Abstract
A spread-spectrum receiver must generate a spreading sequence or frequency-hopping pattern that is synchronized with the received sequence or pattern; that is, the corresponding chips or dwell intervals must precisely or nearly coincide. Any misalignment causes the signal amplitude at the demodulator output to fall in accordance with the autocorrelation or partial autocorrelation function. Although the use of precision clocks in both the transmitter and the receiver limit the timing uncertainty in the receiver, clock drifts, range uncertainty, and the Doppler shift may cause synchronization problems. Code synchronization, which is either sequence or pattern synchronization, might be obtained from separately transmitted pilot or timing signals. It may be aided or enabled by feedback signals from the receiver to the transmitter. However, to reduce the cost in power and overhead, most spread-spectrum receivers achieve code synchronization by processing the received signal.
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References
J. G. Proakis and M. Salehi, Digital Communications, 5th ed. New York: McGraw-Hill, 2008.
R. L. Peterson, R. E. Ziemer, and D. E. Borth, Introduction to Spread Spectrum Communications. Upper Saddle River, NJ: Prentice Hall, 1995.
H. Meyr and G. Polzer, “Performance Analysis for General PN Spread-spectrum Acquisition Techniques,” IEEE Trans. Commun., vol. 31, pp. 1317–1319, Dec. 1983.
V. M. Jovanovic, “Analysis of Strategies for Serial-Search Spread-Spectrum Code Acquisition—Direct Approach,” IEEE Trans. Commun., vol. 36, pp. 1208–1220, Nov. 1988.
S.-M. Pan, D. E. Dodds, and S. Kumar, “Acquisition Time Distribution for Spread-Spectrum Receivers, IEEE J. Select. Areas Commun., vol. 8, pp. 800-808, June 1990.
A. Polydoros and C. L. Weber, “A Unified Approach to Serial-Search Spread Spectrum Code Acquisition,” IEEE Trans. Commun., vol. 32, pp. 542–560, May 1984.
W. Suwansantisuk and M. Z. Win, “Multipath Aided Rapid Acquisition: Optimal Search Strategies,” IEEE Trans. Inform. Theory, vol. 53, pp. 174-193, Jan. 2007.
S. Gezici, “Mean Acquisition Time Analysis of Fixed-Step Serial Search Algorithms,” IEEE Trans. Commun., vol. 8, pp. 1096–1101, March 2009.
K. Choi, K. Cheun, and T. Jung, “Adaptive PN Code Acquisition Using Instantaneous Power-Scaled Detection Threshold under Rayleigh Fading and Pulsed Gaussian Noise Jamming,” IEEE Trans. Commun., pp. 1232–1235, Aug. 2001.
A. Polydoros and C. L. Weber, “Analysis and Optimization of Correlative Code-Tracking Loops in Spread-Spectrum Systems,” IEEE Trans. Commun., vol. 33, pp. 30–43, Jan. 1985.
W. R. Braun, “PN Acquisition and Tracking Performance in DS/CDMA Systems with Symbol-Length Spreading Sequence,” IEEE Trans. Commun., vol. 45, pp. 1595–1601, Dec. 1997.
J.-C. Lin, “A Modified PN Code Tracking Loop for Direct-Sequence Spread-Spectrum Communication Over Arbitrarily Correlated Multipath Fading Channels,” IEEE Trans. Selected Areas Commun., vol. 19, pp. 2381–2395, Dec. 2001.
L. E. Miller, J. S. Lee, R. H. French, and D. J. Torrieri, “Analysis of an Anti-jam FH Acquisition Scheme,” IEEE Trans. Commun., vol. 40, pp. 160-170, Jan. 1992.
C. A. Putman, S. S. Rappaport, and D. L. Schilling, “Comparison of Strategies for Serial Acquisition of Frequency-Hopped Spread-Spectrum Signals,” IEE Proc., vol. 133, pt. F, pp. 129–137, April 1986.
C. A. Putman, S. S. Rappaport, and D. L. Schilling, “Tracking of Frequency-Hopped Spread-Spectrum Signals in Adverse Environments,” IEEE Trans. Commun., vol. 31, pp. 955–963, Aug. 1983.
D. Torrieri, Principles of Secure Communication Systems, 2nd ed. Boston: Artech House, 1992.
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Torrieri, D. (2011). Code Synchronization. In: Principles of Spread-Spectrum Communication Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9595-7_4
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DOI: https://doi.org/10.1007/978-1-4419-9595-7_4
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