Abstract：In order to meet the surging demand of mobile data traffic in the future, 5G communication system will adopt a more complex non-constant envelope modulation method, resulting in high peak-to-average power ratio(PAPR) of the transmitted signal, thus putting forward more stringent requirements on the performance of millimeter-wave radio frequency power amplifier(RFPA). The CMOS process combines the advantages of low cost and high integration, making it ideal for fully integrating 5G RF modules. This paper introduces and compares various techniques for improving the efficiency and linearity of power amplifiers(PAs), mainly expounds the research status of envelope tracking(ET) technology, and finally analyzes the development trend of power amplifiers in 5G applications.

Abstract：The Empirical Mode Decomposition(EMD) algorithm proposed by Huang is a data driven adaptive analysis method for nonlinear time-varying signals. The signals can be decomposed into a few Intrinsic Mode Functions(IMFs) components with physical meaning. However, Mode Mixing(MM) can lead to wrong or false components in time frequency distributions, and then cause the decomposed IMFs losing their physical meaning. This seriously affects the EMD accuracies and applications. This study reviews methods of the MM suppression in one-dimensional and multi-dimensional EMD algorithms. The results improvements and limitations in related researches are summarized. Finally, the future development trend of related researches and applications are discussed.

Abstract：With the rapid development of Internet applications and the rapid growth of users , the reviews and opinions of stock market largely reflect the quotation of the stock market,simultaneously it affects the ups and downs of the stock market. Therefore, how to quickly and efficiently analyze the attitudes and opinions of netizens to the stock market,which,this question plays important role in guiding us to predict the stock market. The thesis studies the rising and falling trend of stocks by analyzing the emotional polarity of different professional issuing stocks. This paper proposes a sentiment analysis method based on a dictionary of consistent integrated financial phrases and weighted at the end of paragraph, which can solve the dependency problem of sentiment dictionary on the domain，and it can effectively improve the accuracy of sentiment analysis. In addition, this paper also proposed a windowed stock prediction model, which can be used to analyze the optimal value of the forecast event window. The experimental results shows that it will be better to predict the rising or falling trend of a particular stock just based on the stock market sentiment analysis.

Abstract：In order to solve the problem of noise preprocessing in the process of image acquisition by complementary metal oxide semiconductor(CMOS) image sensor, a configurable adaptive weighted mean filter module in FPGA is proposed. This module determines the direction of the texture by detecting the variance of different directions in the filter window, thus automatically generating the corresponding weighting coefficients. The weighted mean filter can process image with a width of no more than 4 094 pixels, so as to achieve the goal of de-noising and preserving edges. Finally, the experiment shows that when the image width is 2 048, the delay is 42.04 μs, and it satisfies the real-time requirement. The image noise is obviously reduced. The texture edge burr is disappearing, and the image quality can be improved better after filtering.

Abstract：Based on the analysis of the structure and driving mechanism of the permanent magnet toroidal motor, the inductance of the motor was analyzed and calculated, the mathematical model was established. Based on the advantages of position sensorless control, the position sensorless control model based on model reference adaptive system(MRAS) applied for permanent magnet toroidal motor was designed, the simulation of control system was established. The simulation results show that the motor speed and the position angular of the planet carrier rotor error based on MRAS are small, the control system based on MRAS can estimate the planet carrier rotor angular speed accurately, and the control method is effective.

Abstract：A novel current detection circuit based on RC parallel inductor lossless current-sense technology is proposed to overcome the low efficiency of high current conversion in traditional series resistance detection.The circuit can accurately detect the instantaneous-current and average-current of inductive current at the same time and improve the detection efficiency. The main circuit consists of three parts: high precision and low speed current detection with correction, fast current detection and feedback calibration circuit. The first part detects the average value of the current, and the fast current detection circuit is calibrated by feedback calibration circuit to accurately detect the instantaneous value of the current. The problem of current reflux is solved by negative current generating circuit.The circuit is designed by TSMC 180 nm 1P3M GEN2 process and simulated by Cadence software.The results show that this method can obtain the the average and instantaneous value of the inductive current while ensuring the detection of inductive current.

