减小保护间隔正交频分复用：频谱效率的软权衡解决方案

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-10-09 DOI:10.1109/LCOMM.2024.3476486

Zhaoqi Wang;Ran Xu;Shihao Wu;Xiqing Liu;Mugen Peng

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引用次数: 0

摘要

保护间隔称为循环前缀（CP）或零填充（ZP），用于减轻正交频分复用（OFDM）系统中的多径干扰，但以牺牲频谱效率为代价。符号循环移位均衡（SCSE）是我们之前提出的解决无cp OFDM系统中多径传播的方法。然而，当最短可解析路径的功率较低时，SCSE-OFDM表现出较差的误码率性能。鉴于此，我们提出了一种减少保护间隔（RGI）的OFDM方案，该方案实现了SCSE-OFDM和ZP-OFDM之间的软权衡，其中RGI长度可以使用遗传算法进行优化。仿真结果表明，RGI-OFDM的误码率优于SCSE-OFDM，频谱效率优于SCSE-OFDM和ZP-OFDM。RGI-OFDM在大延迟传播的恶劣环境中也表现出明显的优势。

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Reduced Guard Interval Orthogonal Frequency Division Multiplexing: A Soft Trade-Off Solution Toward Spectral Efficiency

The guard interval, termed as cyclic prefix (CP) or zero-padding (ZP), is utilized to mitigate multipath interference in orthogonal frequency division multiplexing (OFDM) systems but at the expense of spectral efficiency. Symbol cyclic shift equalization (SCSE) is our previous proposal to address multipath propagation in CP-free OFDM systems. However, SCSE-OFDM exhibits poor bit error rate (BER) performance when the power of the shortest resolvable path is relatively low. In light of this, we carry out a reduced guard interval (RGI) OFDM scheme that achieves a soft trade-off between SCSE-OFDM and ZP-OFDM, where RGI length can be optimized using genetic algorithm. Simulation results demonstrate superior BER performance of RGI-OFDM over SCSE-OFDM and higher spectral efficiency compared to both SCSE-OFDM and ZP-OFDM. RGI-OFDM also exhibits evident advantages in harsh environments with large delay spread.

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.