A state-space approach to robust multiuser detection

In this paper, we develop a state-space approach to the blind multiuser detection problem with robustness against arbitrary mismatches in the desired user signature. A state-space approach to the decision directed detection problem and an algorithm for switching between the two detection techniques are also presented. The proposed switching algorithm can achieve an output signal-to-interference-plus-noise ratio (SINR) comparable to that of the minimum mean square error (MMSE) detector without any training even in the presence of desired user signature mismatches