46 research outputs found
Multiuser beam steering OWC system based on NOMA
In this paper, we propose applying Non-Orthogonal Multiple Access (NOMA)
technology in a multiuser beam steering OWC system. We study the performance of
the NOMA-based multiuser beam steering system in terms of the achievable rate
and Bit Error Rate (BER). We investigate the impact of the power allocation
factor of NOMA and the number of users in the room. The results show that the
power allocation factor is a vital parameter in NOMA-based transmission that
affects the performance of the network in terms of data rate and BER.Comment: ICTON 202
Relay Assisted Multiuser OWC Systems under Human Blockage
This paper proposes using cooperative communication based on optoelectronic
(O-E-O) amplify-and-forward relay terminals to reduce the influence of the
blockage and shadowing resulting from human movement in a beam steering Optical
Wireless Communication (OWC) system. The simulation results indicate that on
average, the outage probability of the cooperative communication mode with
O-E-O relay terminals is two orders of magnitude lower than the outage
probability of the system without relay terminals.Comment: ICTON 202
NOMA Visible Light Communication System with Angle Diversity Receivers
In this paper, a non-orthogonal multiple access (NOMA) visible light communication (VLC) system is investigated. The system uses angle diversity receivers (ADRs) to provide high data rates. The ADR has 4 branches, each directed to a different direction. An 8m x 4m sized room is modelled to study the resource allocation to users according to their channel conditions to maximize the data rate. The results show that using ADRs improves the data rate by an average of 35% compared to a system using wide FOV receivers
Delay Adaptation Method for Relay Assisted Optical Wireless Systems
In this paper, we investigate optical wireless repeaters as relay terminals between a transmitter and a user in an Infrared Optical Wireless Communication (IROWC) system. A delay adaptation method is introduced to solve the problem of irregular signal arrival time from different relay terminals. Three different relay terminal deployment scenarios were investigated in a typical two-phase relay IROWC system with the proposed delay adaptation method. The simulation results indicate that the proposed system has better impulse response compared to the conventional system and that the root-mean-square delay spread of the relay system with the delay adaptation method is on average 30% less than the conventional system