Pub Date : 2003-07-31DOI: 10.1109/ICOSP.2002.1180113
T. Suzuki, T. Tanaka
In inverse-GPS (Global Positioning System), intersymbol interference greatly influences the positioning error. The paper deals with a new interference canceller by means of which the error is reduced. The interference canceller which we propose is composed of a DLL (delay locked loop) and adaptive filter. Only a primary phase of a replica signal is estimated in DLL. Then, the exact wave is generated with the adaptive filter. The intersymbol interference error, which is caused and increased by the number of users, is decreased by the interference canceller which is the combined DLL and adaptive filter.
{"title":"Study on canceling intersymbol interference of inverse-GPS","authors":"T. Suzuki, T. Tanaka","doi":"10.1109/ICOSP.2002.1180113","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1180113","url":null,"abstract":"In inverse-GPS (Global Positioning System), intersymbol interference greatly influences the positioning error. The paper deals with a new interference canceller by means of which the error is reduced. The interference canceller which we propose is composed of a DLL (delay locked loop) and adaptive filter. Only a primary phase of a replica signal is estimated in DLL. Then, the exact wave is generated with the adaptive filter. The intersymbol interference error, which is caused and increased by the number of users, is decreased by the interference canceller which is the combined DLL and adaptive filter.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125444683","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1181193
Weiwei Xing, Weibin Liu, Baozong Yuan
Superquadric parameter extraction is essential for superquadric-based reconstruction from 2D images and 3D data, but most of the search algorithms for superquadric parameter extraction are suboptimal and they are susceptible to being trapped into local optima. In this paper, we propose a search based on a real-coded genetic algorithm (RCGA) for parameter extraction, which applies the genetic algorithm to superquadric-based fitting computation. Numerical fitting experiments for comparison of GA parameters and genetic operators are carried out. Results obtained show the efficiency, robustness and accuracy of the RCGA-based search algorithm, which not only solves the problem of being trapped into local optima, but also performs quickly and reliably for superquadric fitting.
{"title":"Real-coded genetic algorithm in superquadric fitting","authors":"Weiwei Xing, Weibin Liu, Baozong Yuan","doi":"10.1109/ICOSP.2002.1181193","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1181193","url":null,"abstract":"Superquadric parameter extraction is essential for superquadric-based reconstruction from 2D images and 3D data, but most of the search algorithms for superquadric parameter extraction are suboptimal and they are susceptible to being trapped into local optima. In this paper, we propose a search based on a real-coded genetic algorithm (RCGA) for parameter extraction, which applies the genetic algorithm to superquadric-based fitting computation. Numerical fitting experiments for comparison of GA parameters and genetic operators are carried out. Results obtained show the efficiency, robustness and accuracy of the RCGA-based search algorithm, which not only solves the problem of being trapped into local optima, but also performs quickly and reliably for superquadric fitting.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114966309","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1180068
Tang Xiaoming, He You, Dong Shijia, Ni Jin-lin
For target movement without velocity information in a passive coherent location system, the unknown Doppler shift between the direct signal and the target echo results in a decrease of the highest peak output value and the occurrence of some false peaks. Several Doppler compensation methods are compared in terms of the Doppler decorrelation loss factor. The Doppler decorrelation loss from the different inherent correlation times of signals and the different overlap times in the cross-correlator is analyzed. Simultaneously, the rationality of two stage processing is explained. In order to reduce the computational burden much more, an FFT pruning algorithm is introduced into segment Doppler compensation. The results of simulations are in close agreement with theory predictions.
{"title":"Doppler compensation for passive coherent location","authors":"Tang Xiaoming, He You, Dong Shijia, Ni Jin-lin","doi":"10.1109/ICOSP.2002.1180068","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1180068","url":null,"abstract":"For target movement without velocity information in a passive coherent location system, the unknown Doppler shift between the direct signal and the target echo results in a decrease of the highest peak output value and the occurrence of some false peaks. Several Doppler compensation methods are compared in terms of the Doppler decorrelation loss factor. The Doppler decorrelation loss from the different inherent correlation times of signals and the different overlap times in the cross-correlator is analyzed. Simultaneously, the rationality of two stage processing is explained. In order to reduce the computational burden much more, an FFT pruning algorithm is introduced into segment Doppler compensation. The results of simulations are in close agreement with theory predictions.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115282665","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1180030
S. Chen, T. B. Cook, L. C. Anderson
We compare some blind finite-impulse-response (FIR) equalisation schemes for high-order quadrature amplitude modulation (QAM) signalling. The popular constant modulus algorithm (CMA) is used as a benchmark in an investigation of two blind FIR equalisers, namely, a bootstrap maximum a posteriori probability (MAP) equaliser and a recently introduced concurrent CMA and decision directed (DD) equaliser (CMA+DD). Both equalisers are known to outperform the CMA considerably at costs of a small increase in computational complexity. Our study indicates that the bootstrap MAP equaliser has a faster convergence rate than the concurrent CMA+DD equaliser.
