使用matlab编写2psk、qpsk、8psk的调制解调,并绘制调制解调波形图、频谱图、星座图、蒙特卡罗仿真
时间: 2023-09-18 16:10:36 浏览: 944
由于这是一项较为复杂的任务,我将提供大致的步骤和代码框架,但具体的实现细节需要您自行完成。
1. 生成随机比特序列:
```matlab
M = 2; % 调制方式
N = 10000; % 比特序列长度
dataIn = randi([0 M-1],N,1);
```
2. 将比特序列映射到调制符号:
```matlab
if M == 2 % 2PSK
dataMod = pskmod(dataIn,M);
elseif M == 4 % QPSK
dataMod = pskmod(dataIn,M,sqrt(2)/2);
elseif M == 8 % 8PSK
dataMod = pskmod(dataIn,M,sqrt(2/3));
end
```
3. 添加高斯白噪声:
```matlab
EbNo = 10; % 信噪比
snr = EbNo + 10*log10(k) - 10*log10(log2(M));
dataRx = awgn(dataMod,snr,'measured');
```
4. 解调接收到的信号:
```matlab
if M == 2 % 2PSK
dataOut = pskdemod(dataRx,M);
elseif M == 4 % QPSK
dataOut = pskdemod(dataRx,M,sqrt(2)/2);
elseif M == 8 % 8PSK
dataOut = pskdemod(dataRx,M,sqrt(2/3));
end
```
5. 绘制调制解调波形图:
```matlab
figure;
subplot(2,1,1);
plot(real(dataMod));
title('Modulated Signal');
subplot(2,1,2);
plot(real(dataRx));
title('Received Signal');
```
6. 绘制调制解调频谱图:
```matlab
figure;
subplot(2,1,1);
pspectrum(dataMod);
title('Modulated Signal Spectrum');
subplot(2,1,2);
pspectrum(dataRx);
title('Received Signal Spectrum');
```
7. 绘制星座图:
```matlab
if M == 2 % 2PSK
scatterplot(dataMod);
elseif M == 4 % QPSK
scatterplot(dataMod);
elseif M == 8 % 8PSK
scatterplot(dataMod);
end
```
8. 蒙特卡罗仿真:
```matlab
numBits = 1e6; % 模拟的比特序列数
EbNoVec = 0:2:16; % 信噪比向量
berVec = zeros(size(EbNoVec)); % 存储误比特率
for n = 1:length(EbNoVec)
EbNo = EbNoVec(n);
snr = EbNo + 10*log10(k) - 10*log10(log2(M));
% 模拟numBits个比特序列
dataIn = randi([0 M-1],numBits,1);
dataMod = pskmod(dataIn,M);
dataRx = awgn(dataMod,snr,'measured');
dataOut = pskdemod(dataRx,M);
% 计算误比特率
berVec(n) = sum(dataIn~=dataOut)/numBits;
end
figure;
semilogy(EbNoVec,berVec,'-*');
xlabel('Eb/No (dB)');
ylabel('Bit Error Rate');
title('Bit Error Rate for PSK Modulation');
```
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