Transceiver Design for Massive MIMO Two-Way Half-Duplex AF Hybrid Relay With MIMO Users

• Published in: IEEE transactions on vehicular technology Vol. 68; no. 9; pp. 8759 - 8774
• Main Authors: Sharma, Ekant, Chauhan, Arpita Singh, Budhiraja, Rohit
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Audio frequencies; Baseband; Beamforming; Block diagonalization; Decoders; hybrid relay; Interference; Matrix converters; MIMO communication; Optimization; Quality of service architectures; Radio frequency; Relay; Relays; Signal to noise ratio; Singular value decomposition; Transceivers; two-way
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2019.2928223

We consider a multi-pair two-way amplify-and-forward massive multi-input multi-output (MIMO) hybrid relay with MIMO user-pairs. We employ block-diagonalization-based digital baseband processing at the hybrid relay to cancel the inter user-pair interference, and equal-gain-combining-based radio-frequency (RF) processing to maximize the beamforming gain. We then construct digital relay precoder and the user precoder/decoders using generalized singular value decomposition (GSVD). We also optimize the following for the proposed GSVD transceiver. First, the network transmit power subject to per-stream quality-of-service (QoS) constraints. Second, rate of the transmit stream with the worst signal-to-noise ratio. Finally, sum-rate subject to the per-stream QoS constraints. We numerically show that the proposed hybrid relay has only marginally inferior performance than a full RF chain relay for the three optimization metrics. We also demonstrate the efficacy of the proposed GSVD design over another state-of-the-art transceiver design.