Optimal predistortion of Gaussian inputs for clipping channels

Author

Ho, Keang-Po ; Kahn, Joseph M.

Author_Institution

Bellcore, Red Bank, NJ, USA

Volume

44

Issue

11

fYear

1996

fDate

11/1/1996 12:00:00 AM

Firstpage

1505

Lastpage

1513

Abstract

For a clipped channel with a Gaussian input, a predistortion/restoration technique to reduce clipping-induced nonlinear distortion is proposed and analyzed. The input signal is processed by a nonlinear predistorter circuit, reducing the probability of clipping. The receiver output signal passes through a restorer having an inverse transfer characteristic, which yields the original signal. For both one-sided and two-sided limiter channels, the optimal predistortion curves are determined analytically. A limiter channel with Gaussian input may be used to model clipping-induced nonlinear distortion in optical-fiber common antenna television (CATV) distribution systems using multiple intensity-modulated subcarriers. When applied to an amplitude-modulated vestigial-sideband (AM-VSB) CATV system, the optimal predistortion curves yield sensitivity improvements of 5.3 and 4.4 dB for oneand two-sided limiter channels, respectively

Keywords

Gaussian processes; amplitude modulation; community antenna television; limiters; optical fibre networks; optical modulation; random processes; subcarrier multiplexing; television receivers; CATV distribution systems; Gaussian inputs; Gaussian random process; amplitude modulated vestigial sideband system; clipping channels; clipping induced nonlinear distortion; input signal; intensity modulated subcarriers; inverse transfer characteristic; nonlinear predistorter circuit; one-sided limiter channel; optical-fiber common antenna television; optimal predistortion curves; predistortion/restoration technique; receiver output signal; restorer; sensitivity improvements; subcarrier multiplexing; two-sided limiter channel; Circuits; Nonlinear distortion; Nonlinear optics; Optical distortion; Optical receivers; Optical sensors; Predistortion; Signal processing; Signal restoration; TV;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.544467

Filename

544467