Patent ID: 6104322
Filing Date: 2000-08-15
Classification: H04B

Abstract:
Apparatus for acquiring a code phase lock in a direct sequence spread spectrum system comprising:means (2) for receiving an input signalmeans (4) for converting the received input signal into inphase and quadrature components of a complex baseband signal;means (16, 18, 20) for performing a modulus squared function on said complex baseband signal; andcomparing means (26) for comparing said modulus squared function with a threshold value;characterised in that the apparatus further comprises:first and second correlators (6, 12, 8, 14) for respectively receiving said inphase and said quadrature components of said complex baseband signal;storage means (22) for storing the results of said modulus squared function prior to said comparing means (26);adding means (24) for adding together inputs to said storage means (22) with outputs therefrom which represent correlations spaced apart by one chip difference in code phase; andcontrol means (28) for controlling said correlators (6, 12, 8, 14) and said storage means (22).