Optimized clock recovery for an MSK system

Details Optimized clock recovery for an MSK system Optimized clock recovery for an MSK system

1991-10-31

1993-12-28

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 64, 375 90, H04L 2710

Patent

active

052746720

ABSTRACT:
A clock recovery system for radio communication inserts a synchronization signal (102) at a frequency of 1/2 the baud rate, at the spectral null of an MSK data signal (108), which is also at 1/2 the baud rate, for later retrieval. Hence, in a transmitter-encoder (100), an MSK generator (106) generates an MSK digitally modulated data signal (108e) having a baud rate and a spectral null at 1/2 the baud rate. A synchronization clock generator (104) generates a synchronization signal (102e) having a frequency at 1/2 the baud rate. This frequency at 1/2 the baud rate corresponds to the spectral null of the MSK digitally modulated data signal (108e). A transmitter transmits the synchronization signal (102e), at the spectral null of the data signal (108e), together (112) with the MSK digitally modulated data signal (108e). On the other end, a receiver-decoder (200) recovers (214) the synchronization signal (102d) and demodulates (212) the MSK digitally modulated data signal (108d) as a function of the synchronization signal (102d).

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