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Wireless systems that carry delay-sensitive information (such as speechand/or video signals) typically transmit with fixed data rates, but mayoccasionally suffer from transmission outages caused by the random nature ofthe fading channels. If the transmitter has instantaneous channel stateinformation (CSI) available, it can compensate for a significant portion ofthese outages by utilizing power allocation. In this paper, we consider optimalpower allocation for a conventional dual-hop bidirectional decode-and-forward(DF) relaying system with a three-phase transmission protocol. The proposedstrategy minimizes the average power consumed by the end nodes and the relay,subject to some maximum allowable system outage probability (OP), orequivalently, minimizes the system OP while meeting average power constraintsat the end nodes and the relay. We show that in the proposed power allocationscheme, the end nodes and the relay adjust their output powers to the minimumlevel required to avoid outages, but will sometimes be silent, in order toconserve power and prolong their lifetimes. For the proposed scheme, the endnodes use the instantaneous CSI of their respective source-relay links and therelay uses the instantaneous CSI of both links.

Optimal Power Allocation for Three-phase Bidirectional DF Relaying with Fixed Rates