Patent ID: 8130878

Claim:
An apparatus for estimating a carrier-to-interference-and-noise ratio (CINR) of a received signal in an orthogonal frequency division multiplexing (OFDM) system, the apparatus comprising: a band-pass filter for attenuating a signal region signal in a signal region of the received signal and passing a noise region signal in a noise region of the received signal; a first power calculator for calculating an interference and noise power of the noise region signal received from the band-pass filter; a second power calculator for calculating total received power of the received signal; a scaling processor for compensating for the interference and noise power due to the band-pass filter; and a ratio calculator for calculating a CINR based on the interference and noise power and the total received power, wherein the band-pass filter comprises a finite impulse response (FIR) filter, wherein the FIR filter serves as a filter for a channel estimator, and the band-pass filter is designed by defining a predetermined delay interval in the FIR filter, and wherein the first power calculator calculates the interference and noise power over a full region of the received signal, the full region including the signal region and the noise region.