Volume 116, Number 5, December 2016
|Number of page(s)||7|
|Published online||01 February 2017|
Mixed coherent states in coupled chaotic systems: Design of secure wireless communication
CSIR-Indian Institute of Chemical Biology - 4 Raja S C Mullick Road, Kolkata 700032, India
Received: 30 September 2016
Accepted: 9 January 2017
A general coupling design is proposed to realize a mixed coherent (MC) state: coexistence of complete synchronization, antisynchronization, and amplitude death in different pairs of similar state variables of the coupled chaotic system. The stability of coupled system is ensured by the Lyapunov function and a scaling of each variable is also separately taken care of. When heterogeneity as a parameter mismatch is introduced in the coupled system, the coupling function facilitates to retain its coherence and displays the global stability with renewed scaling factor. Robust synchronization features facilitated by a MC state enable to design a dual modulation scheme: binary phase shift key (BPSK) and parameter mismatch shift key (PMSK), for secure data transmission. Two classes of decoders (coherent and noncoherent) are discussed, the noncoherent decoder shows better performance over the coherent decoder, mostly a noncoherent demodulator is preferred in biological implant applications. Both the modulation schemes are demonstrated numerically by using the Lorenz oscillator and the BPSK scheme is demonstrated experimentally using radio signals.
PACS: 05.45.Vx – Communication using chaos / 05.45.Gg – Control of chaos, applications of chaos / 05.45.Xt – Synchronization; coupled oscillators
© EPLA, 2016
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