Open AccessExperimental demonstration of bidirectional NOMA-OFDMA visible light communications
Author(s) -
Bangjiang Lin,
Weiping Ye,
Xuan Tang,
Zabih Ghassemlooy
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.004348
Subject(s) - noma , visible light communication , telecommunications link , computer science , orthogonal frequency division multiple access , orthogonal frequency division multiplexing , throughput , interference (communication) , frequency division multiple access , bit error rate , bandwidth (computing) , electronic engineering , channel (broadcasting) , multiplexing , computer network , telecommunications , optics , wireless , engineering , physics , light emitting diode
We propose a non-orthogonal multiple access (NOMA) scheme combined with orthogonal frequency division multiplexing access (OFDMA) for visible light communications (VLC), which offers a high throughput, flexible bandwidth allocation and a higher system capacity for a larger number of users. Bidirectional NOMA-OFDMA VLC is experimentally demonstrated. The effects of power allocation and channel estimation on the bit error rate performance are investigated. The experiment results indicate that accurate channel estimation can eliminate the inter-user interference more effectively. The optimum power allocation ratios for uplink and downlink are both about 0.25 in the case of two users.