CN112019462B - NR PUCCH (non-return physical uplink control channel) optimal receiving method and system - Google Patents

Abstract

The invention discloses an NR PUCCH optimized receiving method and system, comprising: acquiring pilot symbol information in an FFT frequency domain signal, and performing LS channel estimation with local pre-stored pilot symbols; the base station judges the received signal-to-noise ratio, according to the obtained The LS channel estimation processes the PUCCH; the processing information of the PUCCH is analyzed to obtain a channel estimation result of the entire time-frequency resource. The advantages of the present invention are: easy to implement, good benefits can be obtained by eliminating noise at low signal-to-noise ratios, and coverage is increased; when the base station judges that the threshold is greater than the threshold of the The interpolation method of symbol channel estimation results can make PUCCH applications in medium and high-speed scenarios obtain stable performance; compared with the general method of directly removing noise in the time domain and then interpolating in the frequency domain, it has significant advantages: low signal-to-noise ratio performance Even better, high SNR processing is simpler.

Description

A kind of NR PUCCH optimal reception method and system

technical field

The invention belongs to the technical field of NR gNB receiver receiving scheme processing, in particular to an NR PUCCH optimized receiving method and device.

Background technique

At present, NR is the fifth generation of mobile communication technology, and the system requirements are very extensive. Includes 3 general services: Extreme Mobile Broadband, Massive MTC, and Ultra-Reliable MTC. The PUCCH physical channel in NR is used to send uplink control information Uplink Control Information (UCI). The content of UCI includes: Channel State Feedback CSI, ACK/NACK in HARQ, Scheduling Request (SR) and combination. In order to meet the three services mentioned above, PUCCH is very flexible in scheduling. It has both short format and long format, and supports long format with variable symbol length. The number of resources that can be called by different formats in frequency domain scheduling Not the same.

PUCCH reception is usually optimized for a specific technology, such as channel estimation, detection algorithm, etc., but considering the system level, it is usually not optimal to optimize only for a specific direction of a specific algorithm in terms of system stability. Problem scenario. The relevant prior art that takes into account both low SNR performance and high-speed, high SNR performance has not yet appeared.

Contents of the invention

The purpose of the present invention is to provide an NR PUCCH optimized receiving system to solve the problem of adapting to low signal-to-noise ratio scenarios and high-speed scenarios.

In view of this, the present invention provides a kind of NR PUCCH optimized receiving method, it is characterized in that, comprises:

Obtain the pilot symbol information in the FFT frequency domain signal, and perform LS channel estimation with the local pre-stored pilot symbol;

The base station judges the received signal-to-noise ratio, and processes the PUCCH according to the LS channel estimation;

Analyzing the processing information of the PUCCH to obtain a channel estimation result of the entire time-frequency resource.

In one embodiment, the pilot symbol information in the FFT frequency domain signal is obtained, and the LS channel estimation is performed with the local pre-stored pilot symbols, including:

First, obtain the initial LS channel estimation result;

Secondly, the initial LS channel estimation results of different symbols are combined to obtain the preliminary noise-removed result;

Then, perform noise removal again on the result after the preliminary noise removal;

Finally, the LS channel estimation results of different symbols after noise removal again are applied to all symbols.

In one embodiment, performing noise elimination on the result after the preliminary noise elimination includes: performing noise elimination through transform domain or MMSE filtering.

In one embodiment, the base station judges the received signal-to-noise ratio, and processes the PUCCH according to the LS channel estimation, including: judging that if the signal-to-noise ratio is lower than a certain threshold, performing special denoising processing on the PUCCH.

In one embodiment, special denoising processing is performed on PUCCH, including:

First, the initial LS channel estimation results of different symbols are added corresponding to the same subcarrier position;

Then, average according to the number of additions to obtain the channel estimation results of the averaged equivalent symbols of different subcarriers of an equivalent symbol;

Finally, the channel estimation results of the averaged equivalent symbols are further denoised.

In one embodiment, processing the PUCCH according to the LS channel estimation includes: judging that if the received signal-to-noise ratio is greater than a threshold, performing interpolation between different symbols on the result of the LS channel estimation.

In an embodiment, the interpolation includes: a linear interpolation method or an MMSE interpolation method.

Another object of the present invention is to provide a kind of NR PUCCH optimized receiving system, it is characterized in that, comprises:

The estimation module is used to obtain the pilot symbol information in the FFT frequency domain signal, and perform LS channel estimation with the local pre-stored pilot symbols;

A processing module, used for the base station to judge the received signal-to-noise ratio, and process the PUCCH according to the LS channel estimation;

The output module is configured to analyze the processing information of the PUCCH to obtain a channel estimation result of the entire time-frequency resource.

