Abstract
The angular diversity aperture (ADA) receiver is a new form of optical wireless receiver which is made up of a number of receiving elements (REs) each consisting of a photodiode (PD) located below an aperture in an opaque screen. Previous work on the use of ADA receivers for visible light communication (VLC) analyzes only REs with round apertures and photodiodes with a limited range of parameters. This paper extends the analysis to calculate the channel gains for REs with for both round and square apertures and PDs and for more parameters. Graphs show how the gain varies as a function of the relative orientation of the transmitter and receiver for ten different designs. It is shown that the directionality of an RE depends on the offset of the PD from the aperture and that the field of view depends on the distance between the aperture and the PD. Detailed theoretical analysis and extensive simulation results demonstrate the bit error rate (BER) performance of receivers based on these ten designs in a multiple-input multiple-output (MIMO) VLC application. The round and square designs are found to have very similar BERs. It is shown that, even with high levels of shot noise, good BER results can be achieved throughout a typical scenario.
Highlights
Visible light communications (VLC) and visible light positioning (VLP) are two important emerging technologies which depend on data transmitted by LED luminaires
bit error rate (BER) RESULTS we compare the performance of different multiple-input multiple-output (MIMO) receiver designs and show how the performance varies with receiver position and orientation
Both the simulated and theoretical BER results are presented as a function of Eb,opt/N0 where Eb,opt is the average transmitted optical energy per bit and can be expressed as Eb,opt = Popt/b, where b denotes the bit rate of the ACO-OFDM signal
Summary
Visible light communications (VLC) and visible light positioning (VLP) are two important emerging technologies which depend on data transmitted by LED luminaires. In both VLC and VLP, angular diversity receivers are likely to play an important role. This paper makes a number of important new contributions which will underpin the analysis and design of these receivers These contributions include: 1) Derivation of the channel gains for REs as a function of the position of the RE relative to the transmitter, the size and shape of the aperture and PD, and the distance and offset of the aperture from the PD. 3) Simulation and theoretical results for a MIMO VLC system showing how the bit error rate (BER) performance varies at three representative points within a typical indoor scenario with four transmitting luminaires and ten different RE designs. The results of extensive BER simulations of MIMO system using ten different receiver designs as a function of position within a typical indoor scenario are presented.
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