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Power Allocation for OFDM-Based Cooperative Relay Systems
Wu, Victor K. Y.,Li, Ye (Geoffrey),Wylie-Green, Marilynn P.,Reid, Tony,Wang, Peter S. S. The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.2
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.
A Full Rate Dual Relay Cooperative Approach for Wireless Systems
Hassan, Syed Ali,Li, Geoffrey Ye,Wang, Peter Shu Shaw,Green, Marilynn Wylie The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.5
Cooperative relaying methods have attracted a lot of interest in the past few years. A conventional cooperative relaying scheme has a source, a destination, and a single relay. This cooperative scheme can support one symbol transmission per time slot, and is caned full rate transmission. However, existing fun rate cooperative relay approaches provide asymmetrical gain for different transmitted symbols. In this paper, we propose a cooperative relaying scheme that is assisted with dual relays and provides full transmission rate with the same macro-diversity to each symbol. We also address equalization for the dual relay transmission system in addition to addressing the issues concerning the improvement of system performance in terms of optimal power allocations.
A Full Rate Dual Relay Cooperative Approach for Wireless Systems
Syed Ali Hassan,Geoffrey Ye Li,Peter Shu Shaw Wang,Marilynn Wylie Green 한국통신학회 2010 Journal of communications and networks Vol.12 No.5
Cooperative relaying methods have attracted a lot of interest in the past few years. A conventional cooperative relaying scheme has a source, a destination, and a single relay. This cooperative scheme can support one symbol transmission per time slot,and is called full rate transmission. However, existing full rate cooperative relay approaches provide asymmetrical gain for different transmitted symbols. In this paper, we propose a cooperative relaying scheme that is assisted with dual relays and provides full transmission rate with the same macro-diversity to each symbol.We also address equalization for the dual relay transmission system in addition to addressing the issues concerning the improvement of system performance in terms of optimal power allocations.
Power Allocation for OFDM-Based Cooperative Relay Systems
V. K. Y. Wu,Y. G. Li,M. P. Wylie-Green,T. Reid,P. S. S. Wang 한국통신학회 2008 Journal of communications and networks Vol.10 No.2
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 decodeand- 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.