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1、%16QAM%等效基带调制clc;clear all;close all;%关闭所有窗口，例如之前画旳图nsymbol = 10000;%每种信噪比下符号数旳发送符号数，106个数errornumber = zeros(1,10);errorratio = zeros(1,10);data = randi(0,1,1,4*nsymbol);%产生1行，4*nsymbol列均匀分布旳随机数data_mod1 = zeros(1,nsymbol);%各参量初始化data_mod2 = zeros(1,nsymbol);data_demod1 = zeros(1,nsymbol);data_demo
2、d2 = zeros(1,nsymbol);data_demod3 = zeros(1,nsymbol);data_demod4 = zeros(1,nsymbol);s_receive1 = zeros(1,nsymbol);s_receive2 = zeros(1,nsymbol);for i = 1:nsymbol %格雷码调制到星座图旳映射 if data(4*i-3)=0 & data(4*i-2)=0 data_mod1(i) = 3; if data(4*i-1)=0 & data(4*i)=0 data_mod2(i) = 3; elseif data(4*i-1)=0 & d
3、ata(4*i)=1 data_mod2(i) = 1; elseif data(4*i-1)=1 & data(4*i)=1 data_mod2(i) = -1; elseif data(4*i-1)=1 & data(4*i)=0 data_mod2(i) = -3; end elseif data(4*i-3)=0 & data(4*i-2)=1 data_mod1(i) = 1; if data(4*i-1)=0 & data(4*i)=0 data_mod2(i) = 3; elseif data(4*i-1)=0 & data(4*i)=1 data_mod2(i) = 1; el
4、seif data(4*i-1)=1 & data(4*i)=1 data_mod2(i) = -1; elseif data(4*i-1)=1 & data(4*i)=0 data_mod2(i) = -3; end elseif data(4*i-3)=1 & data(4*i-2)=1 data_mod1(i) = -1; if data(4*i-1)=0 & data(4*i)=0 data_mod2(i) = 3; elseif data(4*i-1)=0 & data(4*i)=1 data_mod2(i) = 1; elseif data(4*i-1)=1 & data(4*i)
5、=1 data_mod2(i) = -1; elseif data(4*i-1)=1 & data(4*i)=0 data_mod2(i) = -3; end elseif data(4*i-3)=1 & data(4*i-2)=0 data_mod1(i) = -3; if data(4*i-1)=0 & data(4*i)=0 data_mod2(i) = 3; elseif data(4*i-1)=0 & data(4*i)=1 data_mod2(i) = 1; elseif data(4*i-1)=1 & data(4*i)=1 data_mod2(i) = -1; elseif d
6、ata(4*i-1)=1 & data(4*i)=0 data_mod2(i) = -3; end end endSNR_dB = 1:10;%信噪比dB形式SNR = 10.(SNR_dB/10);%信噪比转化为线性值for loop= 1:10 sigma = sqrt(5/SNR(loop); s_receive1 = data_mod1 + sigma * randn(1,length(data_mod1); s_receive2 = data_mod2 + sigma * randn(1,length(data_mod2);%? for k = 1:nsymbol if s_rece
7、ive1(k)2 data_demod1(k) = 0; data_demod2(k) = 0; if s_receive2(k)2 data_demod3(k) = 0; data_demod4(k) = 0; elseif s_receive2(k)0 & s_receive2(k)-2 & s_receive2(k)0 data_demod3(k) = 1; data_demod4(k) = 1; elseif s_receive2(k)0 & s_receive1(k)2 data_demod3(k) = 0; data_demod4(k) = 0; elseif s_receive2
8、(k)0 & s_receive2(k)-2 &s_receive2(k)0 data_demod3(k) = 1; data_demod4(k) = 1; elseif s_receive2(k)-2 data_demod3(k) = 1; data_demod4(k) = 0; end elseif s_receive1(k)-2 data_demod1(k) = 1; data_demod2(k) = 1; if s_receive2(k)2 data_demod3(k) = 0; data_demod4(k) = 0; elseif s_receive2(k)0 & s_receive
9、2(k)-2 & s_receive2(k)0 data_demod3(k) = 1; data_demod4(k) = 1; elseif s_receive2(k)-2 data_demod3(k) = 1; data_demod4(k) = 0; end elseif s_receive1(k)2 data_demod3(k) = 0; data_demod4(k) = 0; elseif s_receive2(k)0 & s_receive2(k)-2 & s_receive2(k)0 data_demod3(k) = 1; data_demod4(k) = 1; elseif s_receive2(k)-2 data_demod3(k) = 1; data_demod4(k) = 0; end end if (data_demod1(k) = data(k*4-3) | (data_demod2(k) = data(k*4-2)|(data_demod3(k) = data(k*4-1) | (data_demod4(k) = data(k*4) errornumber(loop) = errornumber(loop)
