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⛄ 内容介绍
现代通信系统中,对于通信距离、容量和质量的要求,调制解调技术是其中的关键技术之一,一直是人们研究的重点和热点。
⛄ 完整代码
x = 1; % signal to transmit Eb = 1
TRIAL = 10000; %number of simulation runs per EbN0 %50000
for EbN0 = 0:1:20 %dB
linear_EbN0 = 10^(EbN0/10); nvar = 1/(linear_EbN0); %calculation of N0, remember Eb = 1
error1 = 0; %set error counter to 0
error2 = 0; %set error counter to 0
error3 = 0; %set error counter to 0
for trial = 1:TRIAL % monte carlo trials.. count the errors
n1 = sqrt(nvar/2)*randn; %noise for the first
n2 = sqrt(nvar/2)*randn; %noise for the first
h1 = sqrt(0.5)*abs(randn + j*randn); %rayleigh amplitude 1
h2 = sqrt(0.5)*abs(randn + j*randn); %rayleigh amplitude 1
%Equal Gain combining
y1 = x*h1+n1; % Signal 1
y2 = x*h2+n2; % Signal 2
y_equal = 0.5*(y1+y2);
%Maximal Ratio combining
a1 = (abs(h1))^2;
a2 = (abs(h2))^2;
y_maximal = x*(a1*h1+a2*h2)+a1*n1+a2*n2;
%Selection combining
P1 = chi2rnd(4);
P2 = chi2rnd(4);
as1 = P1*(abs(h1))^2;
as2 = P2*(abs(h2))^2;
if as1 >= as2
y_selection = x*(as1*h1)+as1*n1;
end
if as1 < as2
y_selection = x*(as2*h2)+as2*n2;
end
if y_equal < 0 %define decision region as 0
error1 = error1 + 1;
end
if y_maximal < 0
error2 = error2 + 1;
end
if y_selection < 0
error3 = error2 + 1;
end
end
BER1(EbN0+1) = error1/(TRIAL);
BER2(EbN0+1) = error2/(TRIAL);
BER3(EbN0+1) = error3/(TRIAL);
end
% plot simulations
figure
EbNo=0:1:20; %changed from 10
mu = 10.^(EbNo./10);
ber_theory = (1/2)*(1 - sqrt(mu ./ (mu + 1)));
semilogy(EbNo,BER1,'r*-',EbNo,BER2,'b--o',EbNo,BER3,'c-o',EbNo,ber_theory,'b'); % plot EG BER vs EbNo
legend('EG','MR','SC','theory');
xlabel('EbNo(dB)') %Label for x-axis
ylabel('Bit error rate') %Label for y-axis
⛄ 运行结果
⛄ 参考文献
[1] 韩英娜. 基于FPGA的空时分组码的设计与实现[D]. 大连海事大学, 2010.
[2] 蔡莉莉, 王进华. 基于Matlab的独立瑞利衰落模型的仿真[J]. 江西通信科技, 2008(2):4.
[3] 刘芳. MATLAB多径衰落对误码率影响的仿真与分析[J]. 大陆桥视野, 2010(06X):2.
[4] 朱黄锁. 基于FPGA的QPSK中频接收机的研究与实现[D]. 西安电子科技大学, 2013.
[5] 马翘楚. 基于Matlab的QPSK系统的设计[D]. 吉林大学.
