US 8,135,079 B2 · Apparatus and method of estimating signal-to-noise ratio

Abstract

The present invention relates an apparatus and method of estimating a signal-to-noise ratio (SNR) of a received signal when the received signal has a timing offset. An apparatus for estimating a signal-to-noise ratio (SNR) according to an exemplary embodiment of the present invention includes a fast Fourier transform (FFT) unit that performs a fast Fourier transform on a received signal to convert the received signal into a frequency domain signal; a preamble selector that extracts a preamble from the frequency domain signal; a correlator that correlates the preamble to a preamble reference signal generated by a receiver to calculate a correlation value; an entire power estimator that calculates entire power; a noise power estimator that applies a differential demodulation method to the correlation value to remove a timing offset and calculate noise power; and an estimating unit that uses the entire power and the noise power to estimate the signal-to-noise ratio (SNR).

Claims8

Dependent claims

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).

6 more elements

A method of estimating a signal-to-noise ratio (SNR), comprising:

performing a fast Fourier transform (FFT) on a received signal to convert the received signal into a plurality of frequency domain signals;
extracting a plurality of preambles from the plurality of frequency domain signals;
correlating the plurality of preambles to a plurality of preamble reference signals generated by a receiver to calculate a plurality of correlation values;
calculating a plurality of delay values of the plurality of correlation values;
multiplying the plurality of correlation values by the plurality of delay values to calculate a plurality of first intermediate values;
calculating noise power using a plurality of second intermediate values which are calculated from the plurality of first intermediate values and delay values of some of the first intermediate values;
and
estimating the signal-to-noise ratio (SNR) using the noise power.

5 more elements

Dependencies are inferred from the claim text.

Apparatus and method of estimating signal-to-noise ratio

Life of this patent

Apparatus and method of estimating signal-to-noise ratio

Life of this patent

Abstract

Claims8