802.11交流接收机最低输入灵敏度测试

cfgVHT = wlanVHTConfig;%创建VHT传输配置cfgVHT。ChannelBandwidth =“CBW160”;%的带宽cfgVHT。MCS = 7;% 64 - qam,率5/6NumReceiveAntennas = 2;%的接收天线

cfgVHT。一个PEPLength = 4096;%字节cfgVHT。摘要= false;cfgVHT。NumTransmitAntennas = NumReceiveAntennas;cfgVHT。NumSpaceTimeStreams = NumReceiveAntennas;cfgVHT。SpatialMapping =“直接”;cfgVHT。GuardInterval =“长”;

testInputLevelOffsets = [-10 9 8 7];% dB

maxNumErrors = 20;maxNumPackets = 200;

% 20 MHz接收机灵敏度最低输入电平,表21 - 25日。的%的敏感性增加3 db带宽的两倍。rxMinSensitivityTable = (-82 -79 -77 -74 -70 -66 -65 -64 -59 -57);% dBm%得到最小输入灵敏度MCS和带宽fs = wlanSampleRate (cfgVHT);%基带采样频率(赫兹)B =地板(10 * log10 ((fs / 20 e6)));%标量的带宽rxMinSensitivity = rxMinSensitivityTable (cfgVHT.MCS + 1) + B;% dBmdisp ([“最低灵敏度MCS”num2str (cfgVHT.MCS)”、“…num2str (fs / 1 e6)”MHz,“num2str (rxMinSensitivity' % 2.1 f ')dBm的])

testInputLevels = rxMinSensitivity + testInputLevelOffsets;% dBm

= 10 ^。((testInputLevels-30) / 20);%电压增益(衰减)一个= * sqrt (cfgVHT.NumTransmitAntennas);%发电机占比例

NF = 6;%噪声图(dB)T = 290;%环境温度(K)BW = f;%的带宽(赫兹)k = 1.3806 e-23;%玻耳兹曼常量(J / K)noiseFloor = 10 * log10 (k * T * BW) + NF;% dBdisp ([“接收机噪声地板:“num2str (noiseFloor + 30,' % 2.1 f ')dBm的])

awgnChannel = comm.AWGNChannel (“NoiseMethod”,“方差”,…“方差”10 ^ (noiseFloor / 10));

印第安纳州= wlanFieldIndices (cfgVHT);%用于访问字段包内chanBW = cfgVHT.ChannelBandwidth;rng (0);%设置随机状态可重复性agc = comm.AGC;%自动增益控制S =元素个数(testInputLevels);packetErrorRate = 0(年代,1);rxAntennaPower = 0(年代,1);为i = 1:年代disp ([“模拟”num2str (testInputLevels(我),' % 2.1 f ')…“dBm输入电平…”]);%循环模拟多个数据包numPacketErrors = 0;measuredPower = 0 (maxNumPackets, 1);%每个天线平均功率numPkt = 1;%指数数据包传输而numPacketErrors < = maxNumErrors & & numPkt < = maxNumPackets%生成一个数据包波形txPSDU =兰迪([0,1],cfgVHT.PSDULength * 8, 1);% PSDULength以字节为单位tx = wlanWaveformGenerator (txPSDU cfgVHT);%范围内输入信号所需的水平rx = tx。*(我);%的平均功率测量天线连接器在瓦茨measuredPower (numPkt) =平均(平均(rx。*连词(rx)));在接收机%添加噪声地板rx = awgnChannel (rx);%每个通道穿过AGC为ic = 1:尺寸(rx, 2) rx (:, ic) = agc (rx (:, ic));重置(agc);结束%包检测和确定粗包抵消chanBW coarsePktOffset = wlanPacketDetect (rx);如果isempty (coarsePktOffset)%如果空没有L-STF检测;包错误numPacketErrors = numPacketErrors + 1;numPkt = numPkt + 1;继续;%去下一个循环迭代结束%提取L-STF并执行粗频率偏移校正lstf = rx (coarsePktOffset + (ind.LSTF (1): ind.LSTF (2)),:);coarseFreqOff = wlanCoarseCFOEstimate (lstf chanBW);rx = frequencyOffset (rx, fs -coarseFreqOff);%提取non-HT领域并确定好包抵消nonhtfields = rx (coarsePktOffset + (ind.LSTF (1): ind.LSIG (2)),:);finePktOffset = wlanSymbolTimingEstimate (nonhtfields chanBW);%确定最终包抵消pktOffset = coarsePktOffset + finePktOffset;%如果数据包检测到一个合理的范围内(> 50个样本);%包错误如果pktOffset > 50 numPacketErrors = numPacketErrors + 1;numPkt = numPkt + 1;继续;%去下一个循环迭代结束%提取L-LTF并执行好频率偏移校正lltf = rx (pktOffset + (ind.LLTF (1): ind.LLTF (2)),:);fineFreqOff = wlanFineCFOEstimate (lltf chanBW);rx = frequencyOffset (rx, fs -fineFreqOff);%从波形中提取VHT-LTF样本,解调并执行%信道估计vhtltf = rx (pktOffset + (ind.VHTLTF (1): ind.VHTLTF (2)),:);vhtltfDemod = wlanVHTLTFDemodulate (vhtltf cfgVHT);(陈,chanEstSSPilots) = wlanVHTLTFChannelEstimate (vhtltfDemod cfgVHT);%从波形中提取VHT数据样本vhtdata = rx (pktOffset + (ind.VHTData (1): ind.VHTData (2)),:);%的噪声功率估计VHT数据字段nEstVHT = vhtNoiseEstimate (vhtdata chanEstSSPilots cfgVHT);%恢复PSDU VHT数据传输rxPSDU = wlanVHTDataRecover (vhtdata,成龙、nEstVHT cfgVHT,…“LDPCDecodingMethod”,“norm-min-sum”);%确定任何比特错误,即数据包错误packetError =任何(biterr (txPSDU rxPSDU));numPacketErrors = numPacketErrors + packetError;numPkt = numPkt + 1;结束%计算包错误率在输入电平点(/)packetErrorRate (i) = numPacketErrors / (numPkt-1);disp ([完成后的…num2str (numPkt-1)“每包:”…num2str (packetErrorRate (i))));%计算平均输入功率天线rxAntennaPower (i) = 10 * log10(平均(measuredPower (1: (numPkt-1)))) + 30;disp ([的测量天线连接器的力量:…num2str (rxAntennaPower(我),' % 2.1 f ')dBm的]);结束

图semilogy (rxAntennaPower packetErrorRate,“啊——”)举行在semilogy (rxMinSensitivity, 0.1,“处方”)currentxlim = xlim (gca);xlim ([currentxlim (1) currentxlim(2) + 1])网格在包含(每个天线连接器的测量能力(dBm) ');ylabel (“每”);传奇(“模拟/性能”,的最大/最小灵敏度的);标题(sprintf ([的最小输入灵敏度测试:MCS % d % d MHz,”…“% d天线”,cfgVHT.MCS fs / 1 e6, cfgVHT.NumTransmitAntennas))