低复杂度noma辅助的5G及以上通信DFrFT-OFDM-IM系统

IF 3 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Aeu-International Journal of Electronics and Communications Pub Date : 2025-04-21 DOI:10.1016/j.aeue.2025.155799

Shubham Anand, Subham Sabud, Preetam Kumar

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引用次数: 0

摘要

5G 及其他通信技术的快速发展推动了对高效、可靠、抗干扰的无线通信系统的需求。传统的正交频分复用（OFDM）系统受到频谱效率（SE）限制和载波间干扰（ICI）的困扰，尤其是在载波频率偏移（CFO）的情况下。为了应对这些挑战，本研究提出了一种非正交多址（NOMA）辅助的基于离散分数傅里叶变换的带索引调制的 OFDM（DFrFT-OFDM-IM）系统。通过将 NOMA 与 OFDM-IM 相结合，所提出的模型增强了 SE，同时利用 DFrFT 减少了 CFO 引起的干扰。为了确保低复杂度的信号检测，采用了改进的对数似然比（LLR）检测器，其性能非常接近最佳最大似然（ML）检测器。在不同的 CFO 条件、子载波激活率和子载波数量下，在瑞利衰减环境中对所提出的系统进行了分析。仿真结果表明，与传统的 NOMA-OFDM 和 NOMA-OFDM-IM 系统相比，该系统的性能有了显著提高，从而验证了它在支持包括物联网、AR/VR 和高速多媒体传输在内的各种用例应用方面的有效性。

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A low complexity NOMA-aided DFrFT-OFDM-IM system for 5G and beyond communication

The rapid advancement of 5G and beyond communication technologies is driving the demand for highly efficient, reliable, and interference-resilient wireless communication systems. Conventional orthogonal frequency division multiplexing (OFDM) systems struggle with spectral efficiency (SE) limitations and intercarrier interference (ICI), especially in the presence of carrier frequency offset (CFO). To address these challenges, this work proposes a non-orthogonal multiple access (NOMA)-aided discrete fractional Fourier transform-based OFDM with index modulation (DFrFT-OFDM-IM) system. By integrating NOMA with OFDM-IM, the proposed model enhances SE while leveraging the DFrFT to mitigate CFO-induced interference. A modified log-likelihood ratio (LLR) detector is employed to ensure low-complexity signal detection, closely approximating the performance of the optimal maximum likelihood (ML) detector. The proposed system is analyzed in a Rayleigh fading environment under various CFO conditions, subcarrier activation ratios, and number of subcarriers. Simulation results demonstrate significant performance gains over conventional NOMA-OFDM and NOMA-OFDM-IM systems, validating its effectiveness in supporting diverse use-case applications, including IoT, AR/VR, and high-speed multimedia transmission.

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来源期刊

Aeu-International Journal of Electronics and Communications 工程技术-电信学

CiteScore

6.90

自引率

18.80%

发文量

292

审稿时长

4.9 months

期刊介绍： AEÜ is an international scientific journal which publishes both original works and invited tutorials. The journal''s scope covers all aspects of theory and design of circuits, systems and devices for electronics, signal processing, and communication, including: signal and system theory, digital signal processing network theory and circuit design information theory, communication theory and techniques, modulation, source and channel coding switching theory and techniques, communication protocols optical communications microwave theory and techniques, radar, sonar antennas, wave propagation AEÜ publishes full papers and letters with very short turn around time but a high standard review process. Review cycles are typically finished within twelve weeks by application of modern electronic communication facilities.