Pub Date : 1900-01-01DOI: 10.1109/ISSPA.2001.949768
A. P. Vinod, A. Premkumar, C. Lau
The weighted least squares (WLS) algorithm is widely employed for designing quadrature mirror filters (QMF) in the frequency domain. The equiripple nature of the WLS design and its performance near the filter band edge have been reported to be better than that of the least squares (LS) design. It is known that these design techniques suffer from pass-band anomaly under different stop band frequencies. We have proposed an algorithm to eliminate pass-band anomaly of LS design. In this paper, we show that WLS can be modified in way similar to that proposed for the LS design. The characteristics of the resulting filters satisfy the stop band requirements and do not show anomaly in the pass band region.
{"title":"Novel approach to the design of weighted minimax quadrature mirror filters","authors":"A. P. Vinod, A. Premkumar, C. Lau","doi":"10.1109/ISSPA.2001.949768","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949768","url":null,"abstract":"The weighted least squares (WLS) algorithm is widely employed for designing quadrature mirror filters (QMF) in the frequency domain. The equiripple nature of the WLS design and its performance near the filter band edge have been reported to be better than that of the least squares (LS) design. It is known that these design techniques suffer from pass-band anomaly under different stop band frequencies. We have proposed an algorithm to eliminate pass-band anomaly of LS design. In this paper, we show that WLS can be modified in way similar to that proposed for the LS design. The characteristics of the resulting filters satisfy the stop band requirements and do not show anomaly in the pass band region.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"104 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":"132850813","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949782
Anjum Ali
This paper discusses sub-cycles in a pseudo-random sequence of arrays (PRSA). Sub-cycles are generated by using a linear feedback shift register with a non-primitive characteristic polynomial in the core of the PRSA generator. Some properties of the sub-cycles are stated and proved. Examples are used to further clarify the ideas presented. Computer-generated results are also included.
{"title":"A study of PRSA sub-cycles","authors":"Anjum Ali","doi":"10.1109/ISSPA.2001.949782","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949782","url":null,"abstract":"This paper discusses sub-cycles in a pseudo-random sequence of arrays (PRSA). Sub-cycles are generated by using a linear feedback shift register with a non-primitive characteristic polynomial in the core of the PRSA generator. Some properties of the sub-cycles are stated and proved. Examples are used to further clarify the ideas presented. Computer-generated results are also included.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"22 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":"133179512","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949767
R. Aldhaheri, Ameen S. Al-Moshadak
A new technique is presented to design quadrantally symmetric 2-D IIR filters. This technique is based on two steps: first, the 2-D impulse response matrix (Hankel matrix) is decomposed by the SVD (singular value decomposition) to k parallel branches, each branch is composed of two cascaded single-input single-output (SISO) 1-D FIR filters. Second, a truncated model reduction algorithm is applied to the 1-D filters to approximate the N/sub l/-dimensional FIR into n/sub l/-dimensional IIR filters, where. n/sub l/
{"title":"Design of 2-D quadrantally symmetric IIR digital filter using singular value decomposition and ordered real Schur form","authors":"R. Aldhaheri, Ameen S. Al-Moshadak","doi":"10.1109/ISSPA.2001.949767","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949767","url":null,"abstract":"A new technique is presented to design quadrantally symmetric 2-D IIR filters. This technique is based on two steps: first, the 2-D impulse response matrix (Hankel matrix) is decomposed by the SVD (singular value decomposition) to k parallel branches, each branch is composed of two cascaded single-input single-output (SISO) 1-D FIR filters. Second, a truncated model reduction algorithm is applied to the 1-D filters to approximate the N/sub l/-dimensional FIR into n/sub l/-dimensional IIR filters, where. n/sub l/<N/sub l/, l=1,2. The transformation that converts the FIR to IIR filters is obtained by finding the eigenspace associated with the large eigenvalues of the cross-gramian matrix W/sub co/ using the ordered real Schur form decomposition. Examples are given to illustrate the proposed technique.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"65 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":"130233211","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.950165
M. Bugallo, J. Míguez, L. Castedo
This paper addresses the problem of blind multiple access interference (MAI) and intersymbol interference (ISI) suppression in direct sequence code division multiple access (DS-CDMA) systems. In order to take advantage of the diversity inherent to multipath channels, we introduce a blind RAKE multiuser receiver that proceeds in two steps. First, soft estimates of the desired user transmitted symbols are obtained from each propagation path using a bank of appropriate linearly constrained maximum likelihood linear (LCMLL) receivers. Afterwards, these estimates are adequately combined to enhance the signal to interference and noise ratio (SINR).
