www.gusucode.com > wlan 源码程序 matlab案例代码 > wlan/RecoverVHTSIGAInformationBitsExample.m

    %% Recover VHT-SIG-A Information Bits  
% Recover the information bits in the VHT-SIG-A field by performing channel
% estimation on the L-LTF over a 1x2 quasi-static fading channel
%%
% Create a |wlanVHTConfig| object having a channel bandwidth of 80 MHz.
% Generate L-LTF and VHT-SIG-A field signals using this object.
cfg = wlanVHTConfig('ChannelBandwidth','CBW80');
txLLTF = wlanLLTF(cfg);
[txVHTSIGA, txBits] = wlanVHTSIGA(cfg);
chanBW = cfg.ChannelBandwidth;
noiseVarEst = 0.1;

%%
% Pass the L-LTF and VHT-SIG-A signals through a 1x2 quasi-static fading
% channel with AWGN.
H = 1/sqrt(2)*complex(randn(1,2),randn(1,2));
rxLLTF    = awgn(txLLTF*H,10);
rxVHTSIGA = awgn(txVHTSIGA*H,10);
%%
% Perform channel estimation based on the L-LTF.
demodLLTF = wlanLLTFDemodulate(rxLLTF,chanBW,1);
chanEst = wlanLLTFChannelEstimate(demodLLTF,chanBW);

%%
% Recover the VHT-SIG-A. Verify that the CRC check was successful.
[rxBits,failCRC] = wlanVHTSIGARecover(rxVHTSIGA,chanEst,noiseVarEst,'CBW80');
failCRC
%%
% The CRC failure check returns a |0|, indicating that the CRC passed. 
%%
% Compare the transmitted bits to the received bits. Confirm that the
% reported CRC result is correct because the output matches the input.
isequal(txBits,rxBits)