Improvement of Bit Rate Using M-ary Chaotic Pulse Position Modulation

  • Nguyen Xuan Quyen School of Electronics and Telecommunications, Hanoi University of Science and Technology, Hanoi
  • Vu Van Yem School of Electronics and Telecommunications, Hanoi University of Science and Technology, Hanoi
  • Thang Manh Hoang School of Electronics and Telecommunications, Hanoi University of Science and Technology, Hanoi
DOI: https://doi.org/10.21553/rev-jec.28

Abstract

Recent studies have pointed out that Chaotic Pulse Position Modulation (CPPM) is a very promising method for improving privacy and security in chaos-based digital communication. Especially, CPPM provides better performance than other chaotic modulation methods in noise- and distortion-affected environments. In this paper we present our development of a robust method named M-ary CPPM which is based on the combination of the conventional CPPM and multi-symbol modulation in order to improve the transmission bit rate. The M-ary CPPM signal has a pulse train format in which each pulse is a symbol and the chaotically-varied inter-pulse time interval conveys the binary information of k bits (M = 2k). The analysis and development of modulation and demodulation schemes are presented in detail. Theoretical evaluation of Bit-Error-Rate (BER) performance in the presence of additive white Gaussian noise (AWGN) and the use of AWGN filtering is also provided. The chaotic behavior of the M-ary CPPM is investigated with the variation of modulation parameters. In order to verify the performance of the proposed schemes, numerical simulations were carried out in Simulink and comparison between simulation and theoretical results is reported.
Published
2011-12-31
Issue
Vol. 1, No. 3 (Jul-Sep, 2011)
Section
Regular articles
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