1-bit digital-to-analog (DACs) and analog-to-digital converters (ADCs) are gaining more interest in massive MIMO systems for economical and computational efficiency. We present a new precoding technique to mitigate the inter-user-interference (IUI) and the channel distortions in a 1-bit downlink MUMISO system with QPSK symbols. The transmit signal vector is optimized taking into account the 1-bit quantization. We develop a sort of mapping based on a look-up table (LUT) between the input signal and the transmit signal. The LUT is updated for each channel realization. Simulation results show a significant gain in terms of the uncoded bit-error-ratio (BER) compared to the existing linear precoding techniques.
@article{arxiv.1706.08708,
title = {Minimum BER Precoding in 1-Bit Massive MIMO Systems},
author = {Hela Jedda and Josef A. Nossek and Amine Mezghani},
journal= {arXiv preprint arXiv:1706.08708},
year = {2017}
}
Comments
Presented in IEEE SAM 2016, 10th-13th July 2016, Rio De Janeiro, Brazil