Partial-Response Signaling

TLDR

Partial‑response signaling (PRS) systems have been studied, yet a unified comparison of PRS schemes has been lacking. The study aims to provide a unified comparison of PRS schemes, extending prior work. A PRS system model is introduced to analyze spectral properties and compare schemes via speed tolerance, eye width, and SNR degradation, with a new speed tolerance definition and precoding analysis. The analysis reveals analytically computable eye width, exact SNR degradation values and bounds, and identifies desirable properties and new useful PRS schemes.

Abstract

This paper presents a unified study of partial-response signaling (PRS) systems and extends previous work on the comparison of PRS schemes. A PRS system model is introduced which enables the investigation of PRS schemes from the viewpoint of spectral properties such as bandwidth, nulls, and continuity of derivatives. Several desirable properties of PRS systems and their relation to system functions are indicated and a number of useful schemes, some of them not previously analyzed, are presented. These systems are then compared using as figures of merit speed tolerance, minimum eye width, and signal-to-noise ratio (SNR) degradation over ideal binary transmission. A new definition of speed tolerance, which takes into account multilevel outputs and the effect of sampling time, is introduced and used in the calculation of speedtolerance figures. It is shown that eye width, a performance measure that has not been used previously in comparing PRS systems, can be calculated analytically in many cases. Exact values as well as bounds on the SNR degradation for the systems under consideration are presented. The effect of precoding on system performance is also analyzed.