Patent ID: 8064500

Claim:
A correlation calculation control circuit comprising: a correlation calculation integration section that performs correlation calculations and integrates correlation values, the correlation calculation integration section performing the correlation calculations on an identification code that is included in a received signal and identifies a transmission source of the received signal and a code replica that simulates an identification code of a given transmission source among a plurality of transmission sources; a comparison section that compares an integration count of the integration with a given reference count; an integration saturation detection section that detects whether or not the integration of the correlation values performed by the correlation calculation integration section has been saturated; and an integration saturation control section that determines whether the integration of the correlation values has been saturated due to cross-correlation or the received signal that is a strong signal, and controls whether or not to cause the correlation calculation integration section to continue the integration of the correlation values based on a result of the comparison performed by comparison section when the integration saturation detection section has detected that the integration of the correlation values has been saturated.