Device and method for perch channel reception for mobile radio communication terminal according to cdma

Abstract

A perch channel reception device of a mobile radio communication terminal for successively receiving perch channels of base stations around the terminal includes a delay profile generator, a base station scrambling timing detector, a timing corrector, a correlator with time window, and a perch channel demodulator. The delay profile generator detects frame boundary symbols included in a received modulated radio wave and thereby generates a delay profile. The base station scrambling timing detector detects scrambling timing of each base station based on the delay profile. Thereafter, a base station is selected from the base stations one by one as the object of perch channel reception. The timing corrector calculates corrected scrambling timing of the selected base station using a timing correction supplied from the correlator with time window and the scrambling timing of the selected base station based on the delay profile. The correlator with time window takes the correlation between the received modulated radio wave and the scrambling code of the selected base station, with respect to a plurality of comparison starting times in a time window around the corrected scrambling timing, and thereby generates correlation data and the timing correction. The perch channel demodulator demodulates the correlation data into logic data including information concerning the selected base station.