Title :
Physical Layer Network Coding for the K-User Multiple Access Relay Channel
Author :
Muralidharan, Vijayvaradharaj T. ; Rajan, B. Sundar
Author_Institution :
Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India
Abstract :
We propose a Physical layer Network Coding (PNC) scheme for the K-user wireless Multiple Access Relay Channel, in which K source nodes want to transmit messages to a destination node D with the help of a relay node R. The proposed scheme involves (i) Phase 1 during which the source nodes alone transmit and (ii) Phase 2 during which the source nodes and the relay node transmit. At the end of Phase 1, the relay node decodes the messages of the source nodes and during Phase 2 transmits a many-to-one function of the decoded messages. To counter the error propagation from the relay node, we propose a novel decoder which takes into account the possibility of error events at R. It is shown that if certain parameters are chosen properly and if the network coding map used at R forms a Latin Hypercube, the proposed decoder offers the maximum diversity order of two. Also, it is shown that for a proper choice of the parameters, the proposed decoder admits fast decoding, with the same decoding complexity order as that of the reference scheme based on Complex Field Network Coding (CFNC). Simulation results indicate that the proposed PNC scheme offers a large gain over the CFNC scheme.
Keywords :
channel coding; decoding; multi-access systems; network coding; relay networks (telecommunication); CFNC scheme; PNC scheme; complex field network coding; decoding complexity order; destination node; error propagation; k-source nodes; k-user wireless multiple access relay channel; latin hypercube; many-to-one function; network coding map; physical layer network coding; reference scheme; relay node transmit; Diversity gain; Latin Hypercubes; multiple access relay channel; physical layer network coding;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2013.042413.121825