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CODE DIVISION MULTIPLE ACCESS MOBILE COMMUNICATION SYSTEM

  • US 20100278148A1
  • Filed: 07/14/2010
  • Published: 11/04/2010
  • Est. Priority Date: 05/13/1998
  • Status: Active Grant
First Claim
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1. A mobile terminal for use in a code division multiple access, CDMA, mobile communication system, the mobile terminal comprising:

  • an antenna which receives a received signal; and

    a cell search circuit which receives, as an input signal, a baseband perch channel signal included in the received signal, the perch channel signal including a control signal spread by a long code and a first short code in a data symbol section of one slot section on the perch channel, a repetition of a second search code being provided in a long code masked symbol section of said one slot section, and a first search code, also being provided in said long code masked symbol section,wherein the cell search circuit includes a timing synchronization part, a second search code detection part and a long code detection part,the timing synchronization part including a first search code generator arranged to generate the first search code in response to a timing signal and a correlator for maximizing a correlation value between said received signal and the generated first search code,the second search code detection part including a code generator arranged to generate successive candidate second search codes and a processor for determining which of the candidate second search codes corresponds to the second search code of the base station by analyzing correlation values of the candidate second search code and the received signal within the long code masked symbol section, andthe long code detection part including a code generator arranged to generate candidate long codes and a code generator arranged to generate the first short code and a processor for determining which of the candidate long codes corresponds to the long code by analyzing correlation values of the candidate long code multiplied by the first short code and the received signal within the data symbol section, andwherein said first and second search codes have a spreading factor shorter than the long code and the first short code.

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