Doc.: IEEE 802.22-06/0070r0 Submission May 2006 Edgar Reihl, Shure IncorporatedSlide 1 Wireless...
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May 200 6 Edgar Reih l, Sh Slide 1 doc.: IEEE 802.22-06/0070r0 Submission Wireless Microphone Characteristics IEEE P802.22 Wireless RANs Date: 2006-05-15 N am e C om pany A ddress Phone em ail EdgarReihl Shure Incorporated 5800 W . Touhy A ve. N ilesIL 60714 847-600-8557 Reihl_Edgar@ shure.com 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 Chair Carl 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
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Transcript of Doc.: IEEE 802.22-06/0070r0 Submission May 2006 Edgar Reihl, Shure IncorporatedSlide 1 Wireless...
May 2006
Edgar Reihl, Shure Incorporated
Slide 1
doc.: IEEE 802.22-06/0070r0
Submission
Wireless Microphone CharacteristicsIEEE P802.22 Wireless RANs Date: 2006-05-15
Name Company Address Phone email Edgar Reihl Shure
Incorporated 5800 W. Touhy Ave. Niles IL 60714
847-600-8557 [email protected]
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 Chair Carl 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 [email protected].>
May 2006
Edgar Reihl, Shure Incorporated
Slide 2
doc.: IEEE 802.22-06/0070r0
Submission
Abstract
This presentation covers the basic technical and operational characteristics of wireless microphones. It is provided at the request of the 802.22 Spectrum Sensing Tiger Team.
May 2006
Edgar Reihl, Shure Incorporated
Slide 3
doc.: IEEE 802.22-06/0070r0
Submission
Wireless Microphone Characteristics
• Wireless Microphones are low power licensed secondary users of the television spectrum.
• Their primary application is real-time high quality audio transmission over short distances (< 300m).
• Wireless microphones are at the “front end” of the audio chain, and are often used “live”.
• Noise bursts and dropouts are not tolerated, and are perceived as a product quality/reliability issue by users.
• There is no “second chance” to re-do a live event.
May 2006
Edgar Reihl, Shure Incorporated
Slide 4
doc.: IEEE 802.22-06/0070r0
Submission
Wireless Microphone Characteristics
• Wireless microphones operate in locally unused TV channels; the same spectrum that WRANs will use.
• Operation in the U.S. is regulated by the FCC under Part 74 of the Code of Federal Regulations (47cfr74).
• In other countries, operation is regulated by different agencies, but with technical characteristics that are generally similar to those that apply in the U.S.
• Besides wireless microphones, there are wireless In Ear Monitors, IFB monitors, wireless intercoms, and wireless assist video devices (WAVDs) using the “vacant” TV channels.
May 2006
Edgar Reihl, Shure Incorporated
Slide 5
doc.: IEEE 802.22-06/0070r0
Submission
Technical Characteristics
• Frequency bands: 174 – 216, 470 – 608, 614 – 806 MHz.
• Maximum transmitter power: 50 mW (VHF); 250 mW (UHF). Most units operate with 10 – 50 mW output.
• Typical antenna gain: -2 to -6 dBi.
• Body absorption: 5 – 15 dB. Body pack transmitters suffer much more attenuation than handheld units.
• Typical ERP: -6 to 0 dBm.
• Height Above Ground Level: 1 m.
May 2006
Edgar Reihl, Shure Incorporated
Slide 6
doc.: IEEE 802.22-06/0070r0
Submission
Technical Characteristics
• Modulation: primarily analog FM, although other types are permitted. There are a few digital and hybrid analog/digital systems on the market.
• Audio frequency response: Typically 50 Hz – 15 kHz.
• Audio dynamic range: Typically > 100 dB. This is normally achieved through the use of analog companding.
• Occupied bandwidth: < 200 kHz. Most systems utilize the full bandwidth to maximize audio quality.
May 2006
Edgar Reihl, Shure Incorporated
Slide 7
doc.: IEEE 802.22-06/0070r0
Submission
May 2006
Edgar Reihl, Shure Incorporated
Slide 8
doc.: IEEE 802.22-06/0070r0
Submission
May 2006
Edgar Reihl, Shure Incorporated
Slide 9
doc.: IEEE 802.22-06/0070r0
Submission
Propagation Characteristics
United Center Tests – Chicago IL
May 2006
Edgar Reihl, Shure Incorporated
Slide 10
doc.: IEEE 802.22-06/0070r0
Submission
Handheld and BodypackWireless Microphone Transmitter
Power Levels
-90
-80
-70
-60
-50
-40
-30
1
11
21
31
41
51
62
72
82
92
102
112
122
132
142
152
162
173
183
193
203
213
223
233
243
253
263
273
284
294
Distance (feet)
Po
we
r a
t R
ec
eiv
er
(-d
Bm
)Propagation Characteristics
Handheld (dark trace)
Bodypack (light trace)
May 2006
Edgar Reihl, Shure Incorporated
Slide 11
doc.: IEEE 802.22-06/0070r0
Submission
Propagation Characteristics
Body Pack Signals at a radius of 50 feet
May 2006
Edgar Reihl, Shure Incorporated
Slide 12
doc.: IEEE 802.22-06/0070r0
Submission
Propagation Characteristics
Body Pack signals at a radius of 225 feet
May 2006
Edgar Reihl, Shure Incorporated
Slide 13
doc.: IEEE 802.22-06/0070r0
Submission
Propagation Characteristics
Green Trace = Wireless
Microphone
Propagation approximates
Rayleigh distribution
May 2006
Edgar Reihl, Shure Incorporated
Slide 14
doc.: IEEE 802.22-06/0070r0
Submission
Received SNR vs. RF Amplitude
Preferred minimum
signal level
May 2006
Edgar Reihl, Shure Incorporated
Slide 15
doc.: IEEE 802.22-06/0070r0
Submission
References
• IEEE 802.22 Tutorial “Mitigating the Effects of Unlicensed Devices on Wireless Microphones” by Ahren Hartman and Edgar Reihl; presented 14 November 2005
• United Center propagation data taken by Ahren Hartman and staff
• Receiver data taken by Garret Heath and Lakshminarayanan Thiagarajan
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