DESPREADING DEMODULATOR

摘要

PROBLEM TO BE SOLVED: To provide a despreading demodulator for using a spread code generating circuit without the need for externally mounted components and for synchronization control.

SOLUTION: The despreading demodulator is provided with: sample-hold circuits 1a to 1g for holding spread signals; a first spread code generating circuit for generating spread codes; a second spread code generating circuit for generating spread codes resulting from inversely rearranging the spread codes above; a polarity conversion circuit 101 for carrying out polarity conversion so that nearly a half of the seven spread codes corresponding to newer or older spread signals exhibits two polarity states of inversion and noninversion for one period of a clock f2; multipliers 5a to 5g; an adder 6; a peak detector 7; and a spread code control circuit for alternately switching input of the spread codes from the first spread code generating circuit to the polarity conversion circuit and input of the spread codes from the second spread code generating circuit to the polarity conversion circuit at every detection of a peak.

COPYRIGHT: (C)2005,JPO&NCIPI