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Wireless packet switched communication systems and networks using adaptively steered antenna arrays

  • US 6,970,682 B2
  • Filed: 09/04/2002
  • Issued: 11/29/2005
  • Est. Priority Date: 04/27/2001
  • Status: Expired due to Term
First Claim
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1. A delayed cancellation method for use in a wireless routing device, the method comprising:

  • during a testing phase,causing a transmitter to transmit a plurality of tones through at least one transmitting antenna element, anddetermining a scale factor for each of said plurality of tones based on detected coupling between said at least one transmitting antenna element and at least one co-located receiving antenna element;

    during a operating phase,causing said transmitter to output a transmission signal to said at least one transmitting antenna element,tapping said transmission signal that is applied to said at least one transmitting antenna element,applying said determined scale factors to said tapped transmission signal, andcombining said resulting scaled tapped transmission signal with a signal received through said at least one receiving antenna element such that unwanted coupling in a resulting received signal is significantly reduced.

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