Geodesic
An application of the expectation-maximization algorithm to interference rejection for direct-sequence spread-spectrum signals
Kybernetika, Tome 35 (1999) no. 1, p. [83].

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For a direct-sequence spread-spectrum (DS-SS) system we pose and solve the problem of maximum-likelihood (ML) sequence estimation in the presence of narrowband interference, using the expectation-maximization (EM) algorithm. It is seen that the iterative EM algorithm obtains at each iteration an estimate of the interference which is then subtracted from the data before a new sequence estimate is produced. Both uncoded and trellis coded systems are studied, and the EM-based algorithm is seen to perform well, outperforming a receiver that uses an optimized notch filter to remove the intereference, especially for large interference levels.
Classification : 93E10, 94A12
Mots-clés : maximum likelihood (ML) estimation; spread-spectrum signal; sequence estimation; narrowband interference; expectation-maximization (EM) algorithm; notch filter 
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     author = {Zhang, Quan G. and Georghiades, Costas N.},
     title = {An application of the expectation-maximization algorithm to interference rejection for direct-sequence spread-spectrum signals},
     journal = {Kybernetika},
     pages = {[83]},
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     volume = {35},
     number = {1},
     year = {1999},
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     zbl = {1274.93260},
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Zhang, Quan G.; Georghiades, Costas N. An application of the expectation-maximization algorithm to interference rejection for direct-sequence spread-spectrum signals. Kybernetika, Tome 35 (1999) no. 1, p. [83]. https://geodesic-test.mathdoc.fr/item/KYB_1999__35_1_a7/