matlab 求份基于m序列和gold序列的直接序列扩频、解扩频模块系统的代码
时间: 2023-08-23 16:07:01 浏览: 77
以下是基于m序列和gold序列的直接序列扩频、解扩频模块系统的 MATLAB 代码示例:
% 生成m序列
mseq = [1 0 0 1 1];
n = 10; % 生成10个码元
for i=1:n
mseq = [mseq mod(sum(mseq([1 2 5])),2)];
end
% 生成gold序列
gold1 = [1 0 0 1]; % 初始序列1
gold2 = [1 1 0 1]; % 初始序列2
n = 10; % 生成10个码元
for i=1:n
gold1 = [gold1 mod(gold1(1)+gold1(4),2)];
gold2 = [gold2 mod(gold2(1)+gold2(3)+gold2(4),2)];
end
goldseq = mod(gold1+gold2,2);
% 待传输数据
data = [1 0 1 1 0 1];
% 直接序列扩频
tx_signal = [];
for i=1:length(data)
if data(i) == 1
tx_signal = [tx_signal mseq];
else
tx_signal = [tx_signal -mseq];
end
end
tx_signal = tx_signal';
% 加入高斯白噪声
snr_db = 10; % 信噪比
snr = 10^(snr_db/10);
noise = sqrt(1/snr)*randn(size(tx_signal));
rx_signal = tx_signal + noise;
% 接收端解扩频
rx_data = [];
for i=1:length(data)
r = rx_signal((i-1)*length(mseq)+1:i*length(mseq));
corr_mseq = sum(r.*mseq);
if corr_mseq > 0
rx_data = [rx_data 1];
else
rx_data = [rx_data 0];
end
end
% 解码
rx_goldseq = [];
for i=1:length(rx_data)
r = rx_signal((i-1)*length(mseq)+1:i*length(mseq));
corr_goldseq = sum(r.*goldseq);
if corr_goldseq > 0
rx_goldseq = [rx_goldseq 1];
else
rx_goldseq = [rx_goldseq 0];
end
end
rx_data = mod(rx_data+rx_goldseq,2);
% 输出结果
disp('待传输数据:');
disp(data);
disp('扩频后信号:');
disp(tx_signal);
disp('加噪后信号:');
disp(rx_signal);
disp('接收到的数据:');
disp(rx_data);
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