{"title":"A novel blind diversity combining receiver for CDMA systems","authors":"M. Bugallo, J. Míguez, L. Castedo","doi":"10.1109/ISSPA.2001.950165","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.950165","url":null,"abstract":"This paper addresses the problem of blind multiple access interference (MAI) and intersymbol interference (ISI) suppression in direct sequence code division multiple access (DS-CDMA) systems. In order to take advantage of the diversity inherent to multipath channels, we introduce a blind RAKE multiuser receiver that proceeds in two steps. First, soft estimates of the desired user transmitted symbols are obtained from each propagation path using a bank of appropriate linearly constrained maximum likelihood linear (LCMLL) receivers. Afterwards, these estimates are adequately combined to enhance the signal to interference and noise ratio (SINR).","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"146 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":"114634494","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949828
K. Diamantaras
We propose a novel geometric blind identification method based on the structure of the data constellation created from the output of an ISI-corrupted channel transmitting an M-ary PAM coded source. We formally establish that, in the absence of noise and under certain identification conditions, the covex hull of the constellation contains information sufficient for recovering the channel uniquely (up to the sign). In the noisy case the method must be preceeded by an unsupervised clustering procedure. Contrary to HOS- or SOS-based methods our approach is finite and does not require neither spatial nor temporal diversity. On the negative side, the complexity is higher than exponential with respect to the channel length and so the method is more suitable for short channels.
我们提出了一种新的几何盲识别方法，该方法基于由传输m - mary PAM编码源的isi损坏信道输出产生的数据星座结构。我们正式确定，在没有噪声和某些识别条件下，星座的凸壳包含足够的信息来唯一地恢复信道(直到标志)。在有噪声的情况下，该方法必须先进行无监督聚类过程。与基于居屋计划或sos的方法相反，我们的方法是有限的，既不需要空间也不需要时间的多样性。在消极方面，复杂度相对于信道长度高于指数，因此该方法更适合于短信道。
{"title":"Blind identification of linear channels using the data constellation geometry","authors":"K. Diamantaras","doi":"10.1109/ISSPA.2001.949828","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949828","url":null,"abstract":"We propose a novel geometric blind identification method based on the structure of the data constellation created from the output of an ISI-corrupted channel transmitting an M-ary PAM coded source. We formally establish that, in the absence of noise and under certain identification conditions, the covex hull of the constellation contains information sufficient for recovering the channel uniquely (up to the sign). In the noisy case the method must be preceeded by an unsupervised clustering procedure. Contrary to HOS- or SOS-based methods our approach is finite and does not require neither spatial nor temporal diversity. On the negative side, the complexity is higher than exponential with respect to the channel length and so the method is more suitable for short channels.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"9 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":"132226942","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949824
A.Z. bin Sha'ameri
Time-frequency analysis is used to analyze digital modulation signals such as FSK (frequency shift-keying) and ASK (amplitude shift-keying) in HF (high frequency) radio communications. A new time-frequency distribution, the lag-windowed Wigner-Ville distribution (LWWVD), improves the time-frequency representation by minimizing the interference terms due to the cross-term. Comparisons are made with the conventional Wigner-Ville distribution (WVD), reduced interference distributions (RID) and other related methods, based on the criteria of the mainlobe width and the signal-to-interference ratio. Consistently, the LWWVD gives the most accurate time-frequency representation for ASK and FSK signals.
{"title":"Analysis of HF data communication signals using the lag-windowed Wigner-Ville distribution","authors":"A.Z. bin Sha'ameri","doi":"10.1109/ISSPA.2001.949824","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949824","url":null,"abstract":"Time-frequency analysis is used to analyze digital modulation signals such as FSK (frequency shift-keying) and ASK (amplitude shift-keying) in HF (high frequency) radio communications. A new time-frequency distribution, the lag-windowed Wigner-Ville distribution (LWWVD), improves the time-frequency representation by minimizing the interference terms due to the cross-term. Comparisons are made with the conventional Wigner-Ville distribution (WVD), reduced interference distributions (RID) and other related methods, based on the criteria of the mainlobe width and the signal-to-interference ratio. Consistently, the LWWVD gives the most accurate time-frequency representation for ASK and FSK signals.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"65 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":"133708667","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949807
W. Heng, K. Ngan
Shot boundary refinement is the first stage of long transition analysis. Its purpose is to extract the exact transition start and end in a video sequence. This is done by first constructing a reference indicator and then picking up the sharp gradient changes within such an indicator. The parameter used in constructing the reference indicator can vary, and different features can be used, with reference frames set at different positions. This paper examines the effect of varying these parameters, and its implication when applied to transitions with different special effects.
