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BER for BPSK in Rayleigh channel



12 Aug 2008 (Updated )

Simulates the BER for BPSK modulation in Rayleigh channel

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Simple Matlab example simulating a BPSK transmission and reception in Rayleigh channel. The script performs the following

(a) Generate random binary sequence of +1’s and -1’s.

(b) Multiply the symbols with the channel and then add white Gaussian noise.

(c) At the receiver, equalize (divide) the received symbols with the known channel

(d) Perform hard decision decoding and count the bit errors

(e) Repeat for multiple values of and plot the simulation and theoretical results.

The theoretical description provided in

MATLAB release MATLAB 7 (R14)
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Comments and Ratings (8)
21 Feb 2014 Soniya Kapur

This code helped me a lot... But I want to confirm if we add some shadowing to this code, will it effect the BER Curve

04 Dec 2011 Merlyn

Ah nevermind, the error goes to zero (off the graph)

04 Dec 2011 Merlyn

How do you create a complete graph when using less than 10^6 transmitted bits? If I change to anything else, it truncates the graph at 1/N. I am doing this to show that when the number of bits is low the simulated and theoretical curves diverge.

09 Jul 2011 jiang

i have tried to realize the simulation of qpsk with rayleigh channel by mutiplying h first,then mutiply conj(h)/abs(h) ,then hard deciding the result with a constellation abs(h) of the orignal one. but the result is not so good .can you help me explain it?

13 Jan 2010 kirankumar palthi

Hi krishna,

I gone through your code. It works. When I am encoding the tx'er bits using (convolution encoding) or Spreading or both I'm unable to get the curve same as theoretical.

15 Aug 2008 R Random

@Pillai. I have to admit that you're right. What I forgot is the fact that the additive noise is also divided by the channel.

15 Aug 2008 Krishna Pillai

@random: May I suggest that your observation is incorrect. Even when we know the channel, and divide the received symbol by the known channel, the resultant noise term is no longer white. Hence it is not comparable to AWGN channel. Further, in the Matlab code the BER obtained from simulations are shown to be matching the theoretically expected results.

14 Aug 2008 R Random

Once you divide the received signal by the known channel you have removed the impact of the channel totally. In other words, it is the same as an AWGN channel, and there is no fading in the model.

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