JP6869449B1 - Transmission line equalization processing device and transmission line equalization processing method - Google Patents

Abstract

Suppresses deterioration of the accuracy of transmission line equalization processing. The transmission line equalization processing apparatus includes a transmission line estimation unit that calculates a first inverse modulation transmission line estimation value, a first interpolation transmission line estimation value, and a second interpolation transmission line estimation value, and a first of each. A noise estimation unit that estimates noise power based on the difference between the inversely modulated transmission line estimation value and the corresponding first interpolation transmission line estimation value, the noise power, and the resource element corresponding to the payload signal of the signal. It is provided with an MMSE equalization unit that performs equalization processing of the MMSE standard based on the second interpolated transmission line estimated value.

Description

The technique disclosed in the present specification relates to a transmission line equalization processing apparatus and a transmission line equalization processing method.

In a receiving device that performs wireless communication, minimum mean square error (minimum mean square error, that is, MMSE) equalization is known as one of the techniques for compensating for distortion of a transmission line.

In MMSE equalization, it is necessary to estimate the noise level in order to suppress noise, and there are the following methods as conventional estimation methods.

First, a received signal component including a known reference signal is extracted from the received signal in the frequency domain, and multiplication with a separately generated reference signal is performed.

Then, after adding virtual subcarrier components to both ends of the output sample, the signal is converted into a signal in the time domain.

In order to obtain good channel estimation accuracy over the entire band, it is necessary to smoothly expand both ends of the output sample. This is a necessary process for improving the channel estimation accuracy.

The noise level is estimated from a sample outside the channel response window of the time domain signals thus obtained (see, for example, Patent Document 1).

Japanese Patent No. 5353304

In the conventional technique, the noise level (mainly thermal noise power) is estimated by measuring the power at a place where no signal is output in the time domain.

However, when the signal is received with a power sufficiently larger than the thermal noise power, the error power other than the thermal noise power (for example, the transmission line estimation error power) is dominant in the noise level as compared with the thermal noise power. Become.

Therefore, when the noise level estimated by the conventional technique is used for MMSE equalization in the above case, the noise level between the estimated noise level and the actual noise level including the error power other than the thermal noise power is obtained. Due to inconsistency, noise enhancement may not be suppressed. Then, there is a problem that the accuracy of the transmission line equalization process deteriorates.

The technique disclosed in the present specification has been made in view of the problems described above, and even when a signal is received with a power sufficiently larger than the thermal noise power, a transmission line or the like is used. This is a technology for suppressing deterioration of the accuracy of chemical processing.

A first aspect of the technique disclosed herein is to calculate a corresponding first inversely modulated transmission line estimate from a plurality of resource elements corresponding to a pilot signal of an input signal, and the plurality of said first. The first interpolated transmission line estimated value is calculated based on the inversely modulated transmission line estimated value of 1, and corresponds to the input payload signal of the signal based on the plurality of the first inversely modulated transmission line estimated values. Difference between the transmission line estimation unit that calculates the second interpolated transmission line estimated value in the plurality of resource elements and the first interpolated transmission line estimated value corresponding to each of the first inversely modulated transmission line estimated values. Based on the noise estimation unit that estimates the noise power, the noise power, at least one resource element corresponding to the payload signal of the signal, and the second interpolated transmission line estimated value. It is equipped with an MMSE equalization unit that performs equalization processing of MMSE standards.

A second aspect of the technique disclosed herein is to calculate the corresponding first inversely modulated transmission line estimates from a plurality of resource elements corresponding to the pilot signal of the input signal and to obtain the plurality of said first. The first interpolated transmission line estimated value is calculated based on the reverse modulation transmission line estimated value of 1, and corresponds to the input payload signal of the signal based on the plurality of the first reverse modulation transmission line estimated values. Second interpolated transmission line estimates for the plurality of resource elements are calculated, and noise is obtained based on the difference between the first inversely modulated transmission line estimated value and the corresponding first interpolated transmission line estimated value. The power is estimated, and the equalization processing of the MMSE standard is performed based on the noise power, at least one resource element corresponding to the payload signal of the signal, and the second interpolated transmission line estimated value.

