As we know,the target classification of synthetic aperture radar(SAR) image is often affected by its *** we want to find a new method to solve the *** with K Nearest Neighbor(KNN) learner is a novel approach which has...
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As we know,the target classification of synthetic aperture radar(SAR) image is often affected by its *** we want to find a new method to solve the *** with K Nearest Neighbor(KNN) learner is a novel approach which has many advantages over other conversational methods such as simplicity and good generalization *** this paper,we intend to improve the performance of the SAR image target recognition system by introducing a novel method combining optimizing annular region-weighted distance KNN with BagWithProb ensemble learning *** feature vectors of target images are extracted with principal component analysis in wavelet *** studied in this paper indicate that the proposed method can effectively improve the accuracy of the new system.
The electronic devices installed on vehicle become more and more powerful,which form a complicated electromagnetic field in the *** problems of Electromagnetic Compatibility (EMC) are so serious that it's necessar...
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The electronic devices installed on vehicle become more and more powerful,which form a complicated electromagnetic field in the *** problems of Electromagnetic Compatibility (EMC) are so serious that it's necessary to evaluate the EMC performance in vehicular communication *** this paper fuzzy analytical hierarchy process(FAHP) method is exploited as a means of key effective factors evaluation *** this basic,the paper builds up the evaluation indicator system and its hierarchical ***,in an example,a vehicular communication system is evaluated and the conclusion is proved positive,reasonable and credible. The indicator system and evaluation method in this paper can meet the requirements of the vehicular communication system EMC evaluation.
Reliable end-to-end quality of service(QoS) guarantee is essential for broadband mobile *** QoS metric models are designed for evaluation of network and service performance instead of user *** models are based on netw...
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Reliable end-to-end quality of service(QoS) guarantee is essential for broadband mobile *** QoS metric models are designed for evaluation of network and service performance instead of user *** models are based on network measurement results, which can not directly reflect the user experience when using the specific *** mis paper,we bring forward a novel user-oriented end-to-end QoS metric framework.A three-dimensional hierarchical QoS metric model is *** this model,we define a user-experience layer from the perspective of services and user *** model is suitable for different kinds of services. Furthermore,the relationship between QoS and quality of experience(QoE) is investigated.A QoS metric framework for Web service is analyzed to validate the framework is feasible and available.
Space-time block codes(STBCs) play an important role in spatial diversity technologies. The Alamouti scheme provides full diversity,full rate and needs simple separating decoding but is for only two *** more than two ...
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Space-time block codes(STBCs) play an important role in spatial diversity technologies. The Alamouti scheme provides full diversity,full rate and needs simple separating decoding but is for only two *** more than two antennas,quasi-orthogonal space-time block codes(QOSTBCs) are able to provide full rate but enjoy only a partial diversity and need pairwise *** recently proposed constellation-rotated QOSTBCs(CR-QOSTBCs) can achieve both full diversity and full rate. In this paper,we propose a novel transmit diversity scheme based on CR-QOSTBC and multi-carrier code division multiple access(MC-CDMA),using four transmit antennas and one receive antenna, which not only provides full diversity and full rate but also uses simple decoding,achieves good performance in frequency selective fading channels due to the ability of diversities in space,time, frequency and *** simulation is then complimented to show that the bit error rate(BER) performance of CR-QOSTBC-MC-CDMA to is improved distinctly.
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