Matlab OFDM 调制解调器 | Twy's Blog

[tianweiye]

https://tianweiye.github.io/2019/11/12/Matlab-OFDM-%E8%B0%83%E5%88%B6%E8%A7%A3%E8%B0%83%E5%99%A8/?cache-bust=1573496397636

[tianweiye]

• size(y2) : [160 1] %160 =2(64+16) cp长16
• size(dataIn): [58 2]. %58 =64-4-2 空sym2 pilot长4
• size(pilots): [4 2]

[tianweiye]

另一种方法

clc;

%创建mod
mod = comm.OFDMModulator('FFTLength',64,'NumSymbols',2,...
    'InsertDCNull',true);

%CP长
mod.CyclicPrefixLength=16;

%前后 GI 长度 
mod.NumGuardBandCarriers=[0;0];

%开启pilot
mod.PilotInputPort = true; 

%pilot位置
mod.PilotCarrierIndices = [7];

%symbol可视化
 showResourceMapping(mod)
modDim = info(mod);

%生成发送symbol    16-1-1 null占一个Pilot占一个
dataIn = complex(randn(62,2),randn(62,2)); 

%生成发送pilot
pilotIn = complex(rand(1,2),rand(1,2));

%生成 OFDM symbols
modData = step(mod,dataIn,pilotIn);

%生成 OFDM解调器
demod = comm.OFDMDemodulator(mod);

%解调，输出
[dataOut, pilotOut] = step(demod,modData);

size(modData) = [160 1] size(dataOut) = [62 2] 64-1-1 cp长1 null长1 size(pilotOut) = [1 2]

[tianweiye]

参考网页

ofdmmod(...)

ofdmdemod(...)

comm.OFDMModulator(...)

comm.OFDMDemodulator(...)

awgn(...)