Signalling scheme for achieving dynamic degrees of freedom in MIMO Y channel. (1st January 2014)

• Record Type: Journal Article
• Authors: Wang, Yong; Guo, Aixiang; He, Hong; Li, Hui; Li, Fengrong
• Is Part Of: International journal of grid and utility computing. Volume 5:Number 3(2014)
• Page Start: 149
• Page End: 155
• Publication Date: 2014-01-01
• Subjects: MIMO -- multiple-input multiple-output -- network coding -- utility computing -- degrees of freedom -- signal space alignment; Electronic data processing -- Distributed processing -- Periodicals; Electronic commerce -- Management -- Computer programs -- Periodicals; 004.605
• Languages: English
• ISSNs: 1741-847X

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.