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1、16QAM%等效基带调制clc;clear all;close all;%关闭所有窗口，比如之前画的图nsymbol = 10000;%每种信噪比下符号数的发送符号数，106 个数errornumber = zeros(1,10); errorratio = zeros(1,10);data = randi(0,1,1,4*nsymbol);%产生 1 行，4*nsymbol 列均匀分布的随机数data_mod1 = zeros(1,nsymbol);%各参量初始化data_mod2 = zeros(1,nsymbol);data_demod1 = zeros(1,nsymbol); data。

2、_demod2 = 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的映射if data(4*i-3)=0 & data(4*i-2)=0data_mod1(i) = 3;if data(4*i-1)=0 & data(4*i)=0 data_mod2(i) = 3;elseif data(4*i-1)=0。

3、 & data(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;endelseif 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;elsei。

4、f 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;endelseif 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)=1 data_m。

5、od2(i) = -1;elseif data(4*i-1)=1 & data(4*i)=0 data_mod2(i) = -3;endelseif 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 data(4*i-1)=1 & d。

6、ata(4*i)=0 data_mod2(i) = -3;endendendSNR_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= 1:10sigma = 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:nsymbolif s_receive1(k)2 data_demod1。

7、(k) = 0;data_demod2(k) = 0; if s_receive2(k)2data_demod3(k) = 0;data_demod4(k) = 0;elseif s_receive2(k)0 & s_receive2(k)-2 & s_receive2(k)0 & s_receive1(k)2data_demod3(k) = 0;data_demod4(k) = 0;elseif s_receive2(k)0 & s_receive2(k)-2 &s_receive2(k)-2 data_demod1(k) = 1;data_demod2(k) = 1; if s_recei。

8、ve2(k)2data_demod3(k) = 0;data_demod4(k) = 0;elseif s_receive2(k)0 & s_receive2(k)-2 & s_receive2(k)2data_demod3(k) = 0;data_demod4(k) = 0;elseif s_receive2(k)0 & s_receive2(k)-2 & s_receive2(k)0data_demod3(k) = 1;data_demod4(k) = 1; elseif s_receive2(k)-2data_demod3(k) = 1;data_demod4(k) = 0;endend。

9、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) + 1;endend enderrorratio(loop) = errornumber(loop)/nsymbol;t = 0.75*erfc(sqrt(3*SNR/30);ser_theory = 1-(1-t).2;%理论误码率，注意 Q 函数和误差函数的对应关系sem。

10、ilogy(SNR_dB,errorratio,-k*,SNR_dB,ser_theory,-ro); title(16QAM 信号在 AWGN 信道下的性能(格雷码)); xlabel(信噪比/dB);ylabel(误码率);legend(误码率,理论误码率); grid on;%坐标线“”“”At the end, Xiao Bian gives you a passage. Minand once said, people who learn to learn are very happy people. In every wonderful life, learning is an e。

11、ternal theme. As a professional clerical and teaching position, I understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. Only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. This document is also edited by my studio professionals, there may be errors in the document, if there are errors, please correct, thank you。