Non-orthogonal multiple access with phase pre-distortion in visible light communication

Area of Science:

• Optical Communications
• Signal Processing

Background:

• Visible Light Communication (VLC) systems utilize optical signals for data transmission.
• Non-Orthogonal Multiple Access (NOMA) enhances spectral efficiency and user fairness in communication systems.
• Successive Interference Cancellation (SIC) is a decoding technique used in NOMA to mitigate interference.

Purpose of the Study:

• To propose and evaluate a phase pre-distortion method for improving NOMA uplink performance in VLC.
• To enhance the symbol error rate (SER) and bit-error-rate (BER) of NOMA systems in VLC.

Main Methods:

• Theoretical analysis of the proposed phase pre-distortion technique.
• Experimental validation of the method's effectiveness in a VLC NOMA uplink scenario.
• Performance evaluation based on bit-error-rate (BER) under varying relative power ratios.

Main Results:

• The phase pre-distortion method demonstrably improves BER performance for NOMA in VLC.
• The technique effectively eliminates BER floors at low relative power ratios.
• A 2 dB alleviation in power ratio requirement was achieved at a BER of 3.8 × 10^-3.

Conclusions:

• Phase pre-distortion is a viable technique for enhancing NOMA performance in VLC systems.
• The proposed method offers significant improvements in BER, particularly under challenging low power ratio conditions.
• This technique contributes to more robust and efficient VLC-based NOMA communication.