相干移频键控,非相干移频键控,锐利衰落信道下非相干移频键控性能曲线.docx

1：相干移频键控，非相干移频键控，锐利衰落信道下非相干移频键控性能曲线源程序：clear clc x = 0:1:20; %信噪比变化范围 SNR = 10.(x/10); %SNR即Es/NoPe_1 = 0.5*erfc(sqrt(SNR/2); %相干移频Pe_2 = 0.5*exp(-SNR/2); %非相干（无衰落）Pe_3 = 1./(2+SNR); %非相干（瑞利衰落） figure(1) %作图subplot(3,1,1)plot(x,Pe_1,b)xlabel(Es/No(dB);ylabel(Pe);title(三种不同情况的错误概率曲线);grid on;subplot(3,1,2)plot(x,Pe_2,r)xlabel(Es/No(dB);ylabel(Pe);grid on;subplot(3,1,3)plot(x,Pe_3,g)xlabel(Es/No(dB);ylabel(Pe);grid on; figure(2) %对数坐标subplot(3,1,1)semilogx(SNR,Pe_1,b)xlabel(Es/No(dB);ylabel(Pe);title(三种不同情况的错误概率曲线);grid on;subplot(3,1,2)semilogx(SNR,Pe_2,r)xlabel(Es/No(dB);ylabel(Pe);grid on;subplot(3,1,3)semilogx(SNR,Pe_3,g)xlabel(Es/No(dB);ylabel(Pe);grid on; 2:2PSK调制信号在高斯信道下的性能曲线并与理论结果相比源程序：clear clc%BPSk调制解调在高斯信道下的仿真 %M = 2; %2PSK transmit_bit_length = 30000; %传输比特数transmit_bit = randint(transmit_bit_length,1,M); %产生二进制数据signal = transmit_bit;mod_1 = modem.pskmod(M); %产生调制信号modsignal = modulate(mod_1,signal); %BPS调制 SNR = 0:1:10; %信噪比变化范围 for i = 1:length(SNR) transmit_signal = awgn(modsignal,SNR(i),measured); %加高斯噪声 demod_1 = modem.pskdemod(M); 产生解调信号 receive_signal = demodulate(demod_1,transmit_signal) %BPSK解调 receive_bit = receive_signal; number_of_errors(i),bit_error_rate(i) =biterr(transmit_bit,receive_bit) %计算误比特率end Pe_error1 = 0.5*erfc(sqrt(SNR); Eb_N0=10.(SNR/10); % Pe_error2 = 1/2/sqrt(pi*SNR)*exp(-SNR); %画出误比特率曲线figure(1)semilogy(SNR,bit_error_rate,-*)grid onhold onsemilogy(SNR,P