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ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)最新文献

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Impact of wireless access on traffic statistics 无线接入对流量统计的影响
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.818103
A. Qureshi
{"title":"Impact of wireless access on traffic statistics","authors":"A. Qureshi","doi":"10.1109/ISSPA.1999.818103","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.818103","url":null,"abstract":"This paper is concerned with wideband, multimedia packet switched wireless data networks. It considers the impact of a wireless access TDMA source queue on long range dependence (LRD) in traffic statistics. Simulation results show that traffic LRD is typically retained at the output of such queues. These results point to important implications for wireless network resource allocation and traffic management.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115426174","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
Performance analysis of normalized least mean p-norm lattice algorithm for alpha-stable processes 稳定过程归一化最小均值p-范数格算法的性能分析
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.818193
M. Kahaei, B. Boashash, Mohamed Deriche
{"title":"Performance analysis of normalized least mean p-norm lattice algorithm for alpha-stable processes","authors":"M. Kahaei, B. Boashash, Mohamed Deriche","doi":"10.1109/ISSPA.1999.818193","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.818193","url":null,"abstract":"The existence of impulsive noise with /spl alpha/-stable distributions has been addressed in many applications. We present two new adaptive algorithms using the lattice structure for /spl alpha/-stable processes. In these algorithms fractional lower order moments of residual errors are used to update the filter coefficients. Based on the empirical results, the proposed algorithms show superior convergence speed over presently available techniques in parameter estimation of /spl alpha/-stable processes. The problem of misalignment of the mean of the estimated parameters with respect to the true values is also addressed.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123360108","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
Representing and identifying jointed objects using a multiresolution technique 使用多分辨率技术表示和识别有关节的对象
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.818212
W. Boles
{"title":"Representing and identifying jointed objects using a multiresolution technique","authors":"W. Boles","doi":"10.1109/ISSPA.1999.818212","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.818212","url":null,"abstract":"A multiresolution technique for representing and identifying objects in images is presented. Images are pre processed to extract object contours. Extracted contours are parameterised to form 1-D arrays. Object representations are then constructed as sets of contour waveforms viewed at different resolution levels. In the learning phase of the proposed algorithm, a database of object models is constructed which representations of objects obtained form images. The database includes jointed objects defined as those consisting of more than one part. During the object identification phase, object parts are allowed to be moved in the plane perpendicular to the joint's axil. To make the algorithm fast and efficient, only a subset of the representation points is used for object identification. The performance of the proposed algorithm is investigated under shifts, rotations, and scale changes.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123733678","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
A high performance Mandarin digit recognizer 一个高性能的中文数字识别器
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.815751
Zan Bo, Liu Juan, Gang Peng, William S-Y. Wang
{"title":"A high performance Mandarin digit recognizer","authors":"Zan Bo, Liu Juan, Gang Peng, William S-Y. Wang","doi":"10.1109/ISSPA.1999.815751","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.815751","url":null,"abstract":"Digit recognition is important in some applications such as automated banking systems or database information retrieving systems. To design a high performance Mandarin digit recognizer, a Mandarin phonetic question set was first carefully designed and then used to cluster 846 gender dependent cross word triphones. To model the fine differences in high frequency region of Mandarin initials, inverse mel-frequency warping was used to calculate the IMFCC feature. The IMFCC feature was shown to be quite effective in recovering the substitution errors caused by similarity of the Mandarin initials. Combined with triphone duration modeling, the recognizer produced 98.81% word accuracy rate and 95.20% sentence correct rate.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121074473","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
Frequency shift dither for analogue to digital converters 模拟数字转换器的频移抖动
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.815775
C. Kikkert, A. Bigdeli
{"title":"Frequency shift dither for analogue to digital converters","authors":"C. Kikkert, A. Bigdeli","doi":"10.1109/ISSPA.1999.815775","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.815775","url":null,"abstract":"This paper discusses a new dither technique to linearise an analogue to digital converter (ADC). This typically results in a more than 20 dB reduction in harmonic distortion. Additive dither has been demonstrated to reduce the spurii to a significant extent. In this paper frequency shift (FS) dither is described. FS dither applies a frequency shift to the signals to be digitised. After analogue to digital conversion the signal is demodulated by removing this frequency shift using digital signal processing (DSP) techniques. FS dither has the advantage that the demodulated output has very low levels of harmonic distortion compared to a system without FS dither. By applying both additive and FS dither at the same time, input signals with amplitudes far less than a quantum level can be digitised and detected accurately.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126279843","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
