Multiuser One-Bit Massive MIMO Precoding Under MPSK Signaling

TL;DR

This paper extends minimum SEP precoding design for one-bit massive MIMO systems to MPSK signaling, demonstrating significant BER improvements for higher-order PSK modulations through simulation results.

Contribution

It applies minimum SEP design to MPSK signaling in one-bit massive MIMO, and provides a new SEP characterization for MPSK.

Findings

Significantly better BER performance for 8-PSK and 16-PSK.

Effective application of minimum SEP design to MPSK.

New SEP characterization for MPSK in one-bit precoding.

Abstract

Most recently, there has been a flurry of research activities on studying how massive MIMO precoding should be designed when the digital-to-analog conversion at the transmitter side is operated by cheap one-bit digital-to-analog converters (DACs). Such research is motivated by the desire to substantially cut down the hardware cost and power consumption of the radio-frequency chain, which is unaffordable in massive MIMO if high-resolution DACs are still used. One-bit MIMO precoding design problems are much harder to solve than their high-resolution DAC counterparts. In our previous work, we developed a minimum symbol-error probability (SEP) design for one-bit precoding under the multiuser MISO downlink scenario and under quadrature amplitude modulation signaling. Leveraging on the previous work, this work shows how the minimum SEP design is applied to M-ary phase shift keying (MPSK) signaling. Simulation results show that our minimum SEP design delivers significantly better bit-error rate (BER) performance than the other designs for higher-order PSK such as 8-PSK and 16-PSK. As a minor, but useful, side contribution, we also tackle an MPSK SEP characterization problem which was only intuitively treated in the prior arts.