Abstract：In order to realize the modeling and numerical simulation of the electromagnetic field distribution and wave propagation in interconnects of interposers for three-dimensional integration, the Finite Difference Time Domain(FDTD) method is used in this paper to reveal the propagation of two-dimensional TE(Transverse Electric) wave. Variations of the magnetic field at the boundary are compared when adding Mur and PML(Perfectly Matched Layer) absorbing boundary conditions respectively. The error curves and isophasal lines are plotted to validate the absorbing performance of these two boundary conditions. The results show that PML can be used as the absorbing boundary of a two-dimensional TE wave to ensure a more appropriate absorbing effect in engineering simulation.

Abstract：Large size and thick oxide transistors are usually used in the design of Low Dropout Linear Regulator(LDO) in order to increase the upper limited voltage of input supply voltage，but this will increase the area of the circuit. In order to solve this problem, this paper proposed a wide range voltage stabilizing circuit based on an improved Wilson current mirror structure, which provides power and bias for LDO. The simulation results show that the external supply voltage range from 3.5 V to 6 V can be converted to 1.8 V supply voltage, so that the LDO core circuit can still use 0.18 μm MOS transistors under the high input supply voltage, which can reduce the chip area. And it can bring convenience to the design of LDO analog module.

Abstract：Aiming at the problem that remote sensing image resolution continues to increase and transmission channel bandwidth limit, a high frame rate image coding device for FPGA-controlled dedicated JPEG2000 standard algorithm integrated circuit is proposed. The original image data is received through the LVDS interface, and then transmitted to the compression coding module after being pinged by the ping-pong, which also greatly increases the transmission rate. After actual testing, the device achieves high compression ratio requirements for high frame rate images, reduces the bandwidth requirements of the transmission channel, and is stable and reliable.

Abstract：Based on the idea of model design and development（MBD）, doubly fed induction generator grid simulation system which used power hardware in loop(PHIL) was designed. The turbine system was simulated by the up computer，speed acquisition card，frequency converter and asynchronous motor. The actual DFIG was controlled by back to back doubly PWM converter. The dual controller was applied to control the converter. The NI controller is used to execute PWM algorithm. The auxiliary controller uses TI-28335 DSP to execute a general control program.Their code can be generated by simulation model directly.The output control quantity can be selected according to the experimental requirements.The system can complete the study of a variety of complex working conditions and generate code from Simulink model to controller. So the system can realize complex control algorithm faster and improve the efficiency of scientific research and reduce the cost of testing.

Abstract：A general test turntable was designed and developed for the test of the bomb chamber, and in-depth research on the system oscillations and long system response time that occur during the test of different load processes are given. A fuzzy adaptive PID control method is proposed. Taking the error e and the error change rate ec as inputs, the fuzzy parameters are used to modify the PID parameters online to meet the requirements of e and ec for PID parameter self-tuning under different loads, which will eliminate the oscillations and increase the response speed of the system. Through system modeling and simulation, the control effects of common PID control and fuzzy adaptive PID control under different loads are compared. According to the simulation analysis, the fuzzy adaptive PID control can recognize the change of the load in time compared with the normal PID control, which will help to adjust the PID parameter of the system accordingly, so that the system maintains a certain response speed.

Abstract：In order to solve the problem of redundant time slot allocation for single node sectors, too large overhead and excessively long time spent for beamforming training under mobile scenarios in existing directional MAC protocols, this paper proposes high slot utilization rate and fast directional MAC protocol(HUFD-MAC) for Terahertz wireless personal area networks. The HUFD-MAC protocol uses redundant single node sectors to transmit downlink data and reduces the number of transmitted beam training frames based on time information. This effectively improves the utilization of time slots, reduces network overhead, and decreases the time required for beamforming. The simulation results show that compared with the IEEE 802.15.3c and ACAP-MAC protocols, the network overhead of HUFD-MAC is reduced by about 3.23%, and the MAC layer throughput is increased by about 8.50%.

