Browsing by Author "Nasiri-Kenari, Masoumeh"

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    An Efficient Detection Technique for Synchronous CDMA Communication Systems Based on the Expectation Maximization Algorithm
    (2000-09-20) Borran, Mohammad Jaber; Nasiri-Kenari, Masoumeh; Center for Multimedia Communications (http://cmc.rice.edu/)
    Maximum likelihood detection of superimposed signals in code-division multiple access (CDMA) communication systems has a computational complexity that is exponential in the number of users, and its implementation is practically prohibitive even for a moderate number of users. Applying the expectation maximization algorithm to this problem, we decompose the multiuser detection problem into a series of single-user problems, and thus present an iterative computationally efficient algorithm for detection of superimposed signals in synchronous direct-sequence CDMA communication systems. The resulting structure includes the well-known multistage detector as one of its special cases. With a proper choice of its parameters, the new detector can achieve the advantages of both the multistage and conventional detector and have good performance for both strong and weak users.