A first aspect of the technique disclosed herein is to calculate a corresponding first inversely modulated transmission line estimate from a plurality of resource elements corresponding to a pilot signal of an input signal, and the plurality of said first. The first interpolated transmission line estimated value is calculated based on the inversely modulated transmission line estimated value of 1, and corresponds to the input payload signal of the signal based on the plurality of the first inversely modulated transmission line estimated values. Difference between the transmission line estimation unit that calculates the second interpolated transmission line estimated value in the plurality of resource elements and the first interpolated transmission line estimated value corresponding to each of the first inversely modulated transmission line estimated values. Based on the noise estimation unit that estimates the noise power, the noise power, at least one resource element corresponding to the payload signal of the signal, and the second interpolated transmission line estimated value. It is equipped with an MMSE equalization unit that performs equalization processing of MMSE standards. According to such a configuration, the signal is received with a power sufficiently larger than the thermal noise power by performing the equalization processing based on the noise power corresponding to the sum of the thermal noise power and the transmission line estimation error power. Even in this case (that is, regardless of the magnitude of the power of the input signal), deterioration of the accuracy of the transmission line equalization process can be suppressed.

A second aspect of the technique disclosed herein is to calculate the corresponding first inversely modulated transmission line estimates from a plurality of resource elements corresponding to the pilot signal of the input signal and to obtain the plurality of said first. The first interpolated transmission line estimated value is calculated based on the reverse modulation transmission line estimated value of 1, and corresponds to the input payload signal of the signal based on the plurality of the first reverse modulation transmission line estimated values. Second interpolated transmission line estimates for the plurality of resource elements are calculated, and noise is obtained based on the difference between the first inversely modulated transmission line estimated value and the corresponding first interpolated transmission line estimated value. The power is estimated, and the equalization processing of the MMSE standard is performed based on the noise power, at least one resource element corresponding to the payload signal of the signal, and the second interpolated transmission line estimated value. According to such a configuration, the signal is received with a power sufficiently larger than the thermal noise power by performing the equalization processing based on the noise power corresponding to the sum of the thermal noise power and the transmission line estimation error power. Even in this case, deterioration of the accuracy of the transmission line equalization process can be suppressed.

Also, the objectives, features, aspects and advantages associated with the art disclosed herein will be further clarified by the detailed description and accompanying drawings set forth below.

It is a figure which shows the example of the structure of the communication system including the receiver which carries the transmission line equalization processing apparatus which concerns on embodiment. It is a figure which shows the example of the configuration of the receiver which mounts the transmission line equalization processing apparatus which concerns on embodiment. It is a figure which shows the example of the structure in the transmission line equalization part as a transmission line equalization processing apparatus in detail. It is a figure which shows the outline of the operation of a noise estimation part. It is a figure which shows the example of the structure in the transmission line equalization part as a transmission line equalization processing apparatus in detail.

Hereinafter, embodiments will be described with reference to the attached drawings. In the following embodiments, detailed features and the like are also shown for the purpose of explaining the technique, but they are examples, and not all of them are necessarily essential features in order for the embodiments to be feasible.

It should be noted that the drawings are shown schematically, and for convenience of explanation, the configurations are omitted or the configurations are simplified in the drawings as appropriate. Further, the interrelationship between the sizes and positions of the configurations and the like shown in different drawings is not always accurately described and can be changed as appropriate. Further, even in a drawing such as a plan view which is not a cross-sectional view, hatching may be added to facilitate understanding of the contents of the embodiment.

Further, in the description shown below, similar components are illustrated with the same reference numerals, and their names and functions are also the same. Therefore, detailed description of them may be omitted to avoid duplication.

Further, in the description described below, when it is described that a certain component is "equipped", "included", or "has", the existence of another component is excluded unless otherwise specified. Not an expression.

Also, even if ordinal numbers such as "first" or "second" are used in the description described below, these terms make it easy to understand the content of the embodiments. It is used for convenience, and is not limited to the order that can be generated by these ordinal numbers.

<First Embodiment>
Hereinafter, a transmission line equalization processing apparatus and a transmission line equalization processing method according to the present embodiment will be described.

<Communication system configuration>
FIG. 1 is a diagram showing an example of a configuration of a communication system including a receiver equipped with a transmission line equalization processing device according to the present embodiment.

As an example is shown in FIG. 1, the communication system 100 includes a multiplexing unit 101, a transmitter 102, a receiver 103, and a multiplexing unit 104.

The multiplexing unit 101 has, for example, a circuit structure and multiplexes signals input from various devices and the like. Then, the multiplexing unit 101 outputs the multiplexed signal to the transmitter 102.

