Weitere Artikel dieser Ausgabe durch Wischen aufrufen
The wireless transmission environment in vehicular ad hoc systems varies from line of sight with few surroundings to rich Rayleigh fading. An efficient communication system must adapt itself to these diverse conditions. Multiple antenna systems are known to provide superior performance compared to single antenna systems in terms of capacity and reliability. The correlation between the antennas has a great effect on the performance of MIMO systems. In this paper we introduce a novel adaptive channel model for MIMO-VBLAST systems in vehicular ad hoc networks. Using the proposed model, the correlation between the antennas was investigated. Although the line of sight is ideal for single antenna systems, it severely degrades the performance of VBLAST systems since it increases the correlation between the antennas. A channel update algorithm using single tap Kalman filters for VBLAST in flat fading channels has also been derived and evaluated. At 12 dB , the new algorithm showed 50% reduction in the mean square error (MSE) between the actual channel and the corresponding updated estimate compared to the MSE without update. The computational requirement of the proposed algorithm for a VBLAST is 6 real multiplications and 4 real additions.
Haykin S, Moher M: Modern Wireless Communications. Prentice-Hall, Upper Saddle River, NJ, USA; 2005.
Liberti JC, Rappaport TS: A geometrically based model for line-of-sight multipath radio channels. Proceedings of the 46th IEEE Vehicular Technology Conference (VTC '96), April-May 1996, Atlanta, Ga, USA 2: 844-848. CrossRef
Jakes WC: Microwave Mobile Communications. IEEE Press, Piscataway, NJ, USA; 1994. CrossRef
Parsons JD: The Mobile Radio Propagation Channel. John Wiley & Sons, New York, NY, USA; 2001.
Lee WCY: Mobile Communications Engineering. McGraw-Hill, New York, NY, USA; 1982.
Ertel RB, Cardieri P, Sowerby KW, Rappaport TS, Reed JH: Overview of spatial channel models for antenna array communication systems. IEEE Personal Communications 1998, 5(1):10-22. 10.1109/98.656151 CrossRef
Patel CS, Stüber GL, Pratt TG: Simulation of Rayleigh-faded mobile-to-mobile communication channels. IEEE Transactions on Communications 2005, 53(11):1876-1884. 10.1109/TCOMM.2005.858678 CrossRef
Zajić AG, Stüber GL: A three-dimensional MIMO mobile-to-mobile channel model. Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC '07), March 2007, Hong Kong 1885-1889.
Matolak DW, Sen I, Xiong W, Yaskoff NT: 5 GHZ wireless channel characterization for vehicle to vehicle communications. Proceedings of IEEE Military Communications Conference (MILCOM '05), October 2005, Atlatnic City, NJ, USA 5: 3022-3016.
Paier A, Karedal J, Czink N, et al.: Car-to-car radio channel measurements at 5 GHz: pathloss, power-delay profile, and delay-Doppler spectrum. Proceedings of 4th IEEE Internatilonal Symposium on Wireless Communication Systems (ISWCS '07), October 2007, Trondheim, Norway 224-228.
Cheng L, Henty BE, Stancil DD, Bai F, Mudalige P: Mobile vehicle-to-vehicle narrow-band channel measurement and characterization of the 5.9 GHz dedicated short range communication (DSRC) frequency band. IEEE Journal on Selected Areas in Communications 2007, 25(8):1501-1516. CrossRef
Polydoros A, Dessouky K, Pereira JMN, et al.: Vehicle to roadside communications study. In Research Reports. California Partners for Advanced Transit and Highways (PATH), University of California, Berkeley, Calif, USA; June 1993.
Ulaby FT: Fundamentals of Applied Electromagnetics. Prentice-Hall, Upper Saddle River, NJ, USA; 1999.
Gill TP: The Doppler Effect. Logos Press, New York, NY, USA; 1965.
IEEE Draft P802.11p/D2.0, November 2006
American Society for Testing and Materials (ASTM), http://www.astm.org/
Maurer J, Fügen T, Wiesbeck W: Narrow-band measurement and analysis of the inter-vehicle transmission channel at 5.2 GHz. Proceedings of the 55th IEEE Vehicular Technology Conference (VTC '02), May 2002, Birmingham, Ala, USA 3: 1274-1278.
Cheng L, Henty BE, Stancil DD, Bai F: Doppler component analysis of the suburban vehicle-to-vehicle DSRC propagation channel at 5.9 GHz. Proceedings of the IEEE Radio and Wireless Symposium (RWS '08), January 2008, Orlando, Fla, USA 343-346.
Chizhik D, Rashid-Farrokhi F, Ling J, Lozano A: Effect of antenna separation on the capacity of BLAST in correlated channels. IEEE Communications Letters 2000, 4(11):337-339. 10.1109/4234.892194 CrossRef
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. 10.1109/7693.994830 CrossRef
Biguesh M, Gershman AB: Training-based MIMO channel estimation: a study of estimator tradeoffs and optimal training signals. IEEE Transactions on Signal Processing 2006, 54(3):884-893. CrossRef
Minn H, Al-Dhahir N: Optimal training signals for MIMO OFDM channel estimation. IEEE Transactions on Wireless Communications 2006, 5(5):1158-1168. CrossRef
Park B, Wong TF: Optimal training sequence in MIMO systems with multiple interference sources. Proceedings of the IEEE Global Telecommunications Conference (GLOBECOM '04), November-December 2004, Dallas, Tex, USA 1: 86-90. CrossRef
Karami E, Shiva M: Maximum likelihood MIMO channel tracking. Proceedings of the 59th IEEE Vehicular Technology Conference (VTC '04), May 2004, Milan, Italy 2: 876-879.
Yanfei G, Zishu H: MIMO channel tracking based on Kalman filter and MMSE-DFE. Proceedings of the International Conference on Communications, Circuits and Systems (ICCCAS '05), May 2005, Hong Kong 1: 223-226.
Li L, Li H, Yu H, Yang B, Hu H: A new algorithm for MIMO channel tracking based on Kalman filter. Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC '07), March 2007, Hong Kong 164-168.
Gore D, Heath RW Jr., Paulraj A: On performance of the zero forcing receiver in presence of transmit correlation. Proceedings of IEEE International Symposium on Information Theory (ISIT '02), June-July 2002, Lausanne, Switzerland 159. CrossRef
Meyr H, Moeneclaey M, Fechtel SA: Digital Communication Receivers. John Wiley & Sons, New York, NY, USA; 1998.
Wang T, Proakis JG, Masry E, Zeidler JR: Performance degradation of OFDM systems due to doppler spreading. IEEE Transactions on Wireless Communications 2006, 5(6):1422-1432. CrossRef
- An Adaptive Channel Model for VBLAST in Vehicular Networks
Ghassan M. T. Abdalla
Mosa A. Abu-Rgheff
- Springer International Publishing
EURASIP Journal on Wireless Communications and Networking
Elektronische ISSN: 1687-1499
Neuer Inhalt/© ITandMEDIA, Best Practices für die Mitarbeiter-Partizipation in der Produktentwicklung/© astrosystem | stock.adobe.com