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CLC number: TN914.51

On-line Access: 2010-06-02

Received: 2009-07-05

Revision Accepted: 2009-11-04

Crosschecked: 2010-05-04

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Journal of Zhejiang University SCIENCE C 2010 Vol.11 No.6 P.450-464

10.1631/jzus.C0910405


Centralized and distributed resource allocation in OFDM based multi-relay system


Author(s):  Rui Yin, Yu Zhang, Guan-ding Yu, Zhao-yang Zhang, Jie-tao Zhang

Affiliation(s):  Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China, Wireless Research Department, Huawei Technologies Co., Ltd., Shenzhen 518129, China

Corresponding email(s):   yinrui@zju.edu.cn, yuguanding@zju.edu.cn, ning_ming@zju.edu.cn

Key Words:  Wireless relay network, Orthogonal frequency division multiplexing (OFDM), Relay selection, Convex optimization, Dual method


Rui Yin, Yu Zhang, Guan-ding Yu, Zhao-yang Zhang, Jie-tao Zhang. Centralized and distributed resource allocation in OFDM based multi-relay system[J]. Journal of Zhejiang University Science C, 2010, 11(6): 450-464.

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author="Rui Yin, Yu Zhang, Guan-ding Yu, Zhao-yang Zhang, Jie-tao Zhang",
journal="Journal of Zhejiang University Science C",
volume="11",
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pages="450-464",
year="2010",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C0910405"
}

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%T Centralized and distributed resource allocation in OFDM based multi-relay system
%A Rui Yin
%A Yu Zhang
%A Guan-ding Yu
%A Zhao-yang Zhang
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%J Journal of Zhejiang University SCIENCE C
%V 11
%N 6
%P 450-464
%@ 1869-1951
%D 2010
%I Zhejiang University Press & Springer
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T1 - Centralized and distributed resource allocation in OFDM based multi-relay system
A1 - Rui Yin
A1 - Yu Zhang
A1 - Guan-ding Yu
A1 - Zhao-yang Zhang
A1 - Jie-tao Zhang
J0 - Journal of Zhejiang University Science C
VL - 11
IS - 6
SP - 450
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%@ 1869-1951
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.C0910405


Abstract: 
In the presence of multiple non-regenerative relays, we derived optimal joint power allocation, relay selection, and subchannel pairing schemes in orthogonal frequency division multiplexing (OFDM) based wireless networks. The Lagrange dual method was employed to design the optimal algorithm. First, the optimization problem was formulated for the single-relay system and the optimal centralized algorithm was presented by resolving the dual problem. Next, the optimal algorithm for a multi-relay system was proposed in a similar way. Compared with the exhaustive search method, the computational complexity of the proposed optimal algorithms was reduced from non-polynomial to polynomial time. Finally, the centralized algorithm was extended to the distributed algorithm, which was more feasible for the practical system. Simulation results verify our analysis.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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