Pub Date : 2005-12-06DOI: 10.1109/ICICS.2005.1689266
Haoyang Li, Lanlan Chang, Yap-Peng Tan
Demosaicking process is generally performed to reconstruct full color images from color filter array samples acquired by digital cameras. Over the past recent years, a large number of demosaicking algorithms have been proposed in the literature. When comparing the performances of different demosaicking algorithms, some existing work might use different experimental settings and test images. The objective of this paper is to show that different experimental settings and test images could affect the comparison results substantially. In particular, a series of experiments have been conducted to examine and demonstrate the effects of three experimental settings-CFA arrangement, image size, and image luminance-on demosaicking performance. It is advocated that for a fair comparison of different demosaicking algorithms, these performance factors should be taken into consideration
{"title":"Performance Factors for Evaluating Color Filter Array Demosaicking Algorithms","authors":"Haoyang Li, Lanlan Chang, Yap-Peng Tan","doi":"10.1109/ICICS.2005.1689266","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689266","url":null,"abstract":"Demosaicking process is generally performed to reconstruct full color images from color filter array samples acquired by digital cameras. Over the past recent years, a large number of demosaicking algorithms have been proposed in the literature. When comparing the performances of different demosaicking algorithms, some existing work might use different experimental settings and test images. The objective of this paper is to show that different experimental settings and test images could affect the comparison results substantially. In particular, a series of experiments have been conducted to examine and demonstrate the effects of three experimental settings-CFA arrangement, image size, and image luminance-on demosaicking performance. It is advocated that for a fair comparison of different demosaicking algorithms, these performance factors should be taken into consideration","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114217214","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689117
Lianggui Liu, G. Feng
Ant based routing protocols for MANETs have been widely explored, but most of them are essentially of single-path which tends to have heavy burden on the hosts along the shortest path from source to destination. The robustness of these protocols is comparatively not good which is further weakened by the positive feedback mechanism of ant. Node-disjoint multi-path routing is more robust and can support QoS better than single-path routing in MANETs. In this paper we combine swarm intelligence and node-disjoint multi-path routing to solve the problem mentioned above. A novel approach named Ant colony based Multi-path Routing (AMR) is proposed. AMR establishes and utilizes multiple routes of node-disjoint paths to send data packets concurrently and adopts pheromone to disperse communication traffic, thus it can adapt to the dynamic changes of the network and support QoS better. The simulation results show that the proposed approach outperforms other pertinent algorithms
{"title":"Swarm Intelligence Based Node-disjoint Multi-path Routing Protocol for Mobile Ad Hoc Networks","authors":"Lianggui Liu, G. Feng","doi":"10.1109/ICICS.2005.1689117","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689117","url":null,"abstract":"Ant based routing protocols for MANETs have been widely explored, but most of them are essentially of single-path which tends to have heavy burden on the hosts along the shortest path from source to destination. The robustness of these protocols is comparatively not good which is further weakened by the positive feedback mechanism of ant. Node-disjoint multi-path routing is more robust and can support QoS better than single-path routing in MANETs. In this paper we combine swarm intelligence and node-disjoint multi-path routing to solve the problem mentioned above. A novel approach named Ant colony based Multi-path Routing (AMR) is proposed. AMR establishes and utilizes multiple routes of node-disjoint paths to send data packets concurrently and adopts pheromone to disperse communication traffic, thus it can adapt to the dynamic changes of the network and support QoS better. The simulation results show that the proposed approach outperforms other pertinent algorithms","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122409511","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689306
N. Benvenuto, G. Carnevale, S. Tomasin
