Process for obtaining a signal indicating a synchronization error between a pseudo-random signal sequence from a transmitter and a reference pseudo-random signal sequence from a receiver

DETAILED DESCRIPTION The present invention improves on the known process in such a way that a synchronization error between a pseudo-random signal sequence from a transmitter and a reference pseudo-random signal sequence from a receiver can be detected more rapidly so the synchronous status can be restored relatively quickly.
According to an embodiment of the present invention, each of the successive sections of the reference pseudo-random signal sequence is cross-correlated with the received pseudo-random signal sequence, yielding partial cross-correlation functions which are added together to obtain a sum cross-correlation function.
The maximums of the sum cross-correlation function are detected and monitored for their occurrence in time, and if at least three maximums in the sum cross-correlation function do not occur at the correct time, the signal indicating the synchronization error is generated.
An important advantage of the process according to the present invention is that a synchronization error can be detected relatively quickly, so that measures known from the above-mentioned publication for synchronization between the transmitter and receiver can then be taken.
The time for determining the occurrence of a synchronization error in the process according to the present invention is determined by the number of partial cross-correlation functions used to form the sum cross-correlation function.
A synchronization error can be detected more rapidly if more partial cross-correlation functions are generated.
The process according to the present invention does not depend on the length of the respective pseudo-random signal sequence itself.
In the process according to an embodiment of the present invention, the lengths of the sections of the reference pseudo-random signal sequence can be selected relatively freely and may even differ from each other, because this is taken into account in the analysis.
In order to make the process according to the present invention as easy to carry out as possible, it is especially advantageous if successive sections of the reference pseudo-random signal sequence of approximately the same length are cross-correlated with the received pseudo-random signal sequence