Article
Telecommunications
Sujie Liu, Pingping Chen, Guanrong Chen
Summary: The proposed DPI-DCSK modulation scheme offers an efficient alternative for chaos-based wireless communication, outperforming traditional PI-DCSK in terms of transmission energy utilization and performance gain. Theoretical analysis and simulation results demonstrate the performance advantage of DPI-DCSK over PI-DCSK in multipath Rayleigh fading channels and practical ultra-wideband channels.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Zixian Lin, Weikai Xu, Haixin Sun, Lin Wang
Summary: In this paper, a hybrid DCSK scheme combining cyclic shift keying and code index modulation (CSK-CIM-DCSK) is proposed to improve data rate and BER performance. The analytical BER expressions of the CSK-CIM-DCSK are derived and validated through simulations. The results show that the proposed scheme outperforms DCSK with code index modulation (CIM-DCSK) in terms of BER performance.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jun Li, Shuping Dang, Yu Huang, Pengxu Chen, Xiaomin Qi, Miaowen Wen, Huseyin Arslan
Summary: In this paper, a composite multiple-mode orthogonal frequency division multiplexing with index modulation (C-MM-OFDM-IM) scheme is proposed to increase the spectral efficiency (SE) of OFDM-IM systems by extending the indexing to the energy and constellation domains. A variant IM scheme named C-MM-OFDM-IM-II is also proposed to further increase the SE of C-MM-OFDM-IM. Upper-bounded bit error rate (BER) and lower-bounded achievable rate are both derived to evaluate the performance of C-MM-OFDM-IM(-II).
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Jiaojiao Liu, Yuanmei Yan, Hua Yu, Biyun Ma
Summary: This letter proposes a method to estimate the performance of LoRa in heavy multipath channels using approximations. By analyzing the interference caused by path overlapping quantitatively, the authors derive simple approximations for bit error rate in both coherent and non-coherent detections. They verify their expressions through Monte Carlo simulations with a realistic indoor industrial scenario model. Performance comparison results demonstrate that a high spreading factor can lead to severe multipath overlap and reduce the bit error rate.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Haipin Chen, Pingping Chen, Shaohao Wang, Songlin Lai, Riqing Chen
Summary: In this paper, a reference-modulated permutation index differential chaos shift keying (RM-PI-DCSK) scheme is proposed for multipath fading channels. The scheme utilizes the quasi-orthogonal property between different permutated chaotic signals to suppress inter-sequence interference and recover desired information. The results show that the proposed RM-PI-DCSK achieves a performance gain of 3 dB over conventional PI-DCSK, especially in high-delay-spread channels.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Mathematics, Interdisciplinary Applications
Y. Wang, H. Yang, X. Y. Yan, G. P. Jiang
Summary: In this paper, a novel coupled code shifted M-ary differential chaos shift keying modulation scheme is proposed for reference removal. The scheme transmits only two information-bearing signals, modulated by selected Walsh code sequences and coupled by the same chaotic message bearer. Theoretical BER expressions are derived and simulations show better performance with lower complexity.
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
(2023)
Article
Engineering, Electrical & Electronic
Kaijie Wang, Ting Zhou, Tianheng Xu, Honglin Hu, Xiaoming Tao
Summary: This paper introduces an asymmetric adaptive modulation (AAM) framework for uplink NOMA systems, develops an AAM algorithm by studying closed-form BER expressions and reducing performance uncertainty, and shows that the AAM algorithm outperforms the benchmark in terms of system sum throughput.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Haodong Zheng, Lin Zhang, Zhicheng Dong, Hongcheng Zhuang, Zhiqiang Wu, Lin Wang, Weikai Xu
Summary: This paper proposes a deep learning-based approach to improve the reliability of information transmission in high-speed railway systems. The proposed scheme utilizes a deep neural network and long short-term memory unit for joint demodulation and feature extraction to handle changing channel conditions. Simulation results demonstrate that the proposed scheme achieves better performance in various channel conditions.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Telecommunications
Huaijin Zhang, Dejin Kong, Yu Xin, Lixia Xiao, Tao Jiang
Summary: The combined application of FB-OFDM and index modulation (IM) (FB-OFDM-IM) is proposed to improve bit error rate (BER) performance. An upper bound of average bit error probability (ABEP) is derived over multipath fading channel and a low-complexity maximum likelihood (ML) detection method is designed at receiver. Simulation results confirm the superiority of the FB-OFDM-IM system in terms of BER performance.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Peng Du, Yuan Zhang
Summary: This work investigates the bit error rate (BER) formula of orthogonal time frequency space (OTFS) modulation with message-passing (MP) receiver over doubly selective fading channel. The equivalent signal models of the MP receiver are defined, and the expression of the signal-noise-ratio (SNR) is derived. The probability distribution function of the SNR is estimated by assuming a lognormal distribution, and the parameters of the distribution function are estimated. Finally, the formula for calculating the BER of OTFS modulation with MP receiver is obtained and verified through simulations.