Adaptive IIR filtering for noisy input-output systems 噪声输入输出系统的自适应IIR滤波
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.818190
W. Zheng
{"title":"Adaptive IIR filtering for noisy input-output systems","authors":"W. Zheng","doi":"10.1109/ISSPA.1999.818190","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.818190","url":null,"abstract":"This paper is concerned with adaptive IIR filtering for linear systems with noisy input and output measurements. A new and numerically efficient procedure for estimating the variances of the white input and output noises is established so that the adaptive IIR filter based on the bias-eliminated least-squares algorithm can be efficiently implemented. This new adaptive IIR filter can achieve a substantial reduction in computational effort, and can retain almost the same parameter estimation accuracy. Numerical results that illustrate the attractive properties of the new adaptive FIR filter are presented.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129711264","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
Transmission of still images over noisy channels 在噪声信道上传输静止图像
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.815790
A. Perkis, Daniel Gonzalo Cardelo
{"title":"Transmission of still images over noisy channels","authors":"A. Perkis, Daniel Gonzalo Cardelo","doi":"10.1109/ISSPA.1999.815790","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.815790","url":null,"abstract":"This paper presents the importance of error resilience in still image coding in order to be able to transmit images over noisy channels. The motivation for error resilience is described as well as a presentation of the ongoing work on error resilience in the standardising of the next generation still image compression system, JPEG2000. As a case study we focus on some theoretical results obtained comparing the tradeoffs between re-transmission time, bit error rate (BER) and quality for typical mobile and wireless applications, showing the benefits of having an error resilient mode.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128278693","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: 5
Instability in DOA manifold ambiguity resolution DOA歧义解算中的不稳定性
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.815815
Y. Abramovich, N. Spencer, V. Gaitsgory
{"title":"Instability in DOA manifold ambiguity resolution","authors":"Y. Abramovich, N. Spencer, V. Gaitsgory","doi":"10.1109/ISSPA.1999.815815","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.815815","url":null,"abstract":"We discuss the instability conditions of direction-of-arrival (DOA) manifold ambiguity resolution for uncorrelated Gaussian sources and nonuniform linear antenna arrays. Manifold ambiguity is associated with linear dependence amongst the points on the array manifold (the \"steering vectors\") where the number of sources is less than the number of sensors, or in the more general case, amongst the points on the co-array manifold. In our previous papers, we have demonstrated that such ambiguity renders subspace-based DOA estimation techniques (such as MUSIC) useless, but does not necessarily imply that the scenario is nonidentifiable. In those identifiable cases of manifold ambiguity, we have proposed a new fitting algorithm to identify the true DOAs from the superset of ambiguous DOA estimates generated by MUSIC. In this paper, we present analytic evidence that the stochastic stability of this identification technique (with respect to the finite sample size) depends on the precise scenario parameters, and may become unstable. We present simulation results that support the analytic predictions.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115959795","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
Beamforming for a source located in the interior of a sensor array 位于传感器阵列内部的源的波束形成
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.815810
D. Ward, R. C. Williamson
{"title":"Beamforming for a source located in the interior of a sensor array","authors":"D. Ward, R. C. Williamson","doi":"10.1109/ISSPA.1999.815810","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.815810","url":null,"abstract":"We introduce a framework for acquiring a signal from a source that is located within the midst of a randomly distributed sensor array. This problem arises in speech acquisition with microphone arrays. Based on psychoacoustic considerations, we formulate a constrained optimization problem in which the array weights are chosen to minimize the response to farfield sources while maintaining a unity-gain constraint for the source signal.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121008903","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
Demodulating binary phase shift keyed signals using programmable logic devices 用可编程逻辑器件解调二进制相移键控信号
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359) Pub Date : 1999-08-22 DOI: 10.1109/ISSPA.1999.815765
C. Kikkert, Craig Blackburn
{"title":"Demodulating binary phase shift keyed signals using programmable logic devices","authors":"C. Kikkert, Craig Blackburn","doi":"10.1109/ISSPA.1999.815765","DOIUrl":"https://doi.org/10.1109/ISSPA.1999.815765","url":null,"abstract":"This paper describes the realisation of a differential BPSK demodulator using a high speed ADC, an EPLD and an EPROM. By incorporating both I and Q data in the demodulation process, a significant improvement in performance is obtained. Computer simulation shows the bit error rate (BER) performance versus received carrier to noise ratio (CNR) is virtually identical to the theoretical performance of a differential phase shift keyed (DPSK) detector. The realisation of the special PLL required, to recover the data clock using an EPLD, a DAC, a conventional loop filter and VCO is described.","PeriodicalId":302569,"journal":{"name":"ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125505291","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
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