Yingsong Li

• Doctor of Philosophy
• Professor (Full) at Anhui University

In recent decades, few-shot object detection in SAR imagery has gained prominence as a major research focus. The unique imaging mechanism of SAR causes the model to suffer from foreground–background imbalance and inaccurate extraction of class prototypes for novel class instances. Therefore, we propose an innovative few-shot object detection algori...

We investigate the performance of an active reconfigurable intelligent surface (RIS)-assisted mixed radio frequency (RF)-terahertz (THz) relaying system, where the RF signal reaches the relay through the active RIS and is then transmitted to the user via the THz channel. Under this scenario, we analyze the system performance with the relay employin...

In this letter, a low-profile, high-aperture-efficiency millimeter-wave magneto-electric dipole (MED) circularly polarized (CP) beam-scanning antenna array is proposed. Initially, a novel MED antenna element is designed by arranging metallized vias around the radiating patches to serve as beam directors. This novel method not only provides broad ax...

An $\alpha$ -sigmoid affine-projection ( $\alpha$ SAP) algorithm is proposed based on an improved $\alpha$ -sigmoid cost function. The algorithm optimizes the sigmoid function by introducing the $\alpha$ parameter and combines it with the $L_{2}$ constraint, which accelerates the convergence speed when color signals are input to the system, and enh...

This study introduces a novel, unified arbitrary-order matrix exponential-symplectic FDTD<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">( p , q )</sup> (ME-SFDTD<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">( p , q )</sup>) method tailored for simulatin...

In this letter, a broadband solar cell differential printed antenna and its integrated design with active circuits are proposed. This antenna has a differential mode (DM) S_d <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> less than −10 dB in 1.4 GHz to 6.1 GHz. Furthermore, a 1 ×...

A unified dispersive media and perfect matching layer (PML) finite-difference time-domain (FDTD) formulation based on the matrix exponential (ME) method is proposed for the simulation of dispersive media characterized by first-order lossy Debye (LD) model. The method introduces the dispersive model into the FDTD algorithm and converts the update eq...

A new decoupling scheme named three-port coupled resonator decoupling network (CRDN) is proposed. The matching and decoupling conditions for the three coupled antennas are proposed, and the decoupling condition for the real part of the mutual admittances between three coupled antennas is derived. More importantly, a comprehensive synthesis theory f...

This letter proposes a circularly polarized (CP) filtering antenna with wide axial ratio (AR) bandwidth generated through a multi-layer structural design. The proposed antenna provides a wide AR bandwidth and reaches filtering performance without additional filtering networks. The antenna consists of a top patch, a square patch with a corner-trunca...

In this letter, a sub-6 GHz and millimeter-wave (mm-wave) dual-band aperture-shared phone MIMO antenna is presented for 5G/6G applications. A MIMO slot antenna in the frame of the phone is adopted for the sub-6 GHz band applications. A wideband ring Yagi antenna with the smaller ring director in the slot antenna is proposed for mm-wave band. To enh...

In this letter, a broadband compact dual-polarized solar cell phased array antenna is proposed. The proposed dual-polarized dipoles are arranged in a “T” shape, which not only makes the antenna compact and easy to fabricate, but also expands the working bandwidth by utilizing the coupling between the tightly arranged dipoles. Moreover, metal split-...

Reconfigurable intelligent surfaces (RIS) can actively perform beamforming and have become a crucial enabler for wireless systems in the future. The direction-of-arrival (DOA) estimates of RIS received signals can help design the reflection control matrix and improve communication quality. In this paper, we design a RIS-assisted system and propose...

In this article, we present an efficient transient electromagnetic–thermal co-simulation solver based on the hybrid implicit–explicit finite-difference time-domain (HIE-FDTD) method. This solver is designed to model the multiscale structure and multiphysics field effects of 3-D microwave integrated circuits (ICs). For the first time, we introduce t...

Accurate packing ratios are indispensable for the faster-than-Nyquist (FTN) signaling; therefore, we propose two robust semi-blind packing ratio estimation algorithms in this letter. Concretely, we construct a pilot-based FTN transmission scheme over the channel with frequency offset and phase noise. We conduct correlation operations on downsampled...

This letter establishes an equivalent circuit model of the waveguide slot solar cell phased array antenna and the loss mechanism of its realized gain is successfully revealed. To validate the accuracy and validity of the equivalent circuit, a solar cell waveguide slot phased array antenna was designed. The fitted radiation efficiency curve by the e...

