OFDM系统系统有无cp与均衡的系统比较MATLAB源码.zip

%% 本测试为 不同信道环境下系统误码率曲线 %% close all;clear all; clc; tic ; %计时开始 global CP_len; %定义全局变量 global nSubC; global ifft_len; global bitPerSymbol; global symbolPerCarrier; global s_len; global fade; %信道衰弱 %% 测试参数 %SNR = 40; % dB CP_len = 0;nSubC = 48;ifft_len = 256;bitPerSymbol = 2;symbolPerCarrier = 50; % 开始测试 s_len = nSubC*bitPerSymbol* symbolPerCarrier; SNR = 0:2:20; ber1 = zeros(1,length(SNR));ber2 = zeros(1,length(SNR));ber3 = zeros(1,length(SNR)); for kk = 1:length(SNR) max = floor((2^kk)/10)+10; fprintf('仿真信噪比： %d\n', SNR(kk)); fprintf('仿真点数： %d\n', max*bitPerSymbol*symbolPerCarrier*nSubC); fade = [0]; % 信道参数，下标为延时点数，值为衰减系数 ber = 0; for m = 1:max % 生成用于测试的随机比特 s_in = floor( rand(1, s_len )*2 ); sch = ofdm_mod_eq(s_in); sch = channel(sch,SNR(kk)); s_out = ofdm_demod_eq(sch); %计算误比特率 err_count = sum(abs(s_in-s_out)); ber = ber + err_count/s_len; end ber1(kk) = ber/max; fade = [0, 0, 0, 0, 0.4]; % 信道参数 ber = 0; for m = 1:max s_in = floor( rand(1, s_len )*2 ); sch = ofdm_mod_eq(s_in); sch = channel(sch,SNR(kk)); s_out = ofdm_demod_eq(sch); %计算误比特率 err_count = sum(abs(s_in-s_out)); ber = ber + err_count/s_len; end ber2(kk) = ber/max ; fade = [0, 0, 0, 0, 0.4, 0.3]; % 信道参数，下标为延时点数，值为衰减系数 ber = 0; for m = 1:max % 生成用于测试的随机比特 s_in = floor( rand(1, s_len )*2 ); sch = ofdm_mod_eq(s_in); sch = channel(sch,SNR(kk)); s_out = ofdm_demod_eq(sch); %计算误比特率 err_count = sum(abs(s_in-s_out)); ber = ber + err_count/s_len; end ber3(kk) = ber/max ; end figure(2); semilogy(SNR,ber1,'o-'); hold on;semilogy(SNR,ber2,'r*-');hold on; semilogy(SNR,ber3,'gv-');xlabel('SNR in dB');ylabel('Bit Error Rate'); legend('AWGN','AWGN + 2 path','AWGN + 3 path');grid; toc