Exact BERs for M-QAM with MRC and channel estimation errors in Rician channels

TitleExact BERs for M-QAM with MRC and channel estimation errors in Rician channels
Publication TypeConference Paper
Year of Publication2005
AuthorsMa, Y., R. Schober, and D. Zhang
Conference NameWireless Communications and Networking Conference, 2005 IEEE
Pagination967 - 972 Vol. 2
Date Publishedmar.
Keywordsarbitrary linear channel estimators, BER, bit error rate, channel estimation, channel estimation errors, correlated diversity branches, diversity reception, error statistics, imperfect channel estimation, least mean squares methods, M-level quadrature amplitude modulation, maximum ratio combining, minimum mean square error channel estimators, MMSE, MRC diversity, pilot-symbol assisted modulation, PSAM, quadrature amplitude modulation, rectangular M-QAM, Rician channels, sinc-interpolator-based channel estimators, square M-QAM, unbalanced diversity branches

In this paper, we study the effect of imperfect channel estimation (ICE) on the performance of M-level quadrature amplitude modulation (M-QAM) with maximum ratio combining (MRC) and pilot-symbol assisted modulation (PSAM) in generalized Rician fading channels. Via a novel formulation of the bit error rate (BER) of M-QAM in terms of the distribution of new decision variables, we derive the exact BER of M-QAM with MRC diversity and channel estimation errors. Our new result is valid for both square and rectangular M-QAM, arbitrary linear channel estimators, and unbalanced and correlated diversity branches in Rician fading. Using our new results, we evaluate the performance of minimum mean square error (MMSE)- and sinc-interpolator-based channel estimators with PSAM, and present some interesting findings.


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