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Complementary beamforming methods and apparatuses

  • US 7,099,698 B2
  • Filed: 11/03/2003
  • Issued: 08/29/2006
  • Est. Priority Date: 11/04/2002
  • Status: Active Grant
First Claim
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1. A method for use in a wireless communication system, the method comprising:

  • outputting at least one signal suitable for causing a smart antenna to transmit at least one complementary beam, said at least one signal being operatively configured to cause said smart antenna to perform single beam complementary beamforming (SBCBF);

    causing said smart antenna to transmit said at least one complementary beam based on said at least one signal; and

    configuring said at least one signal to cause said smart antenna to perform said SBCBF by transmitting energy at a detectable transmit power level in all smart antenna-supported directions while substantially preserving a shape of at least one main transmit beam having a transmit power level that is significantly greater than said detectable transmit power level, said SBCBF being operatively performed by said smart antenna that is operatively associated with a base station within a wireless communication system, said base station including a Butler matrix network configured to form said at least one main beam using said smart antenna, and further configured to provide at least one of post-combining SBCBF or pre-combining SBCBF.

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