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Estimating the dynamics of aberration components in the human eye 人眼像差分量的动态估计
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955267
D. R. Iskander, M. Morelande, M. Collins
{"title":"Estimating the dynamics of aberration components in the human eye","authors":"D. R. Iskander, M. Morelande, M. Collins","doi":"10.1109/SSP.2001.955267","DOIUrl":"https://doi.org/10.1109/SSP.2001.955267","url":null,"abstract":"To provide adequate information that would assist surgeons in performing advanced refractive corrections, it is essential to address the problem of microfluctuations in the eye's aberrations due to pulse and respiration. Although the effects of fluctuations in defocus are known and well described, very little is reported on modelling the fluctuations in other types of aberrations. We propose a methodology in which the dynamics of higher order aberration components are modelled by parametric AM-FM signals. Using our modelling approach, the effects of changes in these aberrations could be predicted and studied. In particular, we model the dynamics of components related to coma and spherical aberration. We provide a validation of the proposed modelling approach using aberration data from the eyes of six subjects.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"136 1","pages":"241-244"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86118802","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: 8
Score functions for locally subptimum and locally suboptimum rank detection in alpha-stable interference 稳定干扰下局部次优和局部次优秩检测的评分函数
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955221
C.L. Brown
{"title":"Score functions for locally subptimum and locally suboptimum rank detection in alpha-stable interference","authors":"C.L. Brown","doi":"10.1109/SSP.2001.955221","DOIUrl":"https://doi.org/10.1109/SSP.2001.955221","url":null,"abstract":"Approximations to the locally optimum and locally optimum rank score functions for the detection of a known signal in additive symmetric /spl alpha/ stable interference have been shown to introduce only slight performance loss. Here, the location of the apices of the nonlinearities is shown to follow an approximate linear relationship with the characteristic exponent, /spl alpha/, of the interference. The distribution of the corresponding test statistics is also found to be approximately Gaussian. These findings make implementation of the detectors more feasible and remove some expensive computational burden.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"43 1","pages":"58-61"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86169004","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
Robustness of the finite-length MMSE-DFE with respect to channel and second-order statistics estimation errors 有限长度MMSE-DFE对信道和二阶统计估计误差的鲁棒性
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955345
A. Liavas
{"title":"Robustness of the finite-length MMSE-DFE with respect to channel and second-order statistics estimation errors","authors":"A. Liavas","doi":"10.1109/SSP.2001.955345","DOIUrl":"https://doi.org/10.1109/SSP.2001.955345","url":null,"abstract":"The filters constituting the minimum mean square error decision-feedback equalizer (MMSE-DFE), as well as related performance measures, can be computed by assuming perfect knowledge of the channel impulse response and the input and noise second-order statistics (SOS). In practice, we estimate the unknown channel and SOS, and inevitable estimation errors arise. We model estimation errors as small perturbations, i.e., of order /spl epsiv/, with /spl epsiv/ a sufficiently small positive number, and we study the behavior of the MMSE-DFE under mismatch by performing a first-order perturbation analysis. We prove that the excess MSE induced by O(/spl epsiv/) estimation errors is O(/spl epsiv//sup 2/), uncovering important robustness properties associated with the MMSE-DFE.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"174 1","pages":"552-555"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87032223","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
On the application of model based distance metrics of signals for detection of brain injury 基于模型的信号距离度量在脑损伤检测中的应用
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955271
J. Paul, S. Tong, D. Sherman, Anastasios Bezerianos, N. Thakor
{"title":"On the application of model based distance metrics of signals for detection of brain injury","authors":"J. Paul, S. Tong, D. Sherman, Anastasios Bezerianos, N. Thakor","doi":"10.1109/SSP.2001.955271","DOIUrl":"https://doi.org/10.1109/SSP.2001.955271","url":null,"abstract":"In the basic and clinical research on brain's response to injury, electrical signals from the brain, namely EEG, is useful in providing an immediate signaling of the dysfunction. However, EEG signals have proven to be difficult to analyze and interpret due it its complex signal characteristic. There is a critical need for developing robust and reliable measures that can be correlated with injury as well as survival. In this paper, we address a unique problem of characterizing quantitatively the electrical measures of brain injury for analysis of brain activity in animal and human subjects. The key objective is to model EEG spectra and its features so that signaling changes due to injury can be discovered. We do so with the method of autoregressive modeling and dominant frequency analysis. The trends in the electrical signaling following injury and following resuscitation are modeled using the cepstral distance derived from the AR model.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"73 1","pages":"257-260"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90363498","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
The rejection Gibbs coupler: A perfect sampling algorithm and its application to truncated multivariate Gaussian distributions 抑制吉布斯耦合器:一种完美的抽样算法及其在截断多元高斯分布中的应用
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955217
Yufei Huang, T. Ghirmai, P. Djurić
{"title":"The rejection Gibbs coupler: A perfect sampling algorithm and its application to truncated multivariate Gaussian distributions","authors":"Yufei Huang, T. Ghirmai, P. Djurić","doi":"10.1109/SSP.2001.955217","DOIUrl":"https://doi.org/10.1109/SSP.2001.955217","url":null,"abstract":"A new Markov chain based algorithm for drawing samples from a desired distribution has been proposed. This algorithm, also known as the perfect sampling algorithm, can determine exactly when a Markov chain enters the equilibrium, and hence can output exact samples. We introduce a perfect sampling algorithm called the rejection Gibbs coupler for perfect sampling from bounded multivariate distributions. We demonstrate an application of the rejection coupler for generation of samples from truncated multivariate Gaussian distributions.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"50 1","pages":"42-45"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87574583","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
