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In the high\u2010mobility scenario, OTFS is becoming a potential scheme for the sixth\u2010generation (6G) wireless communication system. However, the large size of the effective delay\u2010Doppler (DD) domain channel matrix brings unbearable computational complexity to the signal detection algorithm based on the matrix inversion. We propose a low\u2010complexity EP detector based on the sparsity and the block circulant structure of the effective channel covariance matrix in the DD domain. The proposed algorithm only requires log\u2010linear complexity. In addition, simulation results show that the proposed algorithm not only has the advantage of low complexity but also has good performance, which achieves a tradeoff between performance and complexity.<\/jats:p>","DOI":"10.1049\/2024\/3256977","type":"journal-article","created":{"date-parts":[[2024,10,25]],"date-time":"2024-10-25T12:20:34Z","timestamp":1729858834000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Low\u2010Complexity Expectation Propagation Detector for OTFS"],"prefix":"10.1049","volume":"2024","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-0669-5271","authenticated-orcid":false,"given":"Xumin","family":"Pu","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5933-6743","authenticated-orcid":false,"given":"Zhinan","family":"Sun","sequence":"additional","affiliation":[]},{"given":"Wanli","family":"Wen","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6868-6860","authenticated-orcid":false,"given":"Qianbin","family":"Chen","sequence":"additional","affiliation":[]},{"given":"Shi","family":"Jin","sequence":"additional","affiliation":[]}],"member":"265","published-online":{"date-parts":[[2024,10,25]]},"reference":[{"key":"e_1_2_10_1_2","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.001.2000408"},{"key":"e_1_2_10_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.vehcom.2021.100399"},{"key":"e_1_2_10_3_2","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2016.2518085"},{"key":"e_1_2_10_4_2","doi-asserted-by":"publisher","DOI":"10.1109\/TVT.2008.2004555"},{"key":"e_1_2_10_5_2","doi-asserted-by":"crossref","unstructured":"HadaniR. 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