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System and apparatus for cascading and redistributing HDTV signals

  • US 8,665,143 B2
  • Filed: 01/11/2012
  • Issued: 03/04/2014
  • Est. Priority Date: 03/17/2008
  • Status: Expired due to Fees
First Claim
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1. A gateway for redistributing an information signal to a user device within a service area, comprising:

  • a spectrum detector capable of monitoring a specified spectrum and identifying a section of a specified spectrum including a plurality of cells of white space sufficient to accommodate a required bandwidth associated with the information signal,a transmitter for transmitting to the user device the information signal over the plurality of cells identified in the section of the spectrum; and

    a control device for transmitting and receiving bidirectional control messages,wherein the spectrum detector comprises;

    a tunable RF module for scanning specified spectrum sections and capturing any wireless signal present in the spectrum sections;

    an analog to digital converter for converting the captured wireless signal to a digital signal;

    a wavelet coefficient calculator for measuring an energy of the digital signal in each of a plurality of cells formed within the specified spectrum sections; and

    a sorting unit for selecting the k pieces of white space from the cells where the energy of the digital signal is under a threshold,wherein the wavelet coefficient calculator uses a wavelet function ψ

    α



    (t) providing a concentration of an energy of the cells, in both time and frequency within a finite interval, according to this equation;



    ψ

    α



    (t)dt=0.

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