Performance Analysis of Maximum Ratio Combining with Imperfect Channel Estimation in the Presence of Cochannel Interferences



Kyung Seung Ahn and Robert W. Heath Jr.


IEEE Transactions on Wireless Communications, vol. 8, no. 3, pp. 1080-1085, March 2009.


In this paper, we calculate the average symbol error rate (SER) and the outage probability for maximum ratio combining (MRC) with imperfect channel estimation in the presence of cochannel interferences (CCI) with equal- and unequal-power interference-to-noise ratio (INR). The maximum combining weights are the imperfect estimates of the desired user's fading channel coefficients and are assumed to be complex Gaussian distributed. The quantified measure for estimation error is the correlation coefficient between the true fading channel coefficients and their estimates. Exact closed-form expressions for the signal-to-interference-plus-noise ratio (SINR) distribution, their outage probability, and the average SER for pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM), and phase shift keying (PSK) with M-ary signaling are derived for both equal- and unequal-power CCI. We also provide an upper-bound for the average SER using the moment generating function (MGF) of the SINR. Simulation results demonstrate the accuracy of our theoretic analysis.

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