Modified feedback comb filter using harmonic distortion elimination for multi-channel demodulation

College

Gokongwei College of Engineering

Department/Unit

Electronics And Communications Engg

Document Type

Conference Proceeding

Source Title

2019 IEEE 11th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environment, and Management, HNICEM 2019

Publication Date

11-1-2019

Abstract

A comb filter is a type of elementary filter in signal processing which is implemented by adding a delayed version of a signal to the original signal. Comb filters generally exist in two general forms, these are the feed-forward and the feedback. This paper proposes a modified comb filter system that allows optimization of performance in typical applications such as conjunction with Frequency-division multiplexing (FDM). The system uses harmonic distortion elimination for multi-channel demodulation. In addition, the filter system was also constructed in Direct Form (DF) and Cascaded Form (CF) to compare the results. Results show that passing frequencies that form a geometric sequence minimizes the harmonic distortion between the passed frequencies that allows reception of several channels at once while minimizing inter-channel interference during demodulation. Moreover, the researchers also found out that the frequency ratio must be precise and accurate as much as possible because the discrepancy between a desired frequency and a received frequency is non-uniform and increasing, in the case of following a geometric sequence. © 2019 IEEE.

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Digitial Object Identifier (DOI)

10.1109/HNICEM48295.2019.9072913

Disciplines

Electrical and Electronics

Keywords

Comb filters; Demodulation (Electronics); Frequency division multiple access

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