Patent ID: 7072384

Claim:
A fixed pattern detection apparatus which is used in a CDMA communication radio reception apparatus, and detects from a received signal a fixed pattern generated by spreading by a spreading code an in-phase component and a quadrature component of a pattern obtained by repeating a signature pattern formed from a plurality of symbols, comprising: a reception memory which temporarily stores received signals; correlation means for calculating signature pattern correlation values for respective blocks by product-sum operation based on received signals of the respective blocks obtained by dividing a received signal at a predetermined reference timing out of the received signals stored in said reception memory; in-phase addition means for adding, in phase for a plurality of blocks, in-phase components and quadrature components of the signature pattern correlation values obtained by said correlation means; power value calculation means for calculating individual power values from in-phase addition values obtained by said in-phase addition means; addition means for summing up the individual power values obtained by said power value calculation means to calculate a detection power value corresponding to the received signal; and detection determination means for comparing the detection power value obtained by said addition means with a threshold to determine whether a fixed pattern has been detected.