function [staFeedback,PDP,rmsDelay,DopplerShift,rssi_dbm,SNR] = RX_NDPCal(rx,cfgHE,ind,pktOffset,gain)
    addpath(genpath('.\sounding'));
    % ****手动调整NDP的尺寸
    % rxNDP = txNDP(:,1:2);
    % 计算引导矩阵
    numTx = cfgHE.numTx;
    cfgNDP = wlanHESUConfig('APEPLength',0,'GuardInterval',0.8); % No data in an NDP
    cfgNDP.NumTransmitAntennas = numTx;%??
    cfgNDP.NumSpaceTimeStreams = numTx;%??
    txNDP = wlanWaveformGenerator([],cfgNDP);
    len_NDP = length(txNDP);
    % 加入PN序列，正交序列，重复三次左右
    K = 255;
    soundingSeqMod_1 = zadoffChuSeq(29,K);
    soundingSeqMod_2 = zadoffChuSeq(47,K);
    % Concatenate multiple sequences to sound the channel periodically.
    numSeq = 10;   % Number of transmitted sequences in a WSS period
    soundingSeqMod = [soundingSeqMod_1, soundingSeqMod_2];
    txSignal = repmat(soundingSeqMod,numSeq,1);
    len_sd = length(txSignal);
%     for userIdx = 1:numUsers        
        % NDP被接收端利用计算反馈信息
        % Get the full-band beamforming feedback for a user
    staFeedback = heUserBeamformingFeedback(rx,cfgNDP);
    sounding_seq = rx(len_NDP+1:len_NDP+len_sd);
    [PDP,rmsDelay,DopplerShift] = rxChannelSounding(sounding_seq,cfgHE,numSeq,K);
%     end   



    % RSSI
    rxLSTF = rx(pktOffset+(ind.LSTF(1):ind.LSTF(2)),:)./(gain);
    rssi_legancy = mean(abs(rxLSTF).^2);   
    rssi_legancy_dbm = 10*log10(rssi_legancy/1e-3);

    rxHETF = rx(pktOffset+(ind.HESTF(1):ind.HELTF(2)),:)./(gain);
    rssi = mean(abs(rxHETF).^2); 
    rssi_dbm = 10*log10(rssi/1e-3);
    fprintf(' rssi_legancy: %f dBm\n rssi: %f dBm\n', rssi_legancy_dbm, rssi_dbm);

    % SNR估计
    LLTF = rx(ind.LLTF(1):ind.LLTF(2));
    LLTF_length = length(LLTF);
    LLTF1 = LLTF(1+LLTF_length/5:LLTF_length*3/5);
    LLTF2 = LLTF(1+LLTF_length*3/5:end);
    N = 64;
    LLTF1_fft = ((abs(fftshift(fft(LLTF1)))).^2)/N;
    LLTF2_fft = ((abs(fftshift(fft(LLTF2)))).^2)/N;
    
    for i = 0:LLTF_length/160-1
        power_signal = sum(LLTF1_fft(i*N+(7:32))) + sum(LLTF1_fft(i*N+(34:59))) + ...
            sum(LLTF2_fft(i*N+(7:32))) + sum(LLTF2_fft(i*N+(34:59)));
        power_noise = sum(LLTF1_fft(i*N+(1:6))) + sum(LLTF1_fft(i*N+(33))) + sum(LLTF1_fft(i*N+(end-4:end))) + ...
            sum(LLTF2_fft(i*N+(1:6))) + sum(LLTF2_fft(i*N+(33))) + sum(LLTF2_fft(i*N+(end-4:end)));
    end
    SNR = 10*log10(power_signal/(power_noise*64/12));
    fprintf(' SNR: %f dB\n', SNR);

    rmpath(genpath('.\sounding'));
end