A LOW COMPLEXITY DS/CDMA ACQUISITION TECHNIQUE FOR LARGE FREQUENCY OFFSETS

This paper discusses a code acquisition technique, for use in spread-spectrum communication system with large frequency offsets, where the frequency offset is similar to the symbol rate. This is the situation typically in satellite communications systems. The technique uses a very efficient method of performing the correlation where the frequency and time space can be searched with very little performance loss. This means a low complexity, high performance solution to the problem of code (time) acquisition with frequency offset can be achieved.

[1]  Savo Glisic,et al.  New PN code acquisition scheme for CDMA networks with low signal-to-noise ratios , 1999, IEEE Trans. Commun..

[2]  Joseph I. Statman,et al.  Spread-spectrum code acquisition in the presence of Doppler shift and data modulation , 1990, IEEE Trans. Commun..

[3]  Riccardo De Gaudenzi,et al.  Signal synchronization for direct-sequence code-division multiple access radio modems , 1998, Eur. Trans. Telecommun..

[4]  Gordon J R Povey,et al.  A serial-parallel FFT correlator for PN code acquisition from LEO satellites , 1998, 1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333).

[5]  A. Polydoros,et al.  Code acquisition in CDMA cellular mobile networks. I. Theory , 1998, 1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333).

[6]  M. K. Sust,et al.  Rapid acquisition concept for voice activated CDMA communication , 1990, [Proceedings] GLOBECOM '90: IEEE Global Telecommunications Conference and Exhibition.

[7]  W. Braun.  Performance Analysis for the Expanding Search PN Acquisition Algorithm , 1982, IEEE Trans. Commun..

[8]  Andreas Polydoros,et al.  A Unified Approach to Serial Search Spread-Spectrum Code Acquisition - Part II: A Matched-Filter Receiver , 1984, IEEE Transactions on Communications.

[9]  Andreas Polydoros,et al.  A Unified Approach to Serial Search Spread-Spectrum Code Acquisition - Part I: General Theory , 1984, IEEE Transactions on Communications.

[10]  Matti Latva-aho,et al.  Design Study for a CDMA-Based LEO Satellite Network: Downlink System Level Parameters , 1996, IEEE J. Sel. Areas Commun..