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针对现有速率分裂多址接入(Rate Splitting Multiple Access, RSMA)在可见光通信(Visible Light Communication, VLC)系统中与光正交频分复用(Optical-Orthogonal Frequency Division Multiplexing, O-OFDM)结合不足，以及多用户场景下私有流共用子载波引发的干扰问题，提出一种基于RSMA-OFDM可见光通信系统的资源分配方案。该方案将不同用户的私有流分配至正交的OFDM子载波上，而公共流则通过功率域叠加进行传输，以减少用户间干扰并降低串行干扰消除(Successive Interference Cancellation, SIC)的复杂度。仿真结果表明，与未采用所提方案的RSMA-OFDM VLC系统相比，采用该方案的系统，在不同功率分配方案下，达到误码率(Bit Error Rate, BER)阈值所需的信噪比(Signal-to-Noise Ratio, SNR)最少降低了约6 dB,有效地降低了系统所需发射功率，并提高系统的能效。
Abstract：To address the insufficient integration of rate-splitting multiple access(RSMA) with optical-orthogonal frequency division multiplexing(O-OFDM) in visible light communication(VLC) systems, as well as the interference caused by private streams sharing the same subcarriers in multi-user scenarios, a resource allocation scheme for RSMA-OFDM VLC systems is proposed. In this scheme, private streams of different users are allocated to orthogonal OFDM subcarriers, while the common stream is transmitted via power-domain superposition, so as to mitigates inter-user interference and reduces the complexity of successive interference cancellation(SIC). Simulation results demonstrate that, compared to the RSMA-OFDM VLC system without the proposed scheme, the system employing the proposed subcarrier resource allocation scheme can decrease the signal-to-noise ratio(SNR) required to achieve the bit error rate(BER) threshold by at least approximately 6 dB under various power allocation strategies, which significantly reduces the transmit power requirements and consequently enhances the energy efficiency of the system.
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基本信息:
DOI：10.13682/j.issn.2095-6533.2025.05.001
中图分类号:TN929.1
引用信息:
[1]孙衍哲,杨婷,曹天等.一种基于RSMA-OFDM可见光通信系统的资源分配方案[J].西安邮电大学学报,2025,30(05):1-11.DOI:10.13682/j.issn.2095-6533.2025.05.001.
基金信息:
国家自然科学基金项目(62071365); 陕西省重点研发计划项目(2017ZDCXLGY-06-02); 陕西省“校招共用”高层次创新创业人才计划项目(H024010008); 中国煤炭科工集团煤炭科学技术研究院有限公司与西安电子科技大学合作研究项目(N-KY-HX-1101-202302-00725)