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Method and apparatus for producing diversity gain of a received signal

  • US 5,548,837 A
  • Filed: 03/28/1994
  • Issued: 08/20/1996
  • Est. Priority Date: 03/28/1994
  • Status: Expired due to Term
First Claim
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1. In a receiver that includes an antenna, the antenna being characterized by a predetermined antenna pattern oriented at a first orientation angle and being used to receive signals that are subject to a time-variant fading condition, the antenna including a first antenna element and a second antenna element, the first antenna element being characterized by a first antenna pattern and the second antenna element being characterized by a second antenna pattern, the first antenna pattern and the second antenna pattern together producing the predetermined antenna pattern, a method for producing diversity gain of a signal received by the antenna, the method comprising the steps of:

  • a) determining a signal quality metric of the signal;

    b) comparing the signal quality metric to a quality threshold;

    when the signal quality metric is below the quality threshold;

    c) adjusting an amplitude of the signal received by the first antenna element based on a rotation angle to produce a first signal;

    d) adjusting an amplitude of the signal received by the second antenna element based on the rotation angle to produce a second signal; and

    e) combining the first signal and the second signal to produce a combined signal, such that the predetermined antenna pattern is effectively rotated from the first orientation angle by the rotation angle.

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