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|Title:||On capacity and optimal scheduling for the half-duplex multiple-relay channel|
multiple-relay channel (MRC)
|Citation:||Ong, L., Motani, M., Johnson, S.J. (2012). On capacity and optimal scheduling for the half-duplex multiple-relay channel. IEEE Transactions on Information Theory 58 (9) : 5770-5784. ScholarBank@NUS Repository. https://doi.org/10.1109/TIT.2012.2204489|
|Abstract:||We study the half-duplex multiple-relay channel (HD-MRC) where every node can either transmit or listen but cannot do both at the same time. We obtain a capacity upper bound based on a max-flow min-cut argument and achievable transmission rates based on the decode-forward (DF) coding strategy, for both the discrete memoryless HD-MRC and the phase-fading HD-MRC. We discover that both the upper bound and the achievable rates are functions of the transmit/listen state (a description of which nodes transmit and which receive). More precisely, they are functions of the time fraction of the different states, which we term a schedule. We formulate the optimal scheduling problem to find an optimal schedule that maximizes the DF rate. The optimal scheduling problem turns out to be a maximin optimization, for which we propose an algorithmic solution. We demonstrate our approach on a four-node multiple-relay channel, obtaining closed-form solutions in certain scenarios. Furthermore, we show that for the received signal-to-noise ratio degraded phase-fading HD-MRC, the optimal scheduling problem can be simplified to a max optimization. © 1963-2012 IEEE.|
|Source Title:||IEEE Transactions on Information Theory|
|Appears in Collections:||Staff Publications|
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