Patent ID: 6794858
Filing Date: 2004-09-21
Classification: G01R

Abstract:
A receiving level measuring circuit, comprising:received signal strength indicator (RSSI) detection means for detecting field strength of a received signal; quadrature detection means for performing a quadrature detection of the received signal; desirable/interference wave detection means for detecting a plurality of desirable wave components, a plurality of interference wave components, and a plurality of frequency error vectors from the received signal submitted to the quadrature detection; frequency error correction-value acquisition means for previously storing a correction value corresponding to the frequency error and then adding and averaging the detected plurality of frequency error vectors so as to get the correction value corresponding to the frequency error submitted to a unit conversion; frequency error correction means for adding up the detected plurality of desirable wave components and for correcting the desirable wave components using the correction value; desirable wave component electricity conversion means for converting the corrected desirable wave components into electricity to get a desirable wave power level; and desirable wave level correction means for outputting the desirable wave power level as a desirable wave receiving level if the detected field strength is lower than or equal to a predetermined specific value or for correcting the desirable wave power level by adding the detected field strength level to the desirable wave power level and then outputting the corrected level as a desirable wave receiving level if the detected field strength is more than the specific value.