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Analysis of Filter-Bank-Based Methods for Fast Serial Acquisition of BOC-Modulated Signals


Binary-offset-carrier (BOC) signals, selected for Galileo and modernized GPS systems, pose significant challenges for the code acquisition, due to the ambiguities (deep fades) which are present in the envelope of the correlation function (CF). This is different from the BPSK-modulated CDMA signals, where the main correlation lobe spans over 2-chip interval, without any ambiguities or deep fades. To deal with the ambiguities due to BOC modulation, one solution is to use lower steps of scanning the code phases (i.e., lower than the traditional step of 0.5 chips used for BPSK-modulated CDMA signals). Lowering the time-bin steps entails an increase in the number of timing hypotheses, and, thus, in the acquisition times. An alternative solution is to transform the ambiguous CF into an "unambiguous" CF, via adequate filtering of the signal. A generalized class of frequency-based unambiguous acquisition methods is proposed here, namely the filter-bank-based (FBB) approaches. The detailed theoretical analysis of FBB methods is given for serial-search single-dwell acquisition in single path static channels and a comparison is made with other ambiguous and unambiguous BOC acquisition methods existing in the literature.



  1. 1.

    Betz JW: The offset carrier modulation for GPS modernization. Proceedings of the International Technical Meeting of the Institute of Navigation (ION-NTM '99), January 1999, San Diego, Calif, USA 639-648.

    Google Scholar 

  2. 2.

    Burian A, Lohan ES, Renfors M: BPSK-like methods for hybrid-search acquisition of Galileo signals. Proceedings of the IEEE International Conference on Communications (ICC '06), June 2006, Istanbul, Turkey 11: 5211-5216.

    Google Scholar 

  3. 3.

    Lohan ES, Lakhzouri A, Renfors M: Binary-offset-carrier modulation techniques with applications in satellite navigation systems. Wireless Communications and Mobile Computing 2006,7(6):767-779.

    Article  Google Scholar 

  4. 4.

    Lohan ES, Lakhzouri A, Renfors M: Spectral shaping of Galileo signals in the presence of frequency offsets and multipath channels. Proceedings of 14th IST Mobile & Wireless Communications Summit, June 2005, Dresden, Germany CDRO

    Google Scholar 

  5. 5.

    Fischer S, Guérin A, Berberich S: Acquisition concepts for Galileo BOC(2,2) signals in consideration of hardware limitations. Proceedings of the 59th IEEE Vehicular Technology Conference (VTC '04), May 2004, Milan, Italy 5: 2852-2856.

    Google Scholar 

  6. 6.

    Martin N, Leblond , Guillotel G, Heiries V: BOC(x,y) signal acquisition techniques and performances. Proceedings of the 16th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GPS/GNSS '03), September 2003, Portland, Ore, USA 188-198.

    Google Scholar 

  7. 7.

    Bandemer B, Denks H, Hornbostel A, Konovaltsev A, Coutinho PR: Performance of acquisition methods for Galileo SW receivers. Proceedings of the European Navigation Conference (ENC-GNSS '05), July 2005, Munich, Germany CDRO

    Google Scholar 

  8. 8.

    Barker BC, Betz JW, Clark JE, et al.: Overview of the GPS M code signal. Proceedings of the International Technical Meeting of the Institute of Navigation (ION-NTM '00), January 2000, Anaheim, Calif, USA CDRO

    Google Scholar 

  9. 9.

    Fishman P, Betz JW: Predicting performance of direct acquisition for the M-code signal. Proceedings of the International Technical Meeting of the Institute of Navigation (ION-NTM '00), January 2000, Anaheim, Calif, USA 574-582.

    Google Scholar 

  10. 10.

    Heiries V, Roviras D, Ries L, Calmettes V: Analysis of non ambiguous BOC signal acquisition performance. Proceedings of the 18th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION-GNSS '05), September 2005, Long Beach, Calif, USA CDRO

    Google Scholar 

  11. 11.

    Lohan ES: Statistical analysis of BPSK-like techniques for the acquisition of Galileo signals. Proceedings of the 23rd AIAA International Communication Systems Conference (ICSSC '05), September 2005, Rome, Italy CDRO

    Google Scholar 

  12. 12.