{"title":"Blind FIR equalisation for high-order QAM signalling","authors":"S. Chen, T. B. Cook, L. C. Anderson","doi":"10.1109/ICOSP.2002.1180030","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1180030","url":null,"abstract":"We compare some blind finite-impulse-response (FIR) equalisation schemes for high-order quadrature amplitude modulation (QAM) signalling. The popular constant modulus algorithm (CMA) is used as a benchmark in an investigation of two blind FIR equalisers, namely, a bootstrap maximum a posteriori probability (MAP) equaliser and a recently introduced concurrent CMA and decision directed (DD) equaliser (CMA+DD). Both equalisers are known to outperform the CMA considerably at costs of a small increase in computational complexity. Our study indicates that the bootstrap MAP equaliser has a faster convergence rate than the concurrent CMA+DD equaliser.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115370141","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1181170
Huang Xi-shan, Chen Zhe
Multisensor images have different gray level characteristics while contours representing region boundaries are preserved in most cases. A contour-based registration algorithm which uses region boundaries and other well-defined edges as matching primitives is presented. This algorithm integrates the invariant moments with the orientation function of the contours to establish the correspondences of the contours in the two images, e.g. CCD and infrared (IR). The improved wavelet-based fuzzy contour extraction is developed. For the feature matching, an orientation function matching is proposed and integrated to the invariant moments to correspond the extracted contours. The contours with at least two salient points and others with only one salient point are matched separately. The correspondence salient points are used as control-point pairs, and the transformation parameters are estimated based on them. This approach implements automatically and works well for the image pairs in which contour information is well preserved. Experimental results for the CCD and IR images are used to test and verify the theory and algorithm presented in this in this paper.
{"title":"A wavelet-based multisensor image registration algorithm","authors":"Huang Xi-shan, Chen Zhe","doi":"10.1109/ICOSP.2002.1181170","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1181170","url":null,"abstract":"Multisensor images have different gray level characteristics while contours representing region boundaries are preserved in most cases. A contour-based registration algorithm which uses region boundaries and other well-defined edges as matching primitives is presented. This algorithm integrates the invariant moments with the orientation function of the contours to establish the correspondences of the contours in the two images, e.g. CCD and infrared (IR). The improved wavelet-based fuzzy contour extraction is developed. For the feature matching, an orientation function matching is proposed and integrated to the invariant moments to correspond the extracted contours. The contours with at least two salient points and others with only one salient point are matched separately. The correspondence salient points are used as control-point pairs, and the transformation parameters are estimated based on them. This approach implements automatically and works well for the image pairs in which contour information is well preserved. Experimental results for the CCD and IR images are used to test and verify the theory and algorithm presented in this in this paper.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115475737","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1180969
Ze Tian, Dunshan Yu, Yuxiao Qiu
Multiply and multiply-accumulate (MAC) instructions (see ARM DDI0l00E, ARM Architecture Reference Manual) are fundamental instructions in DSP applications. In an embedded digital signal processing (DSP) core and high-performance enhanced DSP instruction processor core, the implementation of high-performance multiply and MAC instructions is very important. An algorithm of 32/spl times/32 multiply and MAC instructions' VLSI implementation with 32/spl times/8 multiplier-accumulator in DSP applications is presented. The 32/spl times/32 multiplication is achieved by 4 times 32/spl times/8 multiplication. The result of one 32/spl times/8 multiplication serves as a partial product of the next 32/spl times/8 operation; when the result of four such multiplications is accumulated, we get the result of 32/spl times/32. The 32/spl times/8 multiplication is only implemented by the hardware Booth multiplier. The algorithm of multiply and MAC instructions' implementation is the better trade-off between serial multiplier and parallel multiplier.
{"title":"A high effective algorithm of 32-bit multiply and MAC instructions' VLSI implementation with 32/spl times/8 multiplier-accumulator in DSP applications","authors":"Ze Tian, Dunshan Yu, Yuxiao Qiu","doi":"10.1109/ICOSP.2002.1180969","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1180969","url":null,"abstract":"Multiply and multiply-accumulate (MAC) instructions (see ARM DDI0l00E, ARM Architecture Reference Manual) are fundamental instructions in DSP applications. In an embedded digital signal processing (DSP) core and high-performance enhanced DSP instruction processor core, the implementation of high-performance multiply and MAC instructions is very important. An algorithm of 32/spl times/32 multiply and MAC instructions' VLSI implementation with 32/spl times/8 multiplier-accumulator in DSP applications is presented. The 32/spl times/32 multiplication is achieved by 4 times 32/spl times/8 multiplication. The result of one 32/spl times/8 multiplication serves as a partial product of the next 32/spl times/8 operation; when the result of four such multiplications is accumulated, we get the result of 32/spl times/32. The 32/spl times/8 multiplication is only implemented by the hardware Booth multiplier. The algorithm of multiply and MAC instructions' implementation is the better trade-off between serial multiplier and parallel multiplier.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"448 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123055446","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1179951
Bo Huang, Yong Yang, Qiao Wang, Le-nan Wu
In this paper, we present a video segmentation algorithm for object-based coding based on fuzzy clustering using multi-features. Three features (color, motion and position) are chosen to consist of feature space, as inputs to the fuzzy clustering algorithm. A new block matching motion estimation algorithm is introduced and the value of DFD (displace frame difference) is used to measure the reliability of different features. At the same time, the distance metric and objective function of the fuzzy clustering algorithm are modified to improve the spatial cohesion of the segmentation results. Simulation results demonstrate the performance of the algorithm.
