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

TitleEffect of channel estimation errors on M-QAM with GSC diversity in fading channels
Publication TypeConference Paper
Year of Publication2005
AuthorsMa, Y., D. Zhang, and R. Schober
Conference NameCommunications, 2005. ICC 2005. 2005 IEEE International Conference on
Pagination2190 - 2194 Vol. 4
Date Publishedmay.
KeywordsBER, bit error rate, channel estimation, channel estimation error, diversity reception, error statistics, generalized selection combining, GSC diversity, imperfect channel estimation, M-QAM, Nakagami fading channel, pilot-symbol assisted modulation, quadrature amplitude modulation, Rayleigh channels, Rayleigh fading channel, Rician channels, Rician fading channel, signal-to-noise ratio

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.


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