Method for clock synchronization of a signal receiver
AssigneeBBC Brown, Boveri & Company, Limited
InventorsWalter Braun, Joachim Habermann
Life of this patent
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Abstract
In a method for clock synchronization of a signal receiver, the demodulated received signal is sampled in each of the subintervals over N time windows having in each case K subintervals (1A . . . 4C). In each case, the dispersion is calculated for the sampled values of N corresponding subintervals and the K dispersion values obtained are compared with each other. The optimum sampling time is derived from the position in time of the minimum dispersion value.
Claims10
Method for clock synchronization of a signal receiver with respect to a received signal modulated with data in the form of a baseband signal, in which method the baseband signal, in the undistributed state, can assume a plurality of permitted values at particular points of time which are periodically related to a predetermined symbol duration, and in which method the generating data sequence is scrambled in such a manner that transitions between the permitted values largely occur with the same frequency within arbitrary time windows, wherein the method comprises the steps of:
- (a) demodulating the received signal;
- (b) sampling in each subinterval (1A . . . 4C) in a number of N successive time windows which have in each case the length of one symbol duration, T.sub.s, and are subdivided into K subintervals (1A . . . 4C) the demodulated received signal;
- (c) determining the standard deviation of the sampled values over the N time windows for corresponding subintervals (1A . . . 4C) of each time window;
- and
- (d) comparing the K determined standard deviations with each other and deriving from the position in time of the smallest of these standard deviations the sampling time (T.sub.A) within each time wndow at which sampling time (T.sub.A) the demodulated received signal is to be sampled for recovering the data.
Dependencies are inferred from the claim text.