Abstract
Channel adaptive signaling, which is based on feedback, can result in almost any performance metric enhancement. Unlike the radio frequency channel, the optical wireless communication (OWC) channel is relatively deterministic. This feature of OWC channels enables a potential improvement of the bidirectional user throughput by reducing the amount of feedback. Light-Fidelity (LiFi) is a subset of OWCs, and it is a bidirectional, high-speed, and fully networked wireless communication technology where visible light and infrared are used in downlink and uplink, respectively. In this paper, two techniques for reducing the amount of feedback in LiFi cellular networks are proposed: 1) limited-content feedback scheme based on reducing the content of feedback information and 2) limited-frequency feedback scheme based on the update interval. Furthermore, based on the random waypoint mobility model, the optimum update interval, which provides maximum bidirectional user equipment throughput, has been derived. Results show that the proposed schemes can achieve better average overall throughput compared with the benchmark one-bit feedback and full-feedback mechanisms.
Highlights
T HE ever increasing number of mobile-connected devices, along with monthly global data traffic which is expected to be 35 exabytes by 2020 [1], motivate both academia and industry to invest in alternative methods
A problem linked to the onebit feedback technique is that there is a low probability that none of the user equipment (UE) will report their signal-to-noise-plus-interference ratio (SINR) to the access point (AP) so that the scheduler is left with no information about the channel condition
limited-frequency feedback (LFF) provides higher uplink throughput thanks to transmission of lower feedback compared to fixed update interval scheme
Summary
T HE ever increasing number of mobile-connected devices, along with monthly global data traffic which is expected to be 35 exabytes by 2020 [1], motivate both academia and industry to invest in alternative methods These include mmWave, massive multiple-input multiple-output (MIMO), free space optical communication and Light-Fidelity (LiFi) for supporting future growing data traffic and next-generation high-speed wireless communication systems. LiFi offers considerable advantages in comparison to radio frequency (RF) systems These include the very large, unregulated bandwidth available in the visible light spectrum, high energy efficiency and the rather straightforward deployment with off-the-shelf light emitting diode (LED) and photodiode (PD) devices at the transmitter and receiver ends respectively, enhanced security as the light does not penetrate through opaque objects [3]. Many works have been carried out to reduce the amount of feedback in RF, very few studies focus on lessening the amount of feedback in optical wireless channels (OWCs)
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