Joint power allocation and subcarrier pairing in OFDM-based cooperative relaying system

doi:10.1016/S1005-8885(11)60223-9

Acta Metallurgica Sinica(English letters) ›› 2012, Vol. 19 ›› Issue (1): 24-30.doi: 10.1016/S1005-8885(11)60223-9

• Wireless • Previous Articles Next Articles

Joint power allocation and subcarrier pairing in OFDM-based cooperative relaying system

Chongqing Key Lab of Mobile Communication Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Received:2011-06-10 Revised:2011-10-25 Online:2012-02-28 Published:2012-02-21
Contact: Cui-Qin DAI E-mail:daicq@cqupt.edu.cn
Supported by:
This work was supported by the National Key Technology R&D Program (2008BAH30B10), the National Natural Science Foundation of China (60972070), the Chongqing Municipal Science & Technology Development Program, China (CSTC2010A-C2143), the Natural Science Foundation of Chongqing, China (CSTC2009B-A2090).

Abstract

Abstract:

This paper proposes rate-maximized (MR) joint subcarrier pairing (SP) and power allocation (PA) (MR-SP&PA), a novel scheme for maximizing the weighted sum rate of the orthogonal-frequency-division multiplexing (OFDM) relaying system with a decode-and-forward (DF) relay. MR-SP&PA is based on the joint optimization of both SP and power allocation with total power constraint, and formulated as a mixed integer programming problem in the paper. The programming problem is then transformed to a convex optimization problem by using continuous relaxation, and solved in the Lagrangian dual domain. Simulation results show that MR-SP&PA can maximize the weighted sum rate under total power constraint and outperform equal power allocation (EPA) and proportion power allocation (PCG).

Key words:

OFDM, DF relaying, power allocation, SP, MR-SP&PA

CLC Number:

TN929.5

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Joint power allocation and subcarrier pairing in OFDM-based cooperative relaying system

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