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標(biāo)題: OFDM系統(tǒng)系統(tǒng)有無cp與均衡的系統(tǒng)比較 MATLAB源碼 [打印本頁]

作者: 314TT 時(shí)間: 2018-4-20 20:54
標(biāo)題: OFDM系統(tǒng)系統(tǒng)有無cp與均衡的系統(tǒng)比較 MATLAB源碼
ofdm系統(tǒng)有無cp與均衡的系統(tǒng)比較

MATLAB源程序如下:

function [s_out] = ofdm_mod_eq( s_in )
%% ofdm 調(diào)制，帶均衡
%% 輸入：二進(jìn)制序列
%% 輸出：ofdm調(diào)制后符號(hào)
%global CP_len;
global nSubC
global ifft_len;
global symbolPerCarrier;
global bitPerSymbol;
global trainingSymbols;
global trainingSymbols_len;
global CP_len;
global carriers;
len = length(s_in);
SQam = reshape(s_in, nSubC,len/nSubC); %串并轉(zhuǎn)換
PQam = Qam4_mod(SQam);
tmpTable = [-1,1,i,-i];
trainingSymbols_len = 10;
trainingSymbols = (tmpTable(floor(4*rand(trainingSymbols_len,nSubC))+1 ))';
PQam = cat(2,zeros(nSubC,1),PQam);
PQam = cat(2,trainingSymbols,PQam);
carriers = (1: nSubC) + (floor( ifft_len/4) - floor(nSubC/2));
conj_carriers = ifft_len - carriers + 2;
P_IFFT = zeros(ifft_len,1 + symbolPerCarrier + trainingSymbols_len);
P_IFFT(carriers,:) = PQam;
P_IFFT(conj_carriers,:)=conj(PQam) ;
PCh = (ifft( P_IFFT ,ifft_len,1));
PCh2 = cat(1, PCh((ifft_len-CP_len+1):ifft_len,:), PCh); % 添加 CP
s_out = reshape(PCh2, 1, (ifft_len+CP_len)*(symbolPerCarrier +trainingSymbols_len + 1)); %并串轉(zhuǎn)換

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