29 lines
1000 B
Matlab
29 lines
1000 B
Matlab
function txNDP = channelSounding(cfg)
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% 产生NDP
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guardInterval = 0.8;% Guard interval in Microseconds
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cfgNDP = wlanHESUConfig('APEPLength',0,'GuardInterval',guardInterval); % No data in an NDP
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cfgNDP.ChannelBandwidth = cfg.ChannelBandwidth;
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cfgNDP.NumTransmitAntennas = cfg.numTx;
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cfgNDP.NumSpaceTimeStreams = cfg.numTx;
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txNDP = wlanWaveformGenerator([],cfgNDP);
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% 加入PN序列，正交序列，重复三次左右
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soundingSeqMod_1 = zadoffChuSeq(29,255);
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soundingSeqMod_2 = zadoffChuSeq(47,255);
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% Concatenate multiple sequences to sound the channel periodically.
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numSeq = 20; % Number of transmitted sequences in a WSS period
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if cfg.numTx == 1
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soundingSeqMod = [soundingSeqMod_1];
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txSignal = repmat(soundingSeqMod,numSeq,1);
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else
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soundingSeqMod = [soundingSeqMod_1, soundingSeqMod_2];
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txSignal = repmat(soundingSeqMod,numSeq,1);
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end
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% with 50 sample padding.
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% txNDP = [txNDP; zeros(50,size(txNDP,2))];
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txNDP = [txNDP; txSignal; zeros(50,size(txNDP,2))];
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end
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