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Multi-hop relaying is an economically efficient architecture for coverageextension and throughput enhancement in future wireless networks. OFDM, on theother hand, is a spectrally efficient physical layer modulation technique forbroadband transmission. As a natural consequence of combining OFDM withmulti-hop relaying, the allocation of per-hop subcarrier power and per-hoptransmission time is crucial in optimizing the network performance. This paperis concerned with the end-to-end information outage in an OFDM based linearrelay network. Our goal is to find an optimal power and time adaptation policyto minimize the outage probability under a long-term total power constraint. Wesolve the problem in two steps. First, for any given channel realization, wederive the minimum short-term power required to meet a target transmissionrate. We show that it can be obtained through two nested bisection loops. Toreduce computational complexity and signalling overhead, we also propose asub-optimal algorithm. In the second step, we determine a power threshold tocontrol the transmission on-off so that the long-term total power constraint issatisfied. Numerical examples are provided to illustrate the performance of theproposed power and time adaptation schemes with respect to other resourceadaptation schemes.

End-to-End Outage Minimization in OFDM Based Linear Relay Networks