CN114257347A - Channel state information feedback method based on truncated channel impulse response dynamic selection - Google Patents
Channel state information feedback method based on truncated channel impulse response dynamic selection Download PDFInfo
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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Abstract
The invention discloses a channel state information feedback method based on truncated channel impulse response dynamic selection, which mainly solves the problems of overlarge channel state information feedback overhead and poor feedback channel information precision in the prior art. The method comprises the following steps: transmitting a channel sounding packet; measuring a downlink channel; obtaining truncated channel impulse response; according to the channel information quantization codebook, the receiving station quantizes the truncated channel impulse response sequence; if the value of the feedback control parameter of the partial truncated channel impulse response is 0, the receiving station feeds back all the values of the truncated channel impulse response sequence to the sending station; if the channel impulse response is 1, feeding back a part of value of the truncated channel impulse response. The invention reduces the feedback overhead of the channel information and improves the accuracy of the fed back channel information while ensuring the accuracy of the channel information.
Description
Technical Field
The invention belongs to the technical field of communication, and further relates to a channel state information feedback method based on truncated channel impulse response dynamic selection in the technical field of wireless local area networks. The invention can be applied to a multi-antenna system in a wireless local area network to carry out the dynamic feedback of the truncated channel impulse response.
Background
Channel State Information (CSI) refers to a frequency domain Channel property of a communication link in a wireless communication network, and a Channel Impulse Response (CIR) is a result of performing inverse fourier transform processing on the CSI and is a time domain Channel property of the communication link. The CSI/CIR can realize high data rate and reliable communication in a multi-antenna system of a wireless local area network by adapting transmission to the current channel conditions, and has a very broad application prospect. However, with the development of wireless local area networks, the amount of channel information data is greatly increased, so that a large amount of time or bandwidth resources may be required for the amount of CSI data fed back to the transmitter, increasing feedback overhead.
The patent document "Channel prediction for Adaptive Channel State Information (CSI) Feedback Reduction" (application No. US16177005 application publication No. US20200136700A1) of Huacheng technology Limited company proposes a CSI Feedback method based on a Channel prediction algorithm. The method comprises the following implementation steps: first, the receiving device generates predicted CSI based on CSI estimated from at least one previous channel sounding packet stored in the memory and a channel prediction algorithm. The receiving device then determines a channel prediction error based on a difference between the estimated CSI and the predicted CSI, the channel prediction error scaled, encoded to generate a compressed channel prediction error, and the estimated CSI encoded to generate a compressed estimated CSI. Finally, the receiving device feeds back based on the comparison between the compressed channel prediction error and the compressed estimated CSI. Although the method can save feedback overhead, the method still has the disadvantage that when the feedback content is a compressed channel prediction error, the accuracy of the feedback channel information is poor.
Zhongxing communication corporation has a patent technology of "a transmission method and system of channel feedback information" (application number: CN201110194124.4 grant publication number: CN 102882660B) which discloses a transmission method of channel feedback information. The method comprises the following implementation steps: firstly, a sending station sends a wireless frame to a receiving station after obtaining a transmission opportunity, and requests the receiving station to send channel feedback information. And then, after receiving the wireless frame sent by the sending site, the receiving site sends the wireless frame carrying the channel feedback information to the sending site, wherein the sending end time point of the wireless frame carrying the channel feedback information is allowed to exceed the end time point specified by the transmission time threshold of the transmission opportunity. The method can still obtain the channel feedback information of the receiving party in time under the condition that the sending party can not estimate the data volume and the rate of the channel feedback information fed back by the receiving site, but still has the defects that when the data volume of the channel information is overlarge, the transmission time of the channel state information feedback is prolonged, the channel state information feedback overhead and the network time delay are increased, and the overall performance of a multi-antenna system in the wireless local area network is further reduced.
Huashi technology corporation proposed a feedback method based on Truncated Channel Impulse Response (TCIR) in a wireless local area network in the 'Truncated-power-delay-profile' proposed in the protocol standard document of the Institute of Electrical and Electronics Engineers (IEEE). The method comprises the following implementation steps: first, the receiving station estimates CSI using the channel sounding packet. Then, the CSI is processed by inverse fourier transform to generate CIR, at which time the information (angular velocity, doppler information) needed for wireless lan sensing still exists, and the first several complex values of CIR already contain channel information on all paths. Finally, the receiving station takes the first several complex values of CIR as feedback information to be carried in the sensing measurement report frame and fed back to the sending station, namely TCIR feedback. Although the method can save feedback overhead, the method still has the disadvantages that when the deployment environment of the wireless local area network is relatively complex, a plurality of propagation paths (direct paths and scattering paths) exist between the sending station and the receiving station, the data volume of channel information is relatively large, and the feedback overhead of channel state information is increased.
