Title: Signalling scheme for achieving dynamic degrees of freedom in MIMO Y channel

Authors: Yong Wang; Aixiang Guo; Hong He; Hui Li; Fengrong Li

Addresses: State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, Shaanxi, China ' State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, Shaanxi, China ' State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, Shaanxi, China ' State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an, Shaanxi, China ' Key Laboratory of Wireless Sensor Network & Communication, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China

Abstract: The Multiple Input and Multiple Output (MIMO) Y channel is a generalised channel model of the two-way relay channel, which supports point-to-multipoint traffic pattern for unicast. In this paper, a signalling scheme for achieving dynamic Degrees of Freedom (DOF) in the MIMO Y channel is proposed where each user exchanges d pairs of messages with each of the other users simultaneously via an intermediate relay and d is a variable integer. To complete this scheme, two novel signalling techniques are utilised, which are Signal Space Alignment for Network Coding (SSA-NC) and interference nulling beamforming combined with Receiving Antenna Selection (RAS) technique. Dynamic DOF can be obtained by changing d, e.g., more diversity gain can be obtained if d is small, while more DOF can be achieved if d becomes larger.

Keywords: MIMO Y channel; multiple-input multiple-output; network coding; utility computing; degrees of freedom; signal space alignment; receiving antenna selection; traffic patterns; unicast.

DOI: 10.1504/IJGUC.2014.062904

International Journal of Grid and Utility Computing, 2014 Vol.5 No.3, pp.149 - 155

Received: 10 Dec 2012
Accepted: 20 Apr 2013

Published online: 25 Jun 2014 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article