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Fourth International Symposium on Signal Processing and Its Applications最新文献

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Performance Estimation of Walsh Coded Cdma System with Multiuser Interference 多用户干扰下沃尔什编码Cdma系统的性能估计
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615716
Lei Wei, S. Muthu, R. Kennedy
{"title":"Performance Estimation of Walsh Coded Cdma System with Multiuser Interference","authors":"Lei Wei, S. Muthu, R. Kennedy","doi":"10.1109/ISSPA.1996.615716","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615716","url":null,"abstract":"In this paper, the performance of a Walsh coded CDMA system is estimated by optimal conditional Importance Sampling where multiuser interference is considered. The equations used to compute the conditional error probability for a given multiuser interference are derived. The results show the proposed method is much more efficient than the Monte Carlo simulation method.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127693409","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}
引用次数: 1
Fractal Image Coding for Thumbnail Based Image Access 基于缩略图的分形图像编码
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615701
H. Cohen
{"title":"Fractal Image Coding for Thumbnail Based Image Access","authors":"H. Cohen","doi":"10.1109/ISSPA.1996.615701","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615701","url":null,"abstract":"A variant of block-oriented fractal coding termed thumb fractal is introduced that essentially is the Jacquin-Barnsley block-oriented fractal code for the (signed) difference image between the target image and the image thumbnail exploded to fullsize. Thumb fractal code involves fewer block parameters than other fractal coding, as data from the image thumbnail is utilised in image generation. Using domain block to range block size ratio of 4 for thumb fractal code yields a super-fast converging codec, with initial image the exploded thumb. This codec is especially suitable for thumbnail-based image access, where image retrieval is preceded by thumbnail access and diaply.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121138107","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}
引用次数: 3
Effect Of Component Non-idealities On Optical Oversampled Analog-to-digital Converter Resolution 元件非理想性对光过采样模数转换器分辨率的影响
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615182
G. Nott, K. Grant, E. Goldys, A. P. Willis, P. Atanackovic, W. Marwood
{"title":"Effect Of Component Non-idealities On Optical Oversampled Analog-to-digital Converter Resolution","authors":"G. Nott, K. Grant, E. Goldys, A. P. Willis, P. Atanackovic, W. Marwood","doi":"10.1109/ISSPA.1996.615182","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615182","url":null,"abstract":"An optical implementation of an oversampled analog-todigital converter has been proposed by Shoop and Goodman [ 11, which comprises two subtraction nodes and a combined signal comparator and output quantiser. This paper discusses the limitations on system resolution due to non-idealities in the circuit components. The subtracter's layout is discussed and a model of its operation presented. The effect of subtraction node white noise on system performance is also investigated. The comparator/quantiser is described and the effect of its finite contrast ratio on system performance simulated.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115957609","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}
引用次数: 0
Blind Identification of Multiple Fir Channels 多Fir信道的盲识别
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615721
W. Qiu, Y. Hua
{"title":"Blind Identification of Multiple Fir Channels","authors":"W. Qiu, Y. Hua","doi":"10.1109/ISSPA.1996.615721","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615721","url":null,"abstract":"We study the performances of the subspace (SS), cross-relation (CR) and two-step maximum likelihood (TSML) methods for estimating the impulse responses of multiple FIR channels driven by an unknown input sequence. Assuming a large data size or/and a high SNR, the estimation variances of the SS and CR methods are derived. The performances of the three methods are studied and compared against the Cramer-Rao bound (CRB). It is shown that the TSML method significantly outperforms the SS and CR methods and attains the CRB over a wide range of SNR. It is also shown that the SS method is more robust to iii channel conditions than the CR method, while the two methods show nearly identical performances for well-conditioned channels.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116060102","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}
引用次数: 2
Detection fo Short-Term Nonlinear Wave Phenomena Using Higher-Order Wavelet-Based "Spectra" 基于高阶小波的“谱”检测短期非线性波动现象
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615125
S. Mehta, E. Powers, In-Seung Park
{"title":"Detection fo Short-Term Nonlinear Wave Phenomena Using Higher-Order Wavelet-Based \"Spectra\"","authors":"S. Mehta, E. Powers, In-Seung Park","doi":"10.1109/ISSPA.1996.615125","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615125","url":null,"abstract":"The objective of this paper is to utilize a-mvelet-based higher-order spectral analysis approach to detect and quantify short-term nonlinear phenomena. The original concept appeared in [6]. The concept will be demonstrated by utilizing it to detect short-term nonlinear wave phenomena in laboratory generated random sea wave data. Such phenomena is responsible for the generation of large amplitude waves. A second-order time domain Volterra model is also utilized to demonstrate phase locking of the first-and second-order components .","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116301500","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}
引用次数: 0
Estimating The Period Of A Pulse Train From A Noisy Measurements 从噪声测量中估计脉冲序列的周期
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615190
I. Clarkson, S. Howard, I. Mareels