Disclosure of Invention
The present invention aims to provide a channel state information feedback method based on truncated channel impulse response dynamic selection for solving the problem of channel state information feedback overhead increase caused by excessive channel information data amount in a wireless local area network and the problem of poor feedback channel information accuracy caused by processing channel state information by adopting a channel prediction algorithm.
The specific idea of the present invention for achieving the above object is that, in the process of processing the channel state information by using the inverse fourier transform, the frequency domain channel information is simply converted into the time domain channel information, and the information (angular velocity and doppler information) required by the wireless local area network still exists completely, so that the accuracy of the channel information is protected well, and the problem of poor accuracy of the channel information caused by processing the channel state information by using the channel prediction algorithm is solved. In the process of feeding back the value of the truncated channel impulse response sequence, the invention dynamically selects and truncates all or part of the value of the channel impulse response sequence for feeding back, thereby effectively solving the problem of increased channel state information feedback overhead caused by overlarge channel information data.
The technical scheme for realizing the aim of the invention comprises the following steps:
after the transmitting station obtains the transmission opportunity, the transmitting station transmits a null data packet notification frame to the receiving station, and after a short frame interval time, the transmitting station transmits the null data packet frame to the receiving station;
step 2, measuring a downlink channel:
after receiving the null data packet frame, the receiving station measures the channel of each subcarrier between the sending station and the receiving station by using the lead code of the null data packet frame to obtain the channel information on the subcarrier, and the channel information on all the subcarriers forms a channel information sequence;
step 3, obtaining truncated channel impulse response:
the receiving station performs inverse Fourier transform on the channel information sequence to obtain a channel impulse response sequence, and selects the first continuous non-zero values of the channel impulse response sequence to form a truncated channel impulse response sequence;
step 4, quantizing the codebook according to the channel information, and quantizing the truncated channel impulse response sequence by the receiving station;
step 5, judging whether the value of the feedback control parameter of the partial truncated channel impulse response is '0', if so, executing step 6, and if so, executing step 7;
step 6, the receiving station feeds back all the values of the truncated channel impulse response sequence to the sending station;
and 7, feeding back a part of truncated channel impulse response:
and the receiving station feeds back the value of the corresponding position in the truncated channel impulse response sequence to the sending station according to the initial index of the truncated channel impulse response sequence and the number of the truncated channel impulse response values.
Compared with the prior art, the invention has the following advantages:
firstly, the invention adopts inverse Fourier transform to obtain the channel impulse response sequence, so that the precision of the channel information is well protected, the defect of poor precision of the feedback channel information caused by adopting a channel prediction algorithm to process the channel state information in the prior art is overcome, and the precision of the feedback channel information is improved.
Secondly, the invention ensures that a receiving station in the wireless local area network does not need to feed back all the values of the truncated channel impulse response sequence in real time by feeding back all or part of the values of the truncated channel impulse response sequence, overcomes the defect of increased channel state information feedback overhead caused by overlarge channel information data quantity in the prior art, and reduces the feedback overhead of the channel information while ensuring the accuracy of the channel information.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will be further described with reference to fig. 1 and the examples.
And after a short frame interval time, the transmitting station transmits the empty data packet frame to the receiving station.
The null data packet notification frame refers to parameters related to design according to a network environment where a sending station is located in the wireless local area network, including a part of truncated channel impulse response feedback control parameters associated with truncated channel impulse response dynamic selection, and a start index of a truncated channel impulse response sequence and the number of truncated channel impulse response values, which are respectively used for indicating a start position number and the number of paths specified by the sending station.
And step 2, measuring the downlink channel.
And after the receiving station receives the null data packet frame, measuring the channel of each subcarrier between the sending station and the receiving station by using the lead code of the null data packet frame to obtain the channel information on the subcarrier, and forming a channel information sequence by using the channel information on all subcarriers.
The general form of the channel information on the k-th subcarrier is as follows:
wherein L represents the number of paths, i represents the path number, βiDenotes the gain of the ith path, j is an imaginary unit, Δ f denotes the subcarrier spacing, τiIndicating the delay of the ith path.
The channel information on all subcarriers constituting a channel information sequence can be expressed as:
H＝{h1,h2,...,hK}
where K denotes the total number of subcarriers.
And step 3, obtaining the truncated channel impulse response.
And the receiving station performs inverse Fourier transform on the channel information sequence to obtain a channel impulse response sequence, and selects the first continuous non-zero values of the channel impulse response sequence to form a truncated channel impulse response sequence.
The process of truncating the channel impulse response sequence is as follows:
the channel impulse response is calculated as follows:
wherein, IDFTK[·]Representing a K-point inverse fourier transform.
