A multiuser detector based on blind signal separation

Conventional RAKE receiver distinguishes each user by crosscorrelation of the spread sequences and achieves detection of the desired user. In practical applications, however, the performance of receiver is much degraded due to the so-called near-far problem. Based on the theory of blind signal separation (BSS), this paper presents a new multiuser detector, which substantially enhances the near-far resistance ability of the receiver. The proposed method solves the order ambiguity inherent in the BSS problem by utilizing the structure information of the effective signature waveform. Finally, computer simulations confirm its performances.