The present invention has realized following remarkable beneficial effect:

The implementation is simple, including: obtaining the pilot symbol information in the FFT frequency domain signal, and performing LS channel estimation with the local pre-stored pilot symbols; the base station judges the received signal-to-noise ratio, and processes the PUCCH according to the LS channel estimation; analysis The processing information of the PUCCH obtains a channel estimation result of the entire time-frequency resource. The method of eliminating noise at low signal-to-noise ratio can obtain good benefits and increase coverage; the base station can not eliminate noise by judging that the threshold is greater than the threshold of signal-to-noise ratio, but by interpolating channel estimation results of different symbols, which can This enables PUCCH applications in medium and high-speed scenarios to obtain stable performance; compared with the general method of directly removing noise in the time domain and then interpolating in the frequency domain, it has significant advantages: low SNR performance is better, and high SNR processing is more efficient. Simple; taking into account different application scenarios, because the PUCCH modulation order is very low, and the threshold selection range is relatively wide, which has good application value.

Description of drawings

Fig. 1 is the flow chart of NR PUCCH optimized receiving method of the present invention;

Fig. 2 is a schematic diagram of a specific embodiment of the method shown in Fig. 1 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description and claims, the advantages and features of the present invention will be more clear. It should be noted that all the drawings are in very simplified form and inaccurate scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

It should be noted that, in order to clearly illustrate the content of the present invention, the present invention specifically cites multiple embodiments to further explain different implementation modes of the present invention, wherein the multiple embodiments are enumerated rather than exhaustive. In addition, for the sake of brevity of description, the content mentioned in the previous embodiment is often omitted in the latter embodiment, therefore, the content not mentioned in the later embodiment can refer to the previous embodiment accordingly.

Although the invention can be expanded in various forms of modification and replacement, some specific implementation illustrations are also listed in the description and explained in detail. It should be understood that the inventors' intent is not to limit the invention to the particular embodiments described, but on the contrary, the inventors' intent is to protect all improvements, equivalents and modifications given within the spirit or scope defined by the claims. . The same element numbers may be used throughout the drawings to represent the same or similar parts.

Example 1

Please refer to Fig. 1 to Fig. 2, a kind of NR PUCCH optimal receiving method of the present invention, comprises:

Step S101, obtaining pilot symbol information in the FFT frequency domain signal, and performing LS channel estimation with local pre-stored pilot symbols;

Step S102, the base station judges the received signal-to-noise ratio, and processes the PUCCH according to the LS channel estimation;

Step S103, analyzing the processing information of the PUCCH to obtain a channel estimation result of the entire time-frequency resource.

In one embodiment, the pilot symbol information in the FFT frequency domain signal is obtained, and the LS channel estimation is performed with the local pre-stored pilot symbols, including:

First, obtain the initial LS channel estimation result;

Secondly, the initial LS channel estimation results of different symbols are combined to obtain the preliminary noise-removed result;

Then, perform noise removal again on the result after the preliminary noise removal;

Finally, the LS channel estimation results of different symbols after noise removal again are applied to all symbols.

In one embodiment, performing noise elimination on the result after the preliminary noise elimination includes: performing noise elimination through transform domain or MMSE filtering.

In one embodiment, the base station judges the received signal-to-noise ratio, and processes the PUCCH according to the LS channel estimation, including: judging that if the signal-to-noise ratio is lower than a certain threshold, performing special denoising processing on the PUCCH.

In one embodiment, special denoising processing is performed on PUCCH, including:

First, the initial LS channel estimation results of different symbols are added corresponding to the same subcarrier position;

Then, average according to the number of additions to obtain the channel estimation results of the averaged equivalent symbols of different subcarriers of an equivalent symbol;

Finally, the channel estimation results of the averaged equivalent symbols are further denoised.

In one embodiment, processing the PUCCH according to the LS channel estimation includes: judging that if the received signal-to-noise ratio is greater than a threshold, performing interpolation between different symbols on the result of the LS channel estimation.

In an embodiment, the interpolation includes: a linear interpolation method or an MMSE interpolation method.

As a specific embodiment, the technical solution of the present invention mainly includes the following steps:

Step 1. The base station judges the received signal-to-noise ratio, and if the signal-to-noise ratio is lower than a certain threshold, special denoising processing is performed on the PUCCH:

If it is single-symbol control information, perform noise elimination through transform domain or MMSE filtering; if it is multi-symbol control information, if support frequency hopping and a certain frequency hopping resource is 1 symbol, perform noise elimination through transform domain or MMSE filtering. If frequency hopping is supported and a certain frequency hopping resource has more than one symbol, the LS channel estimates of different PUCCH symbols are combined in the frequency domain and then the noise is eliminated through the transform domain or MMSE.