Abstract：A novel printed ultra-wideband(UWB) slot antenna with reconfigurable band-notched characteristics for cognitive radio(CR) applications is presented. An improved rectangular monopole antenna is used as the basic model and a tangential rectangular floor is used to realize the ultra-wideband characteristics of 2.9～12 GHz. The band-notched function is achieved by etching one symmetric folded slot which consists of an inverted U-shaped slot and H-shaped slot on the modified rectangular radiation patch. By switching the pin-diodes to change the shape and effective length of the folded slot, the reconfigurable function is achieved. The antenna is compact and easy to process, and has potential application in CR system. Simulated and measured results obtained for the antenna show that it exhibits good radiation behavior and also has three reconfigurable frequency band-notched functions in the range of WiMAX(3.4～3.9 GHz), WLAN(4.6～6.0 GHz) and downlink of X-band satellite communication(6.5～8.2 GHz).

Abstract：Aiming at the complexity and system capacity of orthogonal frequency division multiplexing adaptive resource allocation, this paper proposes a joint subcarrier allocation and power allocation scheme. In the subcarrier allocation,the adjacent subcarriers in the frequency band are combined into subcarrier clusters. The user rate is proportionally restricted, and the subcarriers clusters is assigned to user according to a preset ratio. In the power allocation, the power is allocated to the user according to the ratio of the user rate after the subcarriers are allocated, and then the water injection algorithm is used to solve the problem of subcarrier allocation for single user. The simulation results show that the proposed scheme can not only effectively reduce the complexity of the algorithm, but also increase the system capacity, which proves the feasibility of the scheme.

Abstract：Due to the rapid development of small satellite technology，and the advantages of low earth orbit satellite(LEO) with low delay and low propagation loss as compared with the traditional geosynchronous orbit satellite(GEO), the broadband LEO constellation satellite communication system has gradually become one of the most important hot spots in the field of satellite communications. Many countries and satellite communication companies in the world are formulating the project of broadband satellite communication system. In view of the actual demand of China, in order to construct the broadband LEO constellation satellite communication system reasonably and effectively, and to research an efficient networking scheme, it is necessary to analyze traffic demand. This paper constructs the location-based traffic model and time-based traffic model. A method to simulate the traffic of broadband LEO constellation satellite communication system is proposed. And the traffic in one satellite and one orbit of the broadband LEO constellation satellite communication system were simulated respectively by using STK and MATLAB simulation software. It provides certain reference and guiding significance for constructing our country′s independent broad band LEO constellation satellite communication system.

Abstract：Device-to-device based vehicle-to-vehicle(D2D-based V2V) communication underlaying OFDMA cellular network can improve spectral efficiency and system throughput. However, frequency reuse interference will severely affect on the communication quality. To overcome this problem, this paper proposes a power allocation strategy with delay QoS guarantee for each D2D-based V2V user′s requirement. The strategy takes the interference of cellular user and D2D-based V2V user into account, and provides the effective capacity as the delay QoS guarantee. Moreover, the Lagrangian dual decomposition method is used to obtain the optimization power allocation. Numerical simulation results show that compared to other strategies, the proposed power allocation approach can significantly improve the system effective capacity.

Abstract：With the development of drones, three-dimensional reconstruction of UAV sequence images is receiving more and more attention. In order to make the captured sequence image completely reconstruct the 3D model of the mission area and the flight power consumption of the multi-rotor UAV is smaller, a multi-rotor UAV coverage path planning algorithm for image 3D reconstruction is proposed. For the convex polygon region, in order to meet the requirements of image overlap and time continuity, a multi-rotor UAV scanning route planning method based on the grating method is proposed and combined with the optimal scanning direction to minimize the number of turns. With the help of Gazebo simulation platform, it is verified that the power consumption of the multi-rotor UAV is smaller when the flight is obtained according to the algorithm of this paper, and the captured sequence image satisfies the requirements of the reconstruction task area three-dimensional model.

