The design of asymmetrical square-root pulse-shaping filters with wide eye-openings

A method for designing square-root (SR) FIR filters that are less sensitive to receiver clock jitter is proposed. Unlike previously published methods that use only frequency domain constraints, the proposed method considers time-domain constraints as well, including the inter-symbol interference (ISI) and the opening of the eye pattern at the receiver output. Design examples show that using the time-domain constraints can result in a more robust eye opening and thus a robust ISI performance in the presence of receiver clock jitter.