Performance evaluation of carrier-less amplitude phase modulation scheme for indoor visible light communication (VLC) system

Yew, Joyce Pei Ling (2022) Performance evaluation of carrier-less amplitude phase modulation scheme for indoor visible light communication (VLC) system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (Full Text) Performance evaluation of carrier-less amplitude phase modulation scheme for indoor visible light communication (VLC) system.pdf - Submitted Version Download (5MB)

Abstract

According to recent trends, the existing radio frequency (RF) spectrum may be insufficient to fulfill future data demands. The use of visible spectrum for wireless transmission in visible light communication may be a possible alternative to the RF 'Spectrum Crunch.' Investigating the performance of various modulation techniques in VLC is a new field of research. In the VLC system, data is transmitted digitally and represented by turning ON/OFF the LED. Basically, this is done by a modulator. However, based on the evolution of new generation high brightness LED's, the LEDs intensity and flickering become the major problem in VLC, which limits the transmission bandwidth and the performance of the system. This project examines carrier-less amplitude phase (CAP) modulation techniques to overcome this problem and proposes a suitable improvement to the system to be used. Within a simulated VLC system, the performance of CAP in terms of eye diagram, BER and scatter plot is examined. The BER for CAP is zero as no distance is set in simulation which allows perfect transmission to be simulated. For scatter plots, it can be observed that as the CAP modulation number increases, the scatter plot also increases. For eye diagram, it was noted that CAP modulation offers a better visual representation of how noise could affect system performance than OOK modulation.

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