Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.4348236
Jiang Fei, Liu Zhong
To break through strict preconditions of the coupling matrix between drive and response systems in traditional impulsive research, a new method of computing conditional Lyapunov exponent for impulsive synchronization of chaotic system is introduced to study impulsive synchronization. This method is developed on the basis of the classical Wolfs Algorithm and can compute conditional Lyapunov exponent effectively by adding impulsive control. The impulsive intensity is determined by the impulse coupling matrix between drive and response systems. Moreover the computation load can be simplified greatly by setting computing step size equal to impulsive control interval. The correctness and availability of this method is verified by computing the maximum conditional Lyapunov exponent of Lorenz system and simulation results show this method effective and useful.
{"title":"Study on Impulsive Synchronization of Chaotic System by Computing Conditional Lyapunov Exponent","authors":"Jiang Fei, Liu Zhong","doi":"10.1109/ICCCAS.2007.4348236","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.4348236","url":null,"abstract":"To break through strict preconditions of the coupling matrix between drive and response systems in traditional impulsive research, a new method of computing conditional Lyapunov exponent for impulsive synchronization of chaotic system is introduced to study impulsive synchronization. This method is developed on the basis of the classical Wolfs Algorithm and can compute conditional Lyapunov exponent effectively by adding impulsive control. The impulsive intensity is determined by the impulse coupling matrix between drive and response systems. Moreover the computation load can be simplified greatly by setting computing step size equal to impulsive control interval. The correctness and availability of this method is verified by computing the maximum conditional Lyapunov exponent of Lorenz system and simulation results show this method effective and useful.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124553893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.4348278
Mingzhi He, Jianping Xu, Zhongwen Zhou, Ni Chen, Guohua Zhou
Digital control of switching dc-dc converters brings many benefits including capability to implement advanced control algorithm that is often complex. Nonlinear compensation function with digital PID of power coefficients is proposed in this paper. The describing function is adopted for analysis. The transient response under different load variations is investigated by simulation and compared with the converters employing linear PID compensation. The experiment system is also set up on PGA platform to verify the analysis and simulation results. By comparison, nonlinear compensated converter has much better transient performance than the linear compensated one.
{"title":"Nonlinear Compensation in Digital Controller of Switching DC-DC Converters","authors":"Mingzhi He, Jianping Xu, Zhongwen Zhou, Ni Chen, Guohua Zhou","doi":"10.1109/ICCCAS.2007.4348278","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.4348278","url":null,"abstract":"Digital control of switching dc-dc converters brings many benefits including capability to implement advanced control algorithm that is often complex. Nonlinear compensation function with digital PID of power coefficients is proposed in this paper. The describing function is adopted for analysis. The transient response under different load variations is investigated by simulation and compared with the converters employing linear PID compensation. The experiment system is also set up on PGA platform to verify the analysis and simulation results. By comparison, nonlinear compensated converter has much better transient performance than the linear compensated one.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123492918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.6250846
J.Y. Huang, Z.X. Chen, Q. Wan, W.L. Yang
Estimation of mobile station location is made difficult by nonsymmetric contamination of measured data caused by NLOS propagation effects. In this paper, a novel algorithm based on kriging method is proposed to reduce the effects of NLOS propagation on the location error. Simulation results show that the proposed algorithm clearly outperforms two other algorithms (non-parametric kernel method and parametric least square method) and comes close to meeting Cramer Rao lower bound (CRLB).
{"title":"Kriging estimator for mobile station positioning under non-line-of-sight (NLOS) conditions","authors":"J.Y. Huang, Z.X. Chen, Q. Wan, W.L. Yang","doi":"10.1109/ICCCAS.2007.6250846","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.6250846","url":null,"abstract":"Estimation of mobile station location is made difficult by nonsymmetric contamination of measured data caused by NLOS propagation effects. In this paper, a novel algorithm based on kriging method is proposed to reduce the effects of NLOS propagation on the location error. Simulation results show that the proposed algorithm clearly outperforms two other algorithms (non-parametric kernel method and parametric least square method) and comes close to meeting Cramer Rao lower bound (CRLB).","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128456453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.6247584
Yanming Xiong, Min Wei, Yuehuan Gong, Yuehuan Gong
Channel estimation method is a key issue in MIMO system. In recent years, a lot of papers on subspace(SS)-based blind channel estimation have been published, and in this paper, combining SS method with a space-time coding scheme, we proposed a novel blind channel estimation method in MIMO system. Simulation result demonstrates the effectiveness of this method.
