Timing recovery and tracking method and apparatus for data signals

A method of timing recovery and tracking with respect to data signal in a digital communication system, said method comprising the steps of:

• setting a time window for making a decision based upon a predetermined threshold level, said time window having a time period corresponding to a transmission data rate in the digital communication system;
• sampling received signal with a sampling rate which is an integral multiple of the transmission data rate to provide sampled signals;
• detecting a sampling duration t.sub.i,1 -t.sub.i,n positioned within said time window, levels of the sampled signals being higher than the predetermined threshold level during said sampling duration;
• assuming a substantially middle point of said sampling duration as an optimum decision point of the received signal;
• and
• updating the time window so that the updated time window has its center at a position of said assumed optimum decision point, thereby recovering timing synchronization with the received signal wherein I is a sample and n the number of samples.

An apparatus for timing recovery and tracking with respect to data signal in a digital communication system, said apparatus comprising:

• means for setting a time window for making a decision based upon a predetermined threshold level, said time window having a time period corresponding to a transmission data rate in the digital communication system;
• means for detecting a time duration positioned within said time window, a level of a received signal being higher than the predetermined threshold level during said time duration;
• means for assuming a substantially middle point of said sampling duration as an optimum decision point of the received signal;
• and
• means for updating the time window so that the updated time window has its center at a position of said assumed optimum decision point, thereby recovering timing synchronization with the received signal.

An apparatus for timing recovery and tracking with respect to data signal in a digital communication system, said apparatus comprising:

• means for setting a time window for making a decision based upon a predetermined threshold level, said time window having a time period corresponding to a transmission data rate in the digital communication system;
• means for sampling received signal with a sampling rate which is an integral multiple of the transmission data rate to provide sampled signals;
• means for detecting a sampling duration t.sub.i,1 -t.sub.i,n positioned within said time window, levels of the sampled signals being higher than the predetermined threshold level during said sampling duration;
• means for assuming a substantially middle point of said sampling duration as an optimum decision point of the received signal;
• and
• means for updating the time window so that the updated time window has its center at a position of said assumed optimum decision point, thereby recovering timing synchronization with the received signal wherein I is a sample number and n the number of samples.