H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/80
H04L 7/00 (2006.01)
Patent
CA 1092654
SYNCHRONIZING DEVICE FOR THE RECEIVER CLOCK OF A DATA TRANSMISSION SYSTEM USING PSK MODULATION Abstract This invention relates to a new clock synchronizing arrangement for use in -the receiving device of a data trans- mission system employing PSK modulation. In PSK systems, the received signal x(t), for a given carrier angular frequency .omega.c can be defined by its envelope and its phase r (t) and ?(t), respectively. r(t) and ?(t) can be expressed by: Image and Image where x(t) is the Hilbert Transform of x(t). At the optimum signalling instant topt, r(topt) and ?(topt) normalized (without the data) exhibit the minimum variance. The clock adjustment signal is derived from the variance of the envelope or the variance of the phase of the received signal.
282527
Choquet Michel
Pilost Daniel
Vade Andre
International Business Machines Corporation
Na
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