Abstract: Blind CDMA multiuser detection based on the expectation-maximization (EM) algorithm is studied, and an improved blind multiuser detection method based on the EM algorithm is proposed. To overcome conflict between computational complexity and the system performance, both multiuser interferences and noise are taken into account in the maximization likelihood estimate, and the likelihood function is modified. Simplification is achieved by decomposition of the estimation process. Numerical experiment is carried out. The results show that the proposed algorithm has good performance and low computation complexity.

Key words:

CDMA, blind multiuser detection, improved EM algorithm