DETECTION OF SIGNALS CONTIANING SINE-WAVE COMPONENTS THROUGH MEASURMENT OF THE POWER SPECTRAL DENSITY (PSD) AND CYCLIC SPECTRUM

• US 20100134699A1
• Filed: 12/05/2007
• Published: 06/03/2010
• Est. Priority Date: 06/15/2007
• Status: Active Grant

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Chen, Hou-Shin, Gao, Wen
• Granted Patent: US 8,396,166 B2
• Time in Patent Office: Days
• US Class Current: 348/731
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

A Wireless Regional Area Network (WRAN) receiver comprises a transceiver for communicating with a wireless network over one of a number of channels, and a signal detector for use in forming a supported channel list comprising those ones of the number of channels upon which an Advanced Television Systems Committee (ATSC) DTV (digital television) broadcast signal was not detected. The signal detector performs spectrum sensing as a function of power spectral density (PSD) and cyclic spectrum.

Claims

1. A method for use in a wireless endpoint, the method comprising:

selecting one of a number of channels;

downconverting a received signal on the selected channel for providing a downconverted signal;

decimating the downconverted signal for providing a decimated signal; and

detecting energy peaks in the decimated signal for detecting the presence of an incumbent signal on the selected channel.

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

determining a decision metric as a function of a power spectrum density of the decimated signal; and

comparing the determined decision metric to a threshold value for detecting the presence of the incumbent signal on the selected channel.

3. The method of claim 2, wherein the decision metric is represented by a parameter T, where

$T=\underset{f}{\max }$

S r 

( t , f ) .

4. The method of claim 2, wherein the decision metric is represented by a parameter T, where

$T=\underset{k}{\max }$

max f 



X k 

( t , f ) 

.

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

determining a decision metric as a function of a cyclic spectrum of the decimated signal; and

comparing the determined decision metric to a threshold value for detecting the presence of the incumbent signal on the selected channel.

6. The method of claim 5, wherein the decision metric is the maximum amplitude at frequency 0 over all cyclic spectrums.

7. The method of claim 1, wherein the incumbent signal is an Advanced Television Systems Committed (ATSC) signal.

8. The method of claim 1, wherein the downconverting step further includes

low pass filtering for providing the downconverted signal.

9. The method of claim 1, further comprising the step of:

marking an available channel list to indicate that the selected channel is available for use if no incumbent signal is present.

10. Apparatus comprising:

a downconverter for providing a downconverted signal from a selected channel;

a decimator for decimating the downconverted signal for providing a decimated signal; and

a processor for detecting energy peaks in the decimated signal for detecting the presence of an incumbent signal on the selected channel.

11. The apparatus of claim 10, wherein the processor (a) determines a decision metric as a function of a power spectrum density of the decimated signal;

and (b) compares the determined decision metric to a threshold value for detecting the presence of the incumbent signal on the selected channel.

12. The apparatus of claim 11, wherein the decision metric is represented by a parameter T, where

$T=\underset{f}{\max }$

S r 

( t , f ) .

13. The apparatus of claim 11, wherein the decision metric is represented by a parameter T, where

$T=\underset{k}{\max }$

max f 



X k 

( t , f ) 

.

14. The apparatus of claim 10, wherein the processor (a) determines a decision metric as a function of a cyclic spectrum of the decimated signal;

and (b) compares the determined decision metric to a threshold value for detecting the presence of the incumbent signal on the selected channel.

15. The apparatus of claim 14, wherein the decision metric is the maximum amplitude at frequency 0 over all cyclic spectrums.

16. The apparatus of claim 10, wherein the incumbent signal is an Advanced Television Systems Committed (ATSC) signal.

17. The apparatus of claim 10, further comprising:

a low pass filter for providing the downconverted signal.

18. The apparatus of claim 10, further comprising:

a memory for storing an available channel list to indicate that the selected channel is available for use if no incumbent signal is present.