Article
Engineering, Electrical & Electronic
Zhan Zhang, Ping Wei, Huaguo Zhang, Lijuan Deng
Summary: This paper addresses the problem of joint spectrum sensing and DOA estimation under array receiver based on MWC and sub-Nyquist sampling. Two algorithms are proposed to improve estimation robustness by utilizing Fourier series coefficients for frequency estimation. The proposed approaches contribute to robust DOA estimation under high noise level.
Article
Engineering, Electrical & Electronic
Wenxu Zhang, Xinlei Cui, Zhongkai Zhao, Xiaoqi Zhao
Summary: This research proposes an improved multi-coset sampling method that preserves the phase information between sampling channels through channel delay and achieves unambiguous frequency estimation after digital channelization. The method significantly improves the time interval and array aperture between sampling channels, benefiting estimation accuracy and clock synchronization.
IEEE SIGNAL PROCESSING LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Heng Liu, Huiping Duan
Summary: This paper proposes an I-Q MCS architecture and a corresponding timing skew calibration approach for sub-Nyquist sampling. Experimental results demonstrate that the proposed method is capable of reconstructing the spectrum with desirable performance even under significant timing skews. Robust spectrum sensing is achieved at sub-Nyquist rates.
DIGITAL SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Jiahui Cao, Zhibo Yang, Shaohua Tian, Xuefeng Chen
Summary: Rotating blades in turbomachinery play a functional role, but they are prone to failure due to harsh working conditions. Blade tip timing (BTT) is a potential technique for blade health monitoring, but the nonuniform and undersampling characteristics of the BTT signal challenge signal processing.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Computer Science, Information Systems
Xiqian Luo, Zhaoyang Zhang
Summary: The paper investigates the recovery of data from sub-Nyquist sample sequences of a linearly modulated baseband signal, exploring the performance limits and recovery algorithms of two different sampling schemes. It presents a modified time-variant Viterbi algorithm for efficient data recovery from sub-Nyquist samples under the constraint of a finite alphabet set of transmitted symbols. The simulated bit error rates of different sub-Nyquist sampling schemes are compared with theoretical limits and Nyquist sampling counterparts, demonstrating the excellent performance of the proposed data recovery algorithm.
FRONTIERS OF INFORMATION TECHNOLOGY & ELECTRONIC ENGINEERING
(2021)
Article
Environmental Sciences
Ying-Xi Liu, Qun Zhang, Shi-Chao Xiong, Hao-Bo Wang, Hang Yuan, Ying Luo
Summary: This paper proposes a jamming method based on sub-Nyquist sampling to generate multiple false targets with different shapes on ISAR images, aiming to achieve better deception effects.
Article
Engineering, Electrical & Electronic
Ghasem Sobhani, Amir Mansour Pezeshk, Fereidoon Behnia, Mohammad Sadeghi
Summary: The main task of a reconnaissance receiver is to acquire wide-band radio signals and extract important parameters, such as Direction of Arrival (DOA) and carrier frequency. The study utilizes sub-Nyquist sampling and phase interferometry to efficiently extract internal information of the signals.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Guoxing Huang, An Ni, Weidang Lu, Hong Peng, Jingwen Wang
Summary: The paper proposes a sub-Nyquist sampling and parameters estimation scheme for measuring MEDS signal parameters, enabling the measurement of parameters of K components MEDS signals from as few as 3K samples, and applicable to scenarios with unknown K. Simulation and experimental results demonstrate the effectiveness and noise robustness of the proposed scheme.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Engineering, Electrical & Electronic
Siyi Jiang, Ning Fu, Zhiliang Wei, Liyan Qiao, Xiyuan Peng
Summary: In this article, a novel sub-Nyquist spectrum sensing and DOA estimation method based on the space-time trilinear model is proposed to improve the performance and also solve the rank deficiency problem in the presence of coherent signals. It avoids the computation of correlation matrices or signal subspaces, making the estimation independent of the nonideal statistical properties of finite snapshots. The effectiveness of the proposed method is verified by simulation and hardware experiments.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Computer Science, Information Systems
Jilin Wang, Qing Li, Huiping Duan, Jun Fang, Zhi Ren, Hongbin Li
Summary: The problem of wideband spectrum sensing was addressed, proposing a new sub-Nyquist sampling architecture and compressed power spectrum estimation method. Analysis showed a significant sampling rate reduction without sparse constraint on the monitored frequency band, with simulation results demonstrating the effectiveness of the proposed method.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Guoxing Huang, Shiming Zhang, Linlin Chen, Huimei Han, Weidang Lu
Summary: This paper proposes a two-channel sub-Nyquist sampling system for pulse streams, which allows for recovery of arbitrary pulses with different frequency spectrums, greatly improving the flexibility and reconstruction performance of the system.
DIGITAL SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Guoxing Huang, Yunfei Xiang, Shibiao Deng, Yu Zhang, Jingwen Wang
Summary: This paper proposes a dual-channel cooperative sub-Nyquist sampling system for LFM-BPSK hybrid modulated signal. The system can solve the frequency ambiguity problem caused by low sampling rate and estimate the phases of binary symbols and the positions of discontinuities through self-mixing technology.
DIGITAL SIGNAL PROCESSING
(2024)
Article
Computer Science, Theory & Methods
Xiangdong Huang, Xuecheng Zhao, Wei Lu
Summary: In this paper, a sub-Nyquist receiver architecture with two perpendicular unfolded coprime arrays (UCPAs) is proposed for efficient joint frequency and DOA estimation. The proposed architecture has a large aperture, and the frequency and DOA can be analytically estimated by performing root-MUSIC on the collected sub-Nyquist samples. Additionally, a beamforming based correlation matching method is developed to solve the pairing problem among multiple targets, facilitating the spectrum recovery of individual sources.
MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Hong-Cai Xin, Bing-Zhao Li, Xia Bai
Summary: The paper introduces a novel sub-Nyquist FRI-based sampling and reconstruction method in the LCT domain, which utilizes a compact-support sampling kernel and annihilating filter to achieve superior reconstruction performance and reconstruction ability in noisy environments. The method can also be applied to time delay estimation and obtain super-resolution results.
CIRCUITS SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Guoxing Huang, Shibiao Deng, An Ni, Yu Zhang, Weidang Lu, Jingwen Wang
Summary: Parameters measurement of multiple exponentially damped sinusoids (MEDS) signals is of great significance in many areas. In this paper, a distributed sub-Nyquist sampling and parameters measurement method is proposed for common frequency support MEDS signals. The effectiveness and noise robustness of the proposed method are demonstrated through simulation and hardware experiments.
DIGITAL SIGNAL PROCESSING
(2023)