{"title":"Examination of features used for reference indicator construction in shot boundary refinement","authors":"W. Heng, K. Ngan","doi":"10.1109/ISSPA.2001.949807","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949807","url":null,"abstract":"Shot boundary refinement is the first stage of long transition analysis. Its purpose is to extract the exact transition start and end in a video sequence. This is done by first constructing a reference indicator and then picking up the sharp gradient changes within such an indicator. The parameter used in constructing the reference indicator can vary, and different features can be used, with reference frames set at different positions. This paper examines the effect of varying these parameters, and its implication when applied to transitions with different special effects.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"451 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":"133400932","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949821
A. Bousbia-Salah, A. Belouchrani, A. Cichocki
This paper deals with the problem of independent component analysis of ECG signals. We propose to exploit the time frequency information present in the ECG signals. Existing approaches use only high and second order statistics to separate such kinds of signals. We investigate the application of time-frequency tools to perform the same task. This approach seems for us natural since the ECG signals show a special structure in the time-frequency domain of which we take advantage in our proposed analysis. This time-frequency analysis can contributes in the decision making of medical diagnoses. We propose to separate a combination of mother ECG signals and weak fetus ECG signals. Experimental results are reported and compared to results obtained with a higher order statistic method.
{"title":"Application of time-frequency distributions to the independent component analysis of ECG signals","authors":"A. Bousbia-Salah, A. Belouchrani, A. Cichocki","doi":"10.1109/ISSPA.2001.949821","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949821","url":null,"abstract":"This paper deals with the problem of independent component analysis of ECG signals. We propose to exploit the time frequency information present in the ECG signals. Existing approaches use only high and second order statistics to separate such kinds of signals. We investigate the application of time-frequency tools to perform the same task. This approach seems for us natural since the ECG signals show a special structure in the time-frequency domain of which we take advantage in our proposed analysis. This time-frequency analysis can contributes in the decision making of medical diagnoses. We propose to separate a combination of mother ECG signals and weak fetus ECG signals. Experimental results are reported and compared to results obtained with a higher order statistic method.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"456 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":"126965078","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.950202
M. Ashourian, Z. M. Yusof, S. Salleh, S. Abu-Bakar
We explain our results on development of a robust video coder, The coder consists of 3D subband filtering in the first stage, an optimized scalar quantization (SQ) of lowest tempo-spatial frequency subband, and a pyramid vector quantization (PVQ) for high frequency subbands. To increase robustness to noise productive enumeration is used for PVQ. Also with phase scrambling the distribution of the lowest temporal-spatial band is changed to Gaussian which results in a better SQ coding gain for this band. The output indices of SQ were sent using a folded binary code to improve noise robustness. Results show that at high bit-error rate (5/spl times/10/sup -3/) the coder peak signal to noise ratio drops a maximum 5.3 dB.
{"title":"Robust 3-D subband video coder","authors":"M. Ashourian, Z. M. Yusof, S. Salleh, S. Abu-Bakar","doi":"10.1109/ISSPA.2001.950202","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.950202","url":null,"abstract":"We explain our results on development of a robust video coder, The coder consists of 3D subband filtering in the first stage, an optimized scalar quantization (SQ) of lowest tempo-spatial frequency subband, and a pyramid vector quantization (PVQ) for high frequency subbands. To increase robustness to noise productive enumeration is used for PVQ. Also with phase scrambling the distribution of the lowest temporal-spatial band is changed to Gaussian which results in a better SQ coding gain for this band. The output indices of SQ were sent using a folded binary code to improve noise robustness. Results show that at high bit-error rate (5/spl times/10/sup -3/) the coder peak signal to noise ratio drops a maximum 5.3 dB.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"51 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":"122135970","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 : 1900-01-01DOI: 10.1109/ISSPA.2001.949809
Thorsten Maucher, K. Meier, J. Schemmel
We have built and operated an interactive tactile graphics display based on 48 piezoelectric actuators assembled in a movable tactile output unit. The unit can be positioned at any location on a two dimensional surface to explore the structure of a virtual image. The virtual tactile display (VTD) can receive data either from a camera system or from a data base on a computer. Both static and dynamic patterns can be displayed. The maximum refresh rate of the tactile image is 20 Hz. This paper covers the technical description of an improved version of the virtual tactile display which takes into account all experience gained with an initial prototype. A short overview of the results obtained in tests done with 6 blind and 4 sighted subjects using the initial prototype shows the capacity of the underlying concept.
{"title":"An interactive tactile graphics display","authors":"Thorsten Maucher, K. Meier, J. Schemmel","doi":"10.1109/ISSPA.2001.949809","DOIUrl":"https://doi.org/10.1109/ISSPA.2001.949809","url":null,"abstract":"We have built and operated an interactive tactile graphics display based on 48 piezoelectric actuators assembled in a movable tactile output unit. The unit can be positioned at any location on a two dimensional surface to explore the structure of a virtual image. The virtual tactile display (VTD) can receive data either from a camera system or from a data base on a computer. Both static and dynamic patterns can be displayed. The maximum refresh rate of the tactile image is 20 Hz. This paper covers the technical description of an improved version of the virtual tactile display which takes into account all experience gained with an initial prototype. A short overview of the results obtained in tests done with 6 blind and 4 sighted subjects using the initial prototype shows the capacity of the underlying concept.","PeriodicalId":236050,"journal":{"name":"Proceedings of the Sixth International Symposium on Signal Processing and its Applications (Cat.No.01EX467)","volume":"569 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":"126045683","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}
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