US 7,003,415 B2 · Delay profile estimation apparatus and a correlating unit

Abstract

A delay profile estimation apparatus and a correlating unit to obtain delay profile with suppressed noise are disclosed. The delay profile estimation apparatus includes a receiving unit to receive a communication signal (received signal), a conversion unit to inverse-Fourier-transform a known pilot signal that consists of N samples, a correlating unit to obtain a correlation value between the inverse-Fourier-transformed known pilot signal and the received signal, the correlating unit being connected to the receiving unit and the conversion unit, and a delay profile generating unit for generating a delay profile of the received signal based on the correlation value. The correlating unit cyclically shifts N samples of the received signal, or the N samples of the known pilot signal when calculating the correlation value corresponding to a phase difference between the inverse-Fourier-transformed known pilot signal and the received signal.

Claims11

Dependent claims

A delay profile estimation apparatus, comprising:

a receiving unit configured to receive a communication signal;
a conversion unit configured to subject a known pilot signal that is made up of N samples to an inverse Fourier transform;
a correlating unit, coupled to said receiving unit and said conversion unit, configured to calculate a correlation value between the communication signal and the known pilot signal that has been subjected to the inverse Fourier transform;
and
a delay profile generating unit, coupled to said correlating unit, configured to generate a delay profile of the communication signal based on the correlation value,
wherein said correlating unit cyclically shifts the communication signal or the known pilot signal that has been subjected to the inverse Fourier transform and amounts to N samples, and calculates the correlation value corresponding to a phase difference between the communication signal and the known pilot signal that has been subjected to the inverse Fourier transform.

3 more elements

A correlating unit that is to be used in estimating a delay profile of a received signal, and configured to calculate a correlation value between the received signal and N samples of a known pilot signal that has been subjected to an inverse Fourier transform, wherein the correlation value corresponding to a phase difference between the communication signal and the known pilot signal that has been subjected to the inverse Fourier transform is calculated by cyclically shifting the communication signal or the known pilot signal that has been subjected to the inverse Fourier transform and amounts to N samples.

Dependencies are inferred from the claim text.

Delay profile estimation apparatus and a correlating unit

Life of this patent

Delay profile estimation apparatus and a correlating unit

Life of this patent

Abstract

Claims11