Outage analysis and optimal power allocation for multinode relay networks

Author

Seddik, Karim G. ; Sadek, Ahmed K. ; Su, Weifeng ; Liu, K. J Ray

Author_Institution

Dept. of Electr. & Comput. Eng., Maryland Univ., College Park, MD

Volume

14

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

377

Lastpage

380

Abstract

In this letter, a novel approach for outage probability analysis of the multinode amplify-and-forward relay network is provided. It is shown that the harmonic mean of two exponential random variables can be approximated, at high signal-to-noise ratio (SNR), to be an exponential random variable. The single relay case considered before is a special case of our analysis. Based on that approximation, an outage probability bound is derived which proves to be tight at high SNR. Based on the derived outage probability bound, optimal power allocation is studied. Simulation results show a performance improvement, in terms of symbol error rate, of the optimal power allocation compared to the equal power-allocation scheme

Keywords

probability; radio networks; signal processing; exponential random variables; multinode amplify-forward relay network; optimal power allocation; outage probability analysis; single relay; Decoding; Degradation; Digital relays; Error analysis; Fading; Frequency diversity; Power system relaying; Random variables; Signal to noise ratio; Wireless application protocol; Amplify-and-forward protocol; outage probability; wireless relay networks;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2006.888424

Filename

4202626