The Research Of Multiuser Detection Algorithm For CDMA Communication

Spread Spectrum communication became one of the communication ways with wide developing prospect, and has being applied to military communication and civil communication extensively. Especially in recently about ten years , because CDMA communication rapidly is developing and the amount of user is increasing in striking speed , the capability of communication give prominence to fall .Because capacity of channel is limited by interference ,especially for the interference from the same channels and the adjacent channels . Therefore , multiuser detection technology has became a new hotspot in the research of mobile communication.After observing the correlative of Pseudo Noise code , we analyse the main cause of multi-access interference , and build the receiving model of multiuser system .In the thesis the optimum multiuser detectors with minimum probability of error and the near-optimum detectors are intrduced , and then PIC multiuser detection is improved on . By joining the thinking of decorrelating deletion and PIC detection , we build the decorrelating parallel interference cancellation feed back detections and analyse its capability . At one time the thesis look back the part parallel interference cancellation detection , and update the Algorithm of the multiuser with LMS Algorithm .At last , the thesis presentes the blind multiuser detection with adaptive Algorithm the blind multiuser detection base on Kalman Algorithm and probabilistic algorithms for blind adaptive multiuser detection.