

A brief overview of the invention is given below in order to provide a basic understanding of some aspects of the invention. It should be understood, however, that this summary is not an exhaustive summary of the invention. It is not intended to identify key or critical parts of the invention, nor to limit the scope of the invention. Its sole purpose is to present some concepts of the invention in a simplified form as a prelude to the more detailed description that is presented later.

The present invention proposes a time-frequency domain interleaved frequency domain diversity linear equalization processing (TFI-FD-LE) technology. By rearranging the data sequence of the original data blocks at the sending end, and then performing the frequency-domain maximum ratio combination at the receiving end, the same subcarrier frequency-domain diversity gain as the OFDM frequency division system can be obtained, and the channel depth can be significantly improved under long-delay channels. state of decline.

The frequency domain diversity gain of the TFI-FD-LE technology according to the present invention requires that the coherent bandwidth of the channel be much smaller than the transmission frequency band of the communication system. Generally speaking, the indoor RMS delay is 50 ns, corresponding to a coherent bandwidth of 3 MHz; the RMS delay outdoors is 30 us, corresponding to a coherent bandwidth of 5 KHz. And many channels, such as ultra-wideband indoor channels, occupy a bandwidth of 500MHz; outdoor wireless cellular 3GPP LTE has a bandwidth of up to 20MHz, which is much higher than the corresponding coherent bandwidth. Therefore, the scope of application of the present invention is very wide.

The TFI-FD-LE technique according to the present invention utilizes the inherent diversity property in frequency selective channels to accomplish this time-frequency interleaving. Therefore, the TFI-FD-LE technology according to the present invention does not require additional RF front-end, multi-antenna, and relay operations between individual terminals required to utilize multi-antenna diversity as described in the background art. In this way, the power consumption and the size of the terminal according to the TFI-FD-LE technology of the present invention are reduced.

According to one aspect of the present invention, a signal transmission method in a wireless communication system is provided, which includes the following steps: receiving an original data block to be transmitted, the length of the original data block is M, wherein M is an integer; The original data block is scrambled one or more times, so that in each of the one or more scramblings, the M data symbols in the original data block are rearranged, thereby obtaining one or more symbols of length Out-of-sequence data blocks of M; using a cyclic prefix to connect the original data block and the one or more out-of-order data blocks to form a frequency-domain diversity equalization signal interleaved in the time-frequency domain; and sending the frequency domain through a single carrier Diversity equalized signal.

According to another aspect of the present invention, there is also provided a signal receiving method in a wireless communication system, which includes the following steps: obtaining a frequency-domain diversity equalized signal interleaved in the time-frequency domain, the frequency-domain diversity equalized signal including using a cyclic prefix the concatenated original data block and one or more out-of-order data blocks; removing the cyclic prefix to obtain the original data block and the one or more out-of-order data blocks; and the original data block and the One or more out-of-sequence data blocks are combined in time domain to obtain a frequency domain diversity combined signal.

According to another aspect of the present invention, there is also provided a signal sending device in a wireless communication system, which includes: an original data block receiving unit, configured to receive an original data block to be sent, and the length of the original data block is M , where M is an integer; a scrambling unit, configured to perform one or more scrambles on the original data block received by the original data block receiving unit, so that in each of the one or more scrambles, The M data symbols in the original data block are rearranged to obtain one or more out-of-sequence data blocks with a length of M; a connection unit, configured to use a cyclic prefix to connect all the original data blocks received by the receiving unit The original data block and the one or more scrambled data blocks scrambled by the scrambling unit to form a frequency-domain diversity equalization signal interleaved in the time-frequency domain; and a sending unit for sending the connection unit through a single carrier The formed equalized signal with frequency domain diversity.

According to another aspect of the present invention, there is also provided a signal receiving device in a wireless communication system, which includes: a frequency-domain diversity equalization signal obtaining unit, configured to obtain a frequency-domain diversity equalization signal interleaved in the time-frequency domain, the frequency domain The domain diversity equalization signal includes an original data block connected by using a cyclic prefix and one or more out-of-sequence data blocks; a signal prefix removal unit is configured to remove the cyclic prefix to obtain the original data block and the one or more an out-of-sequence data block; and a merging unit, configured to perform time-domain signal combination on the original data block and the one or more out-of-order data blocks obtained by the signal prefix removal unit, to obtain a frequency-domain diversity combined signal .

