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System for using rapid acquisition spreading codes for spread-spectrum communications

  • US 7,020,111 B2
  • Filed: 12/21/2000
  • Issued: 03/28/2006
  • Est. Priority Date: 06/27/1996
  • Status: Expired due to Term
First Claim
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1. A system for rapidly acquiring a spreading code used in a code division multiple access (CDMA) system, comprising:

  • a code generator for generating a plurality of P long codes, where P is a number of long codes in the plurality of long codes, with each long code having a length N chips, with each long code different from the other long codes in the plurality of long codes;

    a transmitter, coupled to said code generator, for transmitting, over a communications channel using radio waves, the plurality of long codes at a plurality of phase angles, respectively, on a carrier signal, with each phase angle in the plurality of phase angles different from other phase angles in the plurality of phase angles; and

    an acquisition circuit, coupled to the communications channel, for acquiring from the communications channel using said phase-acquisition circuit, the plurality of long codes, respectively, by searching, in parallel, N/P chips of each long code of the plurality of long codes.

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