Xue Wei

Harbin Engineering University · College of Information and Communication Engineering

The optimized Nyquist pulse is used as a baseband signal of spectrally efficient frequency division multiplexing (SEFDM) system, where subcarriers use cyclic forms of the Nyquist pulse to reduce their mutual correlation, the probability of in-phase occurrence between them, and reduce the probability of the SEFDM signal peak. To reduce the subcarrie...

This brief proposed a constrained $q$ -Rényi kernel functioned (CqRKF) adaptive algorithm, which used new cost function created by $q$ -Rényi kernel function within the solution of constrained adaptive algorithms. The proposed CqRKF is implemented via solving a constrained optimization problem to provide superior performance against non-Gaussia...

The method of transmitting signals above the Nyquist limit seems to be promising in terms of increasing bandwidth efficiency, but its practical application is limited by the complexity of the implementation of receiver devices, which should apply complex detection algorithms to eliminate the negative effect of intersymbol interference in the signal...

The electric inversion technique reconstructs the subsurface medium distribution from acquired data. On the basis of electric inversion, objects buried under the earth or seabed, such as pipelines and unexploded ordnance, are detected and located in a contactless manner. However, the process of accurately reconstructing the shape of the target obje...

The Orthogonal Frequency Division Multiplexing (OFDM) systems use rectangular pulse as baseband signal, and a main problem of the rectangular pulse is that its main lobe energy concentration is low and the out-of-band emissions (OOBE) is too high. The filtered orthogonal frequency division multiplexing (F-OFDM) system can make the F-OFDM system hav...

Most current target detection algorithms have problems such as high computational complexity and poor adaptability, which are difficult to meet actual application requirements and are deployed on mobile embedded platform devices. Towards solving the above problems, in this paper, we propose an improved Mobilenetv3-Yolov5 infrared target detection a...

In this letter, a design method of a prototype filter for effectively suppressing out-of-band radiation (OOBR) in generalized frequency division multiplexing (GFDM) systems is proposed. A generic model that can suppress out-of-band energy leakage in the frequency-domain is introduced. The function that is solved in this model gives the target proto...

This paper introduces the kernel least lncosh (KLL) algorithm, in which the lncosh (logarithm of hyperbolic cosine) cost function is successfully applied in the reproducing-kernel-Hilbert space. The online vector quantization (VQ) is then used to quantize the input space to construct the algorithm which can curb the growth of network size. As a res...

In this paper, we proposed a novel online kernel-adaptive learning algorithm under the reproducing-kernel-Hilbert space (RKHS), which is called kernel q-Rényi (KqR) algorithm. The KqR algorithm is derived via constructing a q-Rényi kernel function as a cost function into kernel adaptive filtering algorithm (KAF). The vector-quantization (VQ) method...

The Filtered-OFDM (F-OFDM) systems use filters to filter signals in the time-domain to achieve rapid attenuation of side-lobes and reduces mutual interference caused by multi-scene access. In general, signal filtering in the F-OFDM system is obtained by using the classical window functions to truncate the sinc function. In this paper, based on the...

The increase in the throughput of digital television and radio broadcasting (DVB) channels can be achieved due to application of signals with a compact spectrum and a relatively small peak-to-average power ratio (PAPR). The reason is the usage of traveling wave tubes (TWT) for amplifying and transmitting signals from a satellite repeater in DVB-S2X...

We propose a constrained least lncosh (CLL) adaptive filtering algorithm, which, as we show, provides better performance than other algorithms in impulsive noise environment. The proposed CLL algorithm is derived via incorporating a lncosh function in a constrained optimization problem under non-Gaussian noise environment. The lncosh cost function...

We propose a recursive constrained least lncosh (RCLL) adaptive algorithm to combat the impulsive noises. In general, the lncosh function is used to develop a new algorithm within the context of constrained adaptive filtering via solving a linear constrained optimization problem, where the lncosh function is a natural logarithm of hyperbolic cosine...

This paper presents the study of 5G coding schemes application to Faster than Nyquist transmission with optimal signals. Comparison of LDPC and Polar coding performance with optimal FTN signals is given. BER performance analysis for different transmission rates is provided. It is shown that LDPC coding scheme is more preferable in particular cases...

The achievement of the boundary values of spectral efficiency is associated with the development of methods for generating and receiving signals with a compact spectrum. The reason is a constant increase in the capacity of existing communication channels caused by an increase in the volume of transmitted information. Moreover, the allocated frequen...

In this paper, we propose an improved three-dimensional underwater electric field-based target localization method. This method combines the subspace scanning algorithm and the meta evolutionary programming (meta-EP) particle swarm optimization (PSO) algorithm. The subspace scanning algorithm is applied as the evaluation function of the electric fi...

Electrical impedance tomography (EIT), geophysics and undersea target reconstruction are typical non-linear ill-posed inverse problems, and in many cases, the anomalous bodies feature with a clear boundary. Thus, it is suitable to obtain sharp boundaries and blocky features with the Total Variation (TV) functional regularization. However, the TV fu...

In this study, the principle of minimum spectral energy leakage is applied, and the mathematical model is also established by the general function through adding different constraints. To allow the target baseband signal to have a high-quality time-domain representation, it is assumed that the baseband signal is an even function. The time-domain wa...

In this paper, the optimal mathematical generic function model is established using the minimum out-of-band energy radiation criterion. Firstly, the energy limit conditions, boundary constraints, and peak-to-average ratio constraints are applied to the generic function model; thus, the analytical solutions are obtained under different parameters. S...

In this paper, a novel inversion method is proposed to recover the sharp boundary of blocky targets buried beneath the seabed with conductivities different from that of the background environment. This method is implemented by combining the Laplacian-of-Gaussian (LoG) function with minimum gradient support (MGS) regularization. A two-stage inversio...

