Analysis of quantized feedback low-frequency restoration in digital regenerators

Author

Kandlikar, Milind ; Jacobs, Ira

Author_Institution

Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

Volume

38

Issue

8

fYear

1990

fDate

8/1/1990 12:00:00 AM

Firstpage

1118

Lastpage

1120

Abstract

Quantized feedback, a DC restoration technique utilizing decision feedback equalization, can be used to compensate for unavoidable low-frequency cutoff in digital regenerators. An analysis is provided of the error probability and sensitivity to timing offsets of quantized feedback for a single-pole high-pass filter regenerator characteristic. Error probability is expressed in terms of the moments of the intersymbol interference (ISI), and these moments are calculated using the Markov chain properties of the ISI. To keep degradations small, the low-frequency cutoff should be no greater than 15% of the bit rate

Keywords

digital communication systems; equalisers; feedback; high-pass filters; intersymbol interference; repeaters; DC restoration technique; ISI; Markov chain; decision feedback equalization; digital regenerators; error probability; intersymbol interference; low-frequency cutoff; quantized feedback; sensitivity to timing offsets; single-pole high-pass filter regenerator; Additive noise; Bit rate; Cutoff frequency; Degradation; Error probability; Filters; Intersymbol interference; Laser feedback; Optical feedback; Performance analysis;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.58740

Filename

58740