IET COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Hongyan Zhang, Yue Xiao, Wanbin Tang, Gang Wu, Hong Niu, Xiaotian Zhou
Summary: In this paper, a novel directional modulation scheme with distributed receiver selection (DM-DRS) is proposed for secure wireless communications. Numerical results demonstrate that the scheme can achieve a higher transmission rate compared to traditional methods while ensuring improved Bit Error Rate (BER) performance.
SCIENCE CHINA-INFORMATION SCIENCES
(2021)
Article
Computer Science, Information Systems
Yunye Li, Lin Dai, Liang Lv
Summary: Differential chaos shift keying (DCSK) is a promising communication technique in the Internet of Things (IoT) scenario. Among various DCSK schemes, M-ary DCSK schemes suit LDPC code especially well dispense with the channel state information in demodulator. We propose an improved decoder design using a novel initial chaotic signal estimation (ICSE) algorithm to fully utilize the information of the repeated chaotic signals and improve the error performance. Additionally, a novel protograph code is proposed using protograph extrinsic information transfer (P-EXIT) algorithm to further boost the system performance.
Article
Engineering, Electrical & Electronic
Apurve K. Pandey, Kallapu Reeshitha, Soumya P. Dash
Summary: A non-multipath and receive diversity power line communication system subject to Rayleigh fading is analyzed in this paper. The optimal receiver structures for non-multipath and multipath PLC systems are proposed, and closed-form expressions for symbol error probability are derived. The optimal symbol correlation matrix for MFSK modulation is obtained using a search-based algorithm to achieve minimal SEP values.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Nurul Sarkar, Roman Ammann, Salahuddin Muhammad Salim Zabir
Summary: This paper addresses the performance issues of TCP under high bit error rates (BERs) and analyzes the impact of BERs on system performance. Through extensive simulation and modeling, the study focuses on TCP Reno and explores various factors such as datagram transmission, throughput, link-layer overhead, window size, FTP download response time, packet dropping and retransmission, and congestion avoidance. The results demonstrate that TCP throughput significantly degrades and eventually collapses at a packet drop probability of 10% (BER = 10(-5)). Additionally, the FTP download response time is found to be 32 times longer compared to a perfect channel with no packet dropping. Recommendations are provided for researchers and engineers dealing with TCP operation over noisy channels.
Article
Acoustics
Bin Li, Feng Tong, Siyuan Zheng, Dongsheng Chen
Summary: This paper proposes an iterative Doppler estimation algorithm based on bit-error-rate (BER) gradient descent strategy to reduce search complexity, with smoothed gradient and variable Doppler increment to improve convergence rate and avoid local optimums. The effectiveness and superiority of the proposed BER gradient descent Doppler estimation algorithm is verified through numerical simulations and sea trials.
Article
Telecommunications
Xiangming Cai, Weikai Xu, Shaohua Hong, Lin Wang
Summary: The TCS-DCSK system eliminates the reference signal traditionally used in differential chaos shift keying technology, improving energy efficiency and outperforming competitors. Additionally, under additive white Gaussian noise and multipath Rayleigh fading channels, the TCS-DCSK system demonstrates superior bit error rate performance.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Telecommunications
Xiangming Cai, Weikai Xu, Shaohua Hong, Lin Wang
Summary: This paper proposes a non-coherent discrete W transform based index-keying M-ary differential chaos shift keying (DWT-IK-MDCSK) system to address the high PAPR and high-data-rate transmission demands. The system utilizes multiple chaotic signals and their Hilbert transforms to convey information-bearing signals, extended by index-keying discrete W vectors for improved data rate. Analytical BER expressions over AWGN and Rayleigh fading channels are provided, with simulation results demonstrating lower PAPR and better BER performance compared to competitors.
