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• W2596090938 abstract "Despreading signal at receiver side requires prior knowledge of the spreading sequences in direct-sequence code division multiple access (DS-CDMA) system. However, the knowledge of spreading sequences is always unknown to the receiver in non-cooperative communication. Therefore the receiver has to estimate the spreading sequences in a blind manner. This study presents a novel algorithm to estimate the spreading sequences for asynchronous long-code (LC) DS-CDMA signals. By investigating the projection characteristics of the signal subspace, the authors treat the spreading sequence estimation problem as a discrete optimisation search problem that can be solved efficiently by modern optimisation search methods. Moreover, they design a successive subspace deflation scheme to alleviate interference from other users. Numerical experiments demonstrate that the proposed algorithm provides good estimation of the spreading sequences for LC-DS-CDMA signals. Compared with the existing algorithms, the proposed algorithm exhibits much better performance in large system load scenario with low signal-to-noise ratio." @default.
• W2596090938 created "2017-03-23" @default.
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• W2596090938 date "2017-08-01" @default.
• W2596090938 modified "2023-10-14" @default.
• W2596090938 title "Blind spreading sequence estimation algorithm for long‐code DS‐CDMA signals in asynchronous multi‐user systems" @default.
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• W2596090938 doi "https://doi.org/10.1049/iet-spr.2016.0506" @default.
• W2596090938 hasPublicationYear "2017" @default.
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