1. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 1 Soo-Young Chang, Huawei Technologies Simulation Results for Spectral Correlation Sensing with Real DTV Signals IEEE P802.22 Wireless RANs Date: 2007-01-13 Authors: Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chairhttp://standards.ieee.org/guides/bylaws/sb-bylaws.pdf Carl R. StevensonCarl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org.patcom@iee.org >

2. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 2 Soo-Young Chang, Huawei Technologies INTRODUCTION Spectral correlation sensing schemes have been proposed in 22-05-0107-03-0000_CSU-Huawei_PHY_Proposal_ Presentation and included in the 22 standard draft v0.2. –Incumbent signals can be identified/sensed/detected calculating and using correlation values between spectral components of the received signals and spectral information of target incumbent signals pre-stored at the receiver. Simulation results are provided in this presentation. –For 11 real DTV signals provided, probabilities of misdetection are plotted for various SNR values for two probabilities of false alarm of 1 % and 10 %. –The real DTV processing procedure and simulation models suggested by Sensing tiger team are applied for these simulations: 22-06-0158-04-0000-Intial-Signal-Processing-for-DTV-Signal- Files and 22-06-0028-10-0000-Spectrum-Sensing-Simulation- Model

3. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 3 Soo-Young Chang, Huawei Technologies BRIEF DESCRIPTION OF THE SCHEME TV band signal sensing for one channel band –Use only spectral components – not time domain components Less sensitive on other parameters used to design TV band tuners – for example, Phase noise, etc. –Use FFT transform of received real DTV signals at the receiver for only one TV band –One example BW=F=6 MHz for one band case Sampling interval T=1/B=1/6 us, sampling rate=BW=6 MHz Frequency resolution (or frequency separation) F0=3 KHz Time period T0=1/F0=1/3 ms Number of samples needed N0=T0/T= 2 KHz Needs 2K point FFTs

4. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 4 Soo-Young Chang, Huawei Technologies BRIEF DESCRIPTION OF THE SCHEME Sensing procedure for DTV signals used –1000 frequency components taken in a 6 MHz band. –Compare these values using correlation method: compare the shape of spectrum of a received signal Calculate correlation between spectral components of the received signal and pre-stored spectral component values for DTV signals If this correlation value is larger than a predetermined value, the threshold, the judgment is that DTV signal exists. –A threshold is set to a value such that probability of false alarm becomes 1 %. Another is set for the probability of false alarm of 10 %. –Average frequency component values for several symbol periods can be used to have better sensing results, but in this simulation here the procedure is applied only for one symbol duration.

5. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 5 Soo-Young Chang, Huawei Technologies SPECTRA OF TV CHANNELS Analyzing the Signal Quality of NTSC and ATSC Television RF Signals.htm, Glen Kropuenske, Sencore NTSC signal spectrumDTV signal spectrum

6. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 6 Soo-Young Chang, Huawei Technologies ONE ILLUSTRATED EXAMPLE 8 measured spectral components Using 8 measured components, a correlation is calculated between frequency spectral components of a received signal and pre-stored spectral information of an incumbent signal. Spectral information of an incumbent signal

7. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 7 Soo-Young Chang, Huawei Technologies TARGET REAL DTV SIGNALS USED Field Strength (dBuV/m) Site NameChannelType of Capture WAS-311/48/0148Outdoor-30 feet13 WAS-311/35/0135Outdoor-30 feet16 WAS-311/36/0136Outdoor-30 feet17 WAS-086/48/0148Outdoor-30 feet35 WAS-006/34/0134Outdoor-30 feet41 WAS-003/27/0127Outdoor-30 feet43 WAS-051/35/0135Outdoor-30 feet44 WAS-049/39/0139in-home44.8 WAS-032/48/0148in-home46.3 WAS-068/36/0136Outdoor-30 feet48 WAS-049/34/0134in-home48.2

8. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 8 Soo-Young Chang, Huawei Technologies SIMULATION RESULTS (1) Probabilities of misdetection vs SNRs under false detection probability=10%

9. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 9 Soo-Young Chang, Huawei Technologies SIMULATION RESULTS (2) Probabilities of misdetection vs SNRs under false detection probability=1%

10. doc.: IEEE 802.22-07/0034r0 Submission January 2007 Slide 10 Soo-Young Chang, Huawei Technologies CONCLUSION Simulation results show that the spectral correlation sensing schemes have acceptable performance.