Coherent demodulation method for a digitally modulated signal ha

Details Coherent demodulation method for a digitally modulated signal ha Coherent demodulation method for a digitally modulated signal ha

1989-06-22

1992-09-29

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 84, 375106, H04L 2722

Patent

active

051519259

ABSTRACT:
The method ensures the coherent demodulation by digitally processing a continuous-phase modulated signal (for instance, of the GMSK type). The received signal is transposed in the baseband, converted into a digital signal and transferred to a signal processor. Each transmitted data packet has a known preamble sequence of N bits which allows for approximate estimation of the frame-synchronization and the bit-synchronization and also the initial phase and the residual frequency offset. The progressive refinement of the estimation is obtained with two interleaved digital loops: a slow loop for detecting the bit-synchronization and a fast loop effecting intermediate decisions over additional blocks of bits for the estimation of the initial phase and the residual frequency offset.

REFERENCES:
patent: 4583048 (1986-04-01), Gumacos et al.
patent: 4715047 (1987-12-01), Hambley
patent: 4847869 (1989-07-01), Labedz et al.
patent: 4888793 (1989-12-01), Chanroo et al.

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