16 QAM Communication with 1-Bit Transmitters

TL;DR

This paper introduces a new non-linear precoding method for transmitting 16 QAM symbols in 1-bit massive MISO systems, improving BER performance with low-resolution DACs.

Contribution

It extends the existing MBER precoding technique from QPSK to 16 QAM, enhancing performance in low-resolution, energy-efficient massive MISO systems.

Findings

Significant BER performance improvement for larger MISO gains.

Effective mitigation of multi-user interference with the new precoding.

Enhanced transmission of 16 QAM symbols in low-resolution systems.

Abstract

We present a novel non-linear precoding technique for the transmission of 16 quadrature amplitude modulation (QAM) symbols in a 1-bit massive multi-user (MU) multipleinput- single-output (MISO) downlink system. We deploy low resolution digital-to-analog converters (DACs) at the transmitter for the sake of decreasing the high energy consumption related to the massive MISO system. To mitigate the multi-user interference (MUI) and the distortions due to the low resolution DACs, the minimum bit error ratio (MBER) precoder was introduced in previous work. However, this precoder technique is restricted to quadrature phase shift keying (QPSK) signaling. Our approach consists in upgrading this method to the transmission of 16 QAM symbols. Simulation results show that the performance in terms of uncoded BER is significantly improved for larger massive MISO gain.