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Fast acquisition module for a code division multiple access (CDMA) wireless local loop (WLL) system

  • US 6,693,890 B1
  • Filed: 06/14/2000
  • Issued: 02/17/2004
  • Est. Priority Date: 03/03/2000
  • Status: Expired due to Fees
First Claim
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1. An acquisition module for acquiring signal timing in a CDMA system comprising:

  • a register for storing and organizing synchronization code;

    at least 4 match filters for match filtering between I/Q samples and the corresponding synchronization code;

    at least 4 absolute value blocks for determining absolute values of match filtering results;

    a summation function for summing results obtained through match filtering and through absolute value taking; and

    a control logic for controlling the acquisition process;

    characterized in that the acquisition module loads a 64-bit section of synchronization code and I/Q complex samples and match filters them in a simultaneous manner and, upon registering a value greater than a preset threshold, acquires an initial timing, the initial timing being verified over the remaining 64-bit sections of synchronization code using the same control circuitry used in acquiring the timing.

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