Differential space–time network coding in MIMO two‐way relay channel network

Abstract

Summary This paper focuses on noncoherent detection scheme for multiple‐input multiple‐output two‐way relay channel network with two two‐antennas source nodes and one single‐antenna relay node. An orthogonal differential space–time network coding (ODSTNC) scheme based on relay detection and forward protocol is proposed. The proposed scheme combines space–time coding with network coding, and the differential modulation and detection are used in both multiple access stage and broadcast stage. The multiple‐symbol differential detection is employed at the relay. The maximum likelihood decision and its low‐complexity sphere decoding decision are given. The upper and lower bounds on the average symbol error probability for this system under differential binary phase shift keying (DBPSK) are derived, and a diversity order of 2 is confirmed to be achieved. The simulation results show that the ODSTNC scheme has good performance, and it is available for the applications of far distance signal transmission between two terminals where channel state information is unknown. Copyright © 2014 John Wiley & Sons, Ltd.

Joint relay antenna and precoding selection for K‐user MIMO Y channels with physical‐layer network coding

“…MIMO can achieve high spectrum efficiency by configuring multiple antennas at both transmitter and receiver, that is, spatial multiplexing [1,2]. Recently, physical-layer network coding (PNC) is advocated and regarded as a promising technology to increase the spectrum efficiency by employing the superposition of electromagnetic waves [3,4]. Therefore, it would be better if MIMO and PNC technologies are combined together to optimize the spectrum efficiency of wireless communications [5][6][7].…”