Abstract：The accuracy of intelligent vehicle positioning in the current market cannot satisfy customers′ needs. The positioning algorithm based on Ultra Wideband(UWB) was proposed in order to solve the problem. Two fixed anchors were placed on the intelligent positioning vehicle. The data of distance from the tag to the two anchors was caculated by Kalman filter algorithm. The trigonometric function was used to get the distance from the tag to the middle point of the two anchors and the offset angle. Then the distance and angle data were transmitted to the motor control module, which adjusted Pulse Width Modulation(PWM) value through Proportion Integration Differentiation(PID) algorithm to control the speed and directions of the motor. Experimental results show that the distance deviation is less than 9 cm and the angle deviation is less than 10 degrees by this method, which proves that intelligent vehicle positioning is more accurate than before.

Abstract：In order to solve the problem that the classical PID control algorithm can not adapt to the nonlinear controlled system,the robustness is weak and the anti-interference ability is poor,a control method was designed based on classical PID control and auto disturbance rejection technology. This control method provides real-time observation and compensation for uncertainties and external disturbances in aircraft attitude calculation.Finally, the digital simulation model of the classic cascade PID controller and the auto disturbance rejection PID controller is built in Simulink, and then the simulation results show that the response time of the auto disturbance rejection controller is 30% faster than the traditional cascade PID controller，the state error is 15% lower than the traditional cascade PID controller, and the overshoot is reduced by 20%. It is concluded that the quadrotor control method of PID combined auto disturbance rejection technology can be well adapted to the quadrotor aircraft nonlinear system, which can achieve the effect of suppressing external interference and compensating system control error.

Abstract：As an important national infrastructure, the security problems of industrial control systems have received widespread attention from all walks of life. This paper focuses on the tobacco industry. According to the industry characteristics of the tobacco industry and the special needs of informatization and industrial control system information, it is fully absorbed through on-site investigation, simulation evaluation, reference to industrial safety manufacturers and typical solutions and implementation cases in the industry. Based on the experience and lessons learned, a set of industrial control system security solutions suitable for use in the tobacco industry has been developed. The program has the characteristics of conforming to the industry, defense-oriented, genetic safety and practicality.

Abstract：Indoor safety concerns the safety of people′s life and property. Through indoor intrusion detection, it is possible to achieve early warning and avoid loss. Different from the common intrusion detection methods, the CSI(Channel status information) of the wireless communication signal WiFi is used to correlate with human behavior, which can achieve intrusion detection. The relationship between channel impulse response, channel frequency response and CSI is studied. The association between CSI and human behavior is verified using CSI dataset EHUCOUNT and machine learning method. The results show that the accuracy of intrusion detection based on SVM(Support Vector Machine) and CNN(Convolutional Neural Network) in six typical scenarios is 93.35%～99.23% and 89.17%～99.14%, respectively. Actual tests are carried out through collecting the WiFi signal using self-made spectrum sensor nodes. Experiment results show that intrusion detection accuracy is about 98%, which indicates that the intrusion detection based on WiFi signal is applicable to real scenario.

Abstract：In the field radio spectrum observation study, the demand for spectrum measurement tools becomes increasingly stringent, so a spectrum measurement system with storage function based on STM32 is designed in this paper. The system realizes the acquisition and storage of output power signals under different working conditions through ADF4351, loop filter and USB flash disk, and controls the frequency output mode and frequency switching of the system through key selection and keyboard input, which can be widely used in the field radio spectrum observation.

Abstract：Aiming at the problems of poor real-time performance and imperfect functions of monitoring system for box-type substation, an intelligent and remote monitoring system of box-type substation based on ARM and DSP is designed. The hardware block diagram and the working principle diagram of the system are given, and the modules such as analog acquisition and switch input/output are designed. On the basis of the flow diagrams including main program, the analog quantity, the switch quantity and the GPRS communication, the intelligent and remote box-type substation monitoring software is developed, which realizes the real-time monitoring of environment, electrical and switching parameters and other functions, such as data query, fault early warning, and energy efficiency analysis. The experimental results show that the system has the characteristics of real-time, multi-function and high stability, which is of great significance for implementing defensive maintenance, improving power supply quality, saving energy and reducing consumption.

