61 lines
2.5 KiB
Matlab
61 lines
2.5 KiB
Matlab
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function [staFeedback,PDP,rmsDelay,DopplerShift,rssi_dbm,SNR] = RX_NDPCal(rx,cfgHE,ind,pktOffset,gain)
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addpath(genpath('.\sounding'));
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% ****手动调整NDP的尺寸
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% rxNDP = txNDP(:,1:2);
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% 计算引导矩阵
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numTx = cfgHE.numTx;
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cfgNDP = wlanHESUConfig('APEPLength',0,'GuardInterval',0.8); % No data in an NDP
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cfgNDP.NumTransmitAntennas = numTx;%??
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cfgNDP.NumSpaceTimeStreams = numTx;%??
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txNDP = wlanWaveformGenerator([],cfgNDP);
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len_NDP = length(txNDP);
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% 加入PN序列，正交序列，重复三次左右
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K = 255;
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soundingSeqMod_1 = zadoffChuSeq(29,K);
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soundingSeqMod_2 = zadoffChuSeq(47,K);
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% Concatenate multiple sequences to sound the channel periodically.
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numSeq = 10; % Number of transmitted sequences in a WSS period
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soundingSeqMod = [soundingSeqMod_1, soundingSeqMod_2];
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txSignal = repmat(soundingSeqMod,numSeq,1);
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len_sd = length(txSignal);
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% for userIdx = 1:numUsers
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% NDP被接收端利用计算反馈信息
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% Get the full-band beamforming feedback for a user
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staFeedback = heUserBeamformingFeedback(rx,cfgNDP);
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sounding_seq = rx(len_NDP+1:len_NDP+len_sd);
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[PDP,rmsDelay,DopplerShift] = rxChannelSounding(sounding_seq,cfgHE,numSeq,K);
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% end
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% RSSI
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rxLSTF = rx(pktOffset+(ind.LSTF(1):ind.LSTF(2)),:)./(gain);
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rssi_legancy = mean(abs(rxLSTF).^2);
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rssi_legancy_dbm = 10*log10(rssi_legancy/1e-3);
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rxHETF = rx(pktOffset+(ind.HESTF(1):ind.HELTF(2)),:)./(gain);
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rssi = mean(abs(rxHETF).^2);
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rssi_dbm = 10*log10(rssi/1e-3);
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fprintf(' rssi_legancy: %f dBm\n rssi: %f dBm\n', rssi_legancy_dbm, rssi_dbm);
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% SNR估计
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LLTF = rx(ind.LLTF(1):ind.LLTF(2));
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LLTF_length = length(LLTF);
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LLTF1 = LLTF(1+LLTF_length/5:LLTF_length*3/5);
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LLTF2 = LLTF(1+LLTF_length*3/5:end);
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N = 64;
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LLTF1_fft = ((abs(fftshift(fft(LLTF1)))).^2)/N;
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LLTF2_fft = ((abs(fftshift(fft(LLTF2)))).^2)/N;
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for i = 0:LLTF_length/160-1
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power_signal = sum(LLTF1_fft(i*N+(7:32))) + sum(LLTF1_fft(i*N+(34:59))) + ...
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sum(LLTF2_fft(i*N+(7:32))) + sum(LLTF2_fft(i*N+(34:59)));
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power_noise = sum(LLTF1_fft(i*N+(1:6))) + sum(LLTF1_fft(i*N+(33))) + sum(LLTF1_fft(i*N+(end-4:end))) + ...
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sum(LLTF2_fft(i*N+(1:6))) + sum(LLTF2_fft(i*N+(33))) + sum(LLTF2_fft(i*N+(end-4:end)));
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end
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SNR = 10*log10(power_signal/(power_noise*64/12));
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fprintf(' SNR: %f dB\n', SNR);
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rmpath(genpath('.\sounding'));
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end |