Patent ID: 7307944

Claim:
A communication terminal apparatus that receives a signal where known signals, which correspond to the number of spreading codes multiplexed into an information signal and the information signal are multiplexed thereinto from a base station apparatus, comprising: a despreading and RAKE combining section that despreads the information signal multiplexed into the received signal using all spreading codes which are possible to be multiplexed into the received signal and RAKE combines the despreading result; a known signal determining section that specifies a known signal multiplexed into the received signal among the plurality of known signals; a spreading code number candidate obtaining section that obtains candidates for the number of spreading codes corresponding to the known signal determined by said known signal determining section; a spreading code determining section that determines whether spreading codes excepting for spreading codes allocated to a own station are multiplexed into the received signal based on the candidates for the number of spreading codes obtained by said spreading code number candidate obtaining section and a level of the RAKE combining result obtained by said despreading and RAKE combining section; and a JD operating section that performs joint detection operation using the spreading codes determined as being multiplexed into the received signal.