3 years ago

Nonlinear Phase-Quantized Constant-Envelope Precoding for Massive MU-MIMO-OFDM.

Sven Jacobsson, Charles Jeon, Giuseppe Durisi, Oscar Castañeda, Christoph Studer

We propose a novel algorithm for phase-quantized constant-envelope precoding in the massive multi-user (MU) multiple-input multiple-output (MIMO) downlink. Specifically, we extend the nonlinear squared-infinity norm Douglas-Rachford splitting (SQUID) precoder to systems that use oversampling digital-to-analog converters (DACs) at the base station (BS) and orthogonal frequency-division multiplexing (OFDM) to communicate over frequency-selective channels. We demonstrate that SQUID is able to generate constant-envelope signals, which enables the use of power-efficient analog radio-frequency circuitry at the BS. By quantizing the phase of the resulting constant-envelope signal, we obtain a finite-cardinality signal that can be synthesized by low-resolution (e.g., 1-bit) DACs. We use error-rate simulations to demonstrate the superiority of SQUID over linear precoders for massive MU-MIMO-OFDM.

Publisher URL: http://arxiv.org/abs/1710.06825

DOI: arXiv:1710.06825v1

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