Abstract:One of the attractive features of OFDM(Orthogonal Frequency Division Multiplexing)is its simple one-tap equalizer.Nevertheless,the channel information has to be identified firstly.In this paper,an OFDM channel estimation method,based on implicit pilot onl

Abstract:In this paper, three types of PKl trust model and their advantages and disadvantages are discussed. Then one of PKl trust model, the network PKI trust model has been improved by adding a path table to the certification. By configuring the path table, the

Abstract:The factors which may affect on the scattering characteristics of a layered dielectric cylinder in the center of a rectangular waveguide are discussed in this paper. Experiments are performed to study the frequency response characteristics of a glass test

Abstract:Many new technologies, including integral DCT, multiform quantization methods selection and precise intra-frame prediction, are adopted in H.264 to improve the image quality. However, this also increase the computation complexity. Using MMX/SSE/SSE2 to op

Abstract:In order to design high precision instantaneous frequency measure(IFM)receiver,it is the most important to solve the problems concerning the microwave correlator featuring good performance.The HFSS is introduced into the design of one kind of X-band strip

Abstract:In order to extract the iris patterns from an eye picture quickly and conveniently, the Gabor function which is formerly used to simulate the simple cells in primary visual cortex is adopted as an eye picture filter function. Through analysing and optimiz

Abstract:Analysis of music pitch can be performed by Fast Fourier Transform. However, some of its spectral line frequencies are different from the defined frequencies of music notes. Constant Q transform can present better perform -ante for music signals. Unfortun

Abstract:A channel estimation method based on decision directed technique and pilot tracking for OFDM WLANS with mobUe terminals is proposed in this paper. The result of training sequence based estimation is used as the initialization of decision directed techniqu

Abstract:The design of high frequency structure of Magnetically Insulated Line Oscillator(MILO)is important.The cooling cavity design of a L-band MILO is studied by Partical in cell(PIC)method.Some important parameters are computed and discussed.The results indica

Abstract:In case of the non-real time phenomena in high dynamic flight of GPS application, Kalman predictive filter is designed to process the positioning data so as to reach the real-time demands. According to this method, the state equation and measure equation

Abstract:In this paper,an adaptive modulation scheme applied in beyond 3G system is discussed,whose planisphere used is adjustable.Simulation was done to the proposed scheme using correlative parameters of beyond 3G system.It can overcome the influences of the tim

Abstract:After a brief description of the basic conception of PCMA technology, the key technology in the whole process of the system is analyzed. And a method of interference delay estimation is proposed and simulated. Simulation results show that the capturing an

Abstract:The UWB(Ultra Wide-Band)transmitted signals spread over a very large frequency band range.They will spread over the frequency bands allocated to the existing narrowband radio systems.So,it is important for us to evaluate the interference issues of these n

Abstract:In order to obtain a large output signal and a small distortion of signal, and to eliminate the effect of damping in the open-loop micro gyroscopes design, the damping and distortion are analyzed theoretically based on differential equation. Requirements

Abstract:The development of video processing is complex on DSP generally. In order to improve the performance of the application program and reduce the time of development, the DSP/B1OS multi-threading by DSP/BIOS kernel and the TMS320DM642 are introduced. By this

Abstract:为了能稳定地识别出接收信号的调制方式，采用分级识别的方案，对软件无线电中用到的六种调制信号（BPSK，QPSK，π／4DQPSK，MSK，GMSK，TFM）进行分类识别，第一级利用反映包络变化的参数对调制信号集进行粗分类，第二级利用从信号平方谱、瞬时相位平方的双谱中提取出的特征参数分类识别。仿真结果表明，该方案在不需要预知精确载波频率的情况下，可达到较高的识别率。

Abstract:UML, the most common object-oriented design technology in recent years,is introduced in program control test system to standardize system structure and behaviors. It has optimized the developing procedures and system structure. This method will give a goo

Abstract:CIC filter and half-band filter are two kinds of important digital filters. Its design and configuration is crucial to the receive of system. In this paper, the application and design of the two kinds of filters in IF digital receiver based on the technol

Abstract:Technologies of cryptography, especially encryption technologies are the core of information security. At first, the principle and category of stream cipher is introduced briefly, then its designing rule and the testing criterion are addressed. Furthermor