tailieunhanh - Báo cáo hóa học: " Average bit error probability for the l-MRC detector under Rayleigh fading"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Average bit error probability for the l-MRC detector under Rayleigh fading | Inga and Fraidenraich EURASIP Journal on Wireless Communications and Networking 2011 2011 166 http content 2011 1 166 EURASIP Journal on Wireless Communications and Networking a springeropen Journal RESEARCH Open Access Average bit error probability for the l-MRC detector under Rayleigh fading Mitchell Omar Calderon Inga and Gustavo Fraidenraich Abstract In this paper an exact expression for the average bit error probability was obtained for the l-MRC detector proposed in Sendonaris et al. IEEE Trans Commun 51 1927-1938 IEEE Trans. Commun 51 1939-1948 under Rayleigh fading channel. In addition a very accurate approximation was obtained to calculate the average bit error probability for any power allocation scheme. Our expressions allow to investigate the possible gains and situations where cooperation can be beneficial. Keywords User cooperation Virtual MIMO Bit error probability Rayleigh fading I. Introduction Diversity techniques have been widely accepted as one of effective ways of combat multipath fading in wireless communications 1 in particular spatial diversity is specially effective at mitigating these multipath situation. However in many wireless applications the use of multiple antennas is not practical due to size and cost limitations of the terminals. One possible way to have diversity without increasing the number of antennas is through the use of cooperative diversity. Cooperative diversity has root in classical information theory work on relay channels 2 3 . Cooperative networks achieve diversity gain by allowing the users to cooperate and thus each wireless user is assumed to transmit data as well as act as a cooperative agent for another user 4 5 . The first implementation strategy for cooperation was introduced in 1 6 where the achievable rate region outage probability and coverage area were analyzed. In this pioneering work assuming a suboptimal receiver called l-MRC the bit error probability was computed assuming a fixed

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