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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

Published in:

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

Date of Publication:

Sep 2000

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