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Adaptive beam-forming system using hierarchical weight banks for antenna array in wireless communication system

  • US 20050206564A1
  • Filed: 03/04/2005
  • Published: 09/22/2005
  • Est. Priority Date: 03/19/2004
  • Status: Active Grant
First Claim
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1. A wireless communication system, comprising:

  • an antenna array structure having a plurality of antenna elements that receive and transmit radio-frequency signals;

    a plurality of radio-frequency units and frequency converters configured to transform received RF signals to receive analog base-band signals and transform analog transmit base-band signals into a transmit RF signals;

    a plurality analog-to-digital converters configured to convert the receive analog base-band signals into a receive digital base-band signals and a plurality of digital-to-analog converters configured to convert transmit digital base-band signals into transmit analog base-band signals;

    a multipath delay profile estimation unit configured to estimate delays of multipath signal components based on the receive digital base-band signals; and

    a plurality of beam-forming units configured to process the multipath signal components, wherein each of the beam-forming units comprise;

    a set of hierarchical weight banks that store pre-calculated weights in accordance with pre-specified beam look directions;

    a digital processing unit configured to estimate a signal metric, select the best weights from weight banks based on the estimated signal metric, and apply the selected weights to the received digital signal to shift a beam pattern to point to the best beam look direction.

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