Alamouti MIMO simulation works with PSK but not QAM?
- From: "rayzor" <rayzchiew@xxxxxxxxxxx>
- Date: Thu, 28 Aug 2008 13:04:03 -0500
Dear All,
I'm currently simulating a Alamouti MIMO system to find out the BER for
the different number of antennas and different modulation schemes over the
Rayleigh fading channel with AWGN for the selected SNR range.
I've been using the predefined "modem.pskmod" and "modem.qammod" in matlab
for my modulation, demodulation and maximum likelihood decoding. All is
working well for the PSK modulation system but not so for the QAM system.
When there is no noise in the system, the PSK modulation schemes gave me 0
BER for the entire SNR range (which is correct) but the QAM modulation
schemes starting from 8-QAM onwards (same for 16-QAM and 64-QAM) gave me a
random BER values.
I hope someone would enlighten me on this matter and your assistance would
be greatly appreciated.
Thank You
Regards,
Rayzor
.
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