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We propose a nonlinear phase-quantized constant-envelope precoding algorithmfor 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 thatthe proposed SQUID-OFDM precoder is able to generate transmit signals that areconstrained to constant envelope, which enables the use of power-efficientanalog radio-frequency circuitry at the BS. By quantizing the phase of theresulting constant-envelope signal, we obtain a finite-cardinality transmitsignal that can be synthesized by low-resolution (e.g., 1-bit) DACs. We useerror-rate simulations to demonstrate the superiority of SQUID-OFDM overlinear-quantized precoders for massive MU-MIMO-OFDM systems.

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