Open Access

A MIMO-OFDM Testbed for Wireless Local Area Networks

  • Albert Guilléni Fàbregas1Email author,
  • Maxime Guillaud2,
  • Dirk TM Slock2,
  • Giuseppe Caire3,
  • Karine Gosse4,
  • Stéphanie Rouquette4,
  • Alexandre Ribeiro Dias4,
  • Philippe Bernardin4,
  • Xavier Miet4,
  • Jean-Marc Conrat5,
  • Yann Toutain6,
  • Alain Peden7 and
  • Zaiqing Li7
EURASIP Journal on Advances in Signal Processing20062006:018083

DOI: 10.1155/ASP/2006/18083

Received: 15 December 2004

Accepted: 21 June 2005

Published: 21 March 2006

Abstract

We describe the design steps and final implementation of a MIMO OFDM prototype platform developed to enhance the performance of wireless LAN standards such as HiperLAN/2 and 802.11, using multiple transmit and multiple receive antennas. We first describe the channel measurement campaign used to characterize the indoor operational propagation environment, and analyze the influence of the channel on code design through a ray-tracing channel simulator. We also comment on some antenna and RF issues which are of importance for the final realization of the testbed. Multiple coding, decoding, and channel estimation strategies are discussed and their respective performance-complexity trade-offs are evaluated over the realistic channel obtained from the propagation studies. Finally, we present the design methodology, including cross-validation of the Matlab, C++, and VHDL components, and the final demonstrator architecture. We highlight the increased measured performance of the MIMO testbed over the single-antenna system.

[1234567891011121314151617181920212223242526]

Authors’ Affiliations

(1)
Institute for Telecommunications Research, University of South Australia, SPRI Building, Mawson Lakes Boulevard
(2)
Eurécom Institute
(3)
Electrical Engineering Department, University of Southern California
(4)
Motorola Labs, Centre de Recherche de Motorola, Espace Technologique Saint-Aubin
(5)
France Telecom R&D
(6)
Antennessa
(7)
École Nationale Supérieure des Télécommunications de Bretagne, Technopôle Brest-Iroise

