Abstract
In this paper, a new high spectral efficiency differential-chaos-shift-keying system based on the time-delay overlapping modulation technology (TDOP-DCSK) is proposed. In this system, the binary bits are conveyed by multiple chaotic carriers which are delayed in turn and overlapped directly in time domain, and demodulated via solving the equation system. Benefiting from the time-delay overlapping modulation, TDOP-DCSK can offer higher spectral efficiency, data transmission rate and energy efficiency. Meanwhile, as multiple information-bearing chaotic signals are delayed and overlapped, the correlation between the reference and information-bearing signal is weakened, which brings a higher security level. The spectral efficiency, energy efficiency and security are analyzed, and the analytical BER expressions are derived over both additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels. In addition, effects of various system parameters on the system performance are discussed, and the BER comparison between TDOP-DCSK and the traditional DCSK system is implemented to discover the means of TDOP-DCSK symbol constitution. The simulation results verify superiorities and show broad prospects of TDOP-DCSK.
Highlights
Due to numerous superior inherent characteristics of chaotic signals such as noise-like wavelet, sensitive dependence on initial conditions, low probability of intercept, and δ-like self-correlation functions, the chaosbased communication technology has been widely applied in many communication scenarios, for instance, multi-user spread-spectrum communications, ultra-wideband systems (UWB), power-line communications, cognitive radio systems and secure communication systems [1,2,3,4,5].Among various chaos-based communication systems, the differential chaos-shift-keying (DCSK) system has drawn extensive attention due to its simple system structure and outstanding anti-multipath interference ability [1]
Effects of various system parameters on the BER performance are evaluated, and the comparison of BER performance between time-delay overlapping modulation (TDOP)-DCSK and DCSK is carried out to show the superior of TDOPDCSK
In this paper, a new high spectral efficiency DCSK system based on time-delay overlapping modulation is proposed
Summary
Due to numerous superior inherent characteristics of chaotic signals such as noise-like wavelet, sensitive dependence on initial conditions, low probability of intercept, and δ-like self-correlation functions, the chaosbased communication technology has been widely applied in many communication scenarios, for instance, multi-user spread-spectrum communications, ultra-wideband systems (UWB), power-line communications, cognitive radio systems and secure communication systems [1,2,3,4,5]. In this paper, inspired by [36,37,38,39], we proposed a new high spectral efficiency DCSK system based on time-delay overlapping modulation, which is referred to as TDOP-DCSK, to achieve higher spectral efficiency, higher data rate and higher information security. In this design, the information is conveyed by multiple chaotic carriers, which are intentionally delayed in turn and directly overlapped in the time domain, and is demodulated through solving the corresponding equation system.
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