ti_mo
90 lines
3.5 KiB
Matlab
90 lines
3.5 KiB
Matlab
function [numPacketErrors, numPacketsSimulated, cfrMagnitudes]= simulateTransmission(cfgEHT, channel, maxChDelay, snr, maxNumPackets, maxNumErrors, simParameters, chanBW, substreamIndex, elevationAngles, enablePilotTracking)
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% assure backwards compatibility
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if nargin < 11
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enablePilotTracking = false;
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end
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numPacketErrors = 0;
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numPacketsSimulated = 0;
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cfrMagnitudes = [];
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ofdmInfo = wlanEHTOFDMInfo('EHT-Data', cfgEHT);
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ind = wlanFieldIndices(cfgEHT);
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if nargin < 9
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substreamIndex = 1;
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end
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if nargin < 10
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elevationAngles = simParameters.ElevationAngle * ones(1, maxNumPackets);
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end
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stream = RandStream('combRecursive', Seed=simParameters.Seed);
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stream.Substream = substreamIndex;
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RandStream.setGlobalStream(stream);
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snrVal = convertSNR(snr, "snrsc", "snr", FFTLength=ofdmInfo.FFTLength, NumActiveSubcarriers=ofdmInfo.NumTones);
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while numPacketErrors < maxNumErrors && numPacketsSimulated < maxNumPackets
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numPacketsSimulated = numPacketsSimulated + 1;
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packetElevationAngle = elevationAngles(numPacketsSimulated);
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channel.SatelliteDopplerShift = dopplerShiftCircularOrbit(packetElevationAngle, simParameters.SatelliteAltitude, simParameters.MobileAltitude, simParameters.CarrierFrequency);
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txPSDU = randi([0 1], psduLength(cfgEHT) * 8, 1);
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tx = wlanWaveformGenerator(txPSDU, cfgEHT);
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txPad = [tx; zeros(maxChDelay, cfgEHT.NumTransmitAntennas)];
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reset(channel);
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rx = awgn(channel(txPad), snrVal);
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coarsePacketOffset = wlanPacketDetect(rx, chanBW);
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if isempty(coarsePacketOffset)
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numPacketErrors = numPacketErrors + 1;
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continue;
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end
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lstf = rx(coarsePacketOffset + (ind.LSTF(1) : ind.LSTF(2)), :);
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coarseFrequencyOffset = wlanCoarseCFOEstimate(lstf, chanBW);
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rx = frequencyOffset(rx, simParameters.SampleRate, -coarseFrequencyOffset);
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nonhtfields = rx(coarsePacketOffset + (ind.LSTF(1) : ind.LSIG(2)), :);
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finePacketOffset = wlanSymbolTimingEstimate(nonhtfields, chanBW);
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packetOffset = coarsePacketOffset + finePacketOffset;
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if packetOffset > maxChDelay
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numPacketErrors = numPacketErrors + 1;
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continue;
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end
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rxLLTF = rx(packetOffset + (ind.LLTF(1) : ind.LLTF(2)), :);
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fineFrequencyOffset = wlanFineCFOEstimate(rxLLTF, chanBW);
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rx = frequencyOffset(rx, simParameters.SampleRate, -fineFrequencyOffset);
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rxHELTF = rx(packetOffset + (ind.EHTLTF(1) : ind.EHTLTF(2)), :);
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heltfDemod = wlanEHTDemodulate(rxHELTF, "EHT-LTF", cfgEHT);
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[chanEstimate, pilotEstimate] = wlanEHTLTFChannelEstimate(heltfDemod, cfgEHT);
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cfrMagnitudes(:, end + 1) = abs(chanEstimate(:, 1, 1));
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rxData = rx(packetOffset + (ind.EHTData(1) : ind.EHTData(2)), :);
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demodSym = wlanEHTDemodulate(rxData, "EHT-Data", cfgEHT);
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if enablePilotTracking
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demodSym = wlanEHTTrackPilotError(demodSym, chanEstimate, cfgEHT, "EHT-Data");
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end
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nVarEst = wlanEHTDataNoiseEstimate(demodSym(ofdmInfo.PilotIndices, :, :),pilotEstimate, cfgEHT);
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demodDataSym = demodSym(ofdmInfo.DataIndices, :, :);
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chanEstimateData = chanEstimate(ofdmInfo.DataIndices, :, :);
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[eqSym, csi] = wlanEHTEqualize(demodDataSym, chanEstimateData, nVarEst, cfgEHT, 'EHT-Data');
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rxPSDU = wlanEHTDataBitRecover(eqSym, nVarEst, csi, cfgEHT);
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numPacketErrors = numPacketErrors + any(biterr(txPSDU, rxPSDU));
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end
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end
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