In an uplink CDMA transmission, we consider a base station that utilizes successive interference cancellation (SIC) and performs power control of the mobile terminals to minimize the system power. Since the joint optimization of power control and ordering (JOPCO) detection in SIC requires a computational effort that grows exponentially with the number of active users, in this paper we propose an approximated solution obtained by modelling JOPCO as a discrete stochastic optimization problem. The proposed algorithm is based on the construction of a Markov chain whose states are the orderings. Moreover, in order to further reduce complexity, an efficient description of the state probabilities is derived. Simulations performed on an UMTS scenario show that the proposed technique yields a performance close to the optimal JOPCO solution
{"title":"Optimization of SIC Receiver and CDMA Power Control by Discrete Stochastic Approximation","authors":"N. Benvenuto, G. Carnevale, S. Tomasin","doi":"10.1109/ICICS.2005.1689306","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689306","url":null,"abstract":"In an uplink CDMA transmission, we consider a base station that utilizes successive interference cancellation (SIC) and performs power control of the mobile terminals to minimize the system power. Since the joint optimization of power control and ordering (JOPCO) detection in SIC requires a computational effort that grows exponentially with the number of active users, in this paper we propose an approximated solution obtained by modelling JOPCO as a discrete stochastic optimization problem. The proposed algorithm is based on the construction of a Markov chain whose states are the orderings. Moreover, in order to further reduce complexity, an efficient description of the state probabilities is derived. Simulations performed on an UMTS scenario show that the proposed technique yields a performance close to the optimal JOPCO solution","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122633715","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689124
Z. Gu, S. Xie, S. Rahardja, E. T. Sze, Y. Xin
The bit error rate (BER) performance of various spreading sequences in a synchronous multicarrier code-division multiple access (MC-CDMA) system is compared by numerical simulations in this paper. The underlying subcarriers are correlated. Gold, orthogonal Gold, 4-phase family A, Walsh-Hadamard (WH) and new orthogonal unified complex Hadamard transform (UCHT) sequences are investigated here. Simulation results show that both orthogonal WH and UCHT sequences give the best BER performance among various spreading sequences. The disparity in performance between the various spreading sequences can be explained by the property of the zero-delay cross-correlation in frequency domain
{"title":"Performance Comparison of Spreading Sequences in Synchronous MC-CDMA Systems","authors":"Z. Gu, S. Xie, S. Rahardja, E. T. Sze, Y. Xin","doi":"10.1109/ICICS.2005.1689124","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689124","url":null,"abstract":"The bit error rate (BER) performance of various spreading sequences in a synchronous multicarrier code-division multiple access (MC-CDMA) system is compared by numerical simulations in this paper. The underlying subcarriers are correlated. Gold, orthogonal Gold, 4-phase family A, Walsh-Hadamard (WH) and new orthogonal unified complex Hadamard transform (UCHT) sequences are investigated here. Simulation results show that both orthogonal WH and UCHT sequences give the best BER performance among various spreading sequences. The disparity in performance between the various spreading sequences can be explained by the property of the zero-delay cross-correlation in frequency domain","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126177776","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689221
C. Jiang, I.T. Ong, Y.H. Lee
In this paper, the relationship between the rainfall rate statistics from the Doppler radar system and the one minute integration time rain distributions from a rain gauge network was studied. With these investigations, a simple framework of converting the radar rainfall rate statistics to its equivalent one minute rain rates was suggested. The prediction results were evaluated, and good agreement with the measured data was observed
{"title":"Relationship between Doppler Radar Data and Point Rainfall Rate","authors":"C. Jiang, I.T. Ong, Y.H. Lee","doi":"10.1109/ICICS.2005.1689221","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689221","url":null,"abstract":"In this paper, the relationship between the rainfall rate statistics from the Doppler radar system and the one minute integration time rain distributions from a rain gauge network was studied. With these investigations, a simple framework of converting the radar rainfall rate statistics to its equivalent one minute rain rates was suggested. The prediction results were evaluated, and good agreement with the measured data was observed","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122492047","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1688992
K. Yamamoto, A. Kusuda, S. Yoshida
