Coherent demodulation method for a digitally modulated...

Details Coherent demodulation method for a digitally modulated... Coherent demodulation method for a digitally modulated...

H - Electricity

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H03K 9/00 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01) H04L 27/18 (2006.01)

Patent

CA 1308450

PHF 88 562 9-6-1989 ABSTRACT: "Coherent demodulation method for a digitally modulated signal having a continuous phase and a constant envelope" 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 comprises a known preamble sequence of N bits allowing of approximately estimating the frame-synchronization and the bit-synchronization and also the initial phase and the residual frequency offset. The progressive refinement of the said estimation is obtained by means of 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.

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