Performance Analysis on Two-Way Relay System with Co-Channel Interference

Authors:
Fei Yang;Meiyu Huang;Sihai Zhang;Wuyang Zhou
Affiliations:
Wireless Information Network Laboratory, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China;Wireless Information Network Laboratory, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China;Wireless Information Network Laboratory, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China;Wireless Information Network Laboratory, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China
Venue:
Wireless Personal Communications: An International Journal
Year:
2013

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Abstract

In this paper, we investigate the performance of two-way relay system with co-channel interference in a Rayleigh fading environment. Due to the mathematical intractability of original expression of signal-to-interference and noise ratio (SINR) induced by the bi-directional forwarding, a couple of effective bounds are derived for important performance metrics such as outage probability and average bit error rate of modulation, with application of diverse physical layer network coding (PNC) schemes of two time slot (2TS) and three time slot (3TS). Some asymptotic solutions are also proposed to intuitively exhibit the trends of performance in high SINR regime. We demonstrate that the performance bounds have practical meaning corresponding to different forwarding capability of the relay. Numeric simulations validate our analysis by showing that the theoretic bounds match well with simulation results. Additionally, the effect of distance between relay and sources is discussed in our interference scenario, as well as the impact of relay's power allocation factor in 3TS PNC scheme.