Abstract
This paper is aimed at comparing the performance of multiple-input multiple-output (MIMO) schemes applied to the indoor visible light communication (VLC) system. The MIMO schemes considered for this paper are repetition coding (RC), space-time block codes (STBCs), and spatial multiplexing (SMP). For MIMO design, the current system makes use of unique algebraic codes, i.e., maximum rank distance (MRD) codes in this connection. Two different configurations (2 × 1 and 2 × 2 ) are taken into consideration with distinct transmitters' spacing. Simulation results are presented and a comparative analysis of the current system with an existing system is given mainly in terms of bit error rate (BER), data-rate, and transmission range. The simulation results are validated by the physical implementation of the system using NI cDAQ module programmed in LabVIEW. The simulation and experimentation results indicate that the RC scheme with significant diversity gain provides more robustness as compared to other MIMO schemes; however, the RC exhibits poor multiplexing gain, and hence, it is not spectral efficient. As its counterpart, the STBC and SMP are used that can increase both the capacity and reliability at the cost of slightly reduced transmission range.
Highlights
The ongoing user demands for high-speed wireless broadband home access networks are frequently increasing and it is getting difficult for radio frequency (RF) based wireless system to accommodate all user requirements
It has been shown in both simulations and experimentation that the repetition coding (RC) for 2 × 1 configuration provides a significant amount of diversity gain and outperform all other multiple-input multiple-output (MIMO) schemes
The error-free range provided by the RC is 1.45m which is larger than any another MIMO scheme
Summary
The ongoing user demands for high-speed wireless broadband home access networks are frequently increasing and it is getting difficult for radio frequency (RF) based wireless system to accommodate all user requirements. The RF spectrum has already gridlock and looking for alternative technologies could be the way forward. In this connection, Optical Wireless Communication (OWC) system has become one of the emergent and the cost-effective technologies that employ mono-chromatic light to transmit the digital data via intensity-modulation and direct-detection (IM/DD) optical wireless channel [1]–[5]. In IM/DD, the information bits are transmitted in the form of intensity or power of light. Phase information is not required for communication. While on the receiver side, the intensity or power of an optical signal is directly detected
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