IEEE 802.22-07/0311r0



IEEE P802.22

Wireless RANs

|Spectrum Sensing Tiger Team Minutes |

|Date: 2007-06-19 |

|Author(s): |

|Name |Company |Address |Phone |Email |

|Apurva Mody |BAE Systems |P. O. Box 868, MER 15-2350, |(404)-819-0314 |Apurva_mody@ |

| | |Nashua, NH 03061-0868 | | |

Attendance

|  |27-Jun |

|Edward Au |  |

|Danijela Cabric |  |

|Winston Caldwell |X |

|Dave Cavalcanti |  |

|Soo-Young Chang |X |

|Hou-Shin Chen |  |

|Gerald Chouinard |X |

|Chris Clanton |X |

|Carlos Cordeiro |  |

|Neiyer Correal |  |

|Upkar Dhaliwal |  |

|Vasanth Gaddam |X |

|Wen Gao |  |

|Monisha Ghosh |  |

|Wendong Hu |  |

|Baowei Ji |  |

|Sang-Won Kim |  |

|Gwangzeen Ko |  |

|Steve Kuffner |  |

|Spyros Kyperountas |  |

|Augustine Leng |  |

|Ying-Chang Liang |  |

|Kyutae Lim |  |

|Suahs Mathur |  |

|Apurva Mody |X |

|Sai Nandagopalan |  |

|Ahmed Sadek |  |

|Steve Shellhammer |  |

|Myung-Sun Song |  |

|Kathyayani Srikanteswara |X |

|Carl Stevenson |  |

|Victor Tawil |  |

|Anh Tuan |  |

|Jay Unnikrishnan |X |

|George Vlantis |  |

|Kelly Williams |  |

|Terry Tianyu Wu |X |

|Ray Wang |  |

|Kwon Yeong-Hyeon |  |

|Yonghong Zeng |X |

Minutes from June 27 2007 Conference Call

1 Agenda

• Attendance

• Chair to ask if anyone is not familiar with the IEEE patent policy

o

• Review text on sensing techniques (See list below)

• New business

|Sensing Technique |Reviewed |Owner |

|Outline of Annex |Yes |Steve |

|Energy Detector |Yes |Steve |

|Eigenvalue Sensing Technique |Yes |Yonghong |

|Multi-resolution spectrum sensing (MRSS) | |Kyutae |

|ATSC Signature Sequence Correlation Sensing Technique | |Wen, Monisha and Steve |

|ATSC FFT-based Pilot Sensing Technique |Yes |Monisha |

|ATSC PLL-based Pilot Sensing Technique |Yes |Vasanth |

|Wireless Microphone Covariance Sensing Technique |Yes |Yonghong |

|ATSC Pilot Covariance Sensing Technique |Yes |Yonghong |

|ATSC Spectral Correlation Sensing Technique |Yes |Soo-Young |

|ATSC Cyclostationary Sensing Technique | |Wen |

2 Notes

• Everyone was familiar with the IEEE patent policy

• We reviewed the document on ATSC PLL-based Pilot Sensing Technique. Vasanth Gaddam presented the document

- Apurva – What are the TV receiver frequency offset specs? Can the algorithm work when a large frequency offset is present? Vasanth said that the TV receiver frequency offset specs should be a few ppm but did not know the exact number. The algorithm may be modified so that it starts at a higher values of F_ini_1 and F_ini_2 to accommodate any frequency offsets that are present.

- Gerald had some comments on the initial frequency offset that you start with and what the tolerance of the system. He had some other comments on drift in the frequency of the PLL and scenarios where the error is likely to go to zero. There may be cases where either F1 or F2 are likely to go to zero or be so small that the threshold may not be overcome even when the DTV signal is present.

- Apurva – Need to include the table on performance in the same way as other documents.

• We reviewed the document on ATSC Pilot Covariance Sensing Technique as well as Wireless Microphone Covariance Sensing Technique.

- Gerald – Why propose two methods when one is slightly better than the other. Yonghong suggested that the CAV based method is more easier to implement. Gerald asked Yonghong to merge documents into a single section. Chris had some comments on simulations on wireless microphone sensing based on the new model.

• We reviewed the document on ATSC Spectral Correlation Sensing Technique.

- Clarification on section 2a) Sensing procedure for TV signals The NTSC detection is accomplished with F417/F1200> threshold, where the 417th FFT bin represents the NTSC carrier frequency and the 1200th bin represents a frequency with an expected minimum signal amplitude.

- The ATSC detection is accomplished with F103/F1200> threshold, where the 103th FFT bin represents the ATSC pilot carrier frequency and the 1200th bin represent a frequency with expected minimum signal amplitude.

- Clarification on section 2a) Sensing procedure for wireless microphone signals Chris indicated that the width of the microphone signal will depend on how loud or soft the speaker will be which determines the actual frequency deviation. Soo Young asked for more information on typical microphone signal and he will modify the text accordingly.

- Section 5: Soo Young explained that more frequency components were used near the pilot area to produce the results indicated in Table 1 to improve the sensing performance. This is called 'emphasis'. Gerald suggested to include the performance for 5 ms rather than 2 m in

- Table 1 since 5 ms will be used for sensing TG1 beacons. It will therefore be more frequent than 2 ms as a sensing window.

Next meeting on July 10th, 8pm EDT.

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Abstract

Minutes from Spectrum Sensing Tiger Team conference calls. – June 27, 2007

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