References

  1. Emre Telatar I: Capacity of multi-antenna Gaussian channels. European Transactions on Telecommunications 1999, 10(6):585-595. 10.1002/ett.4460100604View ArticleGoogle Scholar
  2. Foschini GJ, Gans MJ: On limits of wireless communications in a fading environment when using multiple antennas. Wireless Personal Communications 1998, 6(3):311-335. 10.1023/A:1008889222784View ArticleGoogle Scholar
  3. Laspougeas P, Conrat J-M, Mayrargue S, Pajusco P: Single and dual multi-sensor channel characterisation in Indoor and Campus environments at 5 GHz. Proceedings of IST Mobile Communications Summit, September 2001, Barcelona, SpainGoogle Scholar
  4. ETSI Normalization Committee : Channel models for HIPERLAN/2 in different indoor scenarios. Norm ETSI doc. 3ERI085B, European Telecommunications Standards Institute, Sophia-Antipolis, France, 1998
  5. Laspougeas P, Pajusco P, Bic J-C: Spatial radio channel model for UMTS in urban small cells area. Proceedings of European Conference on Wireless Technology (ECWT '00), October 2000, Paris, France 118-121.Google Scholar
  6. Laspougeas P, Pajusco P, Bic J-C: Radio propagation in urban small cells environment at 2 GHz: experimental spatio-temporal characterization and spatial wideband channel model. Proceedings of 52nd IEEE Vehicular Technology Conference (VTC '00), September 2000, Boston, Mass, USA 2: 885-892.Google Scholar
  7. Conrat J-M, Pajusco P: A versatile propagation channel simulator for MIMO link level simulation. COST 273 Project Report TD(03)120 2003.Google Scholar
  8. Erceg V, Schumacher L, Kyritsi P, et al.: IEEE P802.11 Wireless LANs: TGn Channel Models. IEEE 802.11 document 03/940r1, 2003Google Scholar
  9. Chaigneaud L, Guillet V, Vauzelle R: A 3D ray-tracing tool for broadband wireless systems. Proceedings of IEEE VTS 54th Vehicular Technology Conference (VTC '01), October 2001, Atlantic City, NJ, USA 4: 2043-2047.Google Scholar
  10. Bölcskei H, Borgmann M, Paulraj AJ: Impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM. IEEE Journal on Selected Areas in Communications 2003, 21(3):427-439. Special issue on MIMO systems and applications 10.1109/JSAC.2003.809723View ArticleGoogle Scholar
  11. Gesbert D, Bölcskei H, Gore D, Paulraj AJ: MIMO wireless channels: capacity and performance prediction. Proceedings of IEEE Global Telecommunications Conference (GLOBECOM '00), November–December 2000, San Francisco, Calif, USA 2: 1083-1088.Google Scholar
  12. Chizhik D, Foschini GJ, Gans MJ, Valenzuela RA: Keyholes, correlations, and capacities of multielement transmit and receive antennas. IEEE Transactions on Wireless Communications 2002, 1(2):361-368. 10.1109/7693.994830View ArticleGoogle Scholar
  13. Visuri S, Slock DTM: Colocated antenna arrays: design desiderata for wireless communications. Proceedings of 2nd IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM '02), August 2002, Rosslyn, Va, USA 580-584.Google Scholar
  14. Alamouti SM: A simple transmit diversity technique for wireless communications. IEEE Journal on Selected Areas in Communications 1998, 16(8):1451-1458. 10.1109/49.730453View ArticleGoogle Scholar
  15. Tirkkonen O, Boariu A, Hottinen A: Minimal non-orthogonality rate 1 space-time block code for 3+ Tx antennas. Proceedings of IEEE 6th International Symposium on Spread Spectrum Techniques and Applications, September 2000, Parsippany, NJ, USA 2: 429-432.Google Scholar
  16. Wolniansky PW, Foschini GJ, Golden GD, Valenzuela RA: V-BLAST: an architecture for realizing very high data rates over the rich-scattering wireless channel. Proceedings of URSI International Symposium on Signals, Systems, and Electronics (ISSSE '98), September–October 1998, Pisa, Italy 295-300.Google Scholar
  17. Guillaud M, Slock DTM: Full-rate full-diversity space-frequency coding for MIMO OFDM systems. Proceedings of 3rd IEEE Benelux Signal Processing Symposium (SPS '02), March 2002, Leuven, BelgiumGoogle Scholar
  18. Guillaud M, Slock DTM: Multi-stream coding for MIMO OFDM systems with space-time-frequency spreading. Proceedings of 5th International Symposium on Wireless Personal Multimedia Communications (WPMC '02), October 2002, Honolulu, Hawaii, USA 1: 120-124.View ArticleGoogle Scholar
  19. Boutros J, Gresset N, Brunel L: Turbo coding & decoding for multiple-antenna channels. Proceedings of 3rd International Symposium on Turbo Codes and Related Topics, September 2003, Brest, France 185-186.Google Scholar
  20. Guillén i Fàbregas A, Caire G: Impact of signal constellation expansion on the achievable diversity in quasistatic multiple-antenna channels. Proceedings of 12th European Signal Processing Conference (EUSIPCO '04), September 2004, Vienna, AustriaGoogle Scholar
  21. Guillén i Fàbregas A, Caire G: Design of space-time BICM codes for block fading channels with iterative decoding. In Proceedings of 37th Conference on Information Sciences and Systems (CISS '03), March 2003, Baltimore, Md, USA. Johns Hopkins University Press;Google Scholar
  22. Biglieri E, Caire G, Taricco G: Limiting performance of block-fading channels with multiple antennas. IEEE Transactions on Information Theory 2001, 47(4):1273-1289. 10.1109/18.923715MathSciNetView ArticleMATHGoogle Scholar
  23. Knopp R, Caire G: Power control and beamforming for systems with multiple transmit and receive antennas. IEEE Transactions on Wireless Communications 2002, 1(4):638-648. 10.1109/TWC.2002.804158View ArticleGoogle Scholar
  24. Tarokh V, Jafarkhani H, Calderbank AR: Space-time block codes from orthogonal designs. IEEE Transactions on Information Theory 1999, 45(5):1456-1467. 10.1109/18.771146MathSciNetView ArticleMATHGoogle Scholar
  25. Dias AR, Rouquette S, Gosse K: MTMR channel estimation and pilot design in the context of space-time block coded OFDM-based WLANs. Proceedings of IST Mobile and Wireless Telecommunications Summit, June 2002, Thessaloniki, Greece 73-77.Google Scholar
  26. Slock DTM: Signal processing challenges for wireless communications. Proceedings of 1st International Symposium on Control, Communications and Signal Processing (ISCCSP '02), March 2004, Hammamet, Tunisia 881-892.Google Scholar

Copyright

© Albert Guillén i Fàbregas et al. 2006

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Advertisement