BER and optimal power allocation for amplify-and-forward relaying using pilot-aided maximum likelihood estimation

Kezhi Wang, Yunfei Chen, Mohamed-Slim Alouini, Feng Xu

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Bit error rate (BER) and outage probability for amplify-and-forward (AF) relaying systems with two different channel estimation methods, disintegrated channel estimation and cascaded channel estimation, using pilot-aided maximum likelihood method in slowly fading Rayleigh channels are derived. Based on the BERs, the optimal values of pilot power under the total transmitting power constraints at the source and the optimal values of pilot power under the total transmitting power constraints at the relay are obtained, separately. Moreover, the optimal power allocation between the pilot power at the source, the pilot power at the relay, the data power at the source and the data power at the relay are obtained when their total transmitting power is fixed. Numerical results show that the derived BER expressions match with the simulation results. They also show that the proposed systems with optimal power allocation outperform the conventional systems without power allocation under the same other conditions. In some cases, the gain could be as large as several dB's in effective signal-to-noise ratio.
Original languageEnglish (US)
Pages (from-to)3462-3475
Number of pages14
JournalIEEE Transactions on Communications
Volume62
Issue number10
DOIs
StatePublished - Oct 2014

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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