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arXiv · 2108.06229

Hardware-Aware Beamspace Precoding for All-Digital mmWave Massive MU-MIMO

Emre Gönültaş·Sueda Taner·Alexandra Gallyas-Sanhueza·Seyed Hadi Mirfarshbafan·Christoph Studer
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Abstract

Massive multi-user multiple-input multiple-output (MU-MIMO) wireless systems operating at millimeter-wave (mmWave) frequencies enable simultaneous wideband data transmission to a large number of users. In order to reduce the complexity of MU precoding in all-digital basestation architectures, we propose a two-stage precoding architecture that first performs precoding using a sparse matrix in the beamspace domain, followed by an inverse fast Fourier transform that converts the result to the antenna domain. The sparse precoding matrix requires a small number of multipliers and enables regular hardware architectures, which allows the design of hardware-efficient all-digital precoders. Simulation results demonstrate that our methods approach the error-rate of conventional Wiener filter precoding with more than 2x reduced complexity.

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Emre Gönültaş, Sueda Taner, Alexandra Gallyas-Sanhueza, Seyed Hadi Mirfarshbafan, Christoph Studer. 2021-08-13. Hardware-Aware Beamspace Precoding for All-Digital mmWave Massive MU-MIMO. https://arxiv.org/abs/2108.06229

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