{"title":"Video segmentation based-on fuzzy clustering and multi-features","authors":"Bo Huang, Yong Yang, Qiao Wang, Le-nan Wu","doi":"10.1109/ICOSP.2002.1179951","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1179951","url":null,"abstract":"In this paper, we present a video segmentation algorithm for object-based coding based on fuzzy clustering using multi-features. Three features (color, motion and position) are chosen to consist of feature space, as inputs to the fuzzy clustering algorithm. A new block matching motion estimation algorithm is introduced and the value of DFD (displace frame difference) is used to measure the reliability of different features. At the same time, the distance metric and objective function of the fuzzy clustering algorithm are modified to improve the spatial cohesion of the segmentation results. Simulation results demonstrate the performance of the algorithm.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124276981","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1180160
T. Hayashi
The paper presents a new approach to the construction of two-dimensional sequences that gives sequences having a low peak factor and flat power spectrum.
本文提出了一种构造二维序列的新方法，使序列具有低峰值因子和平坦功率谱。
{"title":"Synthesis of two-dimensional low-peak white noise sequences","authors":"T. Hayashi","doi":"10.1109/ICOSP.2002.1180160","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1180160","url":null,"abstract":"The paper presents a new approach to the construction of two-dimensional sequences that gives sequences having a low peak factor and flat power spectrum.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121084990","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1180069
Zhiqun Yang, JinLin Ni, Guo-Sui Liu
In the stretch processing system of linear FM (chirp modulation), the time delay of the return is converted into frequency. The frequency and time delay are proportional to the target range. Each intermediate frequency (IF) pulse occupies a different time interval, indicating the variation in time delay as a function of range. It results in a high sidelobe when proceeding with a uniform weight in the whole time width. The paper describes the delay compensation technology by a subband filter group which can reduce the sidelobe level of the weighted signal greatly after the synthesis of multiple channels.
{"title":"Delay compensation of stretching signal in OTHR","authors":"Zhiqun Yang, JinLin Ni, Guo-Sui Liu","doi":"10.1109/ICOSP.2002.1180069","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1180069","url":null,"abstract":"In the stretch processing system of linear FM (chirp modulation), the time delay of the return is converted into frequency. The frequency and time delay are proportional to the target range. Each intermediate frequency (IF) pulse occupies a different time interval, indicating the variation in time delay as a function of range. It results in a high sidelobe when proceeding with a uniform weight in the whole time width. The paper describes the delay compensation technology by a subband filter group which can reduce the sidelobe level of the weighted signal greatly after the synthesis of multiple channels.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121122039","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 : 2002-08-26DOI: 10.1109/ICOSP.2002.1181054
Y. Erhel, A. Bisiaux, L. Bertel, D. Lemur
The paper presents an operational system of digital transmission within the HF frequency range, aiming at a significant increase of the data transfer rate compared with the current standard. Therefore, an array processing method performs with a set of four collocated sensors, the spatial responses of which are different one from each other. This diversity induces a well-conditioned problem of spatio-temporal equalization which tends to reduce the effect of multipath interference. The implemented method resorts to a classical LMS algorithm involving training sequences. Several waveforms have been tested and the experimental results reach the expected goal as the data transfer rate increases up to 15 kbits/s in a bandwidth of 3 kHz.
{"title":"Array processing without any space diversity: application in the HF band (3-30 MHz)","authors":"Y. Erhel, A. Bisiaux, L. Bertel, D. Lemur","doi":"10.1109/ICOSP.2002.1181054","DOIUrl":"https://doi.org/10.1109/ICOSP.2002.1181054","url":null,"abstract":"The paper presents an operational system of digital transmission within the HF frequency range, aiming at a significant increase of the data transfer rate compared with the current standard. Therefore, an array processing method performs with a set of four collocated sensors, the spatial responses of which are different one from each other. This diversity induces a well-conditioned problem of spatio-temporal equalization which tends to reduce the effect of multipath interference. The implemented method resorts to a classical LMS algorithm involving training sequences. Several waveforms have been tested and the experimental results reach the expected goal as the data transfer rate increases up to 15 kbits/s in a bandwidth of 3 kHz.","PeriodicalId":159807,"journal":{"name":"6th International Conference on Signal Processing, 2002.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125276515","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：