The transmitter 102 has, for example, a circuit structure, and performs error correction coding and modulation processing by single carrier block transmission on the input multiplexed signal. Then, the transmitter 102 applies the delayed transmission diversity to output the radio signal modulated from the antenna 102A and the antenna 102B of the transmitter 102 by the single carrier block transmission method.

The receiver 103 has, for example, a circuit structure, and performs equalization processing and demodulation processing according to the MMSE standard on the modulated radio signals input to the antenna 103A and the antenna 103B of the receiver 103. After that, the receiver 103 performs error correction decoding on the equalized and demodulated signals, and outputs the decoded signal to the multiplexing unit 104.

The multiplexing unit 104 has, for example, a circuit structure, and separates signals input from the receiver 103 and outputs them to various devices.

FIG. 2 is a diagram showing an example of the configuration of a receiver 103 equipped with a transmission line equalization processing device according to the present embodiment.

The orthogonal demodulation unit 201 converts the carrier frequency passband signal (that is, the modulated radio signal input to the antenna 103A and the antenna 103B of the receiver 103) into a baseband signal having an I phase and a Q phase. Convert.

The synchronization unit 202 synchronizes the frequency and timing with respect to the input baseband signal having the I phase and the Q phase. Then, the synchronization unit 202 outputs the baseband signal in the time domain after synchronization to the FFT unit 203.

The FFT unit 203 performs a Fourier transform process on the baseband signal in the time domain input from the synchronization unit 202. Then, the FFT unit 203 converts the baseband signal into a signal in the frequency domain.

The transmission line equalization unit 204 as the transmission line equalization processing device performs the transmission line equalization processing on the signal including the transmission line distortion input from the FFT unit 203. Then, the transmission line equalization unit 204 outputs the signal after the transmission line equalization to the IDFT unit 205.

The IDFT unit 205 extracts subcarriers corresponding to payload signals other than pilot signals from the signals after transmission line equalization. Then, the IDFT unit 205 reconverts the signal into a time domain signal by performing an inverse Fourier transform. After that, the IDFT unit 205 outputs the signal to the demapping unit 206.

The demapping unit 206 calculates the log-likelihood ratio (log-likelihood ratio, that is, LLR) from the signal input from the IDFT unit 205. Then, the demapping unit 206 outputs the calculated LLR as an LLR signal to the decoding unit 207.

The decoding unit 207 decodes the signal into a bit sequence based on the input LLR signal. Then, the decoding unit 207 outputs the decoded signal to the multiplexing unit 104.

Next, the operation of the transmission line equalization processing device according to the present embodiment will be described below with reference to FIG. Note that FIG. 3 is a diagram showing in detail an example of the configuration of the transmission line equalization unit 204 as the transmission line equalization processing device.

First, from the FFT unit 203, the signal is selected and output in a state where the pilot signal and the payload signal are mixed on the sample (hereinafter referred to as the resource element) defined by the subcarrier in the frequency domain and the symbol in the time domain. It is input to the unit 301.

The selection output unit 301 outputs the signal of the resource element corresponding to the pilot signal to the transmission line estimation unit 302, and outputs the signal of the resource element corresponding to the payload signal to the transmission line estimation unit 302 and the MMSE equalization unit 304.

The transmission line estimation unit 302 multiplies the signal of the resource element corresponding to the input pilot signal by the reciprocal of the pilot signal. By doing so, the transmission line estimation unit 302 calculates the inverse modulation transmission line estimation value X1 in the resource element corresponding to the pilot signal.

Further, the transmission line estimation unit 302 applies a two-dimensional filter using the inverse modulation transmission line estimation value X1 in the resource element corresponding to the plurality of pilot signals, thereby applying an interpolated transmission line estimation value in the resource element corresponding to the pilot signal. Calculate Y1.

Further, the transmission line estimation unit 302 also performs interpolation in the resource element corresponding to the payload signal by applying a two-dimensional filter to the resource element corresponding to the payload signal by using the inverse modulation transmission line estimation value X1 in the same manner as the pilot signal. The transmission line estimated value Y2 is calculated.

The transmission line estimation unit 302 noise estimates the inverse modulation transmission line estimation value X1 in the resource element corresponding to the pilot signal and the interpolation transmission line estimation value Y1 in the resource element corresponding to the pilot signal obtained above. Output to unit 303.

