How to implement multipath fading channels using Phased Array System toolbox?

Hi,

I am currently using the phased.Radiator, phased.FreeSpace and phased.Collector system objects from Phased Array System Toolbox for transmission and reception. Similar to the End-to-End radar system as in this example: http://www.mathworks.de/de/help/phased/gs/end-to-end-radar-system.html

Is it possible to combine this with the 'rayleighchan' or 'ricianchan' available from Communications System toolbox? I want to add frequency selective multipath behavior to the Free Space environment. Maybe my approach is wrong. Please correct me in this case. Any ideas on how to implement this?

Thanks, Jenny

Answer 1

[Honglei Chen]

In theory you should be able to cascade the two channels together. The FreeSpace channel in Phased Array System Toolbox basically models the large scale fading yet rayleighchann models the small scale fading. Here is a simple result with some randomly selected parameters. I hope this can be helpful to you.

myWav = phased.RectangularWaveform('PulseWidth',1e-5);
myChannel1 = phased.FreeSpace;
myChannel2 = rayleighchan(1/myWav.SampleRate,100);
myChannel2.PathDelays = [0 2e-5 5e-5];
N = round(myWav.SampleRate/myWav.PRF);
t = (0:(N-1))/myWav.SampleRate;
x = step(myWav);
xt = step(myChannel1,x,[0;0;0],[2000;0;0],[0;0;0],[0;0;0]);
xt = filter(myChannel2,xt);
figure;
subplot(211); plot(t,abs(x));
subplot(212); plot(t,abs(xt));