Abstract
Visible Light Communication (VLC) is a promising solution to meet the ever increasing demand for indoor data connectivity with high bit rates. VLC uses the license-free bands and provides high-speed connections unlike RF wireless communication. However; indoor VLC suffers from performance degradation due to either co-channel interference (CCI) or inter-symbol interference (ISI). In this paper, an interference management scheme is proposed for VLC Multi-Input Multi-Output (MIMO) based systems. The scheme reduces the number of interfered signals by using a constrained field-of-view angular diversity receiver CFOV-ADR and then uses least-square (LS) channel estimation with maximum-likelihood (ML) equalizer to resolve the interfered signals. The proposed interference mitigation scheme using constrained-FOV-ADR with channel estimation IM-CFOV-CE enables frequency reuse of one. The bit-error-rate (BER) is calculated at various room positions with different receiver’s heights and rotation angles. The performance evaluation results reveal that the proposed system can achieve a higher number of downlink channels and superior BER performance than that of without CCI management. Also, the proposed scheme has been compared with Time Division Multiple Access (TDMA) technique, and achieves enhanced performance at all positions and orientations of the ADR.
Highlights
Communication revolution era with the explosive growth of broadband applications, Internet services, and the rapid increase of consumer demands for seamless mobile data connectivity, given that the majority of wireless data traffic is generated indoors, service providers are constantly looking for innovative solutions to provide robust indoor wireless coverage [1]
The paper aims to increase number of Visible Light Communication (VLC) downlink channels for each user and to mitigate co-channel interference (CCI) resulting from implementing frequency reuse of one
The goals are achieved by designing an Angular diversity receiver (ADR) with a limited field-of-view angle to reduce number of interfered LOS signals
Summary
Communication revolution era with the explosive growth of broadband applications, Internet services, and the rapid increase of consumer demands for seamless mobile data connectivity, given that the majority of wireless data traffic is generated indoors, service providers are constantly looking for innovative solutions to provide robust indoor wireless coverage [1]. A precoded MIMO is designed to decode independent streams that are transmitted simultaneously from different transmitters [16] This technique achieves high spectral efficiency, it has high implementation complexity especially when a large number of LEDs are installed. CCI is mitigated in SMP based MIMO-VLC downlink channels by proposing efficient channel estimation scheme. Increasing the overall capacity of the downlink VLC network by reallocating the same optical spectrum among neighboring transmitters (SMP MIMO with a frequency reuse factor of one) in contrast to the existing MIMO and multiplexing techniques. Guaranteeing user connectivity, and maximizing the number of downlink channels received by each user at all positions and orientations This enables full user mobility and facilities handover between different LEDs. This paper is organized as follows, Section II describes the ADR channel in the VLC model. The notation (.)T , , and . denote transpose, convolution, and the norm, respectively
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