Compared with the subcarrier frequency diversity mode of OFDM, the TFI-FD-LE technology according to the present invention has no peak-to-average ratio problem. The single carrier modulation of the TFI-FD-LE technology according to the present invention greatly reduces the linearity requirement of OFDM radio frequency devices. Equipment cost and hardware complexity are reduced. And compared with the OFDM method, it significantly reduces the power consumption of the radio frequency part of the wireless communication (no power backoff of several dB), and is especially suitable for battery-powered handheld ultra-wideband wireless devices. Therefore, it is widely used.

The TFI-FD-LE technology according to the present invention performs interleaving in the time domain and maximum ratio combination of frequency domain sub-channels at the receiving end. In the broadband wireless communication transmission with deep fading, the channel will be greatly improved, and the performance of the linear equalizer at the receiving end will be improved. And because this TFI-FD-LE diversity method does not require multi-radio frequency front-end circuits for multi-antenna diversity. In this way, the power consumption of the TFI-FD-LE system and the volume of the terminal can be reduced.

According to the technical scheme of the present invention, there are no complexity and stability problems of nonlinear time-domain equalizers. Linear equalization is an FIR system, so the TFI-FD-LE system according to the present invention is relatively stable and reliable.

Description of drawings

The present invention can be better understood by referring to the following detailed description given in conjunction with the accompanying drawings, wherein the same or similar reference numerals are used throughout to designate the same or similar parts. The accompanying drawings, together with the following detailed description, are incorporated in and form a part of this specification, and serve to further illustrate preferred embodiments of the invention and explain the principles and advantages of the invention. In the attached picture:

FIG. 1 is a flow chart showing a signal transmission method in a wireless communication system according to an embodiment of the present invention;

Fig. 2 is a schematic diagram showing that the TFI-FD-LE sending end repeatedly sends data blocks out of sequence according to an embodiment of the present invention;

FIG. 3 is a flowchart showing a signal receiving method in a wireless communication system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram showing a demodulation algorithm of TFI-FD-LE at the receiving end according to an embodiment of the present invention;

5 is a block diagram illustrating a signal transmitting device in a wireless communication system according to an embodiment of the present invention; and

FIG. 6 is a block diagram showing a signal receiving device in a wireless communication system according to an embodiment of the present invention.

It will be appreciated by those skilled in the art that elements in the figures are illustrated for simplicity and clarity only and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of the embodiments of the present invention.

detailed description

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Moreover, it should also be understood that development work, while potentially complex and time-consuming, would at least be a routine undertaking for those skilled in the art having the benefit of this disclosure.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and the Other details not relevant to the present invention are described.

A signal sending method in a wireless communication system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a flowchart illustrating a signal transmission method in a wireless communication system according to an embodiment of the present invention.

First, in step S110, the original data block to be sent is received.

Here, it is assumed that the length of the original data block is M, where M is an integer.

Next, in step S120, the original data block is scrambled one or more times to obtain one or more out-of-sequence data blocks.

According to the invention, in each of one or more perturbations, the M data symbols in the original data block are rearranged. The obtained one or more out-of-sequence data blocks all have a length M.

Next, in step S130, the original data block and one or more out-of-sequence data blocks are connected using a cyclic prefix to form a time-frequency domain interleaved equalized signal with frequency domain diversity.

Finally, in step S140, the frequency-domain diversity equalized signal is sent through a single carrier.

According to the present invention, TFI-FD-LE performs data rearrangement and transmission on SC-FDE data blocks at the originating end, and every time a data rearrangement data block is repeatedly sent, in the frequency domain, it is equivalent to adding a diversity branch, that is, more An antenna branch of an antenna system or a subcarrier of an OFDM frequency division system. If the fading between equivalent sub-channels in random random order is independent, then the diversity gain under maximum ratio (MRC) combining is maximum.

According to a preferred embodiment of the present invention, the frequency domain diversity equalized signal is transmitted on a quasi-static channel through a single carrier.

According to a preferred embodiment of the present invention, the number of times to scramble the original data block is determined based on the minimum transmission rate requirement in the wireless communication system and the state of the channel that transmits the frequency domain diversity equalization signal.

In order to more specifically describe the signal sending method in the wireless communication system according to the embodiment of the present invention, it will be described below with reference to FIG. 2 .

Fig. 2 is a schematic diagram showing that the TFI-FD-LE sender repeatedly sends out-of-sequence data blocks according to an embodiment of the present invention.

