Patent ID: 6408018
Filing Date: 2002-06-18
Classification: H04B

Abstract:
A matched filter for computing a complex correlation between a sequence of complex input sample values and a complex code, comprising:a set of N changeover switches, each switch including a first input connected to receive a real value part of the input sample values, a second input connected to receive an imaginary value part of the input sample values and a control input connected to receive a control signal, wherein application of the control signal in a first state switches the real value part of the input sample values to a first output and switches the imaginary value part of the input sample values to a second output and application of the control signal in a second state switches output of the real value part of the input sample values to the second output and switches output of the imaginary value part of the input sample values to the first output; a first matched filter portion coupled to each of the first outputs of the N changeover switches for generating a real portion of the complex correlation; and a second matched filter portion coupled to each of the second outputs of the N changeover switches for generating an imaginary portion of the complex correlation.