Year-end Sale % OFF 
Abstract
In multi-carrier differential chaos shift keying (MC-DCSK) system, channel noises pollute both the reference and data signals, resulting in deteriorated performance. To reduce noises in received signals in MC-DCSK, a novel noise reduction MC-DCSK (NR-MC-DCSK) system is proposed in this paper. The proposed system utilizes duplicated chaotic samples, rather than different ones, as the reference. At the receiver side, identical samples can be averaged before correlation detection, which helps decrease the noise interferences and thus brings performance improvement. Theoretical bit error rate (BER) expressions are derived and verified by simulation results for additive white Gaussian noise and multipath Rayleigh fading channels. Finally, comparisons to MC-DCSK and other DCSK-based systems are given to confirm the superiority of the proposed system in BER performance.
Highlights
IntroductionWith noise-like spectrum as well as sharp auto-correlation and low cross-correlation characteristics, chaotic signals have been applied in wireless communications in recent years.[1,2,3,4,5] As low-cost substitutions for traditional spread spectrum (SS) systems, lots of chaos-based modulation schemes that map data symbols to nonperiodic and wideband chaotic wavelets have been proposed and studied.[6,7,8,9,10,11,12] They have similar advantages as other SS communication systems, including antijamming capability and resistance to multipath fading, and achieve better data security.[13]
The reference and data-bearing signals in di®erential chaos shift keying (DCSK) are transmitted in a parallel way via the orthogonal Inphase and quadrature channels in Ref. 10 for doubled bit rate, which helps to remove the radio frequency delay lines that are quite di±cult to integrate in ultrawide band (UWB) communications but brings no bit error rate (BER) performance improvement in comparison with DCSK
The proposed system as well as multi-carrier di®erential chaos shift keying (MC-DCSK) is simulated over AWGN and multipath Rayleigh fading channels
Summary
With noise-like spectrum as well as sharp auto-correlation and low cross-correlation characteristics, chaotic signals have been applied in wireless communications in recent years.[1,2,3,4,5] As low-cost substitutions for traditional spread spectrum (SS) systems, lots of chaos-based modulation schemes that map data symbols to nonperiodic and wideband chaotic wavelets have been proposed and studied.[6,7,8,9,10,11,12] They have similar advantages as other SS communication systems, including antijamming capability and resistance to multipath fading, and achieve better data security.[13]. In 2013, a multi-carrier DCSK (MC-DCSK) system is proposed in Ref. 16 by combining MCM with DCSK based on FDMA This system converts a serial high rate bit stream into multiple parallel low rate bit sub-streams and sends the reference and multiple data signals, respectively, over one predened subcarrier and the other remaining subcarriers. Compared to DCSK, MCM help these systems solve the delay line problem and brings them higher bit rate, higher spectral e±ciency, increased energy e±ciency and better BER performance.[16,17,18,19] all of these systems still su®er from a major drawback that both the received reference and data signals are polluted by the channel noise, which will greatly degrade the system BER performance.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
