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Method and arrangement for antenna selection control in a radio receiver

  • US 5,991,613 A
  • Filed: 04/26/1995
  • Issued: 11/23/1999
  • Est. Priority Date: 10/26/1992
  • Status: Expired due to Term
First Claim
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1. A method for antenna selection control in a radio transmission/reception means, in particular of a base station or of a mobile part of a cordless telephone, with a measuring means for measuring first field strength values of signals received via two antennas, with a threshold value generator for formation of first threshold values, and having a central processor, comprising the steps of:

  • comparing, via the control processor, a first field strength value, respectively measured at one of the two antennas, with a respectively formed first threshold value, and that respectively controls a no-change to the respective other antenna, if the respectively measured first field strength value is larger than the respectively formed first threshold value or is equal to the respectively formed first threshold value; and

    forming the first threshold value such thata) the first threshold value, respectively formed for a first field strength value/threshold value comparison, remains respectively unchanged for a subsequent second field strength value/threshold value comparison, if, in a first field strength value comparison between a respective currently measured first field strength value and a respective last-measured first field strength value, the respective currently measured first field strength value is respectively smaller than the respective last-measured first field strength value or is equal to the respective last-measured first field strength value, whereby, for a subsequent second field strength value comparison, the respective last-measured first field strength value is respectively replaced by the respective currently measured first field strength value;

    b) for a subsequent second field strength value/threshold value comparison, the first threshold value, respectively formed for a first field strength value/threshold value comparison, is respectively replaced by a difference between a respective currently measured first field strength value and a correction value, if, in a first field strength value comparison between a respective currently measured first field strength value and a respective last-measured first field strength value, the respective currently measured first field strength value is respectively larger than the respective last-measured first field strength value, whereby, for a subsequent second field strength value comparison, the respective last-measured first field strength value is respectively replaced by the respective currently measured first field strength value.

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