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EURASIP Journal on Wireless Communications and Networking

, 2008:570624

Multicarrier Systems

Abstract

We propose a joint MAP channel estimation and data detection technique based on the expectation maximization EM method with paralel interference cancelation PIC for downlink multicarrier MC code division multiple access CDMA systems in the presence of frequency selective channels. The quality of multiple access interference MAI, which can be improved by using channel estimation and data estimation of all active users, affects considerably the performance of PIC detector. Therefore, data and channel estimation performance obtained in the initial stage has a significant relationship with the performance of PIC. So obviously it is necessary to make excellent joint data and channel estimation for initialization of PIC detector. The EM algorithm derived estimates the complex channel parameters of each subcarrier iteratively and generates the soft information representing the data a posterior probabilities. The soft information is then employed in a PIC module to detect the symbols efficiently. Moreover, the MAP-EM approach considers the channel variations as random processes and applies the Karhunen-Loeve KL orthogonal series expansion. The performance of the proposed approach is studied in terms of bit-error rate BER and mean square error MSE. Throughout the simulations, extensive comparisons with previous works in literature are performed, showing that the new scheme can offer superior performance.

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Autor: Hakan Doğan - Erdal Panayırcı - Hakan A. Çırpan - Bernard H. Fleury

Fuente: https://link.springer.com/







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