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about the 16qam demodulation in fading channel

Started by drproflipa December 14, 2005
Dear all, 

When I tried to calculate the BER in flat fading channel of 16QAM signals.
It is found that the the performance very difficult to approach the
theoretical values. But in AWGN the demodulation algorithm works well. I
found BER in fading channel is very sensitive to the Doppler. Any one can
give some direction?

Thanks in advance


Hi ,

It is easy to reach AWGN theoterical results since in AWGN we are just
ADDING the noise while in a fading channel , multiplicative effect is
observed (which is kinda tricky and has higher variance).

I guess if you are doing Monte Carlo simulations, try to average your
BER over more number of iterations.

hope that helps.....



drproflipa wrote:
> Dear all, > > When I tried to calculate the BER in flat fading channel of 16QAM signals. > It is found that the the performance very difficult to approach the > theoretical values. But in AWGN the demodulation algorithm works well. I > found BER in fading channel is very sensitive to the Doppler. Any one can > give some direction? > > Thanks in advance