Low-Complexity Oversampled OTFS Receivers With Reduced Overhead
Orthogonal Time Frequency Space (OTFS) modulation enables reliable communication in fast time-varying, frequency-selective channels. It is a delay-Doppler (DD) domain modulation that models the information symbols and the channel in the DD domain. This paper considers a pulse-shaped OTFS system with...
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| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of the Communications Society |
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| Online Access: | https://ieeexplore.ieee.org/document/10879026/ |
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| author | Narendra Deconda Srikrishna Bhashyam Nambi Seshadri R. David Koilpillai |
| author_facet | Narendra Deconda Srikrishna Bhashyam Nambi Seshadri R. David Koilpillai |
| author_sort | Narendra Deconda |
| collection | DOAJ |
| description | Orthogonal Time Frequency Space (OTFS) modulation enables reliable communication in fast time-varying, frequency-selective channels. It is a delay-Doppler (DD) domain modulation that models the information symbols and the channel in the DD domain. This paper considers a pulse-shaped OTFS system with oversampling at the receiver. To mitigate Inter-Frame and Inter-Block Interference, we propose a Reduced Cyclic Prefix (RCP) and Reduced Cyclic Suffix (RCS) frame structure for the OTFS systems that need significantly less overhead than the existing Zero-padded OTFS frame structure. At the receiver, we propose a Finite Impulse Response filter-based Noise Whitening and an iterative delay-time domain Maximal Ratio Combining equalizer that has low complexity and employs oversampling. Through Monte Carlo simulations, we show improved system error performance with oversampling and excess bandwidth. The proposed equalizer provides a significant complexity reduction compared to the existing Message-passing equalizer for a minimal degradation in error performance. We then simulate a Matched Filter Bound (MFB) for OTFS systems. The proposed equalizer is within 3 dB of the MFB performance at an error rate of 10-4. |
| format | Article |
| id | doaj-art-a0fbd517712748bcb1fcc61d2bc132b8 |
| institution | OA Journals |
| issn | 2644-125X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Communications Society |
| spelling | doaj-art-a0fbd517712748bcb1fcc61d2bc132b82025-08-20T02:29:27ZengIEEEIEEE Open Journal of the Communications Society2644-125X2025-01-0163357337210.1109/OJCOMS.2025.354035610879026Low-Complexity Oversampled OTFS Receivers With Reduced OverheadNarendra Deconda0https://orcid.org/0009-0000-0635-1993Srikrishna Bhashyam1https://orcid.org/0000-0001-9953-0914Nambi Seshadri2R. David Koilpillai3https://orcid.org/0000-0002-8720-0966Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, IndiaDepartment of Electrical Engineering, Indian Institute of Technology Madras, Chennai, IndiaDepartment of Electrical Engineering, Indian Institute of Technology Madras, Chennai, IndiaDepartment of Electrical Engineering, Indian Institute of Technology Madras, Chennai, IndiaOrthogonal Time Frequency Space (OTFS) modulation enables reliable communication in fast time-varying, frequency-selective channels. It is a delay-Doppler (DD) domain modulation that models the information symbols and the channel in the DD domain. This paper considers a pulse-shaped OTFS system with oversampling at the receiver. To mitigate Inter-Frame and Inter-Block Interference, we propose a Reduced Cyclic Prefix (RCP) and Reduced Cyclic Suffix (RCS) frame structure for the OTFS systems that need significantly less overhead than the existing Zero-padded OTFS frame structure. At the receiver, we propose a Finite Impulse Response filter-based Noise Whitening and an iterative delay-time domain Maximal Ratio Combining equalizer that has low complexity and employs oversampling. Through Monte Carlo simulations, we show improved system error performance with oversampling and excess bandwidth. The proposed equalizer provides a significant complexity reduction compared to the existing Message-passing equalizer for a minimal degradation in error performance. We then simulate a Matched Filter Bound (MFB) for OTFS systems. The proposed equalizer is within 3 dB of the MFB performance at an error rate of 10-4.https://ieeexplore.ieee.org/document/10879026/Delay-doppler channelequalizationlow-complexitymatched filter boundmaximal ratio combiningnoise whitening |
| spellingShingle | Narendra Deconda Srikrishna Bhashyam Nambi Seshadri R. David Koilpillai Low-Complexity Oversampled OTFS Receivers With Reduced Overhead IEEE Open Journal of the Communications Society Delay-doppler channel equalization low-complexity matched filter bound maximal ratio combining noise whitening |
| title | Low-Complexity Oversampled OTFS Receivers With Reduced Overhead |
| title_full | Low-Complexity Oversampled OTFS Receivers With Reduced Overhead |
| title_fullStr | Low-Complexity Oversampled OTFS Receivers With Reduced Overhead |
| title_full_unstemmed | Low-Complexity Oversampled OTFS Receivers With Reduced Overhead |
| title_short | Low-Complexity Oversampled OTFS Receivers With Reduced Overhead |
| title_sort | low complexity oversampled otfs receivers with reduced overhead |
| topic | Delay-doppler channel equalization low-complexity matched filter bound maximal ratio combining noise whitening |
| url | https://ieeexplore.ieee.org/document/10879026/ |
| work_keys_str_mv | AT narendradeconda lowcomplexityoversampledotfsreceiverswithreducedoverhead AT srikrishnabhashyam lowcomplexityoversampledotfsreceiverswithreducedoverhead AT nambiseshadri lowcomplexityoversampledotfsreceiverswithreducedoverhead AT rdavidkoilpillai lowcomplexityoversampledotfsreceiverswithreducedoverhead |