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Digital Network Coding Aided Two-Way Relaying: Energy Minimization and Queue Analysis

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3 Author(s)
Zhi Chen ; Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore ; Teng Joon Lim ; Motani, M.

In this paper, we consider a three-node, two-way relay system with digital network coding. The aim is to minimize total energy consumption while ensuring queue stability at all nodes, for a given pair of random packet arrival rates. Specifically, we allow for a set of transmission modes and solve for the optimal fraction of resources allocated to each mode. First, we formulate and solve the static-channel problem, where all link gains are constant over the duration of transmission. Then, we solve the fading-channel problem, where link gains are random. We call the latter the ergodic energy efficiency problem and show that its solution has a water-filling structure. Finally, we provide a detailed analysis of the queues at each node when a random scheduling method that closely approximates the theoretical design is used.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:12 ,  Issue: 4 )

Date of Publication:

April 2013

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