信道仿真的很好程序，可以实现不同参数情况下的信道仿真，比如超宽带系统的室内多径环境信道仿真 - matlab通信信号

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标题：信道仿真的很好程序，可以实现不同参数情况下的信道仿真，比如超宽带系统的室内多径环境信道仿真
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所属分类: 通信信号资源类型：程序源码文件大小: 7.75 KB 上传时间: 2019-06-16 16:12:46 下载次数: 8 资源积分：1分提供者: zhangsan456 code

内容：
信道仿真的很好程序，可以实现不同参数情况下的信道仿真，比如超宽带系统的室内多径环境信道仿真

clear

%Gayatari Prabhu and P. M. Shankar

%loggen1.m

%generates a lognormally faded signal with multipaths (10) and multiple scattering (5)

%iterated 1000 times to see of the mean is lognormally distributed.

%gives the chi-squate test value as well

close all

numscat = 8; %number of scatterers

numpaths = 10; %number of paths

Fc = 900e6; %carrier frequency

Fs = 4*Fc; %sampling frequency

Ts = 1/Fs; %sampling period

t = [0:Ts:4999*Ts]; %time array

wc = 2*pi*Fc; %radian frequency

v = 1; %vehicle speed in m/s

bins = 20; %bins for chi-square test

numit = 2000; %number of iterations for Rayleigh

meanval = 0;

for i = 1:numit

ray = zeros(1,length(t)); %received signal

for j = 1:numpaths

wd = 2*pi*v*Fc*cos(unifrnd(0,2*pi))/3e8;

a = prod(raylrnd(1,1,numscat));

ray = ray + a*cos((wc+wd)*t+unifrnd(0,2*pi,1,length(t)));

end;

[rayi rayq] = demod(ray,Fc,Fs,'qam'); %demodulated signal

env_ray = sqrt(rayi.^2+rayq.^2); %envelope of received signal

meanval(i) = mean(env_ray); % mean of Rayleigh envelope

end;

y=sort(meanval./mean(meanval));%mean of y has been made equal to 1

sig=sqrt(log(std(y)^2+1));%parameter sigma for lognormal....... mean of y has been made equal to 1 (inside the bracket)

mu=-sig^2/2; %second parameter for lognormal

fylog=lognpdf(y,mu,sig);% theoretical lognormal pdf d on the data

[h xx]=hist(y,40);%histogram

plot(y/max(y),fylog/max(fylog),'r')

xlabel('Envelope r');

ylabel('Probability density function f(r)');

hold on

plot(xx/max(xx),h/max(h),'k-.')

chi_square=logtest(y,20)%chi square test

文件列表（点击上边下载按钮，如果是垃圾文件请在下面评价差评或者投诉）:

信道仿真/
信道仿真/loggen1.m
信道仿真/logtest.m
信道仿真/nakatest.m
信道仿真/normtest.m
信道仿真/raygen.m
信道仿真/rayrice.m
信道仿真/raytest.m
信道仿真/ricegen.m
信道仿真/ricetest.m

关键词：信道仿真

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