Abstract
The spot-diffusing technique provides better performance compared to conventional diffuse system for indoor optical-wireless communication (OWC) system. In this paper, the performance of an OW spot-diffusing communication system using Neuro-Fuzzy (NF) adaptive multi-beam transmitter configuration has been proposed. The multi-beam transmitter generates multiple spots pointed in different directions, hence, forming a matrix of diffusing spots based on position of the receiver and receiver mobility. Regardless of the position of the transmitter and receiver, NF controller target the spots adaptively at the best locations and allocates optimal power to the spots and beam angle are adapted in order to achieve better signal-to-noise plus interference ratio (SNIR). Maximum ratio combining (MRC) is used in the imaging receiver. The proposed OW spot-diffusing communication system is compared with other spot-beam diffusion methods proposed in literature. Performance evaluation revels that the proposed NF based OW spot-diffusing communication system outperforms other spot-beam diffusion methods.
Highlights
With the increasing development of ultra-broadband wireless application the radio frequency (RF) spectrum became congested and scare resources
The spot-diffusing technique provides better performance compared to conventional diffuse system for indoor optical-wireless communication (OWC) system
This paper introduce adaptive neuro-fuzzy interference system (ANFIS) for selecting spot beam matrix for a room and distribute power allocation by calculating delay spread in considering Doppler shift effect of the mobile devices
Summary
With the increasing development of ultra-broadband wireless application the radio frequency (RF) spectrum became congested and scare resources. In [10], to improve the bandwidth, reduce the effect of inter-symbol interference, and increase the signal to noise ratio (SNR) when the transmitter operates at a higher data rate under the impact of multipath dispersion, background noise, and mobility in conjunction with an imaging receiver It proposed different line streaming multi-beam spot diffusion (LSMS) model to gain about 32.3 dB SNR at worst communication path. In this aspect [12] propose a genetic algorithm for multi spot diffuse system in indoor wireless communication.
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