We attempt to analytically formulate the spectral efficiency and outage probability of multihop cellular systems, in which mobile stations and base stations can communicate by using multihop relaying. This multihop relaying has the same ability as symbol rate control to enhance the end-to-end communication range at the loss of spectral efficiency. According to this commonality, a similar methodology to formulate the performance of rate-adaptive cellular systems is used. Numerical results reveal that multihop relaying is superior to symbol rate control in terms of both coverage and spectral efficiency
{"title":"Performance Evaluation of Multihop Cellular Systems and Rate Adaptive Cellular Systems","authors":"K. Yamamoto, A. Kusuda, S. Yoshida","doi":"10.1109/ICICS.2005.1688992","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1688992","url":null,"abstract":"We attempt to analytically formulate the spectral efficiency and outage probability of multihop cellular systems, in which mobile stations and base stations can communicate by using multihop relaying. This multihop relaying has the same ability as symbol rate control to enhance the end-to-end communication range at the loss of spectral efficiency. According to this commonality, a similar methodology to formulate the performance of rate-adaptive cellular systems is used. Numerical results reveal that multihop relaying is superior to symbol rate control in terms of both coverage and spectral efficiency","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124017081","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689219
M. Yang, G. Leedham, C. Higgins, S. M. Htwe
Pitman shorthand has been shown to possess unique advantages as a means of fast text entry on hand-held devices. Based on previous academic achievements, this paper discusses critical issues in the commercialization of Pitman shorthand online reorganization system from the technological perspective. In this paper, critical technological issues are classified into two aspects. These critical issues are illustrated by an entire online simulating system which realizes all core functions from input, through segmentation, recognition to transcription of Pitman shorthand
{"title":"Critical Technological Issues of Commercializing a Pitman Shorthand Recognition System","authors":"M. Yang, G. Leedham, C. Higgins, S. M. Htwe","doi":"10.1109/ICICS.2005.1689219","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689219","url":null,"abstract":"Pitman shorthand has been shown to possess unique advantages as a means of fast text entry on hand-held devices. Based on previous academic achievements, this paper discusses critical issues in the commercialization of Pitman shorthand online reorganization system from the technological perspective. In this paper, critical technological issues are classified into two aspects. These critical issues are illustrated by an entire online simulating system which realizes all core functions from input, through segmentation, recognition to transcription of Pitman shorthand","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121249465","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689285
S. Sappok, S. Joeres, S. Heinen
A novel calibration scheme for predistortion SigmaDelta PLLs is proposed in this paper. In contrast to present calibration algorithms this technique detects the integral phase variation of the loops step response. The architecture uses minimum chip area by synchronously sampling the data content of an delay locked loop. Using this technique to detect the phase difference during a step response allows to determine the real loop gain within 7 mus with an accuracy better than 0.1%. Obtaining this, the deviation from the desired loop gain can be adjusted by a digitally controlled charge pump in order to derive the wanted loop transfer function. This is mandatory for predistortion modulation loops
{"title":"Step Response Detection Technique for Self-Calibrating Predistortion GFSK ΣΔ Modulation Loops","authors":"S. Sappok, S. Joeres, S. Heinen","doi":"10.1109/ICICS.2005.1689285","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689285","url":null,"abstract":"A novel calibration scheme for predistortion SigmaDelta PLLs is proposed in this paper. In contrast to present calibration algorithms this technique detects the integral phase variation of the loops step response. The architecture uses minimum chip area by synchronously sampling the data content of an delay locked loop. Using this technique to detect the phase difference during a step response allows to determine the real loop gain within 7 mus with an accuracy better than 0.1%. Obtaining this, the deviation from the desired loop gain can be adjusted by a digitally controlled charge pump in order to derive the wanted loop transfer function. This is mandatory for predistortion modulation loops","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129217212","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689089
I. Ngamroo, W. Kongprawechnon