TFI-FD-LE with time-frequency domain interleaving adopts the same block transmission method as frequency domain equalizer (FDE) to cope with frequency selective channels, which can convert linear convolution to circular convolution. The length of the cyclic prefix (CP) is N, and the length of the CP exceeds the length of channel delay propagation. It copies the rear part of each data block and connects it to the front of each data block. Then, by removing the CP, the multipath interference across data blocks is eliminated at the receiving end. Considering the possibility of interleaving in the frequency domain, the following transmission block structure of time-frequency domain interleaving is designed at the sending end. In the time domain, each data block of TFI-FD-LE is transmitted twice. The order of data in the first data block is the same as the original data. The data sequence in the second data block is to scramble the original data, as shown in FIG. 2 . Let the m-th symbol of the k-th transmission block be s ^k (m). At time k=0, 2, 4,..., each pair of blocks s ^k (m) and s ^k+1 (m) of length M is generated by the same original data block, and its arrangement is defined as follows:

${\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; random</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; for\; m</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0,1</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}$

above Represents random random serial numbers; here s ^k (m) is the original data block with the same data order; s ^k+1 (m) is the random arrangement of the data serial numbers in s ^k (m). and It is necessary to ensure that the serial numbers of the data symbols are not repeated. Through the interleaving operation, the frequency-domain zero points of the frequency-selective channel can be compensated when performing the corresponding FDE equalization, which also avoids a large increase of noise energy at these zero points.

The above method can be analogized to rearrange more data block sequences to improve frequency domain diversity gain. If the same data block is transmitted three times, the data blocks transmitted for the first time and the second time are the same as the previous definition, and the reordered data blocks for the third retransmission are defined as s ^k+2 (m), and the data arrangement The sequence is expressed as follows:

${\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}^{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; random</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; for\; m</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0,1</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}$

here Represents the random sequence number of s ^k (m). The above method can be analogized to s ^k+3 (m), s ^k+4 (m) and so on. At the same time, the above data block rearrangement can also be represented by the following permutation matrix:

s ^{k +1} = Ask

Here A is an M×M equivalent s ^k permutation matrix. At the same time, the permutation matrix A has been predicted at the receiving end, which is convenient for signal equalization and demodulation. Rearranging and sending each data block will lead to a decrease in spectrum utilization, which will reduce the data rate of the overall transmission system, but will also increase the power of the transmitted signal and increase the diversity gain of the frequency domain sub-band. According to the minimum transmission rate requirements of the system and the quality of the channel, the number of data block retransmissions can be adjusted to achieve the best compromise between signal transmission performance and spectrum utilization.

A signal receiving method in a wireless communication system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 3 is a flowchart illustrating a signal receiving method in a wireless communication system according to an embodiment of the present invention.

First, in step S310, a frequency-domain diversity equalized signal interleaved in the time-frequency domain is obtained, and the frequency-domain diversity equalized signal includes original data blocks connected by using a cyclic prefix and one or more out-of-sequence data blocks.

The time-frequency domain interleaved frequency-domain diversity equalized signal obtained in step S310 may be the frequency-domain diversity equalized signal transmitted through the above-mentioned signal transmission method in the wireless communication system according to the embodiment of the present invention.

Next, in step S320, the cyclic prefix is removed to obtain the original data block and one or more out-of-sequence data blocks.

Finally, in step S330, time-domain signal combination is performed on the original data block and one or more out-of-sequence data blocks to obtain a frequency-domain diversity combination signal.

According to the present invention, TFI-FD-LE adopts linear combination at the receiving end to obtain frequency-domain diversity gain. The linear combination is performed in the time domain, but it is equivalent to the combination in the frequency domain. Higher complexity of frequency division systems and multi-antenna systems due to domain combining and frequency domain diversity. Therefore, this system does not need multiple antennas, nor OFDM frequency division system, or other complex frequency division diversity, such as diversity in frequency hopping mode.

According to a preferred embodiment of the present invention, obtaining the frequency-domain diversity equalization signal interleaved in the time-frequency domain can be achieved by the following: receiving a wireless signal containing the information of the frequency-domain diversity equalization signal through a radio frequency front end; and through an analog-to-digital converter and a digital filter The wireless signal is processed to obtain a frequency domain diversity equalized signal.

According to a preferred embodiment of the invention, the time domain signal combining is maximum ratio combining.

According to a preferred embodiment of the present invention, the signal receiving method further includes the following steps: performing linear equalization on the frequency-domain diversity combined signal through the minimum mean square error algorithm; performing symbol judgment or channel decoding on the frequency-domain diversity combined signal after linear equalization, obtaining a result data block corresponding to the original data block; and outputting the result data block as a receiving result of the original data block.

