Abstract
Light emitting diode (LED) based indoor multiple input multiple output visible light communication system has LEDs placed at various positions in the room which are simultaneously used for illumination and communications. In such a system, there should be no human perceivable fluctuations in the intensity of the individual LEDs to avoid user discomfort. In order to achieve the uniformity in illumination, we propose codes under the constraints of constant total transmit power per symbol and constant average transmit power for each individual LED. We show the performance of the proposed codes in terms of various metrics like bit error rate (BER), consistency in illumination, and spectral efficiency with suitable expressions. We also numerically analyze the impact of channel state information (CSI) on BER performance by assuming perfect CSI is not always available but periodically updated at the receiver.
Highlights
Multiple input multiple output (MIMO) visible light communication (VLC) systems typically use light emitting diodes (LEDs) as the transmit antennas because of the numerous advantages that Light emitting diode (LED) have over the traditional lighting sources [1]
Several coding schemes have been proposed for MIMO VLC systems such as space shift keying (SSK) [2], generalized space shift keying (GSSK) [3], spatial multiplexing (SMP) [4], spatial modulation (SM) [5], generalized spatial modulation (GSM) [6], dual-LED complex modulation (DCM) [7], and quad-LED complex modulation (QCM) [8]
We have proposed memory-based codes under the constraints of constant total transmit power per symbol and same average transmit power per LED, where, these constraints helps to achieve uniformity in the illumination per LED and overall system across different time slots
Summary
Multiple input multiple output (MIMO) visible light communication (VLC) systems typically use light emitting diodes (LEDs) as the transmit antennas because of the numerous advantages that LEDs have over the traditional lighting sources [1]. In indoor environment, such LED-based MIMO VLC systems can be used for simultaneous illumination and communications. We need to maintain uniformity in illumination over time at system level, i.e., considering all the LEDs and at individual LED level Maintaining this uniform illumination at individual LED level is important as a stationary or moving user should not perceive different illumination from each LED. Several coding schemes have been proposed for MIMO VLC systems such as space shift keying (SSK) [2], generalized space shift keying (GSSK) [3], spatial multiplexing (SMP) [4], spatial modulation (SM) [5], generalized spatial modulation (GSM) [6], dual-LED complex modulation (DCM) [7], and quad-LED complex modulation (QCM) [8]
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