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BER for MIMO using MATLAB

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amir_rastegar2003

amir_rastegar2003

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matlab and mimo ber

hi
I have a question about MIMO simulation using MATLAB.

suppose that we have a MIMO sysytem with N transmit antennas and M receiver antennas, and let H be the channek matrix. if we model H as a random matrix H:mxn and each elements belows i.i.d. complex gaussian(0,1), we will have:

Y=Hx+N

N:noise term,

ok, my questioin is: how can we use this model to obtain an BER? (in MATLAB).

If we use" rand(1,1) for each element in H, the BER will vary for each realization of channel matrix.

what do you recommand?? what is the real BER??

thanks all.

plz give me a simple m.file.
 

ber mimo matlab

Hi
Use randn(m,n) for H.
You are right. in fading channel, BER is not constant. so you should average it in time.
 
mimo using matlab

m_llaa said:
Hi
Use randn(m,n) for H.
You are right. in fading channel, BER is not constant. so you should average it in time.
Click to expand...

thanks for your responce,

but how many itretion is enoiugh for obtain an accurate responce?

thanks a lot.
 

www.matlabcentral.com----------> file excahnge

you can find what you want
 

Salam
It is formal in statistic, if your BER in order of
10^(-n) you should average more than 10^(n+1) symbols.
 
amir_rastegar2003 said:
hi

Y=Hx+N

N:noise term,

ok, my questioin is: how can we use this model to obtain an BER? (in MATLAB).

If we use" rand(1,1) for each element in H, the BER will vary for each realization of channel matrix.

what do you recommand?? what is the real BER??
Click to expand...

Sorry I do not have Matlab file for you, but I can answer your questions and hope it helps.

To simulation BER, at least you need to implement an equalizer to remove all inter-antenna crosstalk.

Regarding how many iterations you need, besides the 10^n~10^(n+1) thrumb of rule, we also need to know how fast the BER result converge. Run a long simulation and keep track of all results to find the iterations we actually want.
 
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