{"title":"Estimating The Period Of A Pulse Train From A Noisy Measurements","authors":"I. Clarkson, S. Howard, I. Mareels","doi":"10.1109/ISSPA.1996.615190","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615190","url":null,"abstract":"The problem of estimation of the period of a pulse train from a set of sparse, noisy measurements of the times-ofarrival, and the association of pulse indices with the measurements, is considered for a pair of statistical models of the measurement process. We find that the estimation and association problem can be formulated as a simultaneous Diophantine approximation problem. We propose an algorithm for obtaining estimates and associations based on the LLL algorithm [SI. We also show a relationship with the maximisation of a certain trigonometric sum, which can be regarded as the periodogram of the measurements. We present some numerical results which indicate that the algorithm is able to make correct associations of pulse indices, and therefore accurate estimates of the period, with very high probability even for very sparse, short and noisy records. This is demonstrated in examples in which 99.9% of pulses are missiig and as few as 9 pulses are recorded with average errors of up t o 1% of the period on each measurement and yet the experimental frequency of correct association was more than 99%.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114356952","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}
引用次数: 0
Gps/ins Integrated Navigation Using a Gps Antenna Array 基于Gps天线阵列的Gps/ins集成导航
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615726
K. J. Turner, F. Faruqi
{"title":"Gps/ins Integrated Navigation Using a Gps Antenna Array","authors":"K. J. Turner, F. Faruqi","doi":"10.1109/ISSPA.1996.615726","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615726","url":null,"abstract":"An integrated Global Positioning System/Inertial Navigation System (GPS/INS) navigation model is developed specifically for aerospace applications involving high vehicle dynamics. To aid attitude determination a non-dedicated multiple GPS antenna configuration is employed. Simulated results show that the resulting Extended Kalman Filter (EKF) implementation provides robust estimates of the vehicle states. Additional investigation focusses upon filter performance sensitivity to antenna noise correlation and antenna displacements.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127056611","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}
引用次数: 0
Image Processing on an Fpga Based Custom Computing Platform 基于Fpga的自定义计算平台图像处理
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615756
C. Dick
{"title":"Image Processing on an Fpga Based Custom Computing Platform","authors":"C. Dick","doi":"10.1109/ISSPA.1996.615756","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615756","url":null,"abstract":"Considerable success has been achieved in developing algorithms that are efficient from the standpoint of number of operations. However what is needed now is to develop hardware architectures that can efficiently exploit these reduced computational complexity algorithms. In this paper an architecture is described that takes advantage of the reduced computational requirements of the polynomial transform method for computing 2-D DFTs of images. The system is based on Xilinx field programmable gate arrays (FPGAs). The performance of the architecture is presented and the advantages of the implementation in terms of area efficiency and computation rate are highlighted.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124856047","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}
引用次数: 1
Prediction of Long-Range Dependent Processes for Teletraffic Applications 远程依赖过程在远程通信应用中的预测
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615707
A. G. Qureshi
{"title":"Prediction of Long-Range Dependent Processes for Teletraffic Applications","authors":"A. G. Qureshi","doi":"10.1109/ISSPA.1996.615707","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615707","url":null,"abstract":"Recent studies have shown that trafic in telecommunication networks exhibits long-range dependence (LRD). Accurate modelling and analysis of teletrafic incorporating LRD is therefore required in network engineering. Prediction of trafic levels can play an important role in teletrafic analysis for dynamic resource allocation and traffic management. This paper presents the formulation of a model based recursive , linear minimum mean-square error predic- tor for LRD processes. A Kalman predictor is pro- posed for LAD processes modelled by fractional autoregressive integrated moving average CfARIMA) models. The family of fARIMA models can account for long range, as well as short range and qwi-peri- odic dependencies typical of teletraffic data.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124923011","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}
引用次数: 0
Enhanced Hit Rate Simulated Annealing in Codebook Training 码本训练中提高命中率的模拟退火
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615699
P. Tsang, W. T. Lee
{"title":"Enhanced Hit Rate Simulated Annealing in Codebook Training","authors":"P. Tsang, W. T. Lee","doi":"10.1109/ISSPA.1996.615699","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615699","url":null,"abstract":"Codebook generation and optimization in the Vector Quantization system is a high dimensional and nonlinear optimization process. Lloyd's algorithm aims at the finding of the least mean square between the training vectors and their centroids. The major problem of this method is ''local optimal state''. Therefore Simulated Annealing (SA) is applied in the optimization of the codebook in VQ system. In the existing SA scheme, the successful rate of each generation, especially in the end of the process, would be very low. In this paper, novel schemes (Local Region Searching and Least Frequently Hit) are suggested to enhanced the performance and arise the hit rate of the generation of the existing SA algorithms. From the experimental result, the hit rate is arise by over 100 times of existing method. Improvement is found in both the fidelity testing and perception testing on the decoded image.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"15 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124091854","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}
引用次数: 1
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