In a low SNR scenario, in order to meet the coverage requirements, the base station will consider long format PUCCH scheduling. Even if frequency domain frequency hopping is enabled, the number of symbols in a certain frequency hopping resource will be more than 1, and the PUCCH symbol LS can be The results of channel estimation are combined first, and the combined symbols are then used to eliminate noise in the transform domain or MMSE, and finally apply the channel estimation information of the noise-eliminated symbols to other different symbols to obtain the channel estimation results of the entire time-frequency domain resource.

Specifically, for PUCCH format0 2-symbol scheduling and no frequency hopping, format2 2-symbol scheduling and no frequency hopping, format1, 3, 4 long symbol scheduling does not have frequency hopping or there is frequency hopping A certain frequency hopping resource satisfies more than 2 symbols The above method can be used for all DMRS symbols, and very significant receiving performance can be obtained.

Step 2, the base station judges the received signal-to-noise ratio, and if the signal-to-noise ratio is not lower than a certain threshold, intersymbol interpolation processing is performed on the PUCCH channel estimation:

The PUCCH modulation method is BPSK, pi/2BPSK, QPSK, the modulation order is not high, and the demodulation threshold is not high. If the signal-to-noise ratio is not lower than a certain threshold, other application scenarios of PUCCH should be considered.

After LS channel estimation, the channel estimation result of the entire time-frequency resource block can be obtained through interpolation between different symbols. This processing method can obtain significant performance especially for long-format PUCCH in high-speed scenarios.

As a specific embodiment, step 1 can obtain significant benefits in a low signal-to-noise ratio environment, including the following steps:

1.1 LS channel estimation of the signal: obtain the initial channel estimation result;

1.2 Combination of LS channel estimation results of different symbols: LS channel estimation results of different symbols are combined to obtain preliminary noise-eliminated results;

1.3 Further noise removal of the merged symbols: perform noise removal on the merged symbols by means of transform domain or MMSE filtering;

1.4 Multiplexing of channel estimation after noise removal: Apply channel estimation results of symbols after noise removal to all symbols.

Example 2

Another object of the present invention is to provide an NR PUCCH optimized receiving system, including:

The estimation module is used to obtain the pilot symbol information in the FFT frequency domain signal, and perform LS channel estimation with the local pre-stored pilot symbols;

A processing module, used for the base station to judge the received signal-to-noise ratio, and process the PUCCH according to the LS channel estimation;

The output module is configured to analyze the processing information of the PUCCH to obtain a channel estimation result of the entire time-frequency resource.

As a specific embodiment, the PUCCH format in NR is divided into format0, format1, format2, format3, format4, where format0, format2 are segment formats, and the supported symbol length is 1-2, format1, format3, and format4 The supported symbol length is 4 -14. In order to make PUCCH work in a scene with a lower signal-to-noise ratio, a better noise cancellation method is generally considered. In order to make PUCCH applicable to more scenes, such as high-speed mobile scenes, the influence of Doppler needs to be considered.

As a specific embodiment, the present invention includes:

Step 1. LS channel estimation

In the FFT frequency domain signal, obtain the pilot symbol information, and perform LS channel estimation with the local pre-stored pilot symbols

Step 2. Judging and selecting different next-step processing branches according to the signal-to-noise ratio threshold

Step 3. Obtain the channel estimation results of the entire time-frequency resource through the processing of different branches

If there is frequency hopping, the processing of the following different branches needs to be performed on different frequency hopping resources; if there is no frequency hopping, the processing is directly performed according to the following different branches. The two different branches of this step are processed as follows:

Branch one:

If the signal-to-noise ratio is less than the threshold, the results of the LS channel estimation are combined with different symbols, specifically:

The LS channel estimation results of different symbols are added corresponding to the same subcarrier position, and then averaged according to the number of additions to obtain an averaged channel estimation result of different subcarriers of an equivalent symbol;

The channel estimation results of the averaged equivalent symbols are further denoised, and the denoising method can use a classic method, such as transform domain or MMSE filtering;

The frequency-domain channel estimation result after further denoising is applied to different symbols to obtain the channel estimation result of the entire time-frequency resource.

Branch two:

If the received signal-to-noise ratio is greater than the threshold, the result of LS channel estimation is interpolated between different symbols. The interpolation method can be an ordinary linear interpolation method or MMSE interpolation method to obtain the channel estimation result of the entire time-frequency resource.

Step 4: Apply the obtained channel estimation results of the entire time-frequency resource to the correlation detection module.

