Opportunistic decode-and-forward relaying with beamforming in two-wave with diffuse power fading

Yao Lu*, Nan Yang, Huaiyu Dai, Xiaoxiang Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this paper, we propose new opportunistic decode-and-forward (DF) relaying with beamforming for multirelay networks, where an N s-antenna source communicates with an N d-antenna destination with the aid of N parallel single-antenna relays. Among these relays, only one relay that correctly decodes the signal from the source and has the highest instantaneous signal-to-noise ratio (SNR) to the destination is selected for transmission. The source employs maximum ratio transmission (MRT) to transmit, whereas the destination performs maximum ratio combining (MRC) to the received signals. To examine the benefits of the proposed scheme, we first derive the exact outage probability for independently but nonidentically distributed (i.n.i.d.) two-wave with diffuse power (TWDP) fading channels. We then derive an easy-to-compute expression for the exact outage probability to reduce computational cost. Our results encompass Rayleigh and Rician fading as special cases. We further derive a compact expression for the asymptotic outage probability, which characterizes two factors governing the network performance at high SNRs, i.e., the diversity order and the array gain. We demonstrate that our scheme preserves the maximum diversity order of N × min{N s,N d}. Additionally, we derive the optimal power allocation factor, which provides a practical design rule to optimally distribute the total transmission power between the source and the selected relay to minimize the outage probability.

Original languageEnglish
Article number6220280
Pages (from-to)3050-3060
Number of pages11
JournalIEEE Transactions on Vehicular Technology
Volume61
Issue number7
DOIs
Publication statusPublished - 2012
Externally publishedYes

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