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Permission-based multiple access communications systems

  • US 8,428,104 B2
  • Filed: 07/01/2009
  • Issued: 04/23/2013
  • Est. Priority Date: 07/01/2009
  • Status: Active Grant
First Claim
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1. A method for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum and shared spreading codes, comprising:

  • generating a first product signal by spreading first symbols of a first amplitude modulated signal using a first spreading code;

    generating a second product signal by spreading second symbols of a complimentary amplitude modulated signal using a second spreading code;

    combining said first and second product signals to form a protected data communication signal including first data recoverable by at least one receiver of a plurality of receivers; and

    combining a global data communication signal and said protected data communication signal to form an output signal having a spread spectrum format;

    wherein said global data communication signal is generated using a digital modulation process and includes second data recoverable by all of said plurality of receivers.

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