Influence of a real radio channel parameters on the quality of the OFDM signal in mobile applications. Estimation of parameters of the channel as an element of improvement of the transmission quality

• Autorzy: Bożek K.
• Języki publikacji: EN

Abstrakty

EN

The article deals with issues related to transmission of a signal with the OFDM multitude modulation in a real radio channel. Following short characteristics of the OFDM modulation, the article includes an analysis of typical radio channels from the angle of amplitude and phase on the basis of delay profiles referred to in the literature. The study contains results of simulated receipt of the OFDM signal in the multi-path conditions. On the basis of diagrams of constellation of the modulation symbols, the author presented differences in the quality of the signal before and after the phase correction and improvement in the quality due to application of cyclic prefix. Influence of noise as well as the fact that the terminals are non-stationary on operation of the frequency characteristics estimation algorithm was analyzed. At the end, an example was presented of application of a linear model of estimation of phase characteristics of a channel with the shift in frequency occurring in mobile systems as a consequence of the Doppler effect being compensated.

Słowa kluczowe

EN

OFDM; radio transmission; multi-path; radio channel estimation

• Wydawca: Łukasiewicz Industrial Research Institute for Automation and Measurements PIAP
• Czasopismo: Journal of Automation Mobile Robotics and Intelligent Systems
• Rocznik: 2007
• Tom: Vol. 1, No. 3
• Strony: 64--68
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Bożek K.

• Industrial Research Institute for Automation and Measurements PIAP, Intelligent Mobile Systems Division, Al. Jerozolimskie 202, 02-486 Warsaw, Poland

Bibliografia

• [1] S. Haykin, Systemy telekomunikacyjne [Communication systems], translated by B. Galiński, G. Hahn, WKŁ Publishing House, Warszawa,1998.
• [2] K. Wesołowski, Systemy radiokomunikacji ruchomej[Mobile radio communication systems], WKŁ Publishing House, Warszawa,1998.
• [3] J. Heiskala, J. Terry, OFDM Wireless LANs: A Theoretical and Practical Guide, SAMS, Indianapolis, USA, 2001.
• [4] H. Schulze, Ch. Lüders, Theory and Applications of OFDM and CDMA, John Wiley & Sons Ltd, West Sussex, England, 2005.
• [5] M. Engels, Wireless OFDM Systems, Norwell, USA, Kluwer Academic Publishers 2002.
• [6] L. Hanzo, C.H. Wong, M.S. Yee, Adaptive Wireless Transceivers, John Wiley & Sons Ltd , West Sussex, England, 2002.
• [7] A. R. S. Bahai, B. R. Saltzberg,Multi-Carrier Digital Communications , Kluwer Academic Publishers, New York, USA, 2002.
• [8] R.van Nee, R. Prasad, OFDM for Wireless Multimedia Communications, Artech House Publishers, Boston-London, 2000.