When large load disturbances occur in a power system, a system frequency may be heavily perturbed and oscillatory. To stabilize frequency oscillations, the active power controlled by superconducting magnetic energy storage (SMES) can be applied. In this paper, a new robust design of a frequency stabilizer equipped with SMES is presented. The frequency stabilizer is based on a second-order lead/lag compensator. To enhance the robust stability of the controlled system against uncertainties such as system parameters variations, various load changes etc., the multiplicative uncertainty is included in system modeling. As a result, the robust stability can be easily guaranteed in terms of the multiplicative stability margin (MSM). Control parameters of the frequency stabilizer are tuned by a tabu search, so that the desired damping ratio of the target inter-area mode and the best MSM are obtained. Simulation studies confirm the high robustness of the frequency stabilizer against system uncertainties
{"title":"Design of Robust Frequency Stabilizers of Superconducting Magnetic Energy Storages","authors":"I. Ngamroo, W. Kongprawechnon","doi":"10.1109/ICICS.2005.1689089","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689089","url":null,"abstract":"When large load disturbances occur in a power system, a system frequency may be heavily perturbed and oscillatory. To stabilize frequency oscillations, the active power controlled by superconducting magnetic energy storage (SMES) can be applied. In this paper, a new robust design of a frequency stabilizer equipped with SMES is presented. The frequency stabilizer is based on a second-order lead/lag compensator. To enhance the robust stability of the controlled system against uncertainties such as system parameters variations, various load changes etc., the multiplicative uncertainty is included in system modeling. As a result, the robust stability can be easily guaranteed in terms of the multiplicative stability margin (MSM). Control parameters of the frequency stabilizer are tuned by a tabu search, so that the desired damping ratio of the target inter-area mode and the best MSM are obtained. Simulation studies confirm the high robustness of the frequency stabilizer against system uncertainties","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117245623","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 : 2005-12-06DOI: 10.1109/ICICS.2005.1689143
Ji-Soo Keum, Hyon-Soo Lee
In this paper, we propose a new speaker change detection algorithm based on spectral peak track analysis. When we pronounce the Korean sentence or words, it has a rhythm and intonation pattern varies according to the kinds of sentence and speaking style. Spectral peak track has relevance to this information and audio data type. Therefore, we use spectral peak track information as a speaker feature for change detection. The proposed method consists of three parts: data segmentation, feature generation based on spectral peak tracks analysis and change detection. We assume that the changing point exists at the breathing point, because these locations rely on sentence duration, speaking speed and style, and grammar. To evaluate the proposed method, we calculated the precision (PRC) and recall (RCL) for Korean broadcast news and compared these results with the BIC method for randomly selected segments. Experiment result, the PRC is 73.14% and the RCL is 85.46% for Korean broadcast news, and we have achieved a performance comparable to BIC
{"title":"Speaker Change Detection Based on Spectral Peak Track Analysis for Korean Broadcast News","authors":"Ji-Soo Keum, Hyon-Soo Lee","doi":"10.1109/ICICS.2005.1689143","DOIUrl":"https://doi.org/10.1109/ICICS.2005.1689143","url":null,"abstract":"In this paper, we propose a new speaker change detection algorithm based on spectral peak track analysis. When we pronounce the Korean sentence or words, it has a rhythm and intonation pattern varies according to the kinds of sentence and speaking style. Spectral peak track has relevance to this information and audio data type. Therefore, we use spectral peak track information as a speaker feature for change detection. The proposed method consists of three parts: data segmentation, feature generation based on spectral peak tracks analysis and change detection. We assume that the changing point exists at the breathing point, because these locations rely on sentence duration, speaking speed and style, and grammar. To evaluate the proposed method, we calculated the precision (PRC) and recall (RCL) for Korean broadcast news and compared these results with the BIC method for randomly selected segments. Experiment result, the PRC is 73.14% and the RCL is 85.46% for Korean broadcast news, and we have achieved a performance comparable to BIC","PeriodicalId":425178,"journal":{"name":"2005 5th International Conference on Information Communications & Signal Processing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115472987","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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