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2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.最新文献

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A modified robust adaptive chaos synchronization 一种改进的鲁棒自适应混沌同步
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458360
R. Raoufi, H. Khaloozadeh
{"title":"A modified robust adaptive chaos synchronization","authors":"R. Raoufi, H. Khaloozadeh","doi":"10.1109/SPCOM.2004.1458360","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458360","url":null,"abstract":"In this paper, a modified robust adaptive chaos synchronization structure is proposed. To increasing the security of the communication network the parameters of the chaotic transmitter is changed. By changing the parameters of the chaotic transmitter (sender section) the conventional state observer (receiver section) cannot be retrieved the actual states properly and the performance of state estimation will be corrupted. By adding on-line parameter identification subsystem to receiver section the performance of the overall system will be improved noticeably. The simulation results exhibit high efficiency of the proposed scheme.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130446154","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: 9
Well defined video object extraction suitable for scalable wavelet based object coding 定义良好的视频对象提取适用于可伸缩的基于小波的对象编码
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458386
F. Tab, G. Naghdy, A. Mertins
{"title":"Well defined video object extraction suitable for scalable wavelet based object coding","authors":"F. Tab, G. Naghdy, A. Mertins","doi":"10.1109/SPCOM.2004.1458386","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458386","url":null,"abstract":"In this paper we present a semi-automatic multi resolution video objects extraction and tracking algorithm well suited to scalable wavelet based object coding. Objects of interest are determined in the first frame through initial user intervention followed by a spatial segmentation algorithm. The specified objects are afterwards tracked in the subsequent frames. The tracking algorithm includes multiresolution Markov random field (MMRF) based spatial segmentation with emphasis on border smoothness in different resolutions and multi resolution backward partition projection. An intensity change detector indicates newly appeared objects/regions. The proposed method produces well defined and visually pleasing objects as well as allowing for larger motion tracking, better noise tolerance and less computational complexity.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129169452","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 of turbo coded signals transmitted through ISI channels using the predictive iterative decoder 利用预测迭代解码器检测通过ISI信道传输的turbo编码信号
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458390
K. Vasudevan
{"title":"Detection of turbo coded signals transmitted through ISI channels using the predictive iterative decoder","authors":"K. Vasudevan","doi":"10.1109/SPCOM.2004.1458390","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458390","url":null,"abstract":"This paper addresses the problem of detecting turbo-coded signals transmitted through channels that introduce inter-symbol interference (ISI). The receiver is simple to implement and it consists of a linear minimum mean squared error (MMSE) equalizer followed by a predictive iterative decoder (PID). Simulation results show that depending on the noise correlation, significant performance improvement can be obtained by using the PID, over that of the conventional iterative decoder (CTD).","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127586340","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
SDR framework for burst/ continuous MPSK/ 16-QAM modems 突发/连续MPSK/ 16-QAM调制解调器的SDR框架
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458357
S. Jayasimha, P. Jyothendar, S. Pavanalatha
{"title":"SDR framework for burst/ continuous MPSK/ 16-QAM modems","authors":"S. Jayasimha, P. Jyothendar, S. Pavanalatha","doi":"10.1109/SPCOM.2004.1458357","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458357","url":null,"abstract":"We describe a software-defined radio (SDR) framework for MPSK/16-QAM pulse-shaping, demodulation, carrier acquisition and tracking for satellite modems. Analytical performance bounds for burst and continuous mode acquisition are validated with measured performance.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117262371","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: 4
A new approach for estimation of wavelets with non-separable kernel from a given image 一种基于核不可分的小波估计的新方法
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458348
A. Gupta, S. Joshi, S. Prasad
{"title":"A new approach for estimation of wavelets with non-separable kernel from a given image","authors":"A. Gupta, S. Joshi, S. Prasad","doi":"10.1109/SPCOM.2004.1458348","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458348","url":null,"abstract":"In this paper, we propose a new approach for the estimation of wavelet with non-separable kernel from a given image. The paper discusses method to the design of biorthogonal 2D-FIR perfect reconstruction filter banks where the filters are estimated from a given image. The design method is proposed with different sampling lattices. The important contribution of this paper lies in the fact that these filters are estimated from given image itself. Several design examples are presented to show the efficacy of the approach and also the ease of design. Since these wavelets are estimated from given image, thus they are called 2-D matched wavelets.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121453250","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
Frequency domain correction of residual frequency offset in OFDM and DMT systems OFDM和DMT系统中剩余频偏的频域校正
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458405
Ganesan Thiagarajaa, Manoj Kummini