A signal receiving method in a wireless communication system according to an embodiment of the present invention can be better understood with reference to FIG. 4 .

Fig. 4 is a schematic diagram showing a demodulation algorithm of TFI-FD-LE at the receiving end according to an embodiment of the present invention.

At the receiving end, a receiving algorithm as shown in Figure 4 is adopted. Although signal combining in the time domain is used at this time, it is equivalent to diversity combining in the frequency domain. Using maximum ratio (MRC) diversity combination, the optimal diversity order of MRC combination can be obtained. In this way, accessories such as multi-radio frequency and multi-ADC conversion of the multi-antenna system are avoided at the receiving end, which can reduce the complexity and power consumption of the transmission system, and reduce the system cost.

In order to facilitate the understanding of the present invention, an example of the demodulation algorithm at the receiving end when the number of repeatedly transmitted data blocks is 2 is given below. This corresponds to the case when the number of diversity branches is 2. When the number of reordered data blocks sent repeatedly exceeds 2, the processing flow is consistent with the following, so the example with 2 branches can be used as a general algorithm for reference.

After sampling by the ADC and removing the CP in the time domain, on a TFI-FD-LE transceiver with only one transmit and receive antenna, the data block k and block k+1 at the receiving end can be regarded as a vector and can be expressed as the following:

$\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; =</span>\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>}\\ {\mathrm{<span\; class="notranslate">\; the\; y</span>}}^{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}\end{array}\right]$

$<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; no</span>}$

$<span\; class="notranslate">\; =</span>\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; +</span>\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]$

Here, H ₁ is an M×M cyclic channel matrix; and H ₂ =H ₁ A is a channel matrix with rearranged columns of H ₁ . H ₀ is a 2M×M composite channel matrix including H ₁ and H ₂ . Furthermore, it is assumed that the channel impulse response (CIR) is statically constant for every two consecutive data blocks. Based on the matrix operation and the above assumptions, the following formula is obtained:

${\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; [</span>{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}^{\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; ]</span>\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right]$

$<span\; class="notranslate">\; =</span><span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\mathrm{<span\; class="notranslate">\; A</span>}<span\; class="notranslate">\; ]</span>$

Here (·) ^H represents a renaturation transpose conjugate operation; It is also a circular matrix, which can be decomposed by eigenvalues. Record the result of its eigenvalue decomposition as |Λ ₁ | ² , which is the frequency domain response of the channel (here Λ ₁ is a M×M diagonal matrix). According to the permutation matrix properties of A, this is a permutation matrix of matrix eigenvalues, which has eigenvalue |Λ ₂ | ² as eigenvalue The nature of the out-of-order arrangement, which means that the original deep fading frequency domain sub-channel is compensated by other irrelevant frequency domain sub-channels, and the final The decomposition result of the eigenvalue of is |Λ ₀ (i, i)| ² = |Λ ₁ (i, i)| ² +|Λ ₂ (i, i)| ² , that is, |Λ ₀ | ² is a diagonal The matrix is a set of frequency-domain transform components of the composite channel impulse response. The diversity combination process here is equivalent to a frequency-domain maximum ratio (MRC) diversity combination. Therefore, the TFI-FD-LE with 2 diversity branches obtains 2nd-order frequency diversity.

Therefore, the signal processing of the TFI-FD-LE receiving end summarized above is: the output of the minimum mean square error (MMSE) equalization estimate It can be expressed in the time domain as the following matrix form:

$\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; SNR</span>}}<span\; class="notranslate">\; )</span>}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; h</span>}}\mathrm{<span\; class="notranslate">\; the\; y</span>}$

$<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; SNR</span>}}<span\; class="notranslate">\; )</span>}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}^{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\mathrm{<span\; class="notranslate">\; the\; s</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; no</span>}}^{<span\; class="notranslate">\; ,</span>}$

I _M here is a unit diagonal matrix of M×M; SNR is the signal-to-noise ratio of the signal received by the receiver. As shown in Figure 4, the MMSE equalization estimate output can then be Perform symbol decision or channel decoding and soft decision.

A signal sending device in a wireless communication system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 5 is a block diagram showing a signal transmitting device 500 in a wireless communication system according to an embodiment of the present invention.

As shown in FIG. 5 , a signal sending device 500 according to an embodiment of the present invention includes an original data block receiving unit 510 , a scrambling unit 520 , a connecting unit 530 and a sending unit 540 .

