ABSTRACT
TV white spaces offer an exciting opportunity for increasing spectrum availability, but white space devices (WSDs) cannot interfere with primary users, including TV channels and wireless microphones (mics). Mics are particularly challenging because their use is dynamic and it is hard to avoid interference since mic receivers are receive-only devices. For this reason the FCC and other regulatory agencies have made very conservatives rules that require WSDs to vacate any TV channel that is used by a mic. However, our measurements show that mics typically require only 5% of a channel, wasting as much as 95% of the spectrum.
We present SEISMIC, a systems that enables WSDs and mics to operate on the same TV channel with zero audible mic interference. SEISMIC implements a MicProtector to measure the interference at the mic receiver and a signaling protocol to notify the WSD of impending interference. This allows the WSD to optimize its transmission (e.g. through subcarrier suppression) without impacting mics. We motivate and describe SEISMIC and present a detailed performance analysis that shows that SEISMIC can regain up to 95% of the spectrum in single mic scenarios, and up to 85% in many (10+) mic environments.
- Audio-Technica Tutorial on FM Mic Squelching, http://www.audio-technica.com/cms/site/557bfecb9ab0cfee/index.html/.Google Scholar
- Connecting America: The Nation Broadband Plan (FCC), http://download.broadband.gov/plan/national-broadband-plan.pdf.Google Scholar
- Private communication with J. Stoffo and J. Eskew of Professional Wireless Systems, http://www.professionalwireless.com/.Google Scholar
- Ultra-wideband Technology for Short-Range, High-Rate Wireless Communications, http://www.ieee.or.com/Archive/uwb.pdf.Google Scholar
- Unlicensed Operation in the TV Broadcast Bands. May 2004.Google Scholar
- Demonstration of a Prototype Dynamic Spectrum Access System, Philips Research. In DySPAN demo session, 2008.Google Scholar
- FCC press release, Evaluation of the Performance of Prototype TV-Band White Space Devices. November 2008.Google Scholar
- FCC press release, FCC Adopts Rules for Unlicensed Use of Television White Spaces. November 2008.Google Scholar
- Mitigating the Effects of Unlicensed Devices on Wireless Microphones, Ahren Hartman and Edgar Reihl SHURE Incorporated, SHURE Incorporated. 2009.Google Scholar
- FCC press release, FCC Frees Up Vacant TV Airwaves For "Super Wi-Fi" Technologies and Other Technologies. September 2010.Google Scholar
- P. Bahl, R. Chandra, T. Moscibroda, R. Murty, and M. Welsh. White Space Networking with Wi-Fi like Connectivity. In SIGCOMM, 2009. Google ScholarDigital Library
- R. E. D. Borth and B. Oberlie. Considerations for Successful Cognitive Radio Systems in US TV White Space. In DySpan, 2008.Google ScholarCross Ref
- G. Buchwald, S. Kuffner, M. Brown, and E. C. L. Ecklund. The Design and Operation of the IEEE 802.22.1 Disabling Beacon for the Protection of TV Whitespace Incumbents. In DySpan, 2008.Google ScholarCross Ref
- R.-R. Chen and X. Liu. Coexisting with csma-based reactive primary users. In the proceedings of DySpan 2010.Google ScholarCross Ref
- D. Halperin et al. Predictable 802.11 packet delivery from wireless channel measurements. In SIGCOMM 2010. Google ScholarDigital Library
- G. Judd, X. Wang, and P. Steenkiste. Efficient Channel-aware Rate Adaptation in Dynamic Environments. In MobiSys, 2008. Google ScholarDigital Library
- K. Leentvaar and J. Flint. The capture effect in fm receivers. In IEEE Transactions on Communications, 1976.Google ScholarCross Ref
- S. Mishra, R. Brodersen, S. Brink, and R. Mahadevappa. Detect and avoid: an ultra-wideband/wimax coexistence mechanism. Communications Magazine, IEEE, 45(6):68--75, 2007. Google ScholarDigital Library
- S. Mishra, R. Tandra, and A. Sahai. Coexistence with primary users of different scales. In DySPAN 2007, pages 158--167, 2007.Google ScholarDigital Library
- S. Narlanka, R. Chandra, P. Bahl, and I. Ferrell. A Hardware Platform for Utilizing the TV Bands with a Wi-Fi Radio. In IEEE LANMAN, June 2007.Google ScholarCross Ref
- G. Nychis, T. Hottelier, Z. Yang, S. Seshan, and P. Steenkiste. Enabling mac protocol implementations on software-defined radios. In the proceedings of NSDI, 2009. Google ScholarDigital Library
- J. Poston and W. Horne. Discontiguous ofdm considerations for dynamic spectrum access in idle tv channels. In DySPAN, 2005.Google ScholarCross Ref
- H. Rahul et al. Learning to share: Narrowband-friendly wideband networks. In SIGCOMM 2008. Google ScholarDigital Library
- A. W. Rix, J. G. Beerends, M. P. Hollier, and A. P. Hekstra. Perceptual Evaluation of Speech Quality (PESQ)-A New Method for Speech Quality Assessment of Telephone Networks and Codecs. In IEEE Conf. on Acoustics, Speech, and Signal Processing, 2001. Google ScholarDigital Library
- L. Yang et al. Supporting demanding wireless applications with frequency-agile radios. In Proc. of NSDI (2010). Google ScholarDigital Library
- W. Yu-chun et al. Protection of Wireless Microphones in IEEE 802.22 Cognitive Radio Network. In ICC Workshops, 2009.Google Scholar
- Reclaiming the white spaces: spectrum efficient coexistence with primary users
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