Further, the transmission line estimation unit 302 outputs the interpolated transmission line estimation value Y2 in the resource element corresponding to the payload signal to the MMSE equalization unit 304.

The noise estimation unit 303 takes a difference between the inversely modulated transmission line estimated value X1 in the resource element corresponding to each input pilot signal and the corresponding interpolated transmission line estimated value Y1, and the power value corresponding to the difference ( The average of the error power) is output to the MMSE equalization unit 304 as noise power used for the MMSE equalization process. The noise power may be a value based on the power value (error power) corresponding to the difference between the inversely modulated transmission line estimated value X1 and the corresponding interpolated transmission line estimated value Y1, and as described above, the power value. It is not limited to the average of (error power).

FIG. 4 is a diagram showing an outline of the operation of the noise estimation unit 303. As an example is shown in FIG. 4, the noise estimation unit 303 has a reverse modulation transmission line estimation value X1 (a resource element shaded in FIG. 4) corresponding to each input pilot signal. The difference between the solid line arrow in FIG. 4) and the interpolated transmission line estimated value Y1 (dotted arrow in FIG. 4) in the resource element (resource element shaded in FIG. 4) corresponding to the pilot signal is taken, and the difference is taken. Calculate the average of the power values corresponding to.

Then, the noise estimation unit 303 outputs the average of the calculated power values to the MMSE equalization unit 304 as noise power used for the MMSE equalization process.

The MMSE equalization unit 304 includes a signal of the resource element corresponding to the payload signal input from the selection output unit 301 and an interpolated transmission line estimation value Y2 in the resource element corresponding to the payload signal input from the transmission line estimation unit 302. , The noise power input from the noise estimation unit 303 is used to perform the equalization process according to the MMSE standard.

Specifically, the equalization process is carried out based on the following equation (1).

Here, Y is a signal of the resource element corresponding to the payload signal input from the selection output unit 301, and H is an interpolation transmission line estimation in the resource element corresponding to the payload signal input from the transmission line estimation unit 302. It is a value, σ is the noise power input from the noise estimation unit 303, and X is the equalization result.

Further, the error power between the inversely modulated transmission line estimated value and the ideal transmission line value represents the thermal noise power. Further, the interpolated transmission line estimated value is used for equalizing the payload signal, and the error power between the interpolated transmission line estimated value and the ideal transmission line value is the transmission line when equalizing the payload signal. Represents the estimated error power.

Since there is no correlation between the thermal noise power and the transmission line estimation error power, the error power between the inverse modulation transmission line estimated value and the interpolated transmission line estimated value is the thermal noise power and the transmission as shown in the following equation (2). It can be seen that it represents the sum of the path estimation error powers (that is, both the thermal noise power and the transmission line estimation error power are included).

Here, h _inv indicates an inversely modulated transmission line estimated value, _hint indicates an interpolated transmission line estimated value, and _{hidden indicates an ideal} transmission line.

Further, E [| Δh _inv | ² ] indicates thermal noise power, and E [| Δh _intp | ² ] indicates transmission line estimation error power.

As described above, the error power between the inversely modulated transmission line estimated value X1 and the interpolated transmission line estimated value Y1 of each pilot signal scattered in the frequency direction (frequency domain) or the time direction (time domain) is obtained and calculated. By averaging (that is, by calculating the noise power by the noise estimation unit 303), the sum of the thermal noise power and the transmission line estimation error power can be estimated.

Therefore, even when the transmission line estimation error power is sufficiently larger than the thermal noise power, the sum of the thermal noise power and the transmission line estimation error power is estimated as noise power and the MMSE equalization process is performed. , The inconsistency of the noise term of MMSE equalization does not occur, and the effect that the accuracy of the transmission line equalization process does not deteriorate can be obtained.

<Second embodiment>
The transmission line equalization processing apparatus and the transmission line equalization processing method according to the present embodiment will be described. In the following description, components similar to the components described in the above-described embodiment will be illustrated with the same reference numerals, and detailed description thereof will be omitted as appropriate. ..

<About the configuration of the transmission line equalization processing device>
In the first embodiment, the noise estimation unit 303 may calculate the average of the error powers of the inverse modulation transmission line estimation value X1 and the interpolation transmission line estimation value Y1 in the resource elements corresponding to all the pilot signals. Although shown, in the present embodiment, first, a case where the above average is calculated for each receiving antenna (antenna 103A and antenna 103B) and weighted according to the ratio of the power for each receiving antenna will be described.

