Thummaluri, Uday Reddy and Kumar, Abhinav and Natarajan, Lakshmi Prasad
(2019)
MIMO Codes for Uniform Illumination across Space and Time in VLC with Dimming Control.
IEEE Photonics Journal.
ISSN 1943-0647
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Abstract
Indoor visible light communications (VLC) require simultaneous illumination and communication. Hence, uniformity in the illumination is a key consideration for user comfort and data transfer
in the VLC systems. Several run-length limited codes have been proposed in the literature which
mitigate flicker for single input and single output VLC systems. Recently, codes have been proposed for
multiple input multiple output (MIMO) VLC systems. However, uniform illumination along with dimming
control has not been considered for MIMO VLC systems. Hence, in this paper, we propose codes
with generalized algorithms for encoding and decoding that maintain consistency in the illumination
across space and time and achieve the desired dimming level. We present the expressions for code
rate, run-length, and Hamming distance for the proposed codes. Through Monte Carlo simulations,
we compare the codeword error rate (CER) performance of the proposed codes with zero-forcing,
minimum mean square error, and maximum likelihood based detectors for various number of transmit
and receive antennas. We also compare the mutual information of the proposed codes for various
number of transmit and receive antennas. The numerical results show that the proposed codes exhibit
good performance while satisfying the design criteria.
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