Nonlinear Precoding for Phase-Quantized Constant-Envelope Massive MU-MIMO-OFDM
Paper in proceedings, 2018

We propose a nonlinear phase-quantized constant-envelope precoding algorithm for the massive multi-user (MU) multiple-input multiple-output (MIMO) downlink. Specifically, we adapt the 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 the proposed SQUID-OFDM precoder is able to generate transmit signals that are constrained to constant envelope, 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 transmit signal that can be synthesized by low-resolution (e.g., 1-bit) DACs. We use error-rate simulations to demonstrate the superiority of SQUID-OFDM over linear-quantized precoders for massive MU-MIMO-OFDM systems.

MIMO systems

Digital to analog conversion

Mobile telecommunication systems

Gain control

Author

Sven Jacobsson

Ericsson, Göteborg

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Oscar Castaneda

Cornell University

Charles Jeon

Cornell University

Giuseppe Durisi

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Christoph Studer

Cornell University

2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT)

367-372

25th International Conference on Telecommunications (ICT)
Saint Malo, France,

Subject Categories

Telecommunications

Communication Systems

Signal Processing

DOI

10.1109/ICT.2018.8464896

More information

Latest update

1/9/2019 1