The operation of the transmission line equalization processing device according to the present embodiment will be described below with reference to FIG. Note that FIG. 5 is a diagram showing in detail an example of the configuration in the transmission line equalization unit 204A as the transmission line equalization processing device.

The power calculation unit 305 calculates the power value for each receiving antenna from the signals in the resource element corresponding to each pilot signal input from the selection output unit 301. Then, the power calculation unit 305 outputs the calculated power value to the noise estimation unit 303.

The noise estimation unit 303 calculates the average of the power values (error powers) corresponding to the difference between the inversely modulated transmission line estimated value X1 and the interpolated transmission line estimated value Y1 in the resource element corresponding to the pilot signal for each receiving antenna. After that, the average of the error powers for each receiving antenna calculated earlier is weighted and averaged using the power value for each receiving antenna input from the power calculation unit 305.

Then, the noise estimation unit 303 outputs the error power corresponding to the plurality of receiving antennas, which is weighted and averaged for each receiving antenna, to the MMSE equalizing unit 304 as noise power.

According to this embodiment, the error power is weighted and averaged based on the power of each receiving antenna. By doing so, for example, the influence of the receiving antenna on which radio waves are not input due to a shield or the like can be minimized. Therefore, the estimation accuracy of the noise power can be improved.

<About the effect caused by the above-described embodiment>
Next, an example of the effect produced by the above-described embodiment will be shown. In the following description, the effect is described based on the specific configuration shown in the embodiment described above, but to the extent that the same effect occurs, the examples in the present specification. May be replaced with other specific configurations indicated by.

Further, the replacement may be made across a plurality of embodiments. That is, it may be the case that the respective configurations shown in the examples in different embodiments are combined to produce the same effect.

According to the embodiment described above, the transmission line equalization processing device includes a transmission line estimation unit 302, a noise estimation unit 303, and an MMSE equalization unit 304. The transmission line estimation unit 302 calculates the corresponding first inverse modulation transmission line estimation value from a plurality of resource elements corresponding to the pilot signal of the input signal. Here, the first reverse modulation transmission line estimated value corresponds to, for example, the reverse modulation transmission line estimated value X1. Then, the transmission line estimation unit 302 calculates the first interpolated transmission line estimation value based on the plurality of reverse modulation transmission line estimation values X1. Here, the first interpolated transmission line estimated value corresponds to, for example, the interpolated transmission line estimated value Y1. Further, the transmission line estimation unit 302 calculates a second interpolated transmission line estimation value in a plurality of resource elements corresponding to the payload signal of the input signal based on the plurality of reverse modulation transmission line estimation values X1. Here, the second interpolated transmission line estimated value corresponds to, for example, the interpolated transmission line estimated value Y2. The noise estimation unit 303 estimates the noise power based on the difference between each inversely modulated transmission line estimated value X1 and the corresponding interpolated transmission line estimated value Y1 (for example, by averaging). The MMSE equalization unit 304 performs the MMSE standard equalization processing based on the noise power, at least one resource element corresponding to the payload signal of the signal, and the interpolation transmission line estimated value Y2.

According to such a configuration, the signal is received with a power sufficiently larger than the thermal noise power by performing the equalization processing based on the noise power corresponding to the sum of the thermal noise power and the transmission line estimation error power. Even in this case (that is, regardless of the magnitude of the power of the input signal), deterioration of the accuracy of the transmission line equalization process can be suppressed.

In addition, when other configurations shown in the present specification are appropriately added to the above configurations, that is, when other configurations in the present specification not mentioned as the above configurations are appropriately added. Even if there is, the same effect can be produced.

Further, according to the above-described embodiment, the difference between the inverse modulation transmission line estimated value X1 and the ideal transmission line value is defined as the thermal noise power, and the interpolated transmission line estimated value Y1 and the ideal transmission line value are used. When the difference between the above and the transmission line estimation error power is taken as the transmission line estimation error power, the noise power is the sum of the thermal noise power and the transmission line estimation error power. According to such a configuration, the noise power corresponds to the sum of the thermal noise power and the transmission line estimation error power, so that the error power other than the thermal noise power (for example, the transmission line estimation error power) becomes the thermal noise power. Even when it becomes dominant in comparison, it is possible to suppress the occurrence of inconsistency with the actual noise level.

