matlab 怎么改变8QAM的星座映射方式
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解决时间 2021-12-28 02:12
- 提问者网友：你独家记忆
- 2021-12-27 22:03
matlab 怎么改变8QAM的星座映射方式
最佳答案
- 五星知识达人网友：有你哪都是故乡
- 2022-01-10 05:07
% Create a random digital message
M = 16; % Alphabet size
x = randi([0 M-1],5000,1); % Random symbols
% Use 16-QAM modulation.
hMod = modem.qammod(M);
hDemod = modem.qamdemod(hMod);
% Create a scatter plot and show constellation
scatterPlot = commscope.ScatterPlot('SamplesPerSymbol',1,...
'Constellation',hMod.Constellation);
scatterPlot.PlotSettings.Constellation = 'on';
% Modulate
y = modulate(hMod,x);
% Transmit signal through an AWGN channel.
ynoisy = awgn(y,15,'measured');
% Create scatter plot from noisy data.
update(scatterPlot,ynoisy);
% Demodulate ynoisy to recover the message.
z=demodulate(hDemod,ynoisy);
% Check symbol error rate.
[num,rt] = symerr(x,z)
The output and scatter plot follow. Your numerical results and
plot might vary, because the example uses random numbers.
num =
83
rt =
0.0166
M = 16; % Alphabet size
x = randi([0 M-1],5000,1); % Random symbols
% Use 16-QAM modulation.
hMod = modem.qammod(M);
hDemod = modem.qamdemod(hMod);
% Create a scatter plot and show constellation
scatterPlot = commscope.ScatterPlot('SamplesPerSymbol',1,...
'Constellation',hMod.Constellation);
scatterPlot.PlotSettings.Constellation = 'on';
% Modulate
y = modulate(hMod,x);
% Transmit signal through an AWGN channel.
ynoisy = awgn(y,15,'measured');
% Create scatter plot from noisy data.
update(scatterPlot,ynoisy);
% Demodulate ynoisy to recover the message.
z=demodulate(hDemod,ynoisy);
% Check symbol error rate.
[num,rt] = symerr(x,z)
The output and scatter plot follow. Your numerical results and
plot might vary, because the example uses random numbers.
num =
83
rt =
0.0166
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