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

We present a computationally efficient algorithm for detection of superimposed signals in DS-CDMA communication systems. Using the EM algorithm we decompose the multiuser detection problem into a series of single user problems. The resultant structure includes the multistage detector of Varanasi et al. (1991) and the conventional single user detector (or linear decorrelator of Lupas et al. (1989)) as special cases.