A new power allocation scheme for amplify and forward incremental relaying
Date
2009
Authors
Tabataba, Foroogh
Sadeghi, Parastoo
Pakravan, Mohammad
Journal Title
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Volume Title
Publisher
Institute of Electrical and Electronics Engineers (IEEE Inc)
Abstract
In this paper, we present a novel power allocation scheme for amplify and forward incremental relaying (IR) systems with the aim to minimize the overall outage probability at the destination. In our problem formulation, we take into account the outage-dependent activation of the relay when writing the power constraint. We provide a simple closed-form solution to the IR power allocation problem that is based on high signal-to-noise (SNR) approximation of the outage probability assuming maximum ratio combining (MRC) at the destination. We investigate the effectiveness of the proposed solution by comparing the achieved outage probabilities with those obtained through global numerical search. We find that the simple closed-form solution is almost optimal in many situations of interest and even at low SNR conditions. We observe that power-optimized IR needs significantly less power than power-optimized fixed relaying to achieve the same outage probability at the same effective rate. Finally, we show that our analytical power optimization for IR-MRC systems is also applicable to IR systems with selection diversity and results in almost optimal outage probability.
Description
Keywords
Keywords: Amplify and forward; Closed form solutions; Low SNR; Maximum ratio combining; Numerical search; Outage probability; Power allocations; Power constraints; Power Optimization; Problem formulation; Selection diversity; Signal to noise; Acoustic intensity; Am
Citation
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Source
Proceedings of IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2009)
Type
Conference paper
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DOI
10.1109/SPAWC.2009.5161834
Restricted until
2037-12-31