Experimental Study on FM-CSK Communication System for WSN

Abstract

The current paper presents the experimental study of the frequency-modulated chaos shift keying (FM-CSK) communication system. The proposed system has the potential to enhance the security aspects of the physical layer to meet the needs for safe data transmission in wireless sensor networks (WSN). Compared to common digital FM-DCSK, the studied analog FM-CSK communication system provides a more straightforward design. As chaos oscillators are the core elements of the FM-CSK communication system, the paper investigates the selected oscillators’ properties, including the implementation aspects—the impact of reactive element value deviations on dynamics and synchronization stability. Chaotic dynamics are evaluated with the mean-square-displacement-based 0–1 test, while correlation analysis is used to evaluate synchronization. The impact of the different chaos oscillators’ employment on FM-CSK communication system performance is examined, and the bit error ratio is used for noise immunity evaluation.

Experimental Study on Colpitts Chaotic Oscillator-Based Communication System Application for the Internet of Things

“…Understanding these spectral characteristics is criti enhancing system performance and guaranteeing efficient signal processing. Furthermore, cross-correlation functions were calculated within a single Colpitts chaos oscillator to evaluate the chaotic behavior and determine the shortest bit length [59]. Figure 6 depicts the cross-correlation functions between V C1 and V C2 , V C1 and I L1 , and V C2 and I L1 .…”

“…The bit length is calculated by identifying the settling point of the amplitude inside the cross-correlation function and linking it with the associated time shift. This method provides the proper choice of minimal bit length [59]. Based on the cross-correlation function analysis, a minimum bit length of 6 µs is required to ensure its distinguishability during detection, limiting the data transmission rate to 166.7 Kbps.…”

“…In previous works, frequency-modulated chaos shift keying (FM-CSK) and quadrature chaos phase-shift keying (QCPSK) communication systems were proposed [59,60] for IoT physical layer security enhancements. Still, the proposed systems had a significant shortcoming in the form of low data transmission rates.…”

Use of memristor-based chaotic circuits in AM-DCSK and FM-DCSK modulation

“…This circuit consists of a simple third-order autonomous circuit with many dynamic behaviors. There are numerous publications on chaos based communication in the literature [45][46][47][48][49][50]. Litvinenko et al introduced a chaotic communication system that relies on a modified version of the Chua circuit [45].…”

“…The researchers presented results from practical experiments and simulations to validate the effectiveness of their approach. Cirjulina et al conducted an experimental investigation of a frequency modulated chaos shift keying (FM-CSK) communication system [46]. The main objective of this system is to enhance the security aspects of the physical layer, catering to the requirements of secure data transmission in wireless sensor networks (WSN).…”