OFDM MATLAB 仿真程序

OFDM MATLAB 仿真程序 非常好的程序

% --------------------------------------------- %

% 参数定义 %

% --------------------------------------------- %

NumLoop = 1000;

NumSubc = 128;

NumCP = 8;

SyncDelay = 0;

% 子载波数 128

% 位数/ 符号 2

% 符号数/ 载波 1000

% 训练符号数 0

% 循环前缀长度 8 (1/16)*T

% 调制方式 4-QAM

% 多径信道数 3

% IFFT Size 128

% 信道最大时延 2

% --------------------------------------------- %

% QAM MODULATION %

% --------------------------------------------- %

% Generate the random binary stream for transmit test

BitsTx = floor(rand(1,NumLoop*NumSubc)*2);

% Modulate (Generates QAM symbols)

% input: BitsTx(1,NumLoop*NumSubc); output: SymQAM(NumLoop,NumSubc/2)

SymQAMtmp = reshape(BitsTx,2,NumLoop*NumSubc/2).';

SymQAMtmptmp = bi2de(SymQAMtmp,2,'left-msb');

% QAM modulation

% 00->-1-i,01->-1+i,10->1-i,11->1+i

% 利用查表法进行QAM星座映射

QAMTable = [-1-i -1+i 1-i 1+i];

SymQAM = QAMTable(SymQAMtmptmp+1);

% --------------------------------------------- %

% IFFT %

% --------------------------------------------- %

% input: SymQAM(NumLoop,NumSubc/2); output: SymIFFT(NumSubc,NumLoop)

SymIFFT = zeros(NumSubc,NumLoop);

SymIFFTtmp = reshape(SymQAM,NumSubc/2,NumLoop);

SymIFFTtmptmp = zeros(NumSubc,NumLoop);

SymIFFTtmptmp(1,:) = real(SymIFFTtmp(1,:)); % 实数

SymIFFTtmptmp(NumSubc/2+1,:) = imag(SymIFFTtmp(1,:)); % 实数

% 构造共轭对称矩阵