@article{MTMT:33611138,
	title = {Design and Performance Analysis of a Robust Multi-Carrier M -Ary DCSK System: A Noise Suppression Perspective},
	url = {https://m2.mtmt.hu/api/publication/33611138},
	author = {Cai, Xiangming and Xu, Weikai and Wang, Lin and Kolumbán, Géza},
	doi = {10.1109/TCOMM.2022.3144276},
	journal-iso = {IEEE T COMMUN},
	journal = {IEEE TRANSACTIONS ON COMMUNICATIONS},
	volume = {70},
	unique-id = {33611138},
	issn = {0090-6778},
	year = {2022},
	eissn = {1558-0857},
	pages = {1623-1637},
	orcid-numbers = {Cai, Xiangming/0000-0001-8879-9352; Xu, Weikai/0000-0001-7172-1807; Wang, Lin/0000-0002-6698-129X}
}

@article{MTMT:33185899,
	title = {Double-Stream Differential Chaos Shift Keying Communications Exploiting Chaotic Shape Forming Filter and Sequence Mapping},
	url = {https://m2.mtmt.hu/api/publication/33185899},
	author = {Bai, Chao and Zhao, Xiao-Hui and Ren, Hai-Peng and Kolumbán, Géza and Grebogi, Celso},
	doi = {10.1109/TWC.2021.3135043},
	journal-iso = {IEEE T WIREL COMMUN},
	journal = {IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS},
	volume = {21},
	unique-id = {33185899},
	issn = {1536-1276},
	abstract = {A new Differential Chaos Shift Keying modulation scheme exploiting Chaotic Shape-forming Filter and Sequence Mapping (CSF-SM-DCSK) is being proposed. The new CSF-SM-DCSK system employs a novel sequence mapping rule and includes a data correction module to achieve a good trade-off between the low Bit Error Rate (BER) performance and high transmission rate. It transmits two data streams simultaneously and preserves the simplicity and robustness of DCSK method. Channel one, transmitting a Low Priority Stream (LPS), generates the chaotic carrier by a Chaotic Shape-forming Filter (CSF) at the transmitter and applies a coherent Matched Filter (MF) at the receiver to recover the information. Channel two, transmitting a High Priority Stream (HPS), relies on conventional DCSK modulation, while the reference and information-bearing parts are transmitted simultaneously with orthogonal sine and cosine carriers. This double-stream solution eliminates the need for analog RF delay lines and doubles the data transmission rate. Before feeding the LPS data stream into the modulator, each LPS bit is encoded into a symbol sequence using sequence mapping. This approach, together with the coherent MF reception, equips the LPS channel with an extremely high robustness against channel noise and multipath propagation. To handle every possible redundancy in the received signal and to minimize the possibility of making wrong decisions, a data correction block is also introduced. Initially, a rough estimation of the received HPS DCSK bit is done at the receiver, then this estimation is used to remove the DCSK modulation from the received information-bearing signal. The three inputs of data correction blocks are: (i) the reference and (ii) the information-bearing parts of the received signal in their original form, and (iii) the received information-bearing signal where the DCSK modulation is removed. The data correction block improves the BER performance while the increased channel capacity, enabled by the double-stream approach, improves the spectral efficiency. Analytical expressions are derived to predict the BER performances in additive white Gaussian noise channel for both the LPS and HPS channels. Computer simulations are used to show that the system performance of the CSF-SM-DCSK modulation scheme proposed in this work is superior to that of the already published solutions. In addition to the computer simulations, the new chaos-based wireless communications system has been implemented on a wireless open-access research platform to experimentally demonstrate the feasibility and the superiority of CSF-SM-DCSK.},
	keywords = {MODULATION; Bit error rate; Chaotic communications; Demodulation; Matched filter; wireless communication; Delay lines; system performance; Chaotic communication; DCSK; sequence mapping; Chaotic shape-forming filter},
	year = {2022},
	eissn = {1558-2248},
	pages = {4954-4972},
	orcid-numbers = {Ren, Hai-Peng/0000-0003-3834-5103; Grebogi, Celso/0000-0002-9811-4617}
}

