Experimental Demonstration of a Novel Multi-User Bit and Power Loading Algorithm for OFDM-NOMA PON
Experimental Demonstration of a Novel Multi-User Bit and Power Loading Algorithm for OFDM-NOMA PON
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DOI：
10.1109/jlt.2023.3268162
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发表时间：
2023-09
影响因子：
4.7
通讯作者：
Chengju Hu;Geyang Wang;Z. Fan;Jian Zhao
中科院分区：
文献类型：
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作者：
Chengju Hu;Geyang Wang;Z. Fan;Jian Zhao
本文对我们最近提出的贪婪正交频分多址(OFDMMA)比特功率分配(GONBP)算法进行了深入的研究，并在此基础上提出了一种适用于多用户直接检测(DD)的OFDMNOMA无源光网络(PON)的基于裕度的OFDMNOMA比特功率分配(MONBP)算法。这两种算法都是通过考虑所有用户的频率选择性衰落效应、用户之间的相互作用/干扰以及为每个用户分配的总比特的约束，在用户级和子载波级分配比特和功率。43-76Gbit/S PON实验，其中两个光网络单元具有10-20公里的不同传输距离和/或不同的接收光功率。结果表明，GONBP和MONBP算法的性能优于传统的OFDMMA、离散傅里叶变换扩展的OFDMARA、传统的贪婪算法和Chow算法。与GONBP相比，提出的MONBP算法大大降低了复杂度，特别是在ONU信噪比不同的情况下取得了更好的性能，为多用户ONU-NOMA PON提供了一种很有前途的解决方案。
In this article, we conduct an extensive investigation on our recently proposed greedy orthogonal frequency division multiplexing non-orthogonal multiple access (OFDM-NOMA) bit and power allocation (GONBP) algorithm, and further propose a novel margin-based OFDM-NOMA bit and power allocation (MONBP) algorithm for multi-user direct-detection (DD) OFDM-NOMA passive optical network (PON). Both algorithms allocate bits and power at both the user level and the subcarrier level by considering the frequency-selective fading effect of all users, the interaction/interference between users, and the constraint of total allocated bits for each user. 43-76 Gbit/s PON experiments where two optical network units have different transmission distances of 10–20 km and/or different received optical powers are performed. The results show that the proposed GONBP and MONBP outperform conventional OFDM-NOMA, discrete-Fourier-transform spread OFDM-NOMA, conventional greedy algorithm, and Chow's algorithm. Compared to GONBP, the proposed MONBP greatly reduces the complexity and achieves better performance especially when the signal-to-noise ratio profiles of ONUs are different, thus providing a promising solution for multi-user OFDM-NOMA PON.