{"title":"A novel blind channel estimation method for MIMO system","authors":"Yanming Xiong, Min Wei, Yuehuan Gong, Yuehuan Gong","doi":"10.1109/ICCCAS.2007.6247584","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.6247584","url":null,"abstract":"Channel estimation method is a key issue in MIMO system. In recent years, a lot of papers on subspace(SS)-based blind channel estimation have been published, and in this paper, combining SS method with a space-time coding scheme, we proposed a novel blind channel estimation method in MIMO system. Simulation result demonstrates the effectiveness of this method.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129895643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.4348165
Chen Jian, Yang Ming, J. Jiang
In this paper, a new DCT block-edge-pattern and high efficient method for compressed image retrieval is proposed. This method directly extracts three edge patterns from compressed image to construct 3D and 4D histogram. Then uses them and the run-length histogram as the feature -based indexing keys to retrieve images. The results of our two-stage experiments show that the superior performances of our method than other exiting method in retrieval precision, processing speed and robust to noise and color change.
{"title":"A New Block-edge-pattern and High Efficient Image Retrieval Method in DCT Domain","authors":"Chen Jian, Yang Ming, J. Jiang","doi":"10.1109/ICCCAS.2007.4348165","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.4348165","url":null,"abstract":"In this paper, a new DCT block-edge-pattern and high efficient method for compressed image retrieval is proposed. This method directly extracts three edge patterns from compressed image to construct 3D and 4D histogram. Then uses them and the run-length histogram as the feature -based indexing keys to retrieve images. The results of our two-stage experiments show that the superior performances of our method than other exiting method in retrieval precision, processing speed and robust to noise and color change.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131149880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.4348286
Lin Quan, Zhang Yong-hong, Chen Qi-ke, Fan Yong, Yang Jian-yu, Li Liang-chao
The paper describes a W band radiometer for imaging. A superheterodyne receiver with Dicke switch is used in this radiometer, whose millimeter-wave components, which include a millimeter-wave fundamental wave mixer, a harmonic mixer and a VCO are mounted on the back-end of antenna for lower transmission loss. By this means, the radiometer with sensitivity 0.5 k is achieved. Through the experiment of imaging, the radiometer is shown to meet the requests of the image system.
{"title":"The W Band Radiometer for Imaging","authors":"Lin Quan, Zhang Yong-hong, Chen Qi-ke, Fan Yong, Yang Jian-yu, Li Liang-chao","doi":"10.1109/ICCCAS.2007.4348286","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.4348286","url":null,"abstract":"The paper describes a W band radiometer for imaging. A superheterodyne receiver with Dicke switch is used in this radiometer, whose millimeter-wave components, which include a millimeter-wave fundamental wave mixer, a harmonic mixer and a VCO are mounted on the back-end of antenna for lower transmission loss. By this means, the radiometer with sensitivity 0.5 k is achieved. Through the experiment of imaging, the radiometer is shown to meet the requests of the image system.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130332101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.6250718
Yide Zhang, G. Feng, Le Min Li
We demonstrate in the paper that the applied mobility model has great influences on the system performance of mobile cellular networks. We develop a novel mobility model with Abrupt Event Influence (AEI), as well as the system model, to study to what extent the influences will be, with focusing on the mobility model simulation. We concern the parameters that determine the system performance of mobile cellular networks. We show in this paper that these parameters vary while user mobility changes, but the effects are interactive. Since handoff calls are given a higher priority over new calls and GC mechanism is employed, our analysis shows that a mature mobile cellular network should make use of user mobility characteristics and dynamically adjust its reservation threshold of the handoff call requests. Extensive simulation results validate our analysis.
{"title":"A novel mobility model with Abrupt Event Influence to the system performance of mobile cellular networks","authors":"Yide Zhang, G. Feng, Le Min Li","doi":"10.1109/ICCCAS.2007.6250718","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.6250718","url":null,"abstract":"We demonstrate in the paper that the applied mobility model has great influences on the system performance of mobile cellular networks. We develop a novel mobility model with Abrupt Event Influence (AEI), as well as the system model, to study to what extent the influences will be, with focusing on the mobility model simulation. We concern the parameters that determine the system performance of mobile cellular networks. We show in this paper that these parameters vary while user mobility changes, but the effects are interactive. Since handoff calls are given a higher priority over new calls and GC mechanism is employed, our analysis shows that a mature mobile cellular network should make use of user mobility characteristics and dynamically adjust its reservation threshold of the handoff call requests. Extensive simulation results validate our analysis.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131138681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.4348155
Yingxiang Li, Zhiheng Hu, Xianci Xiao
In this paper, we are interested in the problem of the estimation of polynomial phase signals affected by an additive Gaussian white noise. A method for 3-order polynomial phase signal parameter estimation is proposed. Firstly the segment correlation method is used to obtain linear frequency modulated (LFM) signal. Then some LFM detection and parameter estimation methods are adopted to solve this problem, such as Radon-ambiguity transform, time-domain dechirp, segment correlation dechirp methods. The merit of this new method is validated by illustrative examples in low signal-to-noise ratio (SNR) condition.
