Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1995-06-16
1998-10-13
Chin, Wellington
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375200, 370515, 370503, H04J 306
Patent
active
058223843
ABSTRACT:
A search method for acquisition of time synchronization between a spreading sequence of a receiver and a spreading sequence of a transmitter, the receiver receiving a spread signal and demodulating the signal using the spreading sequence of the receiver includes a test step consisting in measuring the energy of the demodulated signal by integrating the demodulated signal during a time interval Tobs.sub.i and comparing that energy with a threshold value to determine if the threshold value is exceeded, for a given hypothesis as to the time shift between the spreading sequences, and modifying the time shift hypothesis if the threshold value is not exceeded and incrementing the value of a counter. Steps a and b are repeated until the value of the counter reaches a predetermined value. When the predetermined value is reached, the time interval Tobs.sub.i is replaced with a time interval Tobs.sub.i+1, with Tobs.sub.i+1 =m.Tobs.sub.i and m>1, and the process resumes at step a replacing Tobs.sub.i with Tobs.sub.i+1. The process ends when the predetermined value has been reached a predetermined number of times. The invention applies to the reception of spread signals with an unknown signal-to-noise ratio.
REFERENCES:
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IEEE Transactions on Communications, vol. COM-31, No. 5, May 1983, New York US, pp. 650-659, Dicarlo et al, Multiple Dwell Serial Search: Performance and Application to Direct Sequence Code Acquisition.
Sehier Philippe
Thebault Bertrand
Alcatel Telspace
Chin Wellington
Corrielus Jean B.
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