Alternative Awaiting and Broadcast for Two-Way Relay Fading Channels

Details Alternative Awaiting and Broadcast for Two-Way Relay Fading Channels Alternative Awaiting and Broadcast for Two-Way Relay Fading Channels

2011-09-06

arxiv.org/abs/1109.1041v2

Computer Science

Information Theory

27 pages, 10 figures

Scientific paper

We investigate a two-way relay (TWR) fading channel where two source nodes wish to exchange information with the help of a relay node. Given the traditional TWR protocols with immediate forwarding, the transmission rates in both directions are known to be limited by the hop with lower capacity, i.e., the min operations. In this paper, we propose a new transmission protocol, named as alternative awaiting and broadcast (AAB), to cancel the min operations in the TWR fading channels. The process flow, average exchange sum-rate and average delay of the proposed AAB protocol are analyzed. Moreover, we derive an achievable ergodic sum-rate and the corresponding average delay of the AAB protocol base on the well-known lattice codes. Compared with the delay of bit service in the source buffer, the delay in the relay buffer induced by the proposed AAB protocol is very small and negligible. Numerical results show that 1) the average delay of the proposed AAB protocol is bounded and less than about 100 time units, if the difference between two upload transmission rates is less than about 97% of that between two download transmission rates, 2) the proposed AAB protocol with lattice codes significantly improves the achievable ergodic sum-rate with an average delay of only some dozen seconds compared to the traditional non-delay TWR protocols, 3) the proposed AAB protocol with lattice codes approaches the new upper bound of the ergodic sum-capacity at asymptotically large SNRs.

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