Patent ID: 8135079
Filing Date: 2012-03-13
Classification: H04B,H04L

Abstract:
1. An apparatus for estimating a signal-to-noise ratio (SNR), comprising: a fast Fourier transform (FFT) unit for performing a fast Fourier transform on a received signal to convert the received signal into a frequency domain signal; a preamble selector for extracting a preamble from the frequency domain signal; a correlator for correlating the preamble to a preamble reference signal generated by a receiver to calculate a correlation value; an entire power estimator for calculating entire power; a first delay unit for calculating a delay value of the correlation value; a first multiplier for multiplying the correlation value by the delay value of the correlation value to calculate a first intermediate value; a noise power estimator for calculating noise power using the first intermediate value and a delay value of the first intermediate value; and an estimating unit for using the entire power and the noise power to estimate the signal-to-noise ratio (SNR).