Signalling scheme for achieving dynamic degrees of freedom in MIMO Y channel
by Yong Wang; Aixiang Guo; Hong He; Hui Li; Fengrong Li
International Journal of Grid and Utility Computing (IJGUC), Vol. 5, No. 3, 2014

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.

Online publication date: Wed, 29-Oct-2014

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