An Oversampling-based Correlator-type Receiver for DCSK Communication Systems Over Generalized Flat Rayleigh Fading Channels

  • Quyen Xuan Nguyen Hanoi University of Science and Technology
DOI: https://doi.org/10.21553/rev-jec.82

Abstract

This paper proposes an oversampling-based correlator-type receiver for Differential Chaos-shift Keying (DCSK) communication systems, which can exploit the flat-fading characteristic of multipath channels in order to improve the system performance. At the receiver, the incoming signal is sampled with a sampling rate higher than chip rate before feeding to a correlator. This oversampling step aims to specifically determine delayed-signal components from fading multipath channels, which can be combined together by the correlator in order to increase the ratio of signal-to-noise at its output. In particular, the performance of the proposed receiver is investigated by means of a generalized flat Rayleigh fading channel which has one primary path (i.e., the path having the shortest transmission period) and multiple secondary paths (i.e., the other remaining paths with delays). Mathematical models in discrete-time domain for the conventional transmitter, generalized channel, and proposed receiver are proposed and analyzed. The theoretical bit-error-rate (BER) expression is first derived and then distribution histogram for the ratio of variable bit energy to noise power spectral density is computed. The BER performance is finally estimated by integrating the BER expression over all possible values of the histogram. Numerical simulations with specific parameters are carried out and then simulated performances are shown in comparison to estimated ones. Obtained results point out that the system performance is significantly improved when the number of secondary paths increases.

Author Biography

Quyen Xuan Nguyen, Hanoi University of Science and Technology
Nguyen Xuan Quyen received the Diploma of Engineer, Master and PhD degrees in Electronic Engineering and Telecommunication Technologies, from Hanoi University of Science and Technology, Vietnam in 2006, 2008 and 2013, respectively. During 2007-2011, he has stayed with the School of Electronics and Telecommunications (SET), Hanoi University of Science and Technology (HUST), Vietnam. From 2011 to 2012, he was a sandwich PhD student at the Institute for Smart System Technologies, Alpen-Adria Klagenfurt University, Austria. He has served as a senior lecturer at the SET of HUST during 2012-2013. From 2014 to present, he has been working as a postdoctoral researcher at the Department of Computer Architecture, Polytechnic University of Catalonia (UPC BarcelonaTech), Barcelona, Spain. He was also a visiting academic staff at the Department of Electronic and Computer Engineering, University of Limerick, Ireland in 2015. His main research interests are microwave engineering, chaos-based digital communications and physical layer security, and wireless communications.
Published
2016-09-16
Issue
Vol. 6, No. 1-2 (Jan-Jun, 2016)
Section
Regular articles
An author's submission implies that the manuscript has not been published previously, and is not currently submitted for publication elsewhere. Submission also implies that the Corresponding Author has consent of all authors (the Authors). Upon acceptance for publication transfer of copyright will be made to the Publisher of REV-JEC, who guarantees that full content of the published article is freely distributed on the Journal's website. The copyright transfer gives the Publisher of REV-JEC full authority to resolve any complaints of misuse or abuse (such as infringement or plagiarism) of the published article. The Authors have the freedom to redistribute and reuse the published article in any medium or format for any purpose, provided the original published article is properly cited. An article submission implies author agreement with this policy.