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Method and instrument for measuring receiving SIR and transmission power controller

  • US 6,034,952 A
  • Filed: 12/12/1997
  • Issued: 03/07/2000
  • Est. Priority Date: 04/12/1996
  • Status: Expired due to Term
First Claim
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1. A received SIR (signal-to-interference plus noise power ratio) measuring method of a communications system using a signal including a known pilot signal inserted into an information signal at predetermined intervals, said method comprising:

  • the step of measuring received wave power in which average value is adopted as the received wave power wherein the step of measuring received wave power comprising steps of;

    carrying out interpolating coherent detection of information data symbols from received data symbols by using the pilot signal;

    computing power values of the information data symbols decided by interpolation integrating the power values of the information data symbols in the predetermined interval of the pilot signal to compute said average value of the power values;

    the step of measuring received interference wave power in which a ratio is computed of an integral of the information data symbols to an integral of the power differences wherein the step of measuring received interference wave power comprising steps of;

    computing differences between power values of the decided information data symbols and power values of a fading envelope at same sampling times;

    obtaining an integral of said differences of the power values in the predetermined intervals of the pilot signal; and

    the step of computing a ratio of the received desired wave power to the received interference wave power, wherein the step of measuring received interference wave power comprising steps of the computed ratio is adopted as the SIR.

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