Patent ID: 7580487

Claim:
A Carrier to Interference and Noise Ratio (CINR) estimation apparatus for use in a communication system, the CINR apparatus comprising: a channel pass device for generating channel pass signals by multiplying receiving signals by a predetermined sequence value, and outputting the channel pass signals; a channel estimator for calculating Sliding Average Window (SAW) channel estimation values using a SAW channel estimation method based on the channel pass signals; a CINR estimator for obtaining total signal power using the SAW channel estimation values, obtaining total noise and interference power using noise and interference signal values, which are obtained by subtracting the SAW estimation values from the channel pass signals, and calculating CINR estimation values using the total signal power and the total noise and interference power; and an error floor remover for calculating an error function of the CINR estimation values by performing an inverse calculation for the CINR estimation values based on real channel pass signal values and removing an error floor caused by the error function of the CINR estimation values from the CINR estimation values calculated by the CINR estimator.