    Lohan ES: Filter-bank based technique for fast acquisition of Galileo and GPS signals. Proceedings of the 17th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '06), September 2006, Helsinki, Finland 1-5.

    Google Scholar 

  13. 13.

    Kaplan ED: Understanding GPS: Principles and Applications. Artech House, London, UK; 1996.

    Google Scholar 

  14. 14.

    Ward PW: GPS receiver search techniques. Proceedings of the IEEE Position Location and Navigation Symposium, April 1996, Atlanta, Ga, USA 604-611.

    Google Scholar 

  15. 15.

    Katz M: Code acquisition in advanced CDMA networks, Ph.D. thesis. University of Oulu, Oulu, Finland; 2002.

    Google Scholar 

  16. 16.

    Betz J, Capozza P: System for direct acquisition of received signals. 2004. US patent no. 2004/0071200 A

    Google Scholar 

  17. 17.

    Proakis J: Digital Communications. 4th edition. McGraw-Hill, New York, NY, USA; 2001.

    Google Scholar 

  18. 18.

    Rick RR, Milstein LB: Optimal decision strategies for acquisition of spread-spectrum signals in frequency-selective fading channels. IEEE Transactions on Communications 1998,46(5):686-694. 10.1109/26.668744

    Article  Google Scholar 

  19. 19.

    Bastide F, Julien O, Macabiau C, Roturier B: Analysis of L5/E5 acquisition, tracking and data demodulation thresholds. Proceedings of the International Technical Meeting of the Satellite Division of the Institute of Navigation (ION-GPS '02), September 2002, Portland, Ore, USA 2196-2207.

    Google Scholar 

  20. 20.

    Raghavan SH, Holmes JK: Modeling and simulation of mixed modulation formats for improved CDMA bandwidth efficiency. Proceedings of the 60th IEEE Vehicular Technology Conference (VTC '04), September 2004, Los Angeles, Calif, USA 6: 4290-4295.

    Google Scholar 

  21. 21.

    Holmes J, Chen C: Acquisition time performance of PN spread-spectrum systems. IEEE Transactions on Communications 1977,25(8):778-784. 10.1109/TCOM.1977.1093913

    Article  MATH  Google Scholar 

  22. 22.

    Povey GJR: Spread spectrum PN code acquisition using hybrid correlator architectures. Wireless Personal Communications 1998,8(2):151-164. 10.1023/A:1008855326327

    Article  Google Scholar 

  23. 23.

    Zhuang W: Noncoherent hybrid parallel PN code acquisition for CDMA mobile communications. IEEE Transactions on Vehicular Technology 1996,45(4):643-656. 10.1109/25.543720

    Article  Google Scholar 

  24. 24.

    Homier EA, Scholtz RA: Hybrid fixed-dwell-time search techniques for rapid acquisition of ultra-wideband signals. Proceedings of the International Workshop on Ultra-Wideband Systems, June 2003, Oulu, Finland

    Google Scholar 

  25. 25.

    Kang B-J, Lee I-K: A performance comparison of code acquisition techniques in DS-CDMA system. Wireless Personal Communications 2003,25(2):163-176. 10.1023/A:1023619426148

    Article  Google Scholar 

  26. 26.

    Shin O-S, Lee KB: Utilization of multipaths for spread-spectrum code acquisition in frequency-selective Rayleigh fading channels. IEEE Transactions on Communications 2001,49(4):734-743. 10.1109/26.917779

    MathSciNet  Article  MATH  Google Scholar 

  27. 27.

    DiCarlo D, Weber C: Multiple dwell serial search: performance and application to direct sequence code acquisition. IEEE Transactions on Communications 1983,31(5):650-659. 10.1109/TCOM.1983.1095867

    Article  MATH  Google Scholar 

  28. 28.

    Soliman S, Glazko S, Agashe P: GPS receiver sensitivity enhancement in wireless applications. Proceedings of the IEEE MTT-S International Tipical Symposium on Technologies for Wireless Applications, February 1999, Vancouver, Canada 181-186.

    Google Scholar 

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Correspondence to ElenaSimona Lohan.

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Lohan, E. Analysis of Filter-Bank-Based Methods for Fast Serial Acquisition of BOC-Modulated Signals. J Wireless Com Network 2007, 025178 (2007).

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  • Correlation Function
  • Acquisition Time
  • Static Channel
  • Alternative Solution
  • Single Path