{"title":"Frequency domain correction of residual frequency offset in OFDM and DMT systems","authors":"Ganesan Thiagarajaa, Manoj Kummini","doi":"10.1109/SPCOM.2004.1458405","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458405","url":null,"abstract":"OFDM and DMT systems are sensitive to carrier frequency offset between the receiver and transmitter. Most of the systems employ frequency offset estimation and correction, as a part of synchronizing the receiver to the transmitter. Depending on the availability of training data and/or the computation power, frequency offset may not be corrected exactly. Moreover, some times we may want to do the correction in the frequency domain in order to reduce the latency and complexity in the receiver. This paper discusses the frequency domain modeling of the effect of residual frequency offset as a linear transformation on the sub-carrier symbols. An interesting property is observed that the transformation matrix is Toeplitz and which simplifies the frequency correction circuit complexity. Simulation results are given to validate the algorithm.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124192441","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
An efficient implementation of turbo decoder on ADI TIGERSHARC TS201 DSP 在ADI TIGERSHARC TS201 DSP上高效实现turbo解码器
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458415
R. Kothandaraman, M.J. Lopez
{"title":"An efficient implementation of turbo decoder on ADI TIGERSHARC TS201 DSP","authors":"R. Kothandaraman, M.J. Lopez","doi":"10.1109/SPCOM.2004.1458415","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458415","url":null,"abstract":"This paper describes an efficient software implementation of the 3GPP turbo decoder on the ADI TS201 TigerSHARC DSP. The turbo decoder is implemented based on the sliding window Log-MAP algorithm and exploits the sub-word parallelism and single instruction multiple data (SIMD) architecture of the TS201 DSP to achieve high data rates (around 6 Mbps) that were previously achievable only in hardware.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"153 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117322965","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: 7
Compensation of narrowband interference in generalized discrete multitone modulation 广义离散多音调制中窄带干扰的补偿
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458345
N. Fliege, J. Schwartz
{"title":"Compensation of narrowband interference in generalized discrete multitone modulation","authors":"N. Fliege, J. Schwartz","doi":"10.1109/SPCOM.2004.1458345","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458345","url":null,"abstract":"The generalized DMT (GDMT) provides a low latency high data rate transmission over copper cables constituting a solution for many symmetrical data services up to 2 Mbps. The low latency is realized by a short FFT, short guard intervals and by compensating the remaining ISI/ICI by means of a special equalizer compensation (EC) matrix in the frequency domain. In this paper, a further useful application of the EC matrix is presented. Using the same matrix topology, we can show that narrowband interference, which is a severe problem in DMT and OFDM systems due to the limited selectivity of the FFT, can be nearly perfectly eliminated. The EC matrix possesses a sparse matrix topology and thus offers high spectral efficiency which is important for practical applications.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132100734","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
Modeling and simulation of radar sea clutter using K-distribution 基于k分布的雷达海杂波建模与仿真
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458425
A. Parthiban, J. Madhavan, P. Radhakrishna, D. Savitha, L. Sathish Kumar
{"title":"Modeling and simulation of radar sea clutter using K-distribution","authors":"A. Parthiban, J. Madhavan, P. Radhakrishna, D. Savitha, L. Sathish Kumar","doi":"10.1109/SPCOM.2004.1458425","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458425","url":null,"abstract":"Modern radars have become increasingly more complex and less tractable for mathematical analysis. So simulation is an obvious prerequisite if the radar is set to operate in hostile scenarios. The very commonly used and well established base band equivalent model for radar clutter is a complex Gaussian process, which implies that Chi-Square for power, or equivalently Rayleigh for amplitude. However, the statistical property of the radar cross-section on the area of sea surface is generally found to be non-Rayleigh. Also that the received clutter results from a large number of independent and identically distributed (IID) elementary scatterers does not hold good. In fact, if only a limited number of such scatterers actually contribute to the received clutter echo, as is the case for high resolution and/or low grazing angles, then the measured amplitude probability density function (APDF) exhibits large deviations from the Rayleigh distribution and is better fitted by families of APDFs such as K-distribution. This paper discusses the modeling and simulation of K-distributed sea clutter to help in understanding the clutter characteristics from a statistical viewpoint. This simulation will lead to a way of optimally fixing the threshold to improve detection performance.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"307 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132351376","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: 15
Efficient block matching algorithm for fast motion estimation in video compression 视频压缩中快速运动估计的高效块匹配算法
2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04. Pub Date : 2004-12-11 DOI: 10.1109/SPCOM.2004.1458406
M. Ezhilarasan, P. Thambidurai
{"title":"Efficient block matching algorithm for fast motion estimation in video compression","authors":"M. Ezhilarasan, P. Thambidurai","doi":"10.1109/SPCOM.2004.1458406","DOIUrl":"https://doi.org/10.1109/SPCOM.2004.1458406","url":null,"abstract":"Motion estimation is the most time-consuming module in any video coding standard. Existing block-matching algorithms (BMA) reduce the search time of the motion estimation process with moderate loss in quality. In this paper, a novel block-matching algorithm for fast motion estimation namely direct ion-based block-matching algorithm (DBM) is proposed. Existing BMA initiate its search from the center of the search area for every frame, which is time consuming. The proposed algorithm utilizes the temporal correlation in the motion vectors between successive frames to reduce the search time. The motion vectors of the previous frame imply the direction of motion in the succeeding frames thus minimizing the search domain. Experimental results show that DBM provides faster searching with moderate to low distortion compared to existing BMA.","PeriodicalId":424981,"journal":{"name":"2004 International Conference on Signal Processing and Communications, 2004. SPCOM '04.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117268343","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
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