Towards the Asymptotic Sum Capacity of the MIMO Cellular Two-Way Relay   Channel
  In this paper, we consider the transceiver and relay design for multiple-input multiple-output (MIMO) cellular two-way relay channel (cTWRC), where a multi-antenna base station (BS) exchanges information with multiple multi-antenna mobile stations via a multi-antenna relay station (RS). We propose a novel two-way relaying scheme to approach the sum capacity of the MIMO cTWRC. 
Zhaoxi Fang, Xiaojun Yuan, and Xin Wang
cs.IT math.IT