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In this paper, based on BPSK chirp spread spectrum modulation system, we first describe the channel estimation of matched filtering and FFT, and derive the influence of ISI on the channel estimation of the current pilot symbol. Then we proposed the improved channel estimation based on the estimated time delay spread and transmitted signals. Finally, we simulate the MSE performance of channel estimation under different channels and different transmitted signals. The simulation results show that the MSE performance of the improved channel estimation can be improved under different channel when the SF is low, and higher throughput can be obtained.<\/jats:p>","DOI":"10.3233\/jifs-189697","type":"journal-article","created":{"date-parts":[[2021,2,2]],"date-time":"2021-02-02T18:15:51Z","timestamp":1612289751000},"page":"4377-4386","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["The influence of ISI on channel estimation and optimized channel estimation in PSK-chirp system"],"prefix":"10.1177","volume":"41","author":[{"given":"Nan","family":"Zhao","sequence":"first","affiliation":[{"name":"Beijing Smart-Chip Microelectronics Technology Co. Ltd., Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yubo","family":"Wang","sequence":"additional","affiliation":[{"name":"Beijing Smart-Chip Microelectronics Technology Co. Ltd., Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoke","family":"Tang","sequence":"additional","affiliation":[{"name":"Beijing Smart-Chip Microelectronics Technology Co. Ltd., Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Gan","sequence":"additional","affiliation":[{"name":"Beijing Smart-Chip Microelectronics Technology Co. Ltd., Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xu","family":"Zhao","sequence":"additional","affiliation":[{"name":"Beijing Smart-Chip Microelectronics Technology Co. Ltd., Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yubing","family":"Zhang","sequence":"additional","affiliation":[{"name":"Beijing Smart-Chip Microelectronics Technology Co. 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