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arXiv · 1809.06032

Hybrid Block Diagonalization for Massive MIMO Two-Way Half-Duplex AF Hybrid Relay

Arpita Singh Chauhan·Ekant Sharma·Rohit Budhiraja
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Abstract

We consider a multi-pair two-way amplify-and-forward massive multi-input multi-output (MIMO) hybrid relay with MIMO user-pairs. A hybrid relay has lesser number of radio frequency (RF) chains than the antennas, which significantly reduces the implementation cost. We employ block-diagonalization-based baseband processing at the hybrid relay to cancel the inter user-pair interference and equal-gain-combining-based RF processing to maximize the beamforming gain. We also use an algebraic norm maximizing relay transmit strategy to maximize the spectral efficiency (SE) of each user-pair. We numerically show that the proposed hybrid relay has only marginally inferior SE than a full RF-chain relay.

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Arpita Singh Chauhan, Ekant Sharma, Rohit Budhiraja. 2018-09-17. Hybrid Block Diagonalization for Massive MIMO Two-Way Half-Duplex AF Hybrid Relay. https://arxiv.org/abs/1809.06032

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