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Closed loop feedback system for improved down link performance

  • US 20050157683A1
  • Filed: 03/02/2005
  • Published: 07/21/2005
  • Est. Priority Date: 06/02/2000
  • Status: Active Grant
First Claim
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1. A method comprising steps of:

  • transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array associated with a first station, the beams transmitting a signature code embedded in each respective space-time coded signal, the signature codes being orthogonal so that a second station can separate and measure a channel impulse response corresponding to each space-time coded signal;

    measuring the channel impulse response for each space-time coded signal at the second station, the space-time coded signals including a selected set of least attenuated signals and a remaining set of most attenuated signals; and

    sending an indicia of the selected set of least attenuated signals from the second station to the first station.

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