As a promising technique to eliminate the intersymbol interference (ISI) caused by the faster-than-Nyquist (FTN) signaling, the G-to-minus-half (GTMH) precoding could result in severe spectrum broadening and reduce the spectrum efficiency. Combining the baseband shaping filter with the precoding matrix, we define the transfer function of the FTN si...

This paper proposes a novel tracker of adaptive directional ridge separation and prediction for detecting whistles from the calls of marine mammals, which are typically analyzed using a time-frequency (TF) representation. Inspired TF reassignment, a new reassignment based on time-scale changes is developed to acquire instantaneous TF points with hi...

Pedestrian trajectory prediction is extremely challenging due to the complex social attributes of pedestrians. Introducing latent vectors to model trajectory multimodality has become the latest mainstream solution idea. However, previous approaches have overlooked the effects of redundancy that arise from the introduction of latent vectors. Additio...

This paper proposes a programmable solar‐powered radio frequency (RF) transmitter. It employs a novel five‐layer structure that effectively integrates solar cells, active circuits, and broadband antenna. This design can directly emit RF signals without the need for additional power supply, enabling efficient energy conversion and transmission. In a...

In this study, a high-isolation and high-gain multiple-input multiple-output (MIMO) antenna array operating at 77 GHz is proposed. It consists of two columns of transmitting (TX) sawtooth linear antenna arrays and two rows of receiving (RX) sawtooth linear antenna arrays with a rectangle ring layout. Each TX and RX linear antenna array contains 12...

SAR target detectors based on deep learning have difficulty finding a good balance between accuracy and speed. Current pruning methods are usually used for backbone consistent pruning, and seldom directly for the whole structure of deep learning target detectors. Therefore, for edge-end applications, this paper proposes a new full-link general auto...

Reconfigurable intelligent surfaces (RIS) can actively perform beamforming and have become a crucial enabler for the wireless systems in the future. The direction-of-arrival (DOA) estimates of RIS received signals can help design the reflection control matrix and improve communication quality. In this paper, we design a RIS-assisted system and prop...

In wireless communications and vehicle communications, it is useful to use adaptive filtering techniques for channel estimation, beamforming and echo cancellation. In this paper, we propose a general constrained adaptive filtering (GCAF) algorithm for single channel estimation and beamforming, which is obtained by integrating a general and adaptive...

In this paper, a machine-learning-assisted antenna array isolation optimization method for bistatic in-band full-duplex (IBFD) communication systems based on a novel intelligent surface (IS) is proposed. Both miniaturization and independent dual-polarized transmission phase reconfigurability features are realized simultaneously in this IS. As an il...

This paper presents a three-step direction-of-arrival (DOA) estimation method aimed at addressing impulsive noise and array gain-phase errors. Initially, a robustness function combining the logarithmic function with least-squares is introduced to address impulsive noise. This robust function is utilized to formulate a low-rank matrix approximation...

3D printing technology is applied to the processing and manufacturing of antennas because it can improve the freedom of antenna design and fabricate antennas that are difficult to achieve with conventional processes. In this paper, a compact bamboo dragonfly-liked circularly polarized antenna is designed using 3D printing technology. The antenna co...

A multifunctional transmission line (TL) based on spoof surface plasmon polaritons (SSPPs) is proposed for dynamical switching features among bandpass, band‐stop, and dual‐band phase shifting functionalities. Different operating modes can be controlled in real‐time by changing the states of the Positive Intrinsic Negative (PIN) diodes synchronously...

This letter considered the passive sensing problem and proposed a new direction-of-arrival (DOA) estimation algorithm with joint squared-sine function (SS) and atomic norm minimization (ANM), called SS-ANM. For a reconfigurable intelligent surface (RIS) assisted passive sensing system, the SS and atomic norm (AN) are utilized to construct the optim...

In this study, a 77 GHz phased array antenna based on substrate integrated waveguide (SIW) is proposed. The proposed phased array antenna includes two columns of transmitting (TX) linear antenna arrays and two rows of receiving (RX) linear antenna arrays, which form a rectangular ring distribution. These TX and RX antennas are vertically polarized...

A wideband differentially fed circularly polarized (CP) antenna featuring a slotted patch design with a large beamwidth is presented. The final design of the differentially fed CP antenna, aimed at achieving high gain and a wide axial ratio (AR) bandwidth, involves coupling a differential bending dipole antenna to the slotted patch in the same plan...

To address the significant performance degradation of conventional underdetermined blind source separation algorithms for frequency-hopping (FH) signals under time-frequency (TF) overlapping conditions, this paper presents a novel three-stage scheme based on the TF distribution of FH signals. In the first stage, key parameters of the FH signal are...

