Reduced-Complexity Iterative Receiver for Improving the IEEE 802.15.7 Convolutional-Coded Color Shift Keying Mode

Abstract

Abstract-In this paper, we conceive novel symbol-based ColorShift Keying (CSK)-aided concatenated coding schemes, which provide attractive performance gains over the comparable bitbased systems. Quantitatively, our 4CSK-aided and 16CSK-aided symbol-based concatenated systems require 0.8 dB and 0.45 dB lower SNR than the equivalent bit-based schemes. In terms of decoding complexity, the 4CSK-aided and 16CSK-aided systems reduce the decoding complexity by 67% and 33%, respectively. We have also analyzed the convergence behavior of our system with the aid of non-binary EXtrinsic Information Transfer (EXIT) charts adapted for symbol-based iterative CSK-assisted systems.

Evaluation of Solar Panel Bandwidth for RGB Channels in Visible Light Communication

“…Therefore, in equal conditions, the responsivity between the RGB LED and the solar panel should be similar. Hence, we remark that the different responsivity values of each RGB channel show the viability of implementing multi-color modulation schemes, such as CSK [18,19], in a VLC system with a solar-panel receiver.…”

“…On the receiver side, positive-intrinsic negative (PIN) PD is the most common photodetector used in VLC systems. Additionally, the use of PDs with RGB optical filters [16,17], employing color-shift keying (CSK) modulation can improve further the transmission rate of VLC systems [18,19]. Since a solar panel can directly convert photon power into electrical current without requiring an external power source, there is a potential opportunity for this type of passive device to be also used as a VLC receiver.…”

“…Since a solar panel can directly convert photon power into electrical current without requiring an external power source, there is a potential opportunity for this type of passive device to be also used as a VLC receiver. The main advantage of using a solar panel as a VLC receiver (Rx) is the simplicity of the receptor design, which removes the need for a transimpedance amplifier [18][19][20]. Several studies have examined the design of solar panel-based receivers for simultaneous optical wireless communication (OWC) and energy harvesting [14].…”

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

“…Apart from the widely known modulation schemes, some unique modulation techniques have also been developed for VLC systems, including colour shift keying (CSK) [55]- [58], generalized colour modulation (GCM) [59], [60], optical orthogonal frequency division multiplexing (OOFDM) [61]- [65], etc. Explicitly, the CSK scheme using multi-chip LEDs was standardized in the IEEE 802.15.7 recommendation [66], which may be a potential modulation scheme for future VLC systems, although it relies on sophisticated implementation.…”