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Transceiver providing selectable frequencies and spreading sequences

  • US 5,029,180 A
  • Filed: 08/13/1990
  • Issued: 07/02/1991
  • Est. Priority Date: 03/23/1989
  • Status: Expired due to Term
First Claim
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1. An integrated circuit for transmitting and receiving digital information across various communications media comprising:

  • a frequency means for generating a reference frequency;

    transmitter means for locking a digital bit stream, a carrier signal and a pseudonoise chip sequence to produce a direct sequence spread spectrum signal for transmission to another integrated circuit;

    said transmitter means including a circuit means for modifying said pseudonoise chip sequence to provide selectable carrier frequencies for multiple communications channels on a single transmission medium;

    receiver means for acquiring and decoding a previously transmitted direct sequence spread spectrum signal using a local carrier signal and a local pseudonoise chip sequence to recover said digital bit stream;

    wherein said carrier signal and said pseudonoise chip sequence are substantially identical to said local carrier signal and said local pseudonoise chip sequence, respectively, and each are derived from, and integral multiples of, said reference frequency.

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