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Method and apparatus for signal strength measurement and antenna selection in cellular radiotelephone systems

  • US 4,704,734 A
  • Filed: 02/18/1986
  • Issued: 11/03/1987
  • Est. Priority Date: 02/18/1986
  • Status: Expired due to Term
First Claim
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1. A method for determining which of three sector antennas of a multisectored cell in a cellular radiotelephone system receives the strongest radio frequency (RF) signal, comprising the steps of:

  • (a) rectifying a RF signal induced in a primary sector antenna coupled to a diversity input of a first voice channel receiver branch to produce an analog signal related to the magnitude of said induced RF signal and converting said analog signal into a plurality of digital signal representations thereof;

    (b) storing said digital signal reprsentations in a plurality of storage locations;

    (c) sequentially sampling RF signals induced in first and second sector antennas which are switchably coupled to a diversity input of a second voice channel receiver branch each said first and second sector antenna having a geographic coverage area adjacent to a geographic coverage area of said primary antenna;

    (d) rectifying each sequentially sampled RF energy signal to produce sequential analog signals related to the strength of each said sequentially sampled RF signal and converting each said sequential analog signal into a corresponding sequential digital signal representation;

    (e) cyclically storing each said sequential digital representation in first and second storage locations associated with said first and second sector antenna;

    (f) reading at least one of said plurality of storage locations and both said first and second storage locations; and

    (g) determining which stored digital representation represents the RF signal with the greatest magnitude and identifying which antenna received the RF signal with the greatest magnitude.

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