Enhanced Power Allocation for Sum Rate Maximization in OFDM-NOMA VLC Systems
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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其它資訊
摘要This letter investigates the power allocation problem for the downlink of an orthogonal frequency division multiple (OFDM)-based non-orthogonal multiple access visible light communication (NOMA-VLC) system. Unlike the commonly used two-user OFDM-NOMA VLC model, in this letter, an arbitrary number of multiplexed users is considered when formulating the sum rate maximization problem. Moreover, both user-level and subcarrier-level power optimization are taken into account to improve the system performance. The corresponding theoretical analysis is presented, with the consideration of optimal decoding order and each user's required signal-to-interference-plus-noise ratio (SINR). Given a fixed power constraint on each OFDM subcarrier, we derive the optimal power ratio for an arbitrary number of multiplexed users in OFDM-NOMA VLC. Numerical results show that with a required SINR of 3 dB, the proposed enhanced power allocation algorithm has 39.59% and 40.11% sum-rate enhancement when compared to optimized fixed power allocation algorithm and gain ratio power allocation algorithm, respectively.
著者Yaru Fu, Yang Hong, Lian-Kuan Chen, Chi Wan Sung
期刊名稱IEEE Photonics Technology Letters
出版年份2018
月份7
日期1
卷號30
期次13
出版社IEEE
頁次1218 - 1221
國際標準期刊號1041-1135
電子國際標準期刊號1941-0174
語言美式英語

上次更新時間 2020-21-11 於 02:49