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This paper describes an efficient coherent demodulation algorithm aiming at the receiver in Terrestrial Trunked Radio (TETRA) communication system. The algorithm proposes frequency offset error twice-estimation and sectioned phase offset compensation to achieve the high precision in carrier synchronization. Odd-even decision is then proposed in the algorithm to avoid signal noise ratio (SNR) loss...
The linear constrained minimum variance(LCMV) beam former is proposed when there are main lobe interference and other interferences in adaptive beam forming. Generalized side lobe canceller is equivalent to achieve a LCMV structure with the blocking matrix, which is an important part of it. This paper propose a new dimension reduction matrix blocking theory basing on the defects of the general block...
In the isolation testing platform, vibration spectrum is tested, The course of test, result from atmospheric disturbances and optical aberration, That studies typical tracking facula Center of gravity Algorithm and summarizes reason of the algorithm precision, Result in frequency-field facula algorithm. Experiment performance results from the effect of background and anomaly facula and so on. Integrates...
Web services compatibility states the fitness of SOA application in which service peers that interact with each other. How ever, most approaches deal with the compatibility issue only focus on the message interaction, and ignore the authority that a service can access or invoke another service or resources. In this paper, we propose an unified approach in formal analysis of web service in compatibility...
Wireless Ad hoc networks have become a center of research interest over the last few years due to the promise of being self-configurable networks. One critical issue for almost all kinds of portable devices supported by battery power is energy conservation. Without power, any mobile device will become useless. This paper discusses new energy model that prolongs the lifetime of Ad-hoc On-Demand Distance...
Adaptive OFDM technology is the real-time response of the transmitter according to the time-varying channel, it has been widely applied to wireless channels with multi-path interference to build high-speed, reliable communication links. At present, Campello algorithm should be the relatively outstanding adaptive OFDM algorithm in comparison, but it needs a great amount of computation. Hence, we proposes...
Cache techniques have not only received substantial recent research attention, but also been implemented and deployed with success in different networks. Cache techniques are important for reducing Internet access latency, network traffic, and server load in different networks. We give recent advances about Cache techniques and discuss the recent development.
This paper proposes an efficient independent component analysis (ICA) based modulation feature extraction method applied in digital modulation identification. In modulation identification, important information may be contained in the high-order relationship among sampling points. ICA is sensitive to high-order statistic in the data and finds not-necessarily orthogonal bases, so it may better identify...
A new medical image edge extraction algorithm is proposed to extract the significant edge of the medical image to avoid the interference of the internal noise and the external noise. The information measure combined with simulated annealing algorithm is used to remove the internal noise; then wavelet domain HMT model is used to denoise; at last we design quadratic B-spline wavelet to extract the edge...
Wireless Mesh Networks (WMNs) is recently emerged network having robustness. It supports clients to communicate with different types of networks, Internet etc which provides a better service to next generation. It consists of mesh routers and mesh clients. These mesh routers are minimal mobile and mesh clients are totally mobile which operate on batteries. The protocols of Ad hoc networks can be used...
Image is analysed under multi-scale filtering in Canny algorithm frame. Firstly, scale multiplication is defined by filter responses multiplication of two different scales. Then the modulus and orientation is determined by the similarity of adjacent scales. Thirdly, a threshold value is chosen to eliminate false edge. Finally, the edge is obtained after non-maximum suppression. Experimental results...
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