EEG brain map reconstruction using blind source separation 基于盲源分离的脑电图脑图重建
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955265
S. Sanei, A. R. Leyman
{"title":"EEG brain map reconstruction using blind source separation","authors":"S. Sanei, A. R. Leyman","doi":"10.1109/SSP.2001.955265","DOIUrl":"https://doi.org/10.1109/SSP.2001.955265","url":null,"abstract":"EEG-based brain maps are very useful in anatomical, functional and pathological diagnosis. These images are projections of the energy of the signals in four different frequency bands. Joint approximate diagonalization of eigenmatrices (JADE) is used as an effective tool in the deconvolution of EEG signals prior to spectrum estimation. The algorithm also, restores the noise from the signal as a result of higher order statistics (HOS) estimation. The spectrum is estimated using autoregressive (AR) modelling and pseudo-hot colours are used to represent brain activities. The results show a great enhancement in diagnostic features in the reconstructed images. The overall system also enables real-time reconstruction of the images for patient monitoring purposes.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"97 1","pages":"233-236"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72950659","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
Self-similar traffic sources: modeling and real-time resource allocation 自相似流量源:建模和实时资源分配
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955225
K. Nagarajan, G.T. Zhou
{"title":"Self-similar traffic sources: modeling and real-time resource allocation","authors":"K. Nagarajan, G.T. Zhou","doi":"10.1109/SSP.2001.955225","DOIUrl":"https://doi.org/10.1109/SSP.2001.955225","url":null,"abstract":"Communication networks have to rely on efficient resource allocation schemes to share the network resources (bandwidth, buffer size, etc.) among users offering different types of traffic (eg, voice, video and data). Existing schemes based on self-similar traffic models assume that the network traffic is Gaussian and exhibits long-term memory characteristics only. Certain classes of network traffic (eg, MPEG video traces) are however, non-Gaussian and long-range-dependent. In such cases, resource allocation based on simplified assumptions will be either excessive or fail to provide the specified guarantees on the quality of service (QoS). In an earlier work, we had presented an efficient resource allocation scheme for traffic sources having: (i) Gaussian as well as non-Gaussian (log-normal) distributions; and (ii) exhibiting short-term and/or long-term memory characteristics. In this paper, we assess the real-time performance of our as well as several existing schemes using a Texas Instruments TMS320C6701 DSP. The results show that: (i) although our algorithm has a higher computational load, real-time implementation is still feasible; and (ii) the increased computational load is justified since the proposed algorithm is more reliable in providing QoS guarantees than existing simplified schemes.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"29 1","pages":"74-77"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76677348","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
An efficient Hilbert transform interpolation algorithm for peak position estimation 峰值位置估计的Hilbert变换插值算法
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955311
S. S. Abeysekera
{"title":"An efficient Hilbert transform interpolation algorithm for peak position estimation","authors":"S. S. Abeysekera","doi":"10.1109/SSP.2001.955311","DOIUrl":"https://doi.org/10.1109/SSP.2001.955311","url":null,"abstract":"An efficient algorithm for estimating the peak position of a sampled function is presented. The algorithm uses the Hilbert transform of the function for peak detection via interpolation. The accuracy of the proposed method is demonstrated using an example where the frequency of a sinusoid is determined by detecting the peak of the FFT of the signal. It is shown that the algorithm has computational advantage when the positions of many peaks of the sampled function are required to be estimated, e.g. as in the fundamental and harmonic frequency estimation of an audio signal. Spectral characteristics of the Hilbert transform amplitude and phase functions and the rationale for the use of Hilbert transform for interpolation are also discussed in detail.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"33 1","pages":"417-420"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76896983","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
Recursive Bayesian phase estimation in ranging and mobile communication 递归贝叶斯相位估计在测距和移动通信中的应用
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955257
J. Leitao, F. Sousa
{"title":"Recursive Bayesian phase estimation in ranging and mobile communication","authors":"J. Leitao, F. Sousa","doi":"10.1109/SSP.2001.955257","DOIUrl":"https://doi.org/10.1109/SSP.2001.955257","url":null,"abstract":"Mobile radio communication systems are generally designed without taking into account the relative emitter/receiver dynamics. In this paper we model this dynamics as a vector Markov process and formulate ranging and digital demodulation/detection as aspects of recursive absolute (not modulo 2/spl pi/) phase estimation. Symbol-by-symbol detection and phase tracking within symbol interval are performed by a bank of 'matched' stochastic nonlinear estimators and a maximum a posteriori (MAP) decision algorithm. The approach applies to precision landing and communication with low Earth orbit (LEO) satellites or between rapid maneuvering platforms.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"16 1","pages":"202-205"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82982782","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
A study of time-frequency based detectors for FSK modulated signals in a flat fading channel 平坦衰落信道中FSK调制信号时频检测器的研究
信号处理 Pub Date : 2001-08-06 DOI: 10.1109/SSP.2001.955258
B. Barkat, S. Attallah
{"title":"A study of time-frequency based detectors for FSK modulated signals in a flat fading channel","authors":"B. Barkat, S. Attallah","doi":"10.1109/SSP.2001.955258","DOIUrl":"https://doi.org/10.1109/SSP.2001.955258","url":null,"abstract":"We address the problem of channel fading in communication systems. In particular, we focus on the flat fading phenomenon. We study some time-frequency based techniques for the detection of frequency modulated signals subjected to flat fading channels. A comparison, based on the bit error rate, of these techniques is also presented.","PeriodicalId":70952,"journal":{"name":"信号处理","volume":"4 1","pages":"206-209"},"PeriodicalIF":0.0,"publicationDate":"2001-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87982409","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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