DocumentCode :
2062253
Title :
Power Allocation for OFDM Based Links in Hybrid Forward Relay
Author :
Li, Xiaofan ; Zhang, Jianhua ; Zhang, Yanyan ; Huang, Jiangchun
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing
fYear :
2009
fDate :
26-29 April 2009
Firstpage :
1
Lastpage :
5
Abstract :
In this paper, we consider a two-hop orthogonal frequency division multiplexing (OFDM) relay link, and investigate the system capacity in hybrid forward (HF) relay through the power allocation (PA). The expression of the system capacity in HF relay is provided. Two situations about the power constraint are concerned, and under each situation, the selection criterion among different forwarding schemes in HF relay is proposed by means of capacity comparison on the subcarrier pair. From the selection criterions, the source or relay can adaptively choose the best scheme for every subcarrier pair according to the channel condition. Then the optimal solutions of the relay PA and the joint PA are derived to maximize the capacity. In the simulation, the advantage of the HF relay is shown in terms of capacity improvement compared with the conventional forward relay.
Keywords :
OFDM modulation; channel allocation; channel capacity; OFDM based link; channel capacity; hybrid forward relay; orthogonal frequency division multiplexing system; power allocation; Bit error rate; Decoding; Educational technology; Hafnium; Laboratories; OFDM; Power system relaying; Relays; Technological innovation; Time division multiplexing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Conference_Location :
Barcelona
ISSN :
1550-2252
Print_ISBN :
978-1-4244-2517-4
Electronic_ISBN :
1550-2252
Type :
conf
DOI :
10.1109/VETECS.2009.5073810
Filename :
5073810
Link To Document :
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