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Effect of channel estimation errors on M-QAM with GSC diversity in fading channels

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3 Author(s)
Yao Ma ; Dept. of ECpE, Iowa Univ., Iowa City, IA, USA ; Dongbo Zhang ; Schober, R.

In this paper, we study the effect of imperfect channel estimation (ICE) on the performance of M-level quadrature amplitude modulation (M-QAM) with generalized selection combining (GSC) diversity and pilot-symbol assisted modulation (PSAM) in several types of fading channels (including Rayleigh, Rician and Nakagami fading). We provide a novel formulation of the bit error rate (BER) of M-QAM with ICE in terms of the signal-constellation-dependent effective signal-to-noise ratio (SNR), which allows us to derive the accurate BER results of square and rectangular M-QAM with GSC and channel estimation errors. Our new BER expressions are general and yet easy to evaluate, and simplify to a closed-form expression for the Rayleigh fading case. Using our new analytical result, we evaluate the performance of M-QAM with PSAM, and present some interesting findings.

Published in:

Communications, 2005. ICC 2005. 2005 IEEE International Conference on  (Volume:4 )

Date of Conference:

16-20 May 2005