Patent ID: 6967990

Claim:
An interference cancellation apparatus, applied in a CDMA communication system in which transmission rate information for each user in a plurality of users is known, and configured to sequentially cancel the interference among each of said users based on a rank of each user, said apparatus comprising: a rank determination unit configured to determine the rank of each user, from a highest ranked user to a lowest ranked user, based on the known transmission rate information of each user, wherein the known transmission rate of each user is not detected by measuring signal power; a plurality of interference cancellation units, connected by at least a number of stages corresponding to a number of said users, wherein each interference cancellation unit is configured to perform interference cancellation based on a rank provided in each stage, and each interference cancellation unit is configured to detect the transmission rate information; and a rank updating unit configured to update the rank to be used in interference cancellation units of a following stage based on the transmission rate information detected in each of said interference cancellation units.