IEEE COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Xiangming Cai, Weikai Xu, Lin Wang, Guanrong Chen
Summary: This paper proposes a JTFIM-MM-DCSK system for high-data-rate noncoherent chaotic communication, achieving higher data rates through joint time-frequency index modulation and taking full advantage of all subcarriers and time slots for information bit transmission using multiple-mode signal design. The BER performance of the system is verified through computer simulations.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Telecommunications
Xiangming Cai, Weikai Xu, Lin Wang, Guanrong Chen
Summary: This letter proposes a JPCM-DCSK scheme that addresses the problem of unreliable data transmission in the PLC channel. By integrating position and constellation mapping, JPCM-DCSK is able to transmit more information bits. Experimental results show that JPCM-DCSK outperforms its competitors in terms of BER performance.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xiangming Cai, Weikai Xu, Lin Wang, Geza Kolumban
Summary: This study proposes a Noise Suppression aided Multi-Carrier M-ary Differential Chaos Shift Keying (NS-MC-MDCSK) system that utilizes orthogonal Walsh codes to improve energy efficiency. A noise suppression algorithm is proposed to reduce channel noise and improve the Bit Error Rate (BER) performance. The NS-MC-MDCSK system outperforms other chaotic communication systems.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Xiangming Cai, Weikai Xu, Shaohua Hong, Lin Wang, Lin Zhang
Summary: This paper proposes a general carrier index assisted dual-mode differential chaos shift keying with full mapping system, which achieves higher data rate and spectral efficiency by designing distinguishable signals and using effective mapping. A noise decontamination method is also designed to enhance system performance. Simulation results demonstrate excellent bit error rate performance.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Xiang-Ming Cai, Jian Shan, Yun-Lin Le, Yuan Luo, Ya-Dong Li
Summary: This study utilizes the BP neural network and environmental parameters for rapid calculation of radon progeny concentration, meeting uncertainty requirements and achieving rapid measurement in engineering applications.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Telecommunications
Xiangming Cai, Weikai Xu, Lin Wang
Summary: This paper proposes an effective divide-and-conquer noise decontamination strategy to enhance the robustness of M-ary differential chaos shift keying (M-ary DCSK) systems. The strategy utilizes a discrete Hartley transform to improve the transmission efficiency and performance. Computer simulations demonstrate the significant improvement in bit error rate (BER) achieved by the proposed strategy.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xiangming Cai, Weikai Xu, Lin Wang, Georges Kaddoum
Summary: This paper presents a joint energy and correlation detection aided orthogonal frequency division multiplexing differential chaos shift keying (JECD-OFDM-DCSK) system. The system superimposes the reference and information-bearing signals in the same time slot to address the phase offset issue. JECD-OFDM-DCSK improves the data rate and reduces energy consumption by activating only some subcarriers and transmitting additional information bits using their indices. The system is analyzed and compared to other systems in terms of energy efficiency, peak to average power ratio (PAPR), and system complexity. Simulation results demonstrate that JECD-OFDM-DCSK outperforms other OFDM-based DCSK systems in terms of bit error rate (BER) performance.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Telecommunications
Xiangming Cai, Chongwen Huang, Jiancheng An, Weikai Xu, Lin Wang, Chau Yuen
Summary: In non-coherent chaotic communications, the traditional DCSK schemes have limited gains in BER performance. To overcome this issue, we propose a new RIS-aided DCSK scheme that enhances the SNR and improves BER performance by deploying an RIS close to the transmitter antenna. We analyze the BER performance of the proposed scheme and introduce two performance-enhanced algorithms with increased computational complexity to further improve BER performance.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Xiangming Cai, Deqing Wang, Weikai Xu, Lin Wang, Francis C. M. Lau
Summary: A spectral and energy-efficient CIK-MDCCSK system is proposed for D2D communications, which utilizes subcarriers for transmitting multiple cyclic shifted M-ary information-bearing signals and additional keying bits. The system also introduces a carrier keying detection and M-ary de-mapping algorithm to recover the transmitted information bits. The performance of the proposed system is evaluated in terms of BER, spectral efficiency, energy efficiency, and complexity, showing its superiority over benchmark systems. An enhanced version of the CIK-MDCCSK system is proposed, which achieves higher energy efficiency and improved BER performance compared to state-of-the-art benchmarks.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Xiangming Cai, Chau Yuen, Chongwen Huang, Weikai Xu, Lin Wang
Summary: A chaotic secure communication system using chaotic waveforms as spreading carriers is proposed. It can hide transmitted information by disguising it as noise over a wide frequency range. The system utilizes a reconfigurable intelligent surface (RIS) to assist communication and block interleaving patterns to enhance security. The proposed system is shown to have superior bit error rate (BER) and security performance compared to benchmark systems through theoretical analysis and Monte Carlo simulations.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Cai Xiangming, Xu Weikai, Wang Lin
Summary: This paper provides a detailed survey on the main research progresses in signal design of differential chaotic communications, including design of signal frames, design of orthogonal multilevel signals, design of constellation diagrams and design of multicarrier signals. Additionally, the research works on noise suppression aided performance optimization, index modulation aided performance optimization and chaotic shape forming aided performance optimization for differential chaotic communications are summarized.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Xiangming Cai, Luyao Hu, Weikai Xu, Lin Wang
Summary: This paper proposes a low-complexity underwater acoustic communication system based on differential cyclic-shifted differential chaos shift keying, which achieves high data rate, superior robustness, and enhanced system security without the need for channel state information. Simulation results show that the proposed system outperforms competitors in terms of bit error rate performance and system security.
2021 26TH IEEE ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS {APCC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Xiangming Cai, Weikai Xu, Shaohua Hong, Lin Wang
Summary: A spectrum-efficient M-ary CDSK scheme is proposed in this paper, which can improve system security by embedding the reference signal into the M-ary information-bearing signal and achieve better spectral efficiency through M-ary modulation. Simulation results show that the M-ary CDSK scheme outperforms other schemes by 1 to 4dB and provides a reliable solution for non-coherent chaotic communications.
2021 15TH INTERNATIONAL SYMPOSIUM ON MEDICAL INFORMATION AND COMMUNICATION TECHNOLOGY (ISMICT)
(2021)
