Transmit Power Optimization for Two-Way Relay Channels With Physical-Layer Network Coding

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In this letter, we consider a two-way relay channel where two source nodes exchange their packets via a half-duplex relay node, which adopts physical-layer network coding (PNC) for exchanging packets in two time slots. Convolutional codes (CCs) are assumed to be applied as a channel code for each packet. The relay node directly decodes the XORed version of packets of two source nodes in the multiple access (MA) phase. We first mathematically analyze a bit error rate (BER) of the MA phase in the PNC with CCs in Rayleigh fading channels. Then, we propose a power allocation (PA) strategy for minimizing the derived BER expression at the relay node. It is shown that the proposed transmit power solution satisfies the following relationship: P-1*/P-2* = root Omega(2)/Omega(1), where P-i* and Omega(i) denote the optimal power of the ith source node and the variance of the channel gains between the ith source node and the relay node. The proposed PA strategy significantly outperforms conventional PA schemes in terms of the BER.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-02
Language
English
Article Type
Article
Keywords

CONVOLUTIONAL-CODES; PERFORMANCE; CONSTELLATIONS

Citation

IEEE COMMUNICATIONS LETTERS, v.19, no.2, pp.151 - 154

ISSN
1089-7798
DOI
10.1109/LCOMM.2014.2371996
URI
http://hdl.handle.net/10203/195618
Appears in Collection
EE-Journal Papers(저널논문)
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