The present invention is directed to an interference canceller for a DS-CDMA
communication system and a radio communication device that performs multi-rate
transmission and eliminates interference of high-rate channels by a simplified
structure. In a DS-CDMA communication system that performs a multi-rate transmission
including at least low-rate channels and high-rate channels, there is provided
an interference canceller that includes an array antenna interference replicating
unit. The interference replicating unit is used in high-rate channels that receive
signals received via array antenna elements and creates interference replicas of
the high-rate channels. The system also includes an adder 6, which subtracts
the interference replicas from the received signal via the array antenna elements.
Further a resultant interference-eliminated signal is applied to receivers for
the low-rate and high-rate channels.
