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SAIEE Africa Research Journal

On-line version ISSN 1991-1696
Print version ISSN 0038-2221


SHIMAPONDA-NAWA, Mulundumina; ACHARI, Shamin; JAYAKODY, Dushantha Nalin K.  and  CHENG, Ling. Visible Light Communication System Employing Space Time Coded Relay Nodes and Imaging Receivers. SAIEE ARJ [online]. 2020, vol.111, n.2, pp.56-64. ISSN 1991-1696.

In this paper, authors propose a VLC system, whose source of information is assumed to be a power line, and employs a combination of relaying and multiple-input multiple-output (MIMO) techniques. Precisely, the performance of a VLC system, with relay nodes equipped with a MIMO technique called space time block coding (STBC), is investigated. The bit error rate (BER) performance of the Alamouti coding (AC) scheme, which is a type of STBC, is specifically considered. In order to enhance the overall system reliability, we propose to use an imaging receiver (ImR), in conjunction with the relay-MIMO setup. In comparison to when a nonimaging receiver (NImR) is employed, an improved signal-to-noise ratio (SNR) of 7 dB is observed when an ImR with a specific number of pixels, is used, hence, improving the BER. We also investigate and show that the selected number of pixels and receiver location have an effect on the system BER. SNR values of 9 dB, 11 dB and 15 dB were required to maintain a BER of 10~4for imaging receivers with 70, 50 and 20 pixels, respectively.

Keywords : Alamouti Coding; Imaging receivers; MIMO; Power line communication; Relays; Space time block coding; Visible light communication.

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