www.gusucode.com > wlan 源码程序 matlab案例代码 > wlan/EstimateChannelWithLLTFAndRecoverVHTSIGAExample.m
%% Estimate Channel with L-LTF and Recover VHT-SIG-A %% % Create a VHT format configuration object. Generate L-LTF and VHT-SIG-A % fields. vht = wlanVHTConfig; txLLTF = wlanLLTF(vht); txSig = wlanVHTSIGA(vht); %% % Create a TGac channel for an 80 MHz bandwidth and a Model-A delay % profile. Pass the transmitted L-LTF and VHT-SIG-A signals through the % channel. tgacChan = wlanTGacChannel('SampleRate',80e6,'ChannelBandwidth','CBW80', ... 'DelayProfile','Model-A'); rxLLTFNoNoise = tgacChan(txLLTF); rxSigNoNoise = tgacChan(txSig); %% % Create an AWGN noise channel with an SNR = 15 dB. Add the AWGN noise to % L-LTF and VHT-SIG-A signals. chNoise = comm.AWGNChannel('NoiseMethod','Signal to noise ratio (SNR)', ... 'SNR',15); rxLLTF = chNoise(rxLLTFNoNoise); rxSig = chNoise(rxSigNoNoise); %% % Create an AWGN channel having a noise variance corresponding to a 9 dB % noise figure receiver. Pass the faded signals through the AWGN channel. nVar = 10^((-228.6 + 10*log10(290) + 10*log10(80e6) + 9)/10); awgnChan = comm.AWGNChannel('NoiseMethod','Variance','Variance',nVar); rxLLTF = awgnChan(rxLLTF); rxSig = awgnChan(rxSig); %% % Demodulate the received L-LTF. demodLLTF = wlanLLTFDemodulate(rxLLTF,vht); %% % Estimate the channel using the demodulated L-LTF. chEst = wlanLLTFChannelEstimate(demodLLTF,vht); %% % Recover the VHT-SIG-A signal and verify that there was no CRC failure. [recBits,crcFail] = wlanVHTSIGARecover(rxSig,chEst,nVar,'CBW80'); crcFail