100字范文 > 基于MATLAB的自适应调制解调通信系统的误码率仿真对比BPSK QPSK 16QAM 64QAM

基于MATLAB的自适应调制解调通信系统的误码率仿真对比BPSK QPSK 16QAM 64QAM

时间：2024-08-17 15:13:42

1.算法仿真效果

2.MATLAB核心程序

3.算法涉及理论知识概要

4.完整MATLAB

1.算法仿真效果

matlaba仿真结果如下：

2.MATLAB核心程序

.......................................................................load dat.mat%传输SNRdB = 0:5:30; SER_matrix = zeros(5,length(SNRdB)); Ttotal_matrix = zeros(5,length(SNRdB)); for i = 1:5for j = 1:length(SNRdB)[i,j][temp1,temp2]= TransmissionEffectFun(dats,SNRdB(j),i);SER_matrix(i,j) = temp1;Ttotal_matrix(i,j) = temp2;endendfiguresubplot(231)semilogy(SNRdB,SER_matrix(1,:),'-bs',...'LineWidth',1,...'MarkerSize',8,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.9,0.0]);legend('BPSK');xlabel('SNR');ylabel('误码率');grid onsubplot(232)semilogy(SNRdB,SER_matrix(2,:),'-mo',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.5,0.9,0.0]);legend('QPSK');xlabel('SNR');ylabel('误码率');grid onsubplot(233)semilogy(SNRdB,SER_matrix(3,:),'-b^',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.2,0.9,0.5]);legend('16QAM');xlabel('SNR');ylabel('误码率');grid onsubplot(234)semilogy(SNRdB,SER_matrix(4,:),'-r>',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.9,0.0]);legend('64QAM');xlabel('SNR');ylabel('误码率');grid onsubplot(235)semilogy(SNRdB,SER_matrix(5,:),'-r<',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.3,0.3]);grid onlegend('自适应调制');xlabel('SNR');ylabel('误码率');figuresemilogy(SNRdB,SER_matrix(1,:),'-bs',...'LineWidth',1,...'MarkerSize',8,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.9,0.0]);hold onsemilogy(SNRdB,SER_matrix(2,:),'-mo',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.5,0.9,0.0]);hold onsemilogy(SNRdB,SER_matrix(3,:),'-b^',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.2,0.9,0.5]);hold onsemilogy(SNRdB,SER_matrix(4,:),'-r>',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.9,0.0]);hold onsemilogy(SNRdB,SER_matrix(5,:),'-r<',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.3,0.3]);grid onlegend('BPSK','QPSK','16QAM','64QAM','自适应调制');xlabel('SNR');ylabel('误码率');figureplot(SNRdB,Ttotal_matrix(1,:),'-bs',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.0,0.0]);hold onplot(SNRdB,Ttotal_matrix(2,:),'-mo',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.5,0.9,0.0]);hold onplot(SNRdB,Ttotal_matrix(3,:),'-b^',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.2,0.9,0.5]);hold onplot(SNRdB,Ttotal_matrix(4,:),'-r>',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.9,0.0]);hold onplot(SNRdB,Ttotal_matrix(5,:),'-r<',...'LineWidth',1,...'MarkerSize',6,...'MarkerEdgeColor','k',...'MarkerFaceColor',[0.9,0.3,0.3]);grid onlegend('BPSK','QPSK','16QAM','64QAM','自适应调制');xlabel('SNR');ylabel('传输时间');A416

3.算法涉及理论知识概要

BPSK：Binary Phase Shift Keying 二相相移键控,一个符号代表1bit

QPSK：Quadrature Phase Shift Keying 四相相移键控，一个符号代表2bit

8PSK：8 Phase Shift Keying 八相相移键控，一个符号代表3bit

16QAM：16 Quadrature Amplitude Modulation 16正交幅相调制，一个符号代表4bit

64QAM：64 Quadrature Amplitude Modulation 64正交幅相调制，一个符号代表6bitPSK是相移键控（Phase Shift Keying），是通过相位的变化代表“0”和“1”的。BPSK中的B是“Binary”的意思，也就是有两个变化状态，比如说相位上的“+90°（代表1）、-90°（代表0）”，一个状态代表的就是一个比特。QPSK的“Q”是“Quadrature”的意思，有四个变化状态，如相位上的“+45°（代表00）、-45°（代表11）、+135°（代表10）、-135°（代表01）”，那么一个状态就代表两个比特的信息，如图2所示。同理8PSK的一个状态代表三个比特。

等到QAM调制方式的时候，由于要描述的状态多了，只靠相位区分状态就不够了（相互区别起来有些困难了），需要加入幅度的变化来表示一个状态。16QAM就是状态空间为16，每个状态是4个比特的信息；而64QAM的状态空间是64，每个状态是6个比特的信息.