End-to-end outage minimization in OFDM based linear relay networks

Authors:
Xiaolu Zhang;Meixia Tao;Wenhua Jiao;Chun Sum Ng
Affiliations:
Department of Management Information Systems, China Mobile Communication Corporation, Beijing, P. R. China and Department of Electrical and Computer Engineering, National University of Singapore;Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, P. R. China;Alcatel-ucent, Beijing, P. R. China;Department of Electrical and Computer Engineering, National University of Singapore, Singapore
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

Multi-hop relaying is an economically efficient architecture for coverage extension and throughput enhancement in future wireless networks. OFDM, on the other hand, is a spectrally efficient physical layer modulation technique for broadband transmission. As a natural consequence of combining OFDM with multi-hop relaying, the allocation of perhop subcarrier power and per-hop transmission time is crucial in optimizing the network performance. This paper is concerned with the end-to-end information outage in an OFDM based linear relay network. Our goal is to find an optimal power and time adaptation policy to minimize the outage probability under a long-term total power constraint. We solve the problem in two steps. First, for any given channel realization, we derive the minimum short-term power required to meet a target transmission rate. We show that it can be obtained through two nested bisection loops. To reduce computational complexity and signalling overhead, we also propose a sub-optimal algorithm. In the second step, we determine a power threshold to control the transmission on-off so that the long-term total power constraint is satisfied. Numerical examples are provided to illustrate the performance of the proposed power and time adaptation schemes with respect to other resource adaptation schemes.