The allowable bit-error number selection based on a bit error rate in correlating recognition for typical procedures of frame synchronization is described

and a stable and optimal performance of the system can be achieved in this way. In Search mode

a more complete expression of frame synchronization one-pass acquisition probability is obtained. In verification and lock modes

for compensating loss and gain in timing pulses

a multi-bit detection aperture is recommended. Finally

the allowable bit-error number when using the multi-bit aperture is analysed.