The sequence
The general form of the kth value of (a) is as follows:
wherein L represents the number of paths, i represents the path number, βiThe gain of the ith path is shown, delta represents an impulse function, and has the characteristics that delta (0) is equal to 1 and other positions are equal to 0,
denotes the sampling interval, K denotes the number of subcarriers, Δ f denotes the subcarrier spacing, τiIndicating the delay of the ith path,
and N < K, represents
Number of consecutive non-zero values in the sequence, τmaxRepresenting the maximum delay spread of the system.
From the above formula, the channel impulse response sequence
The first N values are not 0 and the rest are 0, so selecting
As a truncated channel impulse response sequence
And 4, quantizing the truncated channel impulse response sequence by the receiving station according to the channel information quantization codebook.
The channel information quantization codebook comprises channel code words with the ranks of 1 and 2 of a channel matrix matched with dual polarization, and the channel code words comprise related channel code words and unrelated channel code words.
And 5, judging whether the value of the feedback control parameter of the partial truncated channel impulse response is '0', if so, executing the step 6, and if so, executing the step 7.
The partial truncated channel impulse response feedback control parameter is used by the transmitting station to indicate whether the receiving station feeds back all or part of the value of the truncated channel impulse response according to the environment in which the network is located.
And 6, the receiving site feeds back all the values of the truncated channel impulse response sequence to the sending site.
All values of the truncated channel impulse response sequence already contain all channel information of the system.
And 7, feeding back a part of value of the truncated channel impulse response.
And the receiving station feeds back the value of the corresponding position in the truncated channel impulse response sequence to the sending station according to the initial index of the truncated channel impulse response sequence and the number of the truncated channel impulse response values.
The partial values of the truncated channel impulse response represent channel information on partial paths in the system. The reason why the receiving station feeds back the truncated channel impulse response sequence part value to the sending station is that the sending station does not need to monitor all channels in real time according to the stationarity of the channels, and then the receiving station does not need to always feed back all the values of the truncated channel impulse response sequence, but selects a part of the values in the truncated channel impulse response to feed back according to the path concerned by the sending station.
Claims (3)
1. A channel state information feedback method based on truncated channel impulse response dynamic selection is characterized in that a receiving station in a wireless local area network dynamically selects a value of a truncated channel impulse response sequence to feed back according to a truncated channel impulse response feedback control parameter, an initial index of the truncated channel impulse response sequence and the number of the truncated channel impulse response values; the method comprises the following steps:
step 1, sending a channel detection packet:
after the transmitting station obtains the transmission opportunity, the transmitting station transmits a null data packet notification frame to the receiving station, and after a short frame interval time, the transmitting station transmits the null data packet frame to the receiving station;
step 2, measuring a downlink channel:
after receiving the null data packet frame, the receiving station measures the channel of each subcarrier between the sending station and the receiving station by using the lead code of the null data packet frame to obtain the channel information on the subcarrier, and the channel information on all the subcarriers forms a channel information sequence;
step 3, obtaining truncated channel impulse response:
the receiving station performs inverse Fourier transform on the channel information sequence to obtain a channel impulse response sequence, and selects the first continuous non-zero values of the channel impulse response sequence to form a truncated channel impulse response sequence;
step 4, quantizing the codebook according to the channel information, and quantizing the truncated channel impulse response sequence by the receiving station;
step 5, judging whether the value of the feedback control parameter of the partial truncated channel impulse response is '0', if so, executing step 6, and if so, executing step 7;
step 6, the receiving station feeds back all the values of the truncated channel impulse response sequence to the sending station;
and 7, feeding back a part of truncated channel impulse response:
and the receiving station feeds back the value of the corresponding position in the truncated channel impulse response sequence to the sending station according to the initial index of the truncated channel impulse response sequence and the number of the truncated channel impulse response values.
2. The method as claimed in claim 1, wherein the null packet announcement frame in step 1 refers to parameters related to design of a network environment where a transmitting station is located in the wireless local area network, including a part of truncated channel impulse response feedback control parameters associated with the dynamic selection of the truncated channel impulse response, and a start index of a truncated channel impulse response sequence and a number of truncated channel impulse response values, which are used to indicate a start position number and a number of paths specified by the transmitting station, respectively.
3. The channel state information feedback method based on truncated channel impulse response dynamic selection as claimed in claim 1, wherein said channel information quantization codebook in step 4 comprises channel codewords with ranks 1 and 2 of a channel matrix matched with dual polarization, and the channel codewords comprise correlated channel codewords and uncorrelated channel codewords.
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| WO2022199532A1 (en) * | 2021-03-22 | 2022-09-29 | 华为技术有限公司 | Method based on channel state information feedback, device, and medium |
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