Time division multiplexing based multiple synchronised chaotic signals transmission

Abstract

Presented is a method of transmitting multiple synchronised chaotic signals via a single channel based on time division multiplexing. Both the sampling and holding modes are used alternately during the transmission process so that multiple chaotic signals can be transmitted by sharing the single physical channel. The proposed method is implemented with an electronic circuit, and then is applied to solve simultaneous synchronisation of multi-pair chaotic systems using a single channel. Experimental results show the effectiveness of the method presented.Introduction: Chaotic signals comprise a wide range of spectrum with infinite bandwidth and are sensitive to initial conditions [1]. By synchronising a pair of master-slave chaotic signals, one can recover the message generated by the master system from the signal of the slave system [2]. The combination of synchronisation and unpredictability has led to novel non-traditional applications, such as observers for anti-control of chaos and secure communication [3,4].Usually, if only one signal is transmitted between a pair of masterslave chaotic systems, a single channel is needed to implement synchronisation [2]. However, in some cases, two or more signals are required for the synchronisation, then two or more transmission channels may be required, which would lead to a high cost of establishing transmitting and receiving devices, especially when the master and slave systems are far apart in geographic location. Multiplexing is the process of combining two or more signals and transmitting them over a single transmission channel [5]. To deliver multiple unrelated analogue signals using a single channel based on time division multiplexing (TDM) results in efficient use of the communication link [6].Based on our previous research [3,4,7], we propose a TDM based method for transmitting multiple synchronised chaotic signals via a single channel. The basic idea is to employ a zero-order holder followed by the signals to be transmitted. Both the sampling and holding modes are used during the transmission process. One of the signals is transmitted over the sampling state while other signals are transmitted over the holding period.

Tek Bir Kanaldan Kaotik Maskelenmiş Ses Sinyalinin İletilmesi

“…Many multiplexing methods are used to reduce the number of transmission channels. There are analogue and digital multiplexing methods such as Frequency-division multiplexing (FDM), Wavelength-division multiplexing (WDM), Time-division multiplexing (TDM), Code-division multiplexing (CDM) (Wu, 2010;Feng et al, 2010;Han et al, 2013;Sofi et al, 2017). FDM, one of the analogue multiplexing methods, is based on the principle that the signals to be carried in a transmission channel are placed and transported on the frequency band in accordance with the guard bands (Wu, 2010).…”