Patent ID: 6944208

Claim:
A multistage interference signal canceling apparatus that cancels interference from a directional array combined signal that is received by an array antenna and array combined on a directivity-by-directivity basis, said apparatus comprising: an interference canceling unit for generating, at every stage, a replica signal of a user; delay means for delaying, at a stage other than a final stage, a received signal by a processing time of the interference canceling unit; canceling means for removing replica signals of all users from the received signal of each directivity, and obtaining a residual signal of the user; adding means for adding the replica signal and the residual signal on a per user basis, and outputting the result to an interference canceling unit of a next stage, wherein the interference canceling unit comprises: directivity selecting means for selecting the directional array combined signal on a per path basis; <despreading means for detecting a correlation value between the selected directional array combined signal and a spreading code, combining means for combining detected correlation values to generate a combined value; temporary determining means for temporarily determining the combined value to generate a temporarily determined value; re-spreading means for re-spreading the temporarily determined value to generate a re-spread signal; dividing means for sorting re-spread signals for every directivity, on a per path basis; and adding means for adding the re-spread signals sorted for every directivity to generate a replica signal.