Abstract
Recent studies show that high-power cross-technology interference is becoming a major problem in today's 802.11 networks. Devices like baby monitors and cordless phones can cause a wireless LAN to lose connectivity. The existing approach for dealing with such high-power interferers makes the 802.11 network switch to a different channel; yet the ISM band is becoming increasingly crowded with diverse technologies, and hence many 802.11 access points may not find an interference-free channel.
This paper presents TIMO, a MIMO design that enables 802.11n to communicate in the presence of high-power cross-technology interference. Unlike existing MIMO designs, however, which require all concurrent transmissions to belong to the same technology, TIMO can exploit MIMO capabilities to decode in the presence of a signal from a different technology, hence enabling diverse technologies to share the same frequency band. We implement a prototype of TIMO in GNURadio-USRP2 and show that it enables 802.11n to communicate in the presence of interference from baby monitors, cordless phones, and microwave ovens, transforming scenarios with a complete loss of connectivity to operational networks.
Supplemental Material
- 20 Myths of Wi-Fi Interference: Dispel Myths to Gain High-Performing and Reliable Wireless, White paper C11-44927.1-00, Cisco, December 2007.Google Scholar
- 2.4GHz 4-Channel Wireless Receiver and 4 Wireless Infrared Color Cameras, Genica. www.genica.com.Google Scholar
- AirMaestro Spectrum Analysis Solution, Bandspeed. www.bandspeed.com.Google Scholar
- ArrayComm. www.arraycomm.com.Google Scholar
- Bluetooth Basics, Bluetooth SIG Inc., 2011. www.bluetooth.com.Google Scholar
- Cisco CleanAir Technology, Cisco. www.cisco.com/en/US/netsol/ns1070/index.html.Google Scholar
- Estimating the Utilisation of Key License-Exempt Spectrum Bands, Final Report REP003, Mass Consultants Ltd., Ofcom, April 2009.Google Scholar
- Evaluating Interference in Wireless LANs: Recommended Practice, White paper FPG 2010-135.1, Farpoint Group Technical Note, April 2010.Google Scholar
- Fury GPS Disciplined Oscillator, Jackson Labs. www.jackson-labs.com.Google Scholar
- Miercom: Cisco CleanAir Competitive Testing, Lab Test Rerpot DR100409D, Miercom, April 2010.Google Scholar
- Motorola Airdefense Solutions, Motorola www.airdefense.net.Google Scholar
- Uniden TRU4465: Dual Handset Powermax 2.4GHz Cordless Systems, Uniden. www.uniden.com.Google Scholar
- Universal Software Radio Peripheral, Ettus Inc www.ettus.com.Google Scholar
- Wireless RF Interference Customer Survey Result, White paper C11-609300-00, Cisco, 2010.Google Scholar
- Local and metropolitan area networks--specific requirements part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications. IEEE Std 802.11, October 2009.Google Scholar
- E. Aryafar, N. Anand, T. Salonidis, and E. W. Knightly. Design and Experimental Evaluation of Multi-user Beamforming in Wireless LANs. In Proc. ACM MobiCom 2010, pages 197--208, Chicago, IL, 2010. Google ScholarDigital Library
- Bandspeed. Understanding the Effects of Radio Frequency (RF) Interference on WLAN performance and Security, 2010.Google Scholar
- L. Cao, L. Yang, and H. Zheng. The Impact of Frequency-Agility on Dynamic Spectrum Sharing. In Proc. IEEE DySPAN 2010, pages 1--12, Singapore, 2010.Google ScholarCross Ref
- R. Chandra, R. Mahajan, T. Moscibroda, R. Raghavendra, and P. Bahl. A Case for Adapting Channel Width in Wireless Networks. In Proc. ACM SIGCOMM 2008, pages 135--146, Seattle, WA, 2008. Google ScholarDigital Library
- S. Gollakota and D. Katabi. Zigzag Decoding: Combating Hidden Terminals in Wireless Networks. In Proc. ACM SIGCOMM 2008, pages 159--170, Seattle, WA, 2008. Google ScholarDigital Library
- S. Gollakota, S. D. Perli, and D. Katabi. Interferenc Alignment and Cancellation. In Proc. ACM SIGCOMM 2009, pages 159--170, Barcelona, Spain, 2009. Google ScholarDigital Library
- D. Halperin, J. Ammer, T. Anderson, and D. Wetherall Interference Cancellation: Better Receivers for a New Wireless MAC. In Proc. ACM HotNets 2007, Atlanta, GA, 2007.Google Scholar
- Y. He, J. Fang, J. Zhang, H. Shen, K. Tan, and Y. Zhang. MPAP: Virtualization Architecture for Heterogenous Wireless APs. In Proc. ACM SIGCOMM 2010, pages 475--476, New Delhi, India, 2010. Google ScholarDigital Library
