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Method and apparatus for controlling switched antenna diversity systems

  • US 5,430,769 A
  • Filed: 11/23/1992
  • Issued: 07/04/1995
  • Est. Priority Date: 11/23/1992
  • Status: Expired due to Fees
First Claim
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1. A method for selecting one of at least two antennas in a communication unit, the method comprising the steps of:

  • receiving during a receiving period a signal from a currently selected one of the at least two antennas, the signal transmitted in a communications format comprising a plurality of bits having bit transitions;

    generating a reference clock signal based on the received signal;

    determining whether some of the bit transitions fall within a predefined time window corresponding to each transition, the predefined time window is determined by the reference clock signal;

    determining the quality of the incoming signal based on the number of bit transitions that fall outside of the predefined window;

    selecting for a subsequent receiving period one of the at least two antennas in response to the quality of the incoming signal; and

    whereinthe step of determining the quality of the incoming signal, comprises the sub-steps of;

    determining the total number of bit transitions that have occurred in the receive period;

    determining the number of bit transitions during the receiving period which have fallen outside of the predefined window; and

    calculating the percentage of bit transitions which fall outside of the predefined window from the total number of bit transitions.

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