The base station judges the received signal-to-noise ratio, and if the signal-to-noise ratio is not lower than a certain threshold, intersymbol interpolation processing is performed on the PUCCH channel estimation:

The PUCCH modulation method is BPSK, pi/2BPSK, QPSK, the modulation order is not high, and the demodulation threshold is not high. If the signal-to-noise ratio is not lower than a certain threshold, other application scenarios of PUCCH should be considered.

After LS channel estimation, the channel estimation result of the entire time-frequency resource block can be obtained through interpolation between different symbols. This processing method can obtain significant performance especially for long-format PUCCH in high-speed scenarios.

As a specific embodiment, step 1 can obtain significant benefits in a low signal-to-noise ratio environment, including the following steps:

1.1 LS channel estimation of the signal: obtain the initial channel estimation result;

1.2 Combination of LS channel estimation results of different symbols: LS channel estimation results of different symbols are combined to obtain preliminary noise-eliminated results;

1.3 Further noise removal of the merged symbols: perform noise removal on the merged symbols by means of transform domain or MMSE filtering;

1.4 Multiplexing of channel estimation after noise removal: Apply channel estimation results of symbols after noise removal to all symbols.

The present invention has realized following remarkable beneficial effect:

The implementation is simple, including: obtaining the pilot symbol information in the FFT frequency domain signal, and performing LS channel estimation with the local pre-stored pilot symbols; the base station judges the received signal-to-noise ratio, and processes the PUCCH according to the LS channel estimation; analysis The processing information of the PUCCH obtains a channel estimation result of the entire time-frequency resource. The method of eliminating noise at low signal-to-noise ratio can obtain good benefits and increase coverage; the base station can not eliminate noise by judging that the threshold is greater than the threshold of signal-to-noise ratio, but by interpolating channel estimation results of different symbols, which can This enables PUCCH applications in medium and high-speed scenarios to obtain stable performance; compared with the general method of directly removing noise in the time domain and then interpolating in the frequency domain, it has significant advantages: low SNR performance is better, and high SNR processing is more efficient. Simple; taking into account different application scenarios, because the PUCCH modulation order is very low, and the threshold selection range is relatively wide, which has good application value.

According to the technical scheme and concept of the present invention, any other suitable modifications can also be made. For those skilled in the art, all these substitutions, adjustments and improvements should belong to the protection scope of the appended claims of the present invention.

Claims (3)

1. A kind of NR PUCCH optimization receiving method, it is characterized in that, comprising: Obtain an initial LS channel estimation result; Combine the initial LS channel estimation results of different symbols to obtain the preliminary noise-removed result; Carrying out noise elimination again by means of transform domain or MMSE filtering on the result after the preliminary noise elimination; Apply the LS channel estimation results of different symbols after noise removal again to all symbols; Judging that if the signal-to-noise ratio is lower than a certain threshold, perform special denoising processing on the PUCCH. The special denoising processing includes: first, adding the initial LS channel estimation results of different symbols corresponding to the same subcarrier position; then, Performing an average according to the number of additions to obtain an averaged equivalent symbol channel estimation result of different subcarriers of an equivalent symbol; finally, performing further denoising processing on the averaged equivalent symbol channel estimation result; Judging that if the received signal-to-noise ratio is greater than the threshold, the result of LS channel estimation is interpolated between different symbols; Analyzing the processing information of the PUCCH to obtain a channel estimation result of the entire time-frequency resource. 2. The NR PUCCH optimized receiving method according to claim 1, wherein the interpolation comprises: a linear interpolation method or an MMSE interpolation method. 3. A kind of NR PUCCH optimization receiving system, is characterized in that, comprises: The estimation module is used to obtain an initial LS channel estimation result; combine the initial LS channel estimation results of different symbols to obtain a preliminary noise-removed result; and regenerate the preliminary noise-removed result through a transform domain or MMSE filtering method Once noise is eliminated; the LS channel estimation results of different symbols after noise elimination are applied to all symbols; The processing module is used to judge that if the signal-to-noise ratio is lower than a certain threshold, then perform special denoising processing on the PUCCH. The special denoising processing includes: first, initial LS channel estimation results of different symbols corresponding to the same subcarrier position are performed Then, average according to the number of additions to obtain the channel estimation results of the averaged equivalent symbols of different subcarriers of an equivalent symbol; finally, further remove the channel estimation results of the averaged equivalent symbols Noise processing; judging that if the received signal-to-noise ratio is greater than the threshold, the result of LS channel estimation is interpolated between different symbols; the output module is used to analyze the processing information of the PUCCH to obtain the channel estimation result of the entire time-frequency resource.

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