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Plz Plz help me in wireless communication

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electronicman

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Hi, I get very challenging question that I have to plot using Matlab the single-user
channel capacity with rayleigh fading how can I do this for range between 0-30 dB
average SNR.The plot is found in Wireless Communications P.114,115.I did all my best ,but there was not any matchs between my results and the book's.
How can I chose the best standard deviation that will give m the highest capacity for the channel.Please any help books,lecture notes,Matlab source code.....any thing even your sugestion.

What is the average SNR?
What is the CSI?
How can I implement Rayleigh or any distribution (Nagakami-m)in matlab?
 

Hi electronicman
I didnt see your book, but becareful about this.
Rayleigh fading coefficien with unit variance:
h = sqrt(0.5)*randn + j*sqrt(0.5)*randn
Complex noise with variance N0:
sigma = sqrt(N0/2)
n = sigma*randn + j*sigma*randn
I hope this help u, If u want more, I can help u
 

CSI is the "channel state Information".

based on the amount of CSI, the channel capacity varies.

yu ca use "rayleighchan" and "ricianchan" MATLAB commands.

regards. ( if this helped you plz press"Helped me")
thanks.
 

>What is the average SNR?

Average SNR is the expectation of the receiver SNR, which is generally a random variable due to the fluctuation of channel strength.

>What is the CSI?

CSI stands for "channel state information." It might change the channel capacity. (The exception is the power limited regime where your bandwidth is very large. In this case, non-coherent schemes suffice.)


>How can I implement Rayleigh or any distribution >(Nagakami-m)in matlab?

If you only need to plot channel capcity in the ergodic sense (by averaging over channel fadings), you can simply user h=randn + j*randn; (with certain normalization of power) to model Rayleigh fading.
 

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