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Impulse response analysis of coherent waveguide communication

Published online by Cambridge University Press:  06 December 2017

Yanghyo Kim ,
Adrian Tang ,
Jason Cong ,
Mau-Chung Frank Chang  and
Tatsuo Itoh
Yanghyo Kim*
Affiliation:
Jet Propulsion Laboratory, Pasadena, CA, USA University of California Los Angeles, CA, USA
Adrian Tang
Affiliation:
Jet Propulsion Laboratory, Pasadena, CA, USA University of California Los Angeles, CA, USA
Jason Cong
Affiliation:
University of California Los Angeles, CA, USA
Mau-Chung Frank Chang
Affiliation:
University of California Los Angeles, CA, USA
Tatsuo Itoh
Affiliation:
University of California Los Angeles, CA, USA
*
Corresponding author: Yanghyo Kim Email: rod.kim@jpl.nasa.gov
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Abstract

An impulse response method is carried out to analyze waveguide's information capacity within a coherent communication system. Such capability is typically estimated according to group delay variations (seconds/bandwidth/distance) after carrier-modulated data undergoes a dispersive medium. However, traditional group delay methods often ignore non-linear effects by assuming input data stream only occupies narrow bandwidth such that a propagation constant can be linearized centered at the carrier frequency. Such a constraint can be lifted with a proposed baseband equivalent impulse response method by using frequency domain convolution and multiplication. Once the impulse response in frequency domain is secured, its time domain counterpart can be calculated based on inverse Fourier transformation. Such analysis can fully reveal data pulse's broadening and gauge its inter-symbol interference by simply convolving input data with extracted impulse response, not limited to specific frequency range or type of waveguide.

Keywords

EM field theory and numerical techniques
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Special Issue 1: Journee Nationale des Micro-ondes 2017 , February 2018 , pp. 101 - 113
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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