Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1994-01-04
1996-02-27
Coles, Sr., Edward L.
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375354, 375376, 375373, H04L 700, H03D 324
Patent
active
054955106
ABSTRACT:
A device for synchronizing the phase of each packet of a phase modulated digital signal comprises a correction module controlled by information supplied successively by two separate calculator circuits. The phase synchronization device can be integrated into the demodulator stage of a receiver for digital signals phase modulated with at least two phase states, this signal being transmitted by successive packets. The device comprises a corrector module for rotating the constellation of phase states of the received signal according to an indication representative of the angular offset of this constellation. For each received packet to be synchronized in phase, the angular offset indication controlling the corrector module is supplied initially, for a predetermined time, by a first calculator circuit implementing the Viterbi algorithm (first indication) and thereafter, after a switching time corresponding to the end of the predetermined time, by a second calculator circuit constituted by a phase-locked loop (second indication), the second calculator circuit being initialized with the first angular offset indication at the switching time. The device enables fast phase synchronization with good noise immunity.
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Viterbi & Viterbi, "Nonlinear estimation of PSK--Modulated Carrier Phase With Application to Burst Digital Transmission", IEEE Transcations on Information Theory, vol. 29, No. 4, Jul. 1983, pp. 543.varies.551.
Sampio-Neto, Raimundo et al, "Carrier Recovery Performance in PSK Systems Using Transmission Pulses with a Square Root Raised Cosine Spectrum", IEEE International Telecommunications Symposium, 1990, Sep. 6, 1990, pp. 535-540.
D'Andrea, Aldo N. et al, "Carrier Phase Recovery for Narrow-Band Polyphase Shift Keyed Signals", Alta Frequenza, vol. 57, No. 10, Dec. 1988, pp. 67-73.
French Search Report FR 9300051 dated Sep. 16, 1993.
Alcatel Telspace
Coles Sr. Edward L.
Esposo Allan
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