Further, according to the embodiment described above, the signal is transmitted by the single carrier block transmission method by applying the delayed transmission diversity. According to such a configuration, deterioration of the accuracy of the transmission line equalization processing can be suppressed by performing the equalization processing based on the noise power corresponding to the sum of the thermal noise power and the transmission line estimation error power. it can.

Further, according to the embodiment described above, the transmission line equalization processing device includes a plurality of antennas (antennas 103A and 103B) into which signals are input, and a power calculation unit that calculates a power value for each antenna. Equipped with 305. Then, the transmission line estimation unit 302 calculates the inverse modulation transmission line estimation value X1, the interpolation transmission line estimation value Y1, and the interpolation transmission line estimation value Y2 for each antenna. Then, the noise estimation unit 303 averages the difference between each inversely modulated transmission line estimated value X1 and the corresponding interpolated transmission line estimated value Y1 for each antenna. Further, the noise estimation unit 303 estimates the noise power corresponding to a plurality of antennas by weighting and averaging the calculated average using the power values of the corresponding antennas. According to such a configuration, the influence of the receiving antenna on which radio waves are not input due to a shield or the like can be minimized. Therefore, the estimation accuracy of the noise power can be improved.

According to the embodiment described above, in the transmission line equalization processing method, the corresponding inverse modulation transmission line estimated value X1 is calculated from a plurality of resource elements corresponding to the pilot signals of the input signal. Then, the interpolated transmission line estimated value Y1 is calculated based on the plurality of reverse modulation transmission line estimated values X1. Further, based on the plurality of inversely modulated transmission line estimated values X1, the interpolated transmission line estimated value Y2 in the plurality of resource elements corresponding to the payload signals of the input signal is calculated. Then, the noise power is estimated based on the difference between each inversely modulated transmission line estimated value X1 and the corresponding interpolated transmission line estimated value Y1 (for example, by averaging). Then, the MMSE standard equalization processing is performed based on the noise power, at least one resource element corresponding to the payload signal of the signal, and the interpolated transmission line estimated value Y2.

According to such a configuration, the signal is received with a power sufficiently larger than the thermal noise power by performing the equalization processing based on the noise power corresponding to the sum of the thermal noise power and the transmission line estimation error power. Even in this case, deterioration of the accuracy of the transmission line equalization process can be suppressed.

If there are no particular restrictions, the order in which each process is performed can be changed.

In addition, when other configurations shown in the present specification are appropriately added to the above configurations, that is, when other configurations in the present specification not mentioned as the above configurations are appropriately added. Even if there is, the same effect can be produced.

<About the modified example of the embodiment described above>
In the embodiments described above, the materials, materials, dimensions, shapes, relative arrangement relationships, implementation conditions, etc. of each component may also be described, but these are one example in all aspects. However, it is not limited to those described in the present specification.

Therefore, innumerable variants and equivalents for which examples are not shown are envisioned within the scope of the techniques disclosed herein. For example, when transforming, adding or omitting at least one component, or when extracting at least one component in at least one embodiment and combining it with the component in another embodiment. Shall be included.

Further, as long as there is no contradiction, the components described as being provided with "one" in the above-described embodiment may be provided with "one or more".

Further, each component in the above-described embodiment is a conceptual unit, and within the scope of the technology disclosed in the present specification, one component is composed of a plurality of structures. And the case where one component corresponds to a part of a structure, and further, the case where a plurality of components are provided in one structure.

In addition, each component in the above-described embodiment shall include a structure having another structure or shape as long as it exhibits the same function.

In addition, the description in the present specification is referred to for all purposes related to the present technology, and none of them is recognized as a prior art.

100 Communication system, 101, 104 multiplexing unit, 102 transmitter, 102A, 102B, 103A, 103B antenna, 103 receiver, 201 orthogonal demodulation unit, 202 synchronization unit, 203 FFT unit, 204, 204A transmission line equalization unit, 205 IDFT unit, 206 demapping unit, 207 decoding unit, 301 selection output unit, 302 transmission line estimation unit, 303 noise estimation unit, 304 MMSE equalization unit, 305 power calculation unit.

