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DOI number:10.1109/TCOMM.2009.10.080223
Journal:IEEE Transactions on Communications
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 per-hop 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.
Indexed by:Journal paper
Discipline:Engineering
First-Level Discipline:Information and Communication Engineering
Volume:57
Issue:10
Page Number:3034-3044
Translation or Not:no
Date of Publication:2009-12-01
Included Journals:SCI