Patent ID: 6208683
Filing Date: 2001-03-27
Classification: H04B

Abstract:
A direct sequence/code division multiple access (DS/CDMA) type interference canceller receiving apparatus comprising:a delaying unit, supplied with a reception signal via different propagation paths, for delaying the reception signal for first through (N-1)-th delay amounts to produce zeroth through (N-1)-th delayed signals, where N represent a positive integer which is not less than two, the zeroth delayed signal being the reception signal as it is, the first through the (N-1) delayed signals being signals into which the reception signal are delayed for the first through the (N-1)-th delay amounts;zeroth through (N-1)-th path receivers, connected to said delaying unit and supplied with a peculiar spread code in common and with the zeroth through the (N-1)-th delayed signals, respectively, for demodulating the zeroth through the (N-1)-th delayed signals in response to zeroth through (N-1)-th coefficient control signals each indicative of adaptive tap coefficients to produce zeroth through (N-1)-th demodulated signals, respectively, said zeroth through said (N-1)-th path receivers including zeroth through (N-1)-th follow-up path detection units for detecting zeroth through (N-1)-th follow-up paths for said zeroth through said (N-1)-th path receivers on the basis of the peculiar spread code in response to the zeroth through the (N-1)-th coefficient control signals, respectively, said zeroth through said (N-1)-th follow-up path detection units producing zeroth through (N-1)-th follow-up path information indicative of the zeroth through the (N-1)-th follow-up paths, respectively;a combining unit, connected to said zeroth though said (N-1)-th path receivers, for combining the zeroth through the (N-1)-th demodulated signals into a combined signal;a multi-path searcher, supplied with the reception signal, for searching the different propagation paths in response to the reception signal to produce searched path information indicative of the different propagation paths; anda follow-up path control unit, connected to said multi-path searcher, the delaying unit, and said zeroth through said (N-1)-th path receivers, for controlling path reception timings for said zeroth through said (N-1)-th path receivers on the basis of the searched path information and the zeroth through the (N-1)-th follow-up path information, said follow-up path control unit supplying said delaying unit with a path reception timing signal indicative of the first through the (N-1)-th delay amounts.