{"title":"Joint power distribution algorithm for multi-user downlink of JT MIMO system","authors":"Yingxiang Li, Zhiheng Hu, Xianci Xiao","doi":"10.1109/ICCCAS.2007.4348155","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.4348155","url":null,"abstract":"In this paper, we are interested in the problem of the estimation of polynomial phase signals affected by an additive Gaussian white noise. A method for 3-order polynomial phase signal parameter estimation is proposed. Firstly the segment correlation method is used to obtain linear frequency modulated (LFM) signal. Then some LFM detection and parameter estimation methods are adopted to solve this problem, such as Radon-ambiguity transform, time-domain dechirp, segment correlation dechirp methods. The merit of this new method is validated by illustrative examples in low signal-to-noise ratio (SNR) condition.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126598947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.6250712
Li Zhao, Ruochun Li, Ping Zhang
Frequency offsets in regular OFDM communication systems distort the orthogonality between sub-carriers, which results in inter-carrier interference (ICI). In order to combat the impact of ICI on OFDM systems, an ICI mitigation technique by jointing symbol shift cancellation (SSC) and adjacent sub-channel filter (ASF) is proposed in this paper. At first, the symbol shift cancellation method is used to cancel the impact of ICI on the far sub-carriers, and then the adjacent sub-channel filter method is used to cancel the impact of ICI on the adjacent sub-carriers. By analyzing the distribution of the adjacent inter-carrier interference, a pilot-symbol scheme is proposed to improve the accuracy of channel estimation and simplify the adjacent interference filter method. The proposed algorithm can achieve trade-off between the bandwidth efficiency and the complexity of ICI cancellation method. Simulation results show that the technique proposed in this paper can effectively improve BER (Bit Error Rate) performance of the OFDM system.
{"title":"An intercarrier interference mitigation technique with SSC and ASF in OFDM systems","authors":"Li Zhao, Ruochun Li, Ping Zhang","doi":"10.1109/ICCCAS.2007.6250712","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.6250712","url":null,"abstract":"Frequency offsets in regular OFDM communication systems distort the orthogonality between sub-carriers, which results in inter-carrier interference (ICI). In order to combat the impact of ICI on OFDM systems, an ICI mitigation technique by jointing symbol shift cancellation (SSC) and adjacent sub-channel filter (ASF) is proposed in this paper. At first, the symbol shift cancellation method is used to cancel the impact of ICI on the far sub-carriers, and then the adjacent sub-channel filter method is used to cancel the impact of ICI on the adjacent sub-carriers. By analyzing the distribution of the adjacent inter-carrier interference, a pilot-symbol scheme is proposed to improve the accuracy of channel estimation and simplify the adjacent interference filter method. The proposed algorithm can achieve trade-off between the bandwidth efficiency and the complexity of ICI cancellation method. Simulation results show that the technique proposed in this paper can effectively improve BER (Bit Error Rate) performance of the OFDM system.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127374973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-07-11DOI: 10.1109/ICCCAS.2007.4348123
Wei Huang, Yan-zhong Sun
A new image adaptive watermarking algorithm based on Bidimension Empirical Mode Decomposition (BEMD) is proposed. As a new two-dimensional signal processing tool, BEMD is first introduced into the image watermarking field in this paper. In the proposed algorithm, the cover image is decomposed into several intrinsic mode functions (IMFs) based on its local feature adaptively. Then the human visual system (HVS) model function based on IMFs and the logo image is generated, and inserted into the cover image. BEMD technique is used in the extracting processes as well and the recovered watermark image is obtained clearly. We have tested the robustness of the proposed scheme under cropping, JPEG compression, resizing, median filtering, and additive white Gaussian noise (AWGN) attacks. The experiments indicate that this technique can achieve high imperceptibility while showing good robustness. Furthermore, the proposed method is compared with the block DCT based method, and the experiment result confirms that the proposed method shows better performance.
{"title":"A New Image Watermarking Algorithm Using BEMD Method","authors":"Wei Huang, Yan-zhong Sun","doi":"10.1109/ICCCAS.2007.4348123","DOIUrl":"https://doi.org/10.1109/ICCCAS.2007.4348123","url":null,"abstract":"A new image adaptive watermarking algorithm based on Bidimension Empirical Mode Decomposition (BEMD) is proposed. As a new two-dimensional signal processing tool, BEMD is first introduced into the image watermarking field in this paper. In the proposed algorithm, the cover image is decomposed into several intrinsic mode functions (IMFs) based on its local feature adaptively. Then the human visual system (HVS) model function based on IMFs and the logo image is generated, and inserted into the cover image. BEMD technique is used in the extracting processes as well and the recovered watermark image is obtained clearly. We have tested the robustness of the proposed scheme under cropping, JPEG compression, resizing, median filtering, and additive white Gaussian noise (AWGN) attacks. The experiments indicate that this technique can achieve high imperceptibility while showing good robustness. Furthermore, the proposed method is compared with the block DCT based method, and the experiment result confirms that the proposed method shows better performance.","PeriodicalId":218351,"journal":{"name":"2007 International Conference on Communications, Circuits and Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126717367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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