Rayleigh channel......

Dear friends..

I need Rayleigh channel function program for WLAN high datarate application urgently... I simply generated random matrix with 0 mean and variance 1 i.e AWGN... But my supervisor want Rayleigh channel in MY MIMO system...

Can you pls help .......urgent

I would recommend mathwork.com for that enquiry.
They have many user contribuited examples for
simulation in Matlab of Rayleigh channels.

Anybody please add rayleigh channel to the below program … to make it work in rayleigh flat fading channel environment ----pls very urgent because I need to submit very soon …..
Note : application of the program is for WLAN ( 802.11) and make some assumption no problem for me…. I need this program with rayleigh one…

clear
S=10000; % length of data
N=6; % assume M tx and N rx antennas (N>M)
M=4;
bsic=[];bzf=[];bmm=[];
data=randint(S,1,4) ; %generates an M-by-N matrix of random integers %
smod=qammod(data,4) ; %outputs the complex envelope of the modulation of the
% message signal X using - 4QAM%
for snr=0:4:25
rec=[];rzf=[];rmm=[];
a=10^(-snr/10);
for i=1:M:S
s=smod(i:i+M-1);
h1=randn(N,M,1);%randn function generates arrays of random numbers
%whose elements are normally distributed with mean 0, variance =1%
h=h1;
ref=1:M;
x=h*s; %data without noise
x=awgn(x,snr,'measured');% received data with noise
zf=pinv(h)*x;%zf equalizer
mm=inv(a.*eye(M,M)+h'*h)*h'*x;%mmse equalizer

rzf=[rzf qamdemod(zf,4)'];
rmm=[rmm qamdemod(mm,4)'];
end
[b1,b2]=symerr(data',rzf);
bzf=[bzf b2];
[b1,b2]=symerr(data',rmm);
bmm=[bmm b2];
end
semilogy(0:4:25,bmm,'blue');
hold on
semilogy(0:4:25,bzf,'green');
grid on
legend('bmm','bzf');
ylabel('Symbol Error Rate');
xlabel('SNR in dB');

need EDA help urgently....

Hi,

User zero mean and unit variance for Rayleigh fading in your MATLAB program. To be specific where you are definifng h as:

h = randn (N,M,1);

use here

h = randn(0,1,?); I am not sure what is third parameter you r defining,

I hope this will work, if you need any more help plz let me know.

Cheers!!!!

MAK

Thanks mkhan

The above program is belong to AWGN channel..... I need ur help to add Rayleigh channel to the program.... I don't know what to do?... Can u help me?

Hi,

vkekk said:

Thanks mkhan

The above program is belong to AWGN channel..... I need ur help to add Rayleigh channel to the program.... I don't know what to do?... Can u help me?

Click to expand...

Yes i may be able to help you. Plz tell me your exact problem. about Rayleigh channel I already told you the scenario.

MAK

Hi,
I think its good to use help in Matlab window, there is a command called CHAN = RAYLEIGHCHAN(TS, FD)and also you can add the paths number.
Or rewrite your program to me with opposit explenation in order to understand your syntaxes, and command to be able to insert the Rayleigh fading to your program
Good luck
sh,

Hi,
Replacing h1=randn(N,M,1) by h1=randn(N,M,1)+sqrt(-1) randn(N,M,1)

HI all,
I am a student in Electrical engineering and I need to simulate Rayleigh environment too, but before that, I have a question on the zero mean and unit variance::

mkhan said:

zero mean and unit variance for Rayleigh fading in your MATLAB program.
MAK

Click to expand...

Is the mean value of the gain in dB or just a ratio (multiplier) to the transmitted power?
and could anyone please give me a clue on normalization to 'unit variance'?

Thank you

anyone please help me?

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