{"title":"Reduced Guard Interval Orthogonal Frequency Division Multiplexing: A Soft Trade-Off Solution Toward Spectral Efficiency","authors":"Zhaoqi Wang;Ran Xu;Shihao Wu;Xiqing Liu;Mugen Peng","doi":"10.1109/LCOMM.2024.3476486","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 12","pages":"2920-2924"},"PeriodicalIF":3.7000,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Communications Letters","FirstCategoryId":"94","ListUrlMain":"https://ieeexplore.ieee.org/document/10711309/","RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"TELECOMMUNICATIONS","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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.
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