Space-Time Block Coded Spatial Modulation Aided mmWave MIMO with Hybrid Precoding

TL;DR

This paper proposes a hybrid beamforming scheme combining space-time block coded spatial modulation for mmWave MIMO, demonstrating improved error performance and multiplexing gains through simulation results.

Contribution

It introduces a novel combination of STBC, SM, and hybrid beamforming for mmWave MIMO, enhancing performance and spectral efficiency.

Findings

ZF and MMSE precoding improve BER performance.

Array of ABF significantly enhances BER.

Minimum 2 antennas needed for better BER than conventional systems.

Abstract

In this paper, a combination of Space Time Block Coded Spatial Modulation with Hybrid Analog-Digital Beamforming (STBC-SM-HBF) for Millimeter-wave (mmWave) communications is proposed in order to take advantage of the merits of Spatial Modulation (SM), Space-Time Block Codes (STBC), Analog Beamforming (ABF), and digital precoding techniques while avoiding their drawbacks. This proposed system benefits from the multiplexing gain of SM, from the transmit diversity gain of STBC, and from the Signal-to-Noise Ratio (SNR) gain of the beamformer. The simulation results demonstrate that the Zero Forcing (ZF) and the Minimum Mean Square Error (MMSE) precoded STBC-SM systems have better Bit Error Rate (BER) performance than the precoded SM systems. Moreover, the precoded SM shows a performance degradation compared to STBC-SM system. Furthermore, the BER is significantly improved by employing an array of ABF. In addition, it is demonstrated that a minimum of 2 antenna elements in the proposed scheme of STBC-SM-HBF are required to obtain better BER than that of the conventional SM and STBC-SM systems under the same spectral efficiency of 2 bits per sec per Hz.