Abstract
Non-orthogonal multiple access (NOMA) offers a good balance between throughput and fairness for visible light communication (VLC). This work presents a phase pre-distortion method to improve the symbol error rate performance of NOMA uplink with successive interference cancellation (SIC) decoding in VLC. Both theoretical analysis and experimental evaluation have shown that the proposed phase pre-distortion method improves the bit-error-rate (BER) performance for NOMA under both low and high relative power ratios. Specifically, at low relative power ratios, the proposed method can eliminate the possible BER floors and alleviate the power ratio requirement by 2 dB at the BER of 3.8 × 10-3.
Highlights
Visible light communication (VLC) is an emerging technique of optical wireless communication
Previous works reported that the sum throughput of time division multiple access (TDMA) uplinks and downlinks could be significantly improved by applying Non-orthogonal multiple access (NOMA), and a higher channel gain difference yielded a larger improvement [6]
We extend our work in [10], in which a novel phase pre-distortion scheme was proposed to improve the system performance of NOMA in VLC
Summary
Visible light communication (VLC) is an emerging technique of optical wireless communication. To support optical wireless networks with multiple VLC transmitters and receivers, a designated multiple access method is indispensable. A new multiple access technology, named non-orthogonal multiple access (NOMA), has attracted much research attention, as it offers a better balance between system fairness and throughput [3, 4]. By applying NOMA to orthogonal frequency division multiple access (OFDMA) systems, a better balance between system fairness and throughput [5] is realized. Previous works reported that the sum throughput of time division multiple access (TDMA) uplinks and downlinks could be significantly improved by applying NOMA, and a higher channel gain difference yielded a larger improvement [6]
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