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An optimal transmission scheme for two-way relaying networks with power constraint

Cooperative communication is an efficient method to combat wireless channel fading and to increase system throughput in future board communication. Through physical layer networking coding(PNC)modulation, two-way relaying has been shown to improve the network capacity significantly. However for power-constraints application, the performance of two-way relaying is actually inferior to one-way relaying at low SNR environment. To solve the issue, the scenario of three nodes cooperative communication is considered in this paper.Assuming that perfect channel knowledge is available at the relay node, an optimal transmission scheme for two-way relaying communication is proposed. The transmission scheme, which is based on instantaneous channel link quality, is selected to offer maximum system capacity. The efficiency of the proposed solution is demonstrated by both analytical performance and simulations.