@article{MTMT:31688690,
	title = {Double-Sub-Stream M-ary Differential Chaos Shift Keying Wireless Communication System Using Chaotic Shape-Forming Filter},
	url = {https://m2.mtmt.hu/api/publication/31688690},
	author = {Bai, Chao and Ren, Hai-Peng and Kolumbán, Géza},
	doi = {10.1109/TCSI.2020.2993674},
	journal-iso = {IEEE T CIRCUITS-I},
	journal = {IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS},
	volume = {67},
	unique-id = {31688690},
	issn = {1549-8328},
	abstract = {An M-ary Differential Chaos Shift Keying modulation using Chaotic Shape-forming Filter (CSF-M-DCSK) is proposed here to transmit two sub-streams with different system performances. The chaotic shape-forming filter is used to generate the chaotic carrier which is modulated according to the DCSK concept. The modulated chaotic signal is demodulated by a coherent matched filter receiver and the maximum likelihood decision rule is used to get the best noise performance. Compared to DCSK and its enhanced versions, the new modulation scheme offers not only better noise and multipath performances but also a higher data rate. The hardware implementation of the proposed method is as simple as that of a conventional communication system. Analytical expressions have been derived for the CSF-M-DCSK Bit Error Rate (BER) and its performance has been evaluated in AWGN and multipath channels by simulations. The new CSF-M-DCSK system has been implemented and successfully tested on a Wireless open-Access Research Platform (WARP). Results of simulations and measurements performed in real application scenarios have proven the feasibility and superiority of CSF-M-DCSK over its competitors.},
	keywords = {MODULATION; Matched filter; Matched filters; RECEIVERS; wireless communication; wireless communication; Delay lines; Chaotic communication; Chaotic communication; DCSK; Chaotic shape-forming filter},
	year = {2020},
	eissn = {1558-0806},
	pages = {3574-3587},
	orcid-numbers = {Ren, Hai-Peng/0000-0003-3834-5103}
}

@article{MTMT:31477694,
	title = {Multicarrier M-Ary Orthogonal Chaotic Vector Shift Keying With Index Modulation for High Data Rate Transmission},
	url = {https://m2.mtmt.hu/api/publication/31477694},
	author = {Cai, Xiangming and Xu, Weikai and Wang, Lin and Kolumbán, Géza},
	doi = {10.1109/TCOMM.2019.2957431},
	journal-iso = {IEEE T COMMUN},
	journal = {IEEE TRANSACTIONS ON COMMUNICATIONS},
	volume = {68},
	unique-id = {31477694},
	issn = {0090-6778},
	abstract = {A new multicarrier M-ary orthogonal chaotic vector shift keying with index modulation (MC-MOCVSK-IM) is presented in this paper. In this design, information bits are conveyed not only by the multiple groups of M-ary information bearing signals, but also by the specific indices of the selected reference signals which depend on the incoming mapped bits. Benefiting from the favorable features of multicarrier modulation, M-ary modulation and index modulation, MC-MOCVSK-IM system is capable to offer higher energy efficiency and spectral efficiency at some expense of hardware complexity. In addition, the analytical bit error rate (BER) expressions of MC-MOCVSK-IM system are derived over additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels. The BER performance comparison between MC-MOCVSK-IM system and other non-coherent chaotic communication systems is carried out to highlight the superiority of MC-MOCVSK-IM system in terms of BER performance. Considering the dramatically increased demand for high-data-rate transmission and the harsh environment of future wireless communication, MC-MOCVSK-IM system shows strong robustness and offers competitive solutions for high-data-rate non-coherent chaotic communication systems.},
	keywords = {Multicarrier modulation; Index modulation; Chaotic communication; High data rate; orthogonal chaotic vector shift keying (OCVSK); M-aryn modulation},
	year = {2020},
	eissn = {1558-0857},
	pages = {974-986},
	orcid-numbers = {Cai, Xiangming/0000-0001-8879-9352}
}

@misc{MTMT:30970967,
	title = {Universal Portable SDE Platforms: Enebling a Revolutionary New Way of Teaching the Theory and Practice of ICT Systems},
	url = {https://m2.mtmt.hu/api/publication/30970967},
	author = {Kolumbán, Géza},
	unique-id = {30970967},
	year = {2019}
}

