Reis, AntónioRocha, José Ferreira daGameiro, AtilioCarvalho, José Pacheco de2019-10-292019-10-2920171816-093Xhttp://hdl.handle.net/10400.6/7427This work studies the asynchronous sequential symbol synchronizers based on pulse comparison by positive transitions at quarter bit rate. Their performance will be compared with the standard reference asynchronous symbol synchronizers based on pulse comparison by both transitions at bit rate. For the reference and proposed variants, we consider two versions which are the manual (m) and the automatic (a). In systems with no linear distortion, the sysnchronizers of positive transitions can be preferable to the both transitions. The objective is to study the four synchronizers and evaluate their output jitter UIRMS (Unit Interval Root Mean Square) versus input SNR (Signal Noise Ratio).engSynchronismDigital Communicationsjournal article