- J. Heiskala and J. Terry. OFDM Wireless LANs: A Theoretical and Practical Guide. Sams Publishing, 2001. Google ScholarDigital Library
- K. Jamieson and H. Balakrishnan. PPR: Partial Packet Recover for Wireless Networks. In Proc. ACM SIGCOMM 2007, pages 409--420, Kyoto, Japan, 2007. Google ScholarDigital Library
- S. Katti, S. Gollakota, and D. Katabi. Embracing Wireless Interference:Analog Network Coding. In Proc. ACM SIGCOMM 2007, pages 397--408, Kyoto, Japan, 2007. Google ScholarDigital Library
- S. Katti, D. Katabi, H. Balakrishnan, and M. Medard. Symbo Level Network Coding for Wireless Mesh Networks. In Proc. ACM SIGCOMM 2008, pages 401--412, Seattle, WA, 2008. Google ScholarDigital Library
- J. Ketchum, S. Nanda, R. Walton, S. Howard, M. Wallace, B. Bjerke, I. Medvedev, S. Abraham, A. Meylan, and S. Surineni. System Description and Operating Principles for High Throughput Enhancements to 802.11, QUALCOMM Inc., April 2005.Google Scholar
- K. Lakshminarayanan, S. Sapra, S. Seshan, and P. Steenkiste. RFDump: An Architecture for Monitoring the Wireless Ether. In Proc. CoNEXT 2009, pages 253--264, Rome, Italy, 2009. Google ScholarDigital Library
- S. Mishra, R. Brodersen, S. Brink, and R. Mahadevappa. Detect and Avoid: An Ultra-Wideband/WiMAX Coexistence Mechanism. IEEE Communications Magazine, 45(6):68--75, June 2007. Google ScholarDigital Library
- T. Moscibroda, R. Chandra, Y. Wu, S. Sengupta, P. Bahl, and Y. Yuan. Load-Aware Spectrum Distribution in Wireless LANs. In Proc. IEEE ICNP 2008, pages 137--146, Orlando, FL, 2008.Google ScholarDigital Library
- H. Rahul, N. Kushman, D. Katabi, C. Sodini, and F. Edalat Learning to Share: Narrowband-Friendly Wideband Networks. In Proc. ACM SIGCOMM 2008, pages 147--158, Seattle, WA, 2008. Google ScholarDigital Library
- SourceForge. iperf.sourceforge.net.Google Scholar
- T. Taher, M. Misurac, J. LoCicero, and D. Ucci. Microwave Oven Signal Modelling. In Proc. IEEE WCNC 2008, pages 1235--1238, Las Vegas, NV, 2008.Google ScholarCross Ref
- K. Tan, H. Liu, J. Fang, W. Wang, J. Zhang, M. Chen, and G. M. Voelker. SAM: Enabling Practical Spatial Multiple Access in Wireless LAN. In Proc. ACM MobiCom 2009, pages 49--60, Beijing, China, 2009. Google ScholarDigital Library
- D. Tse and P. Vishwanath. Fundamentals of Wireles Communications. Cambridge University Press, May 2005. Google ScholarDigital Library
- M. Vutukuru, H. Balakrishnan, and K. Jamieson. Cross-Laye Wireless Bit Rate Adaptation. In Proc. ACM SIGCOMM 2009, pages 3--14, Barcelona, Spain, 2009. Google ScholarDigital Library
- L. Yang, W. Hou, L. Cao, B. Y. Zhao, and H. Zheng. Supporting Demanding Wireless Applications with Frequency-Agile Radios. In Proc. USENIX NSDI 2010, pages 5--5, San Jose, CA, 2010. Google ScholarDigital Library
- P. Zetterberg. Experimental Investigation of TDD Reciprocit Based Zero-Forcing Transmit Precoding. EURASIP J. Adv. Signal Process, 2011:5:1-5:10, January 2011. Google ScholarDigital Library
- H. Zhao, Y. Q. Shi, and N. Ansari. Hiding Data in Multimedia Streaming over Networks. In Proc. CNSR 2010, pages 50--55, Montreal, QC, 2010. Google ScholarDigital Library
Index Terms
- Clearing the RF smog: making 802.11n robust to cross-technology interference
Recommendations
Clearing the RF smog: making 802.11n robust to cross-technology interference
SIGCOMM '11: Proceedings of the ACM SIGCOMM 2011 conferenceRecent studies show that high-power cross-technology interference is becoming a major problem in today's 802.11 networks. Devices like baby monitors and cordless phones can cause a wireless LAN to lose connectivity. The existing approach for dealing ...
A two-stage game theoretical approach for interference mitigation in Body-to-Body Networks
In this paper, we identify and exploit opportunities for cooperation between a group of mobile Wireless Body Area Networks (WBANs), forming a Body-to-Body Network (BBN), through inter-body interference detection and subsequent mitigation. Thus, we ...
The RF-chain limited MIMO system: part I: optimum diversity-multiplexing tradeoff
The large gain promised by the multi-input multi-output (MIMO) technology comes with a cost. In particular, multiple analog radio frequency (RF) chains, which are expensive and power consuming, are required at both the transmitter and receiver sides. On ...
Comments