Patent ID: 6275545
Filing Date: 2001-08-14
Classification: H04B

Abstract:
A matched filter comprising:(A) a plurality of correlation units each correlation unit comprising:(1) a multiplier for multiplying an input signal by a predetermined coefficient at predetermined intervals in a predetermined operation cycle of said matched filter to obtain a product, said coefficient sequentially varying at said intervals, and(2) an integrator for integrating the product obtained by said multiplier over said operation cycle into a correlation value;(B) control means for outputting a plurality of control signals at said intervals to direct said correlation units, respectively, to start operating; and(C) a multiplexer electrically connected to said correlation units for inputting the correlation values from said correlation units and sequentially outputting one of the inputted correlation values in response to said control signal and resetting said outputted one of said inputted correlation values,wherein said integrator of each of said correlation units comprises: an adder having a first input terminal, a second input terminal and an output terminal for adding first data inputted through said first input terminal with second data inputted through said second input terminal to obtain a sum of said first and said second data and for outputting said sum through said output terminal at said intervals; and hold means having an input terminal electrically connected to said output terminal of said adder and an output terminal electrically connected to said second input terminal of said adder and said multiplexer, for inputting said sum from said adder and outputting said sum to said adder at said intervals, and holding said sum as a preserved data until said preserved data is outputted to said multiplexer and reset in response to said control signal.