@misc{MTMT:30970952,
	title = {Cyber-Physical and IoT Systems, Biomedical Applications: Emerging Areas Where Brand New ICT Tools and Algorithms Are Required},
	url = {https://m2.mtmt.hu/api/publication/30970952},
	author = {Kolumbán, Géza},
	unique-id = {30970952},
	year = {2019}
}

@misc{MTMT:30767756,
	title = {SDE Concept and Embedded Implementation in ICT Applications: From the Theory to a Working Universal HW Platform},
	url = {https://m2.mtmt.hu/api/publication/30767756},
	author = {Kopacz, Zsófia and Kolumbán, Géza},
	unique-id = {30767756},
	abstract = {The general trend of our time is that the HW and SW components are completely separated in the latest ICT
		implementations, the different applications are implemented entirely in SW, and only one universal HW
		device is used to establish the transformation between the data streams processed and generated in SW on
		a computing platform and the physical signals measured in the real world. The most important feature of
		SW implementation is that both the functionality and parameters of a given application can be changed
		easily in SW. The block diagram of SDE concept is shown in Fig. 1 where the real-world analog signals are
		shown in red, the green universal RF HW devices perform the transformation between the real-world analog
		signals and their baseband digital equivalents and all applications are implemented in the SW shown in blue.
		Fig. 1. Generic block diagram of equivalent BB implementation. The transformations between the RF band-pass and
		BB low-pass domains are performed in both directions by the Universal RF HW device. Analog RF band-pass signals
		and their BB equivalents, the complex envelopes, are given in red and blue, respectively.
		In Figure 1 the computing platform is represented by the blue boxes marked by „SW implementation”. In
		SDE concept, the universal RF HW transformers are embedded in this computing platform. The computing
		device and the universal HW transformers together form the universal HW platform.The two key issues are
		(i) how the minimum sampling rate required by the distorless information processing can be assured and
		(ii) how the embedded operation, i.e., the smooth transition between the two domains can be achieved.
		The contribution proposed here will answer these basic questions. The SDE concept exploits the theory of
		complex envelopes because the complex envelopes assure the use of minimum sampling rate, attainable
		theoretically, when the information to be processed is carried by bandpass signals. First the talk will survey
		the theory of complex envelopes including deterministic and random signals, LTI systems. It will be shown
		how an ICT system working on the bandpass real-world analog signals can be substituted by its digital
		baseband equivalent. Then the implementation of the universal HW transformers and their embedded
		operation will be discussed. Finally it will be shown how these SW and HW components can be integrated
		into one single solution in order to get a universal HW platform which can be used to implement any kind
		of ICT, data communications and information processing system, entirely in SW.},
	year = {2019}
}

@inproceedings{MTMT:30684688,
	title = {Universal Portable SDE Platform for Teaching the Theory and Practice of ICT Systems},
	url = {https://m2.mtmt.hu/api/publication/30684688},
	author = {Kolumbán, Géza and Krébesz, Tamás István},
	booktitle = {2019 IEEE International Symposium on Circuits and Systems (ISCAS)},
	doi = {10.1109/ISCAS.2019.8702408},
	unique-id = {30684688},
	abstract = {A universal portable software defined electronics platform developed to teach info-communications systems is proposed here. Because every application is implemented in software, the universal platform is suitable for the implementation and simulation of any kind of communications or measurement systems where the information is carried by band-pass signals. The software defined electronics platform needs only a laptop and two universal software radio peripheral devices, and it can be used everywhere without a laboratory infrastructure.},
	keywords = {Software defined electronics},
	year = {2019},
	pages = {1-5}
}

@{MTMT:30625081,
	title = {SDE implementation of chaos-based communications systems},
	url = {https://m2.mtmt.hu/api/publication/30625081},
	author = {Kolumbán, Géza},
	booktitle = {Advances on Nonlinear Dynamics of Electronic Systems},
	doi = {10.1142/9789811201523_0008},
	unique-id = {30625081},
	year = {2019},
	pages = {41-45}
}

@misc{MTMT:30456398,
	title = {Concept of Software Defined Electronics},
	url = {https://m2.mtmt.hu/api/publication/30456398},
	author = {Kun, Péter and Kolumbán, Géza},
	unique-id = {30456398},
	year = {2019}
}