{"title":"Time-Frequency Domain PTRS Aided OTFS Phase Noise Compensation","authors":"Yu Liang;Xiangjun Li;Pingzhi Fan","doi":"10.1109/LCOMM.2025.3529310","DOIUrl":null,"url":null,"abstract":"Orthogonal time frequency Space (OTFS) modulation was developed to mitigate the adverse effects of Doppler shifts. However, accurately estimating phase noise within the delay-Doppler (DD) domain remains a formidable challenge. This letter delves into the compensation of carrier phase error (CPE) and its impact on OTFS modulation performance. To achieve this, a time-frequency (TF) domain-aided phase noise estimation scheme is proposed. First, a superimposed pilot scheme is introduced, in which the superimposed phase-tapped reference symbols (PTRS) are employed in the TF domain for estimating the CPE. Subsequently, a method that utilizes pilots in the DD domain to estimate the DD domain channel, and PTRSs in the TF domain to estimate the CPE is proposed. Through an iterative algorithm bridging these domains, the proposed scheme adeptly compensates for CPE in the DD domain. Simulation results demonstrate superior performance in terms of normalized mean squared error (NMSE) and bit error rate (BER), particularly in scenarios involving oscillator phase noise in both 28 GHz and 70 GHz systems.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"29 3","pages":"527-531"},"PeriodicalIF":3.7000,"publicationDate":"2025-01-13","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/10839375/","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
Orthogonal time frequency Space (OTFS) modulation was developed to mitigate the adverse effects of Doppler shifts. However, accurately estimating phase noise within the delay-Doppler (DD) domain remains a formidable challenge. This letter delves into the compensation of carrier phase error (CPE) and its impact on OTFS modulation performance. To achieve this, a time-frequency (TF) domain-aided phase noise estimation scheme is proposed. First, a superimposed pilot scheme is introduced, in which the superimposed phase-tapped reference symbols (PTRS) are employed in the TF domain for estimating the CPE. Subsequently, a method that utilizes pilots in the DD domain to estimate the DD domain channel, and PTRSs in the TF domain to estimate the CPE is proposed. Through an iterative algorithm bridging these domains, the proposed scheme adeptly compensates for CPE in the DD domain. Simulation results demonstrate superior performance in terms of normalized mean squared error (NMSE) and bit error rate (BER), particularly in scenarios involving oscillator phase noise in both 28 GHz and 70 GHz systems.
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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