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Linear frequency modulated signal requires a high spreading factor to nearly reach orthogonality between two pairs of signals. On the other hand, nonlinear chirp spread spectrum signals can provide orthogonality at a low spreading factor. As a result, it improves spectral efficiency and is more insensitive to Doppler spread than the linear counterpart. To achieve a higher data rate, we propose two variants (half cycle sine and full cycle sine) of the M-ary nonlinear sine chirp spread spectrum technique based on virtual time-reversal mirror (VTRM). The proposed scheme uses different frequency bands to transmit chirp, and VTRM is used to improve the bit error rate due to high multipath. Its superior Doppler sensitivity makes it suitable for underwater acoustic communication. Furthermore, the proposed method uses a simple, low-power bank of matched filters; thus, it reduces the overall system complexity. Simulations are performed in different underwater acoustic channels to verify the robustness of the proposed scheme.<\/jats:p>","DOI":"10.1186\/s13638-021-01995-3","type":"journal-article","created":{"date-parts":[[2021,5,3]],"date-time":"2021-05-03T12:08:01Z","timestamp":1620043681000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror method"],"prefix":"10.1186","volume":"2021","author":[{"given":"Songzuo","family":"Liu","sequence":"first","affiliation":[]},{"given":"Habib Hussain","family":"Zuberi","sequence":"additional","affiliation":[]},{"given":"Yi","family":"Lou","sequence":"additional","affiliation":[]},{"given":"Muhmmad Bilal","family":"Farooq","sequence":"additional","affiliation":[]},{"given":"Shahabuddin","family":"Shaikh","sequence":"additional","affiliation":[]},{"given":"Waleed","family":"Raza","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,5,1]]},"reference":[{"key":"1995_CR1","doi-asserted-by":"publisher","DOI":"10.1007\/s12652-020-02719-z","author":"O Gupta","year":"2021","unstructured":"O. 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