Single parameter optimization approach to the optimal power allocation of OFDM relaying system

Authors:
Yingnan Zhang;Qiao Wang
Affiliations:
School of Information Science and Engineering, Southeast University, China;School of Information Science and Engineering, Southeast University, China
Venue:
ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
Year:
2009

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On the optimal power control of parallel OFDM relaying networks

GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications

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Abstract

In this paper, we investigate the power allocation optimization problem for dual-hop nonregenerative OFDM relaying networks, where an aggregate power constraint is imposed on all relays. We first formulate the model into a single-parameter optimization problem, in which we found the related functions are monotonically decreasing. Then based on the monotonicity, we propose a bisection algorithm to solve the problem. We further illustrate that pairing of OFDM subcarriers will not provide performance gain when the aggregate power constraint is very large.