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Control method for high-frequency radio equipment and high-frequency radio system

  • US 7,664,535 B2
  • Filed: 06/26/2008
  • Issued: 02/16/2010
  • Est. Priority Date: 10/27/2004
  • Status: Expired due to Fees
First Claim
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1. A control method for high-frequency radio equipment in a base station that receives an extremely low radio wave from a portable equipment comprising the steps of:

  • receiving a signal of an extremely low radio wave which is spread-spectrum modulated according to an initial setting antenna pattern or an antenna pattern formed from an antenna status table;

    checking an identifier contained in the received data by despread-spectrum demodulation;

    only when the identifier matches an identifier stored on the receiving side, determining an state of communication environment by determining a code error rate of the received data, comparing the determined code error rate with a threshold value of a code error rate in favorable communication environment set in advance and comparing a difference between the both with a reference value calculated from a past adjustment history;

    decreasing a spreading ratio and increasing a transmission rate when the communication environment is stable;

    increasing a spreading ratio and decreasing a transmission rate when the communication environment is unstable;

    determining whether the error rate has become lower than the former value or not after the increase of the spread ratio;

    forming an antenna pattern specifying an antenna for reception from a plurality of arranged antennas by referring to the antenna status table when the error rate has not become lower;

    adjusting synthesized directivity of the plurality of arranged antennas according to the state of the communication environment by selecting an antenna based on the formed antenna pattern;

    returning the determination processing of the state of communication environment when the error rate has become lower the former value; and

    repeating from the reception processing of a signal of an extremely low radio wave which is spread-spectrum modulated to the adjustment processing of synthesized directivity of antenna.

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