Nonlinear Precoding for Phase-Quantized Constant-Envelope Massive MU-MIMO-OFDM
Paper i proceeding, 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

Författare

Sven Jacobsson

Ericsson, Göteborg

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Oscar Castaneda

Cornell University

Charles Jeon

Cornell University

Giuseppe Durisi

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Christoph Studer

Cornell University

2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT)

367-372

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

Ämneskategorier

Telekommunikation

Kommunikationssystem

Signalbehandling

DOI

10.1109/ICT.2018.8464896

Mer information

Senast uppdaterat

2019-01-09