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An efficient detection technique for synchronous CDMA communication systems based on the expectation maximization algorithm

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2 Author(s)
Borran, M.J. ; Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA ; Nasiri-Kenari, M.

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

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Vehicular Technology, IEEE Transactions on  (Volume:49 ,  Issue: 5 )