Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 8, Issue 3, Pages 885-888Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2019.2898572
Keywords
Non-stationary channel analysis; linear precoders; massive MIMO
Categories
Funding
- Towards Agile, Efficient, Autonomous and Massively Large Network of Things, within the Horizon 2020 Program [690893]
- Danish Council for Independent Research (Det Frie Forskningsrad) [DFF-133500273, DFF-701700271]
- U.S. Department of Transportation through the Data-Supported Transportation Operations and Planning Tier 1 University Transportation Center
- National Science Foundation [ECCS-1711702]
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In a massive MIMO system with large arrays, the channel becomes spatially non-stationary. We study the impact of spatial non-stationarity characterized by visibility regions (VRs) where the channel energy is significant on a portion of the array. Relying on a channel model based on VRs, we provide expressions of the signal-to-interference-plus-noise ratio (SINR) of conjugate beamforming (CB) and zero-forcing (ZF) precoders. We also provide an approximate deterministic equivalent of the SINR of ZF precoders. We identify favorable and unfavorable multiuser configurations of the VRs and compare the performance of both stationary and non-stationary channels through analysis and numerical simulations.
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