Abstract：Airborne lidar has a wide range of applications in mapping, exploration and so on. Its data processing uses the ranging data of LiDAR and the position and orientation information to obtain high precision surface models. In order to meet the real-time requirements of airborne LiDAR points position cloud calculation, a software-hardware co-design based method is used to design and implement the SoC of points position cloud calculation. A high-performance hardware accelerator is realized by using the AXI-4-based DMA high-speed transmission and using pipeline optimization and storage optimization methods. The experimental results show that the proposed SoC of points position cloud calculation can meet the real-time processing requirements of the airborne platform.

Abstract：In order to meet the requirements of MHz high frequency driving in SAW(surface acoustic wave)-electronic cigarette atomization chip, a novel driving and controlling circuit has been designed and developed based on MCU control and DDS(direct digital frequency synthesis) technology, which is composed of MCU control module, signal generation module, signal processing module, human-machine interaction module, and power supply module. The systematic test platform has been setup, and the working performance of the driving and controlling circuit has been tested and analyzed. The results show that the circuit can realize sinu- soidal signal output with high frequency from 0 MHz to 65 MHz, small frequency error(~0.02%-1.9%), and adjustable power up to 4.5 W. Further, the circuit also shows significant performances with stable and reliable signal output, high precision, wide frequency range, and strong load driving capability. The work of this paper will potentially drive the application of SAW technology in the atomization of E-liquid, and the circuit can also be extended to be applied in other fields in SAW-microfluid atomization.

Abstract：The inconsistency among the battery cells for electric vehicle affects the performance and life expectancy of the batteries. A mixed optimal control scheme based on capacity balance and voltage balance is proposed. The scheme gives priority to capacity balance, as well as combines with the voltage balance, which makes full use of the advantages of these schemes. In addition, through the practical experiment, especially for lithium iron phosphate battery, it is proved that this strategy achieved higher efficiency and better effect than the traditional balance scheme- voltage equilibrium. This strategy can greatly improve the inconsistency among the battery cells and boost the battery capacity.

Abstract：To overcome the failure of power electronic transformer in resisting input voltage interruption in power grid, a combination between energy storage link and PET(power electronic transformer) is utilized. The energy storage link consists of an ultracapacitors and a bidirectional DC/DC converter. When input voltage interruption occurs, PET with energy storage link can maintain PET′s low DC voltage to be stable. The main parameters of energy storage link are analyzed, the control strategy of the link is designed, and the simulation experiment is built in the MATLAB/Simulink. The simulation experiment results verify the ability of a diagram of PET with energy storage link can resist input voltage interruption in power grid, making the safe and stable operation of equipment in power grid.

Abstract：The traditional L filter has the disadvantages of poor filtering effect, and the LCL filter is designed to further reduce the harmonic loss of the high frequency switching frequency. When the number of control parameters of the rectifier and the optimization objective function increase, the traditional particle swarm optimization(PSO) algorithm can adjust the filter and controller parameters, there are disadvantages such as unstable convergence of the iteration. An improved multi-objective multi-group multi-position multi-velocity particle swarm optimization(MMMMPSO) algorithm is proposed to effectively optimize the design parameters of three-phase VIENNA rectifiers and improve the dynamic and steady-state characteristics of the system. Finally, the simulation and experiments verify the efficiency of the rectifier and the correctness of MMMMPSO.

Abstract：Electric vehicle battery internal parameters vary with load and working conditions, so it is necessary to establish an accurate power battery model. Based on the equivalent circuit model of lithium battery and considering the influence of operating temperature and state of charge(SOC) on component parameters, this paper relied on charge and discharge method, combined hybrid pulse power characteristic(HPPC) tests and least squares method to realize each component parameter identification. The power battery model and the charge and discharge model were constructed by Simulink platform. The above models realized the accurate estimation of SOC by the ampere-hours measurement method and considering temperature influence. The results show that the lithium battery parameters identification model can accurately simulate operating characteristics of the power battery under various load conditions. The design can be applied to testing and developing power batteries.