Patent ID: 7177347
Filing Date: 2007-02-13
Classification: H04B

Abstract:
1. A synchronicity detection apparatus for detecting a timing of a spread code having a cycle length T, which is included in a reception signal, comprising: correlation coefficient generation means for dividing said spread code advancing a phase of said spread code every a certain first period, to generate a replica of said spread code; a matched filter which performs detection of correlation values of said replica code generated by said correlation coefficient generation means and said reception signal every a certain second period; a pseudo-random sequence generation means which generates a pseudo-random sequence from an initial value after supplying said pseudo-random sequence generated as said replica code; wherein said matched filter has m levels of shift register chips, T a larger value than the number of levels m, wherein the replicas generated by the correlation coefficient generator change in sequence each time m chips are advanced, the replicas inputted to the matched filter are updated by a value whose phase advances by m chips each time a searchable range of m chips per certain first period advances; wherein said synchronicity detection apparatus detects a local maximum correlation value over the searchable range equal to said m shift registers; the searchable range being repeated plural times over the length T of the spread code.