Interference canceller for a direct sequence CDMA receiver in a mobile radio communication system

摘要

In a direct sequence/code division multiple access (DS/CDMA) type interference canceller receiving apparatus having a delaying unit (12) for delaying a reception signal into zeroth through (N-1)-th delayed signals, zeroth through (N-1)-th path receivers (16-0 to 16-(N-1)) for demodulating the zeroth thorough the (N-1)-th delayed signals into zeroth through (N-1)-th demodulated signals, and a combining unit (16) for combining the zeroth through the (N-1)-th demodulated signals into a combined signal, an n-th path receivers (16-n) includes an n-th follow-up path detection unit (165-n) for detecting an n-th follow-up path for the n-th path receiver on the basis of a peculair spread code in response to an n-th coefficient control signal. The n-th follow-up path detection unit (165-n) produces n-th follow-up path information indicative of the n-th follow-up path. A follow-up path control unit (14) controls path reception timings for the zeroth through the (N-1)-th path receivers on the basis of searched path information supplied from a multi-path searcher (10) and zeroth through the (N-1)-th follow-up path information. The follow-up path control unit (14) supplies the delaying unit (12) with a path reception timing signal indicative of first through (N-1)-th delay amounts for first through (N-1)-th delay circuits (12-1 to 12-(N-1)) in the delaying unit.