A novel circularly polarized (CP) Yagi-Uda antenna based on element-rotation is proposed in this communication. At first, the two-potential integral equations are adopted to analyze the three-element-rotation CP Yagi-Uda antenna, which is composed of a driven, a reflector and director elements with certain rotation axial angles. Then, according to...

The numerical superiority of the unconditionally stable fundamental locally one-dimensional finite-difference time-domain (FLOD-FDTD) method has been proved in some studies. In this paper, the FLOD-FDTD method is extended to simulate general dispersive media in combination with the auxiliary differential equation (ADE) scheme with formulation based...

To address the low spectrum efficiency of satellite communications, faster-than-Nyquist (FTN) signaling has proven a promising technology to improve the spectrum efficiency without requiring additional bandwidth or antennas. However, FTN signaling violates the Nyquist criterion, thereby resulting in inter-symbol interference (ISI). While existing s...

Existing direction of arrival (DOA) estimation approaches are often only considering Gaussian noise or impulsive noise, leading to the performance degradation in the scenario that both noises exist simultaneously. Considering that ambient noise of underwater acoustic array may have different variances due to the large aperture, this paper proposes...

In this article, a novel ultra-wideband circularly polarized (CP) orthogonal magnetic dipole (OMD) antenna array with a dual-mode sequential rotation feeding (SRF) networks is proposed for the millimeter-wave (mm-wave) applications. Above all, a novel OMD concept model is proposed. Subsequently, based on the conceptual model, a planar CP OMD antenn...

A low sidelobe 77 GHz centre‐fed microstrip patch array antenna is proposed for automotive radar application. The proposed antenna comprises eight linear antenna arrays, each of which is centre‐fed by a coplanar waveguide with ground transmission line at the back of the microstrip patches. Each linear antenna array contains 10 patch antenna units,...

In this brief, an ultra-broadband rectifier with expanded dynamic input power range (IPR) for both wireless power transfer (WPT) and radio frequency energy-harvesting (RFEH) is proposed and analyzed. Expanded dynamic IPR and broadband impedance matching are realized by utilizing a microstrip transmission line impedance compression circuit (MTLICC)...

p> A unified affine-projection-like adaptive (UAPLA) algorithm is deivised and verified for system identification. The UAPLA algorithm uses a generalized cost function encompassing some data-reusing methods to cope with colored input signals. Furthermore, the UAPLA algorithm is derived based on the new cost function to generalize multiple affine-pr...

p>A General Constrained Adaptive Filtering (GCAF) algorithm is proposed via constructing a general and adaptive loss function to find out a solution of constraint optimizing problem. By selecting appropriate parameters, the GCAF algorithm can be utilized to approximate different adaptive algorithms and has higher performance than its approximated a...

p>A General Constrained Adaptive Filtering (GCAF) algorithm is proposed via constructing a general and adaptive loss function to find out a solution of constraint optimizing problem. By selecting appropriate parameters, the GCAF algorithm can be utilized to approximate different adaptive algorithms and has higher performance than its approximated a...

p>To address the significant performance degradation of conventional underdetermined blind source separation algorithms for frequency-hopping (FH) signals under time-frequency (TF) overlapping conditions, this paper presents a novel three-stage scheme based on the TF distribution of FH signals. In the first stage, key parameters of the FH signal ar...

p>To address the significant performance degradation of conventional underdetermined blind source separation algorithms for frequency-hopping (FH) signals under time-frequency (TF) overlapping conditions, this paper presents a novel three-stage scheme based on the TF distribution of FH signals. In the first stage, key parameters of the FH signal ar...

p> A unified affine-projection-like adaptive (UAPLA) algorithm is deivised and verified for system identification. The UAPLA algorithm uses a generalized cost function encompassing some data-reusing methods to cope with colored input signals. Furthermore, the UAPLA algorithm is derived based on the new cost function to generalize multiple affine-pr...

To improve the accuracy of modulated signal recognition in variable environments and reduce the impact of factors such as lack of prior knowledge on recognition results, researchers have gradually adopted deep learning techniques to replace traditional modulated signal processing techniques. To address the problem of low recognition accuracy of the...

Dielectric resonator magnetoelectric dipole (DRMED) arrays with enhanced isolation, reduced cross-polarization, and backward radiation are proposed for base station (BS) applications. The proposed antenna comprises an elevated dielectric res-onator antenna (DRA) on a small metal plate above a sizeable common ground plane. The DRA is designed in its...