Digital Signal Processing Of Coherent and Generation Detection of QPSK Signal

Authors(2) :-Mrs. G. Sangeetha Lakshmi, Mrs. C. Vinodhini

We demonstrate an optical quadrature phase-shift keying (QPSK) signal transmitter and an optical receiver for demodulating optical QPSK signal with homodyne detection and digital signal processing (DSP). DSP on the homodyne detection scheme is employed without locking the phase of the local oscillator (LO). In this paper, we present an extracting one-dimensional array of down-sampling method for reducing unwanted samples of constellation diagram measurement. Such a novel scheme embodies the following major advantages over the other conventional optical QPSK signal detection methods. First, this homodyne detection scheme does not need strict requirement on LO in comparison with linear optical sampling, such as having at spectral density and phase over the spectral support of the source under test. Second, the LabVIEW software is directly used for recovering the QPSK signal constellation without employing complex DSP circuit. Third, this scheme is applicable to multilevel modulation formats such as M-ary PSK and quadrature amplitude modulation (QAM) or higher speed signals by making minor changes.

Authors and Affiliations

Mrs. G. Sangeetha Lakshmi
Assistant Professor, Department of Computer Science and Applications, D.K.M College for Women (Autonomous), Sainathapuram, Vellore, Tamilnadu, India
Mrs. C. Vinodhini
Research Scholar, Department of Computer Science and Applications, D.K.M College for Women (Autonomous), Sainathapuram, Vellore, Tamilnadu, India

Optical Coherence; Quadrature Phase-Shift Keying; Digital Signal Processing

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Publication Details

Published in : Volume 4 | Issue 3 | January-February 2018
Date of Publication : 2018-03-31
License:  This work is licensed under a Creative Commons Attribution 4.0 International License.
Page(s) : 143-147
Manuscript Number : CSEIT184325
Publisher : Technoscience Academy

ISSN : 2456-3307

Cite This Article :

Mrs. G. Sangeetha Lakshmi, Mrs. C. Vinodhini, "Digital Signal Processing Of Coherent and Generation Detection of QPSK Signal", International Journal of Scientific Research in Computer Science, Engineering and Information Technology (IJSRCSEIT), ISSN : 2456-3307, Volume 4, Issue 3, pp.143-147, January-February.2018
URL : http://ijsrcseit.com/CSEIT184325

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