MATLAB.rar_BPSK信号加噪_BPSK信号数据_BPSK接收_数据传输_通信信号加噪

1、源信号产生函数： function signal=Source() signal=rand(1,8)=0.5; end 2、BPSK调制函数： function modemsignal=bpskmodulation(signal) signal=signal2-1; fc=1000000; t=linspace(0,0.000001,48); carrier=sin(2pifct); modemsignal=[]; for i=1length(signal) modemsignal=[modemsignal,signal(i)carrier]; end figure plot(modemsignal); title('经过调制后的信号波形'); end 3、高斯白噪声加噪函数： function channelsignal=gussianchannel(signal,srn) channelsignal=awgn(signal,srn); figure plot(channelsignal); title('高斯白噪声影响下的信道信号波形'); end 4、BPSK解调恢复数据函数： function bitstream=demobpsk(channelsignal) load num t=linspace(0,0.000008,384); fc=1000000; carrier=sin(2pitfc); figure plot(carrier); title('载波的波形'); signal0=carrier.channelsignal; signal0=[signal0,zeros(1, fix(length(lowpass2)))] figure plot(signal0); title('乘以载波后的信号') signal1=filter(lowpass,1,signal0); figure plot(signal1); title('通过低通滤波器后波形') IN=fix(length(lowpass)2); bitstream=[]; LL=48; j=IN+LL2; while (j=length(signal1)) bitstream=[bitstream,signal1(j)0]; j=j+LL; end bitstream end 5、主函数： clear all close all srn=30 signal=Source(); signal modemsignal=bpskmodulation(signal); channelsignal=gussianchannel(modemsignal,srn); bitstream=demobpsk(channelsignal); figure subplot(2,1,1) plot(signal) subplot(2,1,2) plot(bitstream)