Patent ID: 6912243

Claim:
A spread spectrum reception apparatus comprising: a RAKE-combination-unit; and a RAKE-combination signal detection unit, wherein said RAKE-combination-unit includes, a plurality of inverse-spread units, each of which inverse-spreads a spread spectrum signal that is spread-modulated and transmitted, said plurality of inverse-spread units configured to use an inverse-spread code that is delayed for a predetermined time, wherein a predetermined time-delayed signal is separated in time from the spread spectrum signal, a combining unit which RAKE-combines respective signals that are inverse-spread by said plurality of inverse-spread units, and a delay unit which delays the inverse-spread codes supplied to said inverse-spread units based on a delay control signal input from outside, and said RAKE-combination signal detection unit includes, a delay profile generation unit which generates a delay profile with a correlation electric power value obtained by converting a correlation value of the spread spectrum signal and a reference spread code into an electric power value and an associated delay time, a correction coefficient storing unit which stores already calculated correction coefficient based on time correlation between interference and thermal noise by each deviation of the delay time, a delay profile correction unit which measures a deviation between a delay time of a signal whose correlation electric power value is maximum and a delay time of a signal in the delay profile and corrects a correlation electric power value in the delay profile using a result obtained by multiplying a correction coefficient read from said correction coefficient storing unit corresponding to the measured deviation by a maximum electric power value in the delay profile; and a signal detection unit which detects a signal whose correlation electric power value becomes maximum in the delay profile generated by said delay profile generation unit and outputs delay time of a detected signal as a first delay control signal and a delay time of a signal whose correlation electric power value becomes maximum in a corrected delay profile corrected by said delay profile correction unit as a second delay control signal to the delay unit.