Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift

Wu Tuan-feng; Zhu Ai-min

Volume 27 Issue 6

Jun. 2005

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Article Navigation > Journal of Electronics & Information Technology > 2005 > 27(6): 861-864

Wu Tuan-feng, Zhu Ai-min. Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift[J]. Journal of Electronics & Information Technology, 2005, 27(6): 861-864.

Citation:

Wu Tuan-feng, Zhu Ai-min. Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift[J]. Journal of Electronics & Information Technology, 2005, 27(6): 861-864.

Wu Tuan-feng, Zhu Ai-min. Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift[J]. Journal of Electronics & Information Technology, 2005, 27(6): 861-864.

Citation:

Wu Tuan-feng, Zhu Ai-min. Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift[J]. Journal of Electronics & Information Technology, 2005, 27(6): 861-864.

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Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift

Received Date: 2004-01-06
Rev Recd Date: 2004-08-16
Publish Date: 2005-06-19

Abstract

Abstract

The influence of Doppler shifts on traditional acquisition algorithms is analyzed. A new method for spread-spectrum code acquisition of pilot symbols in the presence of large Doppler shifts is proposed, in which the outputs of partial matched filters are delivered to an Adaptive Line Enhancer (ALE) directly and an estimated frequency is produced. After frequency offset compensation, spread-spectrum code acquisition is performed by traditional spread-spectrum code acquisition algorithm. Simulation results show that the new method eliminates the influence of large Doppler shifts effectively, with fast acquisition time.

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References(1)

References

Povey G J R, Talvitie J. Doppler compensation and code acquisition techniques for LEO satellite mobile radio communications. IEE Fifth International conference on Satellite systems for Mobile Communications and Navigation, London,13-15th May, 1996:16 - 19.[2]Iinatti J, Pouttu A. Differentially coherent code acquisition in Doppler. IEEE Vehicular Technology Conference, Amsterdam,1999, 10:703 - 706.[3]Grant P M, Spangerberg S M, Scott I, et al. Doppler estimation for fast acquisition in spread spectrum communication systems.Proc. IEEE ISSSTA, Sun City, 1998(1): 542 - 560.[4]Kay S M, Marple S L. Spectrum analysis-a modern perspective[J].Proc. IEEE.1981, 69(11):1380-[5]Aboulnasr T, Mayyas K. A robust variable step-size LMS-type algorithm: analysis and simulation[J].IEEE Trans. on Signal Processing.1997, 45(3):631-

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