Borran, Mohammad JaberNasiri-Kenari, Masoumeh2007-10-312007-10-312000-09-202001-08-17M. J. Borran and M. Nasiri-Kenari, "An Efficient Detection Technique for Synchronous CDMA Communication Systems Based on the Expectation Maximization Algorithm," <i>IEEE Vehicular Technology Conference (VTC),</i> vol. 49, 2000.https://hdl.handle.net/1911/19738Journal PaperMaximum 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.engCode-division multiple-access (CDMA) systemsexpectation maximization (EM) algorithmmultiuser detectionspread spectrumJournal articleCode-division multiple-access (CDMA) systemsexpectation maximization (EM) algorithmmultiuser detectionspread spectrumhttp://dx.doi.org/10.1109/25.892550