H - Electricity – 04 – L
Patent
H - Electricity
04
L
325/28
H04L 7/00 (2006.01) H04L 7/027 (2006.01) H04L 7/10 (2006.01)
Patent
CA 1115777
METHOD AND DEVICE FOR ACQUIRING THE INITIAL PHASE OF THE CLOCK IN A SYNCHRONOUS DATA RECEIVER Abstract In a synchronous data transmission system wherein data transmission is achieved by modulating a carrier wave of frequency fc at the signaling rate 1/T, a method for determining the initial phase value by which the phase of the receiver clock is to be varied during an initial synchronization operation during which a synchronization signal, the spectrum of which includes two distinct lines at frequencies f1 = fc - 1/2T and f2 = fc + 1/2T, is transmitted comprising the steps of: a) sampling the synchronization signal fed into the receiver at the rate 1/T which is a multiple of the signaling rate, to provide a signal x(kT) where k = a, 1, ..., b) multiplying the signal x(T) by itself to provide a signal s(kT), c) computing the coefficient Co, which corresponds to the frequency 1/T, of the discrete Fourier transform of signal s(kT) from N samples thereof, the number N being determined from the resolution R = 1/NT required to overcome the effects of the frequency components, other than the component at frequency 1/T, of signal s(kT), and d) computing the phase of coefficient Co that repre- sents the initial phase value by which the phase of the receiver clock is to be varied.
321412
International Business Machines Corporation
Na
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