Extended research on prefilter bandwidth effects in asynchronous sequential symbol synchronizers based on pulse comparison by positive transitions at quarter bit rate

This work studies the prefilter bandwidth effects in four asynchronous sequential symbol synchronizers. We choose three different bandwidths, namely B1=∞, B2=2.tx and B3=1.tx, where tx is the bit rate. First, we developed various synchronous prototypes. After, we developed various asynchronous prototypes. The synchronizer has two variants, which are the reference standard operating by both transitions at bit rate and the new proposal operating by positive transitions at quarter bit rate. Each variant has two versions, namely the manual and the automatic. The objective is to study the prefilter with the four synchronizers and to evaluate their output jitter UIRMS (Unit Interval Root Mean Square) versus input SNR (Signal Noise Ratio).University of Beira Interior