The original data block receiving unit 510 is configured to receive the original data block to be sent, the length of the original data block is M, where M is an integer.

The scrambling unit 520 is configured to perform one or more scrambles on the original data block received by the original data block receiving unit 510, so that in each of the one or more scrambles, the M data symbols in the original data block are rearranged to obtain one or more out-of-order data blocks of length M.

The connection unit 530 is configured to use a cyclic prefix to connect the original data block received by the original data block receiving unit 510 and one or more out-of-sequence data blocks scrambled by the scrambling unit 520 to form a time-frequency domain interleaved frequency domain diversity equalized signal.

The sending unit 540 is configured to send the frequency domain diversity equalized signal formed by the connecting unit 530 through a single carrier.

According to an embodiment of the present invention, the sending unit 540 sends the frequency domain diversity equalized signal formed by the connecting unit 530 on a quasi-static channel through a single carrier.

According to an embodiment of the present invention, the scrambling unit 520 determines the number of times to scramble the original data block based on the requirement of the minimum transmission rate in the wireless communication system and the state of the channel that transmits the frequency domain diversity equalization signal.

Various specific implementations of the above units in the signal sending device 500 have been described in detail above, and will not be repeated here.

A signal receiving device in a wireless communication system according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 6 is a block diagram showing a signal receiving device 600 in a wireless communication system according to an embodiment of the present invention.

As shown in FIG. 6 , a signal receiving apparatus 600 according to an embodiment of the present invention includes a frequency domain diversity equalized signal obtaining unit 610 , a signal prefix removing unit 620 and a combining unit 630 .

The frequency domain diversity equalized signal obtaining unit 610 is configured to obtain a time frequency domain interleaved frequency domain diversity equalized signal, the frequency domain diversity equalized signal includes original data blocks connected by using a cyclic prefix and one or more out-of-sequence data blocks.

The signal prefix removal unit 620 is used to remove the cyclic prefix to obtain the original data block and one or more out-of-sequence data blocks.

The merging unit 630 is configured to perform time-domain signal merging on the original data block obtained through the signal prefix removing unit 620 and one or more out-of-sequence data blocks, so as to obtain a frequency-domain diversity merging signal.

According to an embodiment of the present invention, the frequency domain diversity equalization signal obtaining unit 610 may include: a radio frequency front end (not shown), for receiving a wireless signal containing information of the frequency domain diversity equalization signal; and an analog-to-digital converter and a digital filter (not shown), configured to process the wireless signal received through the radio frequency front end, so as to obtain a frequency domain diversity equalized signal.

According to an embodiment of the present invention, the time-domain signal combining performed by the combining unit 630 is maximum ratio combining.

According to an embodiment of the present invention, the signal receiving device 600 may further include: an equalization unit (not shown), which is used to perform linear equalization on the frequency-domain diversity combined signal obtained by the combining unit 630 through the minimum mean square error algorithm; symbol decision/ A channel decoding unit (not shown), which is used to perform symbol decision or channel decoding on the frequency-domain diversity combined signal linearly equalized by the equalization unit, so as to obtain a result data block corresponding to the original data block; and an output unit (not shown output), for outputting the result data block obtained by the symbol decision/channel decoding unit as the receiving result of the original data block.

Various specific implementations of the above units in the signal receiving device 600 have been described in detail above, and will not be repeated here.

In the device and method of the present invention, obviously, each component or each step can be decomposed and/or reassembled. These decompositions and/or recombinations should be considered equivalents of the present invention. Also, the steps for performing the above series of processes may naturally be performed in chronological order in the order described, but need not necessarily be performed in chronological order. Certain steps may be performed in parallel or independently of each other.

Although the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, it should be understood that the above-described embodiments are only used to illustrate the present invention, rather than to limit the present invention. Various modifications and changes can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, the scope of the present invention is limited only by the appended claims and their equivalents.

Claims (14)

1. the signaling method in wireless communication system, including:

The original data block that reception will send, a length of M of described original data block, wherein M For integer；

Diversity performance in frequency-selective channel based on described wireless communication system, to described original Data block carries out one or many upset so that the upset each time in described one or many is upset In, M data symbol in described original data block is rearranged, thus obtains one or many The out of order data block of individual a length of M；

Cyclic Prefix is used to connect described original data block and the one or more out of order data block, with Form the frequency diversity equalizing signal that time-frequency domain interweaves；And

Described frequency diversity equalizing signal is sent by single carrier.

Method the most according to claim 1, wherein, is believed in quasistatic by described single carrier Described frequency diversity equalizing signal is sent on road.

