Patent ID: 7532686
Filing Date: 2009-05-12
Classification: H04B,H04L

Abstract:
1. A correlator, comprising: an input unit which sequentially inputs signals in which a plurality of series are combined wherein the plurality of series are defined beforehand in a form such that a plurality of reference signals among the series are respectively changed for the series in which the plurality of reference signals are arranged on time axis; a delay unit which continuously delays the inputted signals; a plurality of storage units which store respectively a plurality of reference signals corresponding one of the plurality of series; and a correlation processing unit which performs correlation processing based on values of the plurality of delayed signals and values of the plurality of stored reference signals and which outputs respectively a plurality of values of correlation between the inputted signals and the plurality of series, wherein the signals inputted to said input unit and the plurality of reference signals have in-phase components and quadrature components, and a predetermined relationship that the plurality of series have is such that a value of in-phase component of a reference signal contained in one of the plurality of series is equal to a value of quadrature component of a reference signal contained in the other thereof whereas a value of quadrature component of the reference signal contained in one of the plurality of series is equal to a value of in-phase component of the reference signal contained in the other thereof, and wherein said correlation processing unit puts to a common use a multiplication between values of in-phase components and values of quadrature components that the plurality of delayed signals have and values of in-phase components and values of quadrature components that the plurality of stored reference signals have, and sums up in different combinations a plurality of multiplication results generated by the multiplication.