Design and deployment considerations for high performance MIMO testbeds

ABSTRACT

MIMO (Multiple Input Multiple Output) enabled systems are characterized by higher reliability and transmission rates, as compared to conventional SISO (Single Input Single Output) systems. However, unless administered properly, the MIMO technology may not facilitate very high throughputs on point-to-point wireless links. Therefore, it becomes imperative for the network architect to design such networks in ways that fully exploit the inherent properties of MIMO. In this paper, we first conduct an extensive experimental study, using a powerful hardware platform, in order to understand the behavior of MIMO links in different topological scenarios. Our experiments involve scenarios with MIMO links in isolation, as well as in competition with other MIMO and SISO links. Second, we perform measurements with different commercial platforms towards assessing the ability of each platform to efficiently support the MIMO technology. Based on our experimental observations we deduce that the CPU processing speed of the underlying hardware platform is an important factor that can hide the performance benefits of a MIMO enabled tranceiver. We comment on the applicability of the different hardware choices that we test; furthermore, we suggest the most appropriate choice for building a MIMO testbed, taking into account the cost, the extend-ability and the re-usability of the selected platform. Finally, having adopted this choice in our testbed design, we provide a description of our testbed architecture.

REFERENCES

• 1: H. Jafarkhani. Space-Time Coding: Theory and Practice. Cambridge University Press, 2005.
• 2: Paul Goud, Jr. , Robert Hang , Dmitri Truhachev , Christian Schlegel, A portable MIMO testbed and selected channel measurements, EURASIP Journal on Applied Signal Processing, 2006, p.141-141, 01 January [doi>10.1155/ASP/2006/51490]
• 3: C. Mehlfuhrer, S. Geirhofer, S. Caban, and M. Rupp. A Flexible MIMO Testbed wit Remote Access. In EURASIP Journal of Applied Signal Processing, 2005.
• 4: D. Kim and M. Torlak. Rapid prototyping of a cost effective and flexible 4x4 mimo testbed. In 5th IEEE Sensor Array and Multichannel Signal Processing Workshop, 2008.
• 5: MASCOT:Multiple-Access Space-Time Coding Testbed. http://www.ist-mascot.org/.
• 6: H. Van and Dyke Parunak. MASCOT: A Virtual Factory for Research and Development in Manufacturing Scheduling and Control. In 3rd Workshop on Intelligent Scheduling in Manufacturing, 1993.
• 7: S. M. Alamouti. A simple transmit diversity technique for wireless communications. In IEEE Journal on Selected Areas in Communications, October 1998.
• 8: J.-C. Belfiore, G. Rekaya, and E. Viterbo. The Golden Code: A 2 x 2 Full-Rate Space-Time Code with Non-Vanishing Determinants. In IEEE Transactions on Information Theory, April 2005.
• 9: WARP: Wireless Open Access Research Platform. http://warp.rice.edu/trac.
• 10: Joseph Camp , Edward Knightly, Modulation rate adaptation in urban and vehicular environments: cross-layer implementation and experimental evaluation, Proceedings of the 14th ACM international conference on Mobile computing and networking, September 14-19, 2008, San Francisco, California, USA [doi>10.1145/1409944.1409981]
• 11: GNU Radio - The GNU Software Radio. http://www.gnu.org/software/gnuradio/.
• 12: Ettus Research LLC. http://www.ettus.com/.
• 13: G. Daniels H. Suzuki, M. Hedley and J. Yuan. Performance of MIMO -OFDM-BICM on Measured Indoor Channels. In IEEE VTC, Spring 2006.
• 14: Ralink: MIMO technology. http://www.ralinktech.com.
• 15: ANSI/IEEE 802.11-Standard. 1999 edition.
• 16: UCR Wireless Testbed. http://networks.cs.ucr.edu/testbed.
• 17: RT2860 wireless driver. http://www.ralinktech.com/ralink/Home/Support/Linux.html.
• 18: Ioannis Broustis , Konstantina Papagiannaki , Srikanth V. Krishnamurthy , Michalis Faloutsos , Vivek Mhatre, MDG: measurement-driven guidelines for 802.11 WLAN design, Proceedings of the 13th annual ACM international conference on Mobile computing and networking, September 09-14, 2007, Montréal, Québec, Canada [doi>10.1145/1287853.1287884]
• 19: M. Heusse, F. Rousseau, G. Berger-Sabbatel, and A. Duda. Performance anomaly of 802.11b. In INFOCOM, 2003.
• 20: Bob O'Hara , Al Petrick, The IEEE 802.11 Handbook: A Designer's Companion, Standards Information Network IEEE Press, 1999
• 21: J. Yee and H. P-Esfahani. Understanding Wireless LAN Performance Tradeoffs. In http://www.commsdesign.com, 2002.
• 22: Soekris Engineering. http://www.soekris.com.
• 23: G. Jakllari, S. Eidenbenz, N. Hengartner, S. V. Krishnamurthy, and M. Faloutsos. Link Positions Matter: A Noncommutative Routing Metric for Wireless Mesh Networks. In IEEE INFOCOM, 2008.
• 24: ORBIT, WinLab. http://www.orbit-lab.org.

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.3 Network Operations

General Terms:
Design, Experimentation, Measurement, Performance

Keywords:
IEEE 802.11n, MIMO communications, testbed deployment, topology