METHOD AND APPARATUS FOR DETECTING SIGNAL USING CYCLO-STATIONARY CHARACTERISITICS

• US 20100205234A1
• Filed: 08/21/2008
• Published: 08/12/2010
• Est. Priority Date: 09/14/2007
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Park, Changhyun, Lim, Sunmin, Kim, Chang-Joo, Kim, Sang-Won, Ko, Gwangzeen, Song, Myung Sun
• Granted Patent: US 8,639,736 B2
• Time in Patent Office: Days
• US Class Current: 708/205
• CPC Class Codes: H04L 27/00 Modulated-carrier systems
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14

Abstract

A method and apparatus for detecting a signal using a cyclo-stationary characteristic value is provided. A method of detecting a signal using a cyclo-stationary characteristic value includes: calculating cyclo-stationary characteristic values with respect to a cyclic frequency domain of an input signal; multiplying the calculated cyclo-stationary characteristic values with each other; and detecting the signal from the input signal based on the result of the multiplication.

Claims

1. A method of detecting a signal using a cyclo-stationary characteristic value, the method comprising:

calculating cyclo-stationary characteristic values with respect to a cyclic frequency domain of an input signal;

multiplying the calculated cyclo-stationary characteristic values with each other; and

detecting the signal from the input signal based on the result of the multiplication.

2. The method of claim 1, wherein the calculating comprises:

converting the input signal into a frequency domain signal using a Fourier transform;

segmenting the cyclic frequency domain of the converted frequency domain signal into partial unit domains;

selecting, from the partial unit domains, a first partial unit domain that is predicted to show a cyclo-stationary characteristic; and

calculating cyclo-stationary characteristic values with respect to the selected first partial unit domain.

3. The method of claim 1, wherein the calculating comprises:

converting the input signal into a frequency domain signal using a Fourier transform;

segmenting the cyclic frequency domain of the converted frequency domain signal into partial unit domains;

selecting, from the partial unit domains, a first partial unit domain that is predicted to show a cyclo-stationary characteristic; and

calculating the cyclo-stationary characteristic values using a maximum value among frequency components of cyclic frequencies that are included in the selected first partial unit domain.

4. The method of claim 1, wherein the calculating comprises:

converting the input signal into a frequency domain signal using a Fourier transform;

segmenting the cyclic frequency domain of the converted frequency domain signal into partial unit domains;

selecting, from the partial unit domains, a first partial unit domain that is predicted to show a cyclo-stationary characteristic; and

calculating the cyclo-stationary characteristic values by changing a number of calculations with respect to the selected first partial unit domain and a second partial unit domain excluding the first partial unit domain from the partial unit domains.

5. The method of claim 1, further comprising:

normalizing the calculated cyclo-stationary characteristic values.

6. The method of claim 5, wherein the normalizing comprises normalizing the cyclo-stationary characteristic values based on a root means square (RMS) value of the cyclo-stationary characteristic value of the input signal.

7. The method of claim 1, wherein the detecting comprises:

comparing the result of the multiplication with a predetermined threshold value; and

when the result of the multiplication is greater than the threshold value, determining the signal exists in the input signal to detect the signal from the input signal.

8. A method of detecting a signal using a cyclo-stationary characteristic value, the method comprising:

calculating cyclo-stationary characteristic values with respect to a cyclic frequency domain of an input signal;

normalizing the calculated cyclo-stationary characteristic values;

multiplying the normalized cyclo-stationary characteristic values with each other to obtain the result of the multiplication; and

detecting the signal from the input signal based on the result of the multiplication.

9. The method of claim 8, wherein the normalizing comprises normalizing each of the cyclo-stationary characteristic values based on an RMS value.

10. An apparatus for detecting a signal using a cyclo-stationary characteristic value, the method comprising:

a calculation unit configured to calculate cyclo-stationary characteristic values with respect to a cyclic frequency domain of an input signal and multiply the calculated cyclo-stationary characteristic values; and

a detection unit configured to detect the signal from the input signal based on the result of the multiplication.

11. The apparatus of claim 10, wherein the calculation unit is configured to convert the input signal into a frequency domain signal using a Fourier transform, divide the cyclic frequency domain of the converted frequency domain signal into partial unit domains, select, from the partial unit domains, a first partial unit domain that is predicted to show a cyclo-stationary characteristic, and calculate the cyclo-stationary characteristic values using a maximum value among frequency components of cyclic frequencies that are included in the selected first partial unit domain.

12. The apparatus of claim 10, wherein the calculation unit is configured to convert the input signal into a frequency domain signal using a Fourier transform, divide the cyclic frequency domain of the converted frequency domain signal into partial unit domains, select, from the partial unit domains, a first partial unit domain that is predicted to show a cyclo-stationary characteristic, and calculate the cyclo-stationary characteristic values by changing a number of calculations with respect to the selected first partial unit domain and a second partial unit domain excluding the first partial unit domain from the partial unit domains.

13. The apparatus of claim 10, wherein the calculation unit is configured to normalize the cyclo-stationary characteristic values based on an RMS value of the cyclo-stationary characteristic value of the input signal.

14. The apparatus of claim 10, wherein the detection unit is configured to compare the result of the multiplication with a predetermined threshold value, and when the result of the multiplication is greater than the threshold value, determine the signal exists in the input signal to detect the signal from the input signal.

15. An apparatus for detecting a signal using a cyclo-stationary characteristic value, the apparatus comprising:

a calculation unit configured to calculate cyclo-stationary characteristic values with respect to a cyclic frequency domain of an input signal, normalize the calculated cyclo-stationary characteristic values, and multiply the normalized cyclo-stationary characteristic values with each other; and

a detection unit configured to detect the signal from the input signal based on the result of the multiplication.

16. The apparatus of claim 15, wherein the calculation unit is configured to normalizing each of the cyclo-stationary characteristic values based on an RMS value.