Power allocation for OFDM-based cooperative relay systems

Cooperative relays can provide spatial diversity and improve performance of wireless communications. In this paper, we study subcarrier power allocation at the relays for orthogonal frequency division multiplexing (OFDM)-based wireless systems. For cooperative relay with amplify-and-forward(AF) and...

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Bibliographic Details
Published in:Journal of communications and networks 2008, 10(2), , pp.156-162
Main Authors: Wu, Victor K. Y., Li, Ye, Wylie-Green, Marilynn P., Reid, Tony, Wang, Peter S. S.
Format: Article
Language:English
Subjects:
Cooperative diversity
cooperative relay
Mutual information
Noise
OFDM
power allocation
Receivers
Relays
Resource management
Transmitters
전자/정보통신공학
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Summary:Cooperative relays can provide spatial diversity and improve performance of wireless communications. In this paper, we study subcarrier power allocation at the relays for orthogonal frequency division multiplexing (OFDM)-based wireless systems. For cooperative relay with amplify-and-forward(AF) and decode-and-forward (DF) algorithms, we investigate the impact of power allocation to the mutual information between the source and destination. From our simulation results on word-error-rate (WER) performance, we find that the DF algorithm with power allocation provides better performance than that of AF algorithm in a single path relay network because the former is able to eliminate channel noise at each relay. For the multiple path relay network, however, the network structure is already resistant to noise and channel distortion, and AF approach is a more attractive choice due to its lower complexity.
ISSN:1229-2370
1976-5541
DOI:10.1109/JCN.2008.6389835