Claims (10)

The corresponding first reverse modulation transmission line estimated value is calculated from the plurality of resource elements corresponding to the pilot signal of the input signal, and the first interpolation is performed based on the plurality of the first reverse modulation transmission line estimated values. A channel estimate is calculated, and based on the plurality of first inversely modulated channel estimates, a second interpolated channel estimate in the plurality of resource elements corresponding to the input payload signal of the signal is obtained. The channel estimation unit to be calculated and
A noise estimation unit that estimates noise power based on the difference between each of the first inversely modulated transmission line estimated values and the corresponding first interpolated transmission line estimated value.
The MMSE equalization unit that performs the MMSE standard equalization process based on the noise power, at least one resource element corresponding to the payload signal of the signal, and the second interpolated transmission line estimated value. Prepare, prepare
Transmission line equalization processing device. The transmission line equalization processing device according to claim 1.
The noise estimation unit estimates the noise power by averaging the difference between each of the first inversely modulated transmission line estimated values and the corresponding first interpolated transmission line estimated value.
Transmission line equalization processing device. The transmission line equalization processing device according to claim 1 or 2.
The difference between the first inverse modulation transmission line estimated value and the ideal transmission line value is defined as thermal noise power.
When the difference between the first interpolated transmission line estimated value and the ideal transmission line value is used as the transmission line estimation error power,
The noise power is the sum of the thermal noise power and the transmission line estimation error power.
Transmission line equalization processing device. The transmission line equalization processing device according to any one of claims 1 to 3.
The signal is transmitted in a single carrier block transmission system by applying delayed transmission diversity.
Transmission line equalization processing device. The transmission line equalization processing device according to any one of claims 1 to 4.
Multiple antennas to which the signal is input and
Further provided with a power calculation unit for calculating the power value for each antenna.
The transmission line estimation unit calculates the first inverse modulation transmission line estimation value, the first interpolation transmission line estimation value, and the second interpolation transmission line estimation value for each of the antennas.
The noise estimation unit averages the difference between the first inversely modulated transmission line estimated value and the corresponding first interpolated transmission line estimated value for each antenna, and further uses the corresponding power value. By weighting and averaging, the noise power corresponding to the plurality of antennas is estimated.
Transmission line equalization processing device. The corresponding first reverse modulation transmission line estimated value is calculated from the plurality of resource elements corresponding to the pilot signal of the input signal, and the first interpolation is performed based on the plurality of the first reverse modulation transmission line estimated values. A channel estimate is calculated, and based on the plurality of first inversely modulated channel estimates, a second interpolated channel estimate in the plurality of resource elements corresponding to the input payload signal of the signal is obtained. Calculate and
The noise power is estimated based on the difference between each of the first inversely modulated transmission line estimates and the corresponding first interpolated transmission line estimates.
The MMSE standard equalization processing is performed based on the noise power, at least one resource element corresponding to the payload signal of the signal, and the second interpolated transmission line estimated value.
Transmission line equalization processing method. The transmission line equalization processing method according to claim 6.
The noise power is estimated by estimating the noise power by averaging the difference between each of the first inversely modulated transmission line estimated values and the corresponding first interpolated transmission line estimated value. is there,
Transmission line equalization processing method. The transmission line equalization processing method according to claim 6 or 7.
The difference between the first inverse modulation transmission line estimated value and the ideal transmission line value is defined as thermal noise power.
When the difference between the first interpolated transmission line estimated value and the ideal transmission line value is used as the transmission line estimation error power,
The noise power is the sum of the thermal noise power and the transmission line estimation error power.
Transmission line equalization processing method. The transmission line equalization processing method according to any one of claims 6 to 8.
The signal is transmitted in a single carrier block transmission system by applying delayed transmission diversity.
Transmission line equalization processing method. The transmission line equalization processing method according to any one of claims 6 to 9.
The power value is calculated for each of the plurality of antennas to which the signal is input, and the power value is calculated.
To calculate the first inversely modulated transmission line estimated value, the first interpolated transmission line estimated value, and the second interpolated transmission line estimated value is the first inversely modulated transmission line estimated value, the first. The interpolated transmission line estimated value and the second interpolated transmission line estimated value are calculated for each of the antennas.
To estimate the noise power, the difference between the first inversely modulated transmission line estimated value and the corresponding first interpolated transmission line estimated value is averaged for each antenna, and the corresponding power is further estimated. The noise power corresponding to the plurality of the antennas is estimated by weighted averaging using the values.
Transmission line equalization processing method.

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