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

目录

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

matlab2022a仿真结果如下:

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_第1张图片

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_第2张图片

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_第3张图片

 

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 = 1:5
    for j = 1:length(SNRdB)
         [i,j]
        [temp1,temp2]      = TransmissionEffectFun(dats,SNRdB(j),i);
        SER_matrix(i,j)    = temp1;
        Ttotal_matrix(i,j) = temp2;
    end
end


figure
subplot(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 on

subplot(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 on

subplot(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 on

subplot(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 on


subplot(235)
semilogy(SNRdB,SER_matrix(5,:),'-r<',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.3,0.3]);
grid on
legend('自适应调制');
xlabel('SNR');
ylabel('误码率');


figure
semilogy(SNRdB,SER_matrix(1,:),'-bs',...
    'LineWidth',1,...
    'MarkerSize',8,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.9,0.0]);
hold on
semilogy(SNRdB,SER_matrix(2,:),'-mo',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.5,0.9,0.0]);
hold on
semilogy(SNRdB,SER_matrix(3,:),'-b^',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.2,0.9,0.5]);
hold on
semilogy(SNRdB,SER_matrix(4,:),'-r>',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.9,0.0]);
hold on
semilogy(SNRdB,SER_matrix(5,:),'-r<',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.3,0.3]);
grid on
legend('BPSK','QPSK','16QAM','64QAM','自适应调制');
xlabel('SNR');
ylabel('误码率');

figure
plot(SNRdB,Ttotal_matrix(1,:),'-bs',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.0,0.0]);
hold on
plot(SNRdB,Ttotal_matrix(2,:),'-mo',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.5,0.9,0.0]);
hold on
plot(SNRdB,Ttotal_matrix(3,:),'-b^',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.2,0.9,0.5]);
hold on
plot(SNRdB,Ttotal_matrix(4,:),'-r>',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.9,0.0]);
hold on
plot(SNRdB,Ttotal_matrix(5,:),'-r<',...
    'LineWidth',1,...
    'MarkerSize',6,...
    'MarkerEdgeColor','k',...
    'MarkerFaceColor',[0.9,0.3,0.3]);
grid on
legend('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.

4.完整MATLAB

V

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