Dual-mode spatial index modulation for MIMO-OWC

Author:

Zhong Xin,Chen ChenORCID,Zhao Yinan,Liu Min,He Cuiwei1ORCID,Haas Harald2

Affiliation:

1. Japan Advanced Institute of Science and Technology

2. University of Strathclyde

Abstract

In this Letter, we propose and demonstrate a dual-mode spatial index modulation (DM-SIM) scheme for spectral efficiency enhancement of band-limited multiple-input multiple-output optical wireless communication (MIMO-OWC) systems. By performing dual-mode index modulation in the spatial domain, DM-SIM can transmit both spatial and constellation symbols. Since constellation design plays a vital role in the proposed DM-SIM scheme, we further propose three dual-mode constellation design approaches including phase rotation, amplitude scaling and joint phase rotation and amplitude scaling. Moreover, we also designed a differential log-likelihood ratio (LLR) detector for the proposed DM-SIM scheme. Experimental results show that the joint phase rotation and amplitude scaling approach can achieve a remarkable 3.2 dB signal-to-noise ratio (SNR) gain compared with the phase rotation approach in a 2×2 MIMO-OWC system applying DM-SIM.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Chongqing

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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