16 QAM Communication with 1-Bit Transmitters
Conference: WSA 2017 - 21th International ITG Workshop on Smart Antennas
03/15/2017 - 03/17/2017 at Berlin, Deutschland
Proceedings: WSA 2017
Pages: 5Language: englishTyp: PDF
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Authors:
Ben Amor, Donia; Jedda, Hela (Technical University of Munich, 80290 Munich, Germany)
Nossek, Josef (Technical University of Munich, 80290 Munich, Germany & Federal University of Cear�a, Fortaleza, Brazil)
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) multiple-input-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 based on the superposition coding idea. Simulation results show that the performance in terms of uncoded BER is significantly improved for larger massive MISO gain.