Method the most according to claim 1, wherein, based in described wireless communication system The state of the channel of the requirement of minimum transfer rate and the described frequency diversity equalizing signal of transmission, determines The number of times that described original data block is upset.

4. the signal acceptance method in wireless communication system, including:

Obtaining the frequency diversity equalizing signal that time-frequency domain interweaves, described frequency diversity equalizing signal includes making The original data block connected with Cyclic Prefix and one or more out of order data block, wherein, one Or multiple out of order data block is by frequency-selective channel based on described wireless communication system Diversity performance carries out what one or many upset obtained to described original data block；

Remove described Cyclic Prefix, to obtain described original data block and the one or more out of order number According to block；And

Described original data block and the one or more out of order data block are carried out time-domain signal merging, To obtain frequency diversity merging signal.

Method the most according to claim 4, wherein, it is thus achieved that the frequency diversity that time-frequency domain interweaves Equalizing signal is achieved in that

The wireless signal of the information comprising described frequency diversity equalizing signal is received by radio-frequency front-end；With And

By analog-digital converter and digital filter, described wireless signal is processed, described to obtain Frequency diversity equalizing signal.

Method the most according to claim 4, wherein, it is high specific that described time-domain signal merges Merge.

Method the most according to claim 4, farther includes:

By least-mean-square error algorithm, described frequency diversity is merged signal and carry out linear equalization；

Described frequency diversity after linear equalization is merged signal and carries out symbol judgement or channel-decoding, with Obtain the result data block corresponding with described original data block；And

Export the described result data block reception result as described original data block.

8. the sender unit in wireless communication system, including:

Original data block receives unit, for receiving the original data block that will send, described original number According to a length of M of block, wherein M is integer；

Upsetting unit, the diversity in frequency-selective channel based on described wireless communication system is special Property described original data block received the described original data block that received of unit carry out one or many Upset so that in the upset each time in described one or many is upset, in described original data block M data symbol be rearranged, thus obtain the out of order data of one or more a length of M Block；

Connect unit, receive what unit was received for using Cyclic Prefix to connect described original data block The one or more out of order data block that described original data block and described upset unit are upset, with Form the frequency diversity equalizing signal that time-frequency domain interweaves；And

Transmitting element, for sending, by single carrier, the described frequency diversity that described connection unit is formed Equalizing signal.

Device the most according to claim 8, wherein, described transmitting element is by described single load Ripple sends the described frequency diversity equalizing signal that described connection unit is formed on quasistatic channel.

Device the most according to claim 8, wherein, based in described wireless communication system The requirement of minimum transfer rate and send the state of channel of described frequency diversity equalizing signal, described in disturb Random unit determines the number of times upsetting described original data block.

Signal receiving device in 11. 1 kinds of wireless communication systems, including:

Frequency diversity equalizing signal obtains unit, for obtaining the frequency diversity equilibrium letter that time-frequency domain interweaves Number, described frequency diversity equalizing signal include use Cyclic Prefix connect original data block and one or Multiple out of order data blocks, wherein, the one or more out of order data block is by based on described wireless Diversity performance in the frequency-selective channel of communication system described original data block is carried out once or Repeatedly upset obtains；

Signal prefix removal unit, is used for removing described Cyclic Prefix, to obtain described original data block With the one or more out of order data block；And

Combining unit, for the described original data block obtained by described signal prefix removal unit Time-domain signal merging is carried out, to obtain frequency diversity merging letter with the one or more out of order data block Number.

12. devices according to claim 11, wherein, described frequency diversity equalizing signal obtains Obtain unit to include:

Radio-frequency front-end, for receiving the wireless signal of the information comprising described frequency diversity equalizing signal； And

Analog-digital converter and digital filter, for described wireless to received by described radio-frequency front-end Signal processes, to obtain described frequency diversity equalizing signal.

13. devices according to claim 11, wherein, it is described that described combining unit is carried out It is maximum-ratio combing that time-domain signal merges.

14. devices according to claim 11, farther include:

Balanced unit, for by the least-mean-square error algorithm institute to being obtained by described combining unit State frequency diversity merging signal and carry out linear equalization；

Symbol judgement/channel decoding unit, for by the institute after described balanced unit linear equalization State frequency diversity merging signal and carry out symbol judgement or channel-decoding, to obtain and described original data block Corresponding result data block；And

Output unit, the described knot obtained by described symbol judgement/channel decoding unit for output Really data block is as the reception result of described original data block.