This paper establishes an optimal generic function model in order to obtain a continuous phase modulated (CPM) signal with a smoother phase modulation function. This is achieved by finding the solution to the symbol signals at different lengths of the CPM function. In the solution process, the unknown amount that needs to be solved is reduced by us...

This article proposes a novel active localization method based on the mixed polarization multiple signal classification (MP-MUSIC) algorithm for positioning a metal target or an insulator target in the underwater environment by using a uniform circular antenna (UCA). The boundary element method (BEM) is introduced to analyze the boundary of the tar...

This article proposes a novel active localization method based on mixed polarization multiple signal classification (MP-MUSIC) algorithm for positioning a metal target or an insulator target in underwater environment by using uniform circular antenna (UCA). The boundary element ! method (BEM) is introduced to analyze the boundary of the target by u...

This paper presents a novel method designing an optimized waveform with high spectral efficiency based on minimum out-of-band radiation criterion. Introducing the Pan-function model, Fourier series, and constraints, we achieve the numeric solution of the optimized baseband signals. The optimal waveform provides an excellent bandwidth efficiency, an...

A novel localization method based on multiple signal classification (MUSIC) algorithm is proposed for positioning an electric dipole source in confined underwater environment by using electric dipole receiving antenna array. In this method, the boundary element method (BEM) is introduced to analyze the boundary of the confined region by use of a ma...

This paper introduces the design and implementation of the underwater wireless electromagnetic communication system based on the current field theory. The system realizes the wireless transmission of underwater voice signal, and has a good application prospect in underwater short-range wireless communication.

In this paper, a novel method based on the Poggio–Miller–Chang-Harrington–Wu–Tsai (PMCHWT) integral equation is presented to study the electromagnetic fields excited by vertical or horizontal electric dipoles in the presence of a layered region which consists of K-layered dissipative media and the air above. To transform the continuous integral equ...

In 2-year-old Chinese giant salamanders Andrias davidianus, occasional electric discharges with a characteristic pattern similar to the electric discharges of weakly electric catfish, Polypterus and Protopterus, were recorded for the first time. The discharges markedly differ in shape from the myograms accompanying abrupt movements of the salamande...

An ultrathin-channel trench single gate tunnelling field-effect transistor (trench SG-TFET) with a 5 nm channel thickness is proposed and investigated. Trench SG-TFETs demonstrate a higher ION (∼8 times), a steeper sub-threshold swing (SS) (average SS of 46.2 mV/decade and point SS of 21.8 mV/decade), and a higher ION/IOFF current ratio (∼10 times)...

An optimal electric dipole antennas model is presented and analyzed, based on the hemispherical grounding equivalent model and the superposition principle. The paper also presents a full-wave electromagnetic simulation for the electromagnetic field propagation in layered conducting medium, which is excited by the horizontal electric dipole antennas...

The continuous phase modulation (CPM) signal has the characteristics of continuous phase, excellent spectral properties, less out-band radiation, and constant envelope. Thus, CPM technology is widely used in communication systems. The shape of frequency pulse can influence the bandwidth occupancy of CPM, and smoother phase trajectories are obtained...

In this work, we propose and simulate an asymmetric dual-gate tunneling FET (ADG-TFET) combining a tunneling field effect transistor (TFET) with a junctionless field effect transistor (JLFET). The current is controlled by an in the bottom channel potential barrier as well as the reverse-biased P+ pocket-Intrinsic region (p-i) tunnel junction bandga...

A problem of reducing frequency bandwidth in case of multi-frequency signals is considered. The main conditions are the minimization of additional energy losses while maintaining the information rate. Frequency bandwidth reduction is carried out by means of doubling the duration of the signals used for each subcarrier frequency. The envelope signal...

In this paper, we analyzed the baseband symbol distortion and spectrum spreading caused by the limiter in a quadrature modulation system. The baseband symbol distortion and spectrum spreading was analyzed by introducing limiter under no intersymbol interference condition. In order to improve the system bandwidth efficiency and not reduce the inform...

Aiming at the digital quadrature modulation system, a mathematical Pan-function model of the optimized baseband symbol signals with a symbol length of 4T was established in accordance with the minimum out-band energy radiation criterion. The intersymbol interference (ISI), symbol-correlated characteristics, and attenuation factor were introduced to...

Junction barrier Schottky (JBS) rectifier with mixed trench structure on 4H-SiC for improving the electrical performance is proposed. The device shows the increasing forward current density compared to the common JBS rectifier on 4H-SiC because of the larger Schottky contact area without considerable degradation of breakdown voltage. This work is s...

This paper presents 2-D numerical simulation results of single-event burnout (SEB) for hardened power U-shaped gate MOSFET (UMOSFET) with Schottky diode (SD-UMOSFET). In this device, a Schottky diode is integrated into every unit cell of power UMOSFETs. We find that the Schottky contact can leak off the generated holes caused by an ion's impact, an...

Conduction current field communication technology is a radio-communication mode, which penetrates the formation by means of radio waves, and uses the layered earth as electromagnetic wave propagation medium. On the propagation in crust, traditional wireless communication mode has the disadvantages of the serious signal attenuation and the low anten...

In this paper, we conduct a detail analysis of a kind of base-band symbol distortion and spectrum-spreading caused by the limiter in the quadrature modulation system. The selected symbol is sin2(πt/4T). In order to improve the system bandwidth efficiency, we introduce the inter symbol interference, giving a method to analyze the base-band symbol di...

Continuous Phase Modulation Signal has the advantages of continuous phase, faster decay speed of power spectrum, constant envelope and so on, which is widely used in Communication Systems. The phase smoothing degree is one of main factors that affect the decay speed of CPM signal power spectrum. One method of smoothing CPM signal phase based on Ato...