Mutual Information Based Analysis for Physical-Layer Network Coding with Optimal Phase Control

Authors: M. Wu, D. W├╝bben, A. Dekorsy
Abstract: In this paper two-way relaying networks are considered using physical-layer network coding (PLNC) in a two-phase protocol. In the multiple access (MA) phase, both sources transmit their messages to the relay simultaneously. Subsequently, the relay estimates and broadcasts the XOR-based network coded message back to the sources in the broadcast (BC) phase. We concentrate on the critical MA phase where several detection and decoding schemes at the relay are investigated and compared with respect to mutual information (MI) and system throughput. It is shown, that for some detection and decoding schemes, the system performance is highly dependent on the phase difference of the two incoming messages at the relay, motivating a phase control strategy at the sources before transmission. Simulation results confirm our analysis and the superior performance achieved by phase control in practical systems.
Document type: Conference Paper
Publication: Munich, Germany, 21. - 24. January 2013
Conference: 9th International ITG Conference on Systems, Communications and Coding (SCC 2013)
Files:
PLNC_MI.pdf172 KB
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Last change on 25.01.2013 by M. Wu
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