Pub Date : 1992-11-16DOI: 10.1109/ICCS.1992.255184
Qian Zhong-liang, Wang Hui, GuWeikang
Presents a new linear target delineating system, LTGIS. Supported by a VAX11-730 and a MODEL75 system. LTGIS employs a knowledge-based man-machine interactive scheme and a multimodel information integrating technique, and has high speed and precision in the detection of linear structure of the ground. The road information such as the position of the region which has some road segments to be detected, and the start-point and end-point of a detected road segment, is located by a tracking ball, while other information such as the curvature and brightness of the road segment, is inputed by keyboard. These knowledge, together with the algorithm of the slope of road starting point, and the algorithm of optimum road tracking, forms a interactive knowledge-based linear geography target interpretation system.<>
{"title":"Linear target interpretation system for low-resolution satellite remote-sensing image","authors":"Qian Zhong-liang, Wang Hui, GuWeikang","doi":"10.1109/ICCS.1992.255184","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255184","url":null,"abstract":"Presents a new linear target delineating system, LTGIS. Supported by a VAX11-730 and a MODEL75 system. LTGIS employs a knowledge-based man-machine interactive scheme and a multimodel information integrating technique, and has high speed and precision in the detection of linear structure of the ground. The road information such as the position of the region which has some road segments to be detected, and the start-point and end-point of a detected road segment, is located by a tracking ball, while other information such as the curvature and brightness of the road segment, is inputed by keyboard. These knowledge, together with the algorithm of the slope of road starting point, and the algorithm of optimum road tracking, forms a interactive knowledge-based linear geography target interpretation system.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131412962","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255166
R. Esmailzadeh, M. Nakagawa
A time division duplex (TDD) direct sequence spread spectrum communication (DS-SS) system is proposed for operation in multipath Rayleigh fading environments such as indoor communication channels. It is shown that utilising the TDD technique is advantageous for various reasons such as the simplification of the DS-SS transmitter and receivers, more efficient frequency bandwidth utilisation and the realisation of a simple but efficient power control technique. Computer simulation results show the superiority of the power control method. An efficient power control method will result in higher capacities for the system.<>
{"title":"Time division duplex technique for power control in selection diversity reception direct sequence spread spectrum communications","authors":"R. Esmailzadeh, M. Nakagawa","doi":"10.1109/ICCS.1992.255166","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255166","url":null,"abstract":"A time division duplex (TDD) direct sequence spread spectrum communication (DS-SS) system is proposed for operation in multipath Rayleigh fading environments such as indoor communication channels. It is shown that utilising the TDD technique is advantageous for various reasons such as the simplification of the DS-SS transmitter and receivers, more efficient frequency bandwidth utilisation and the realisation of a simple but efficient power control technique. Computer simulation results show the superiority of the power control method. An efficient power control method will result in higher capacities for the system.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124428980","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255091
H. Saito, R. Kohno, H. Imai
This paper proposes and investigates a multidimensional coded modulation system with a new mapping scheme. If several codewords are mapped each to a modulated signal point and distinguishable in decoding, then transmission rate can decrease even for the same code rate. Such mapping and decoding schemes are described for multidimensional trellis coded modulation (TCM). It is proposed to use a block error-correcting code in order to protect supplemental information to distinguish codewords mapped to the same signal point. This modified system is considered as a combined TCM and block coded modulation scheme. BER performance is improved over the originally proposed scheme.<>
{"title":"Multidimensional coded modulation by assigning code vectors to a signal point","authors":"H. Saito, R. Kohno, H. Imai","doi":"10.1109/ICCS.1992.255091","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255091","url":null,"abstract":"This paper proposes and investigates a multidimensional coded modulation system with a new mapping scheme. If several codewords are mapped each to a modulated signal point and distinguishable in decoding, then transmission rate can decrease even for the same code rate. Such mapping and decoding schemes are described for multidimensional trellis coded modulation (TCM). It is proposed to use a block error-correcting code in order to protect supplemental information to distinguish codewords mapped to the same signal point. This modified system is considered as a combined TCM and block coded modulation scheme. BER performance is improved over the originally proposed scheme.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124528257","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255083
H. Ching, P. Kam
The general approach for analyzing the bit error probability of the receiver for a general MPSK signal set also obtains the bit error probability of differentially encoded MPSK transmission of the convolutionally coded symbols, the differential detection decoding metric being used at the receiver. Numerical performance results obtained using a first-order Butterworth fading process model show significant performance improvement of MPSK modulation with channel estimation over MDPSK modulation with differential detection.<>
{"title":"Performance of coded MPSK sequences over the slow nonselective Rayleigh fading channel with maximum likelihood sequence estimation","authors":"H. Ching, P. Kam","doi":"10.1109/ICCS.1992.255083","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255083","url":null,"abstract":"The general approach for analyzing the bit error probability of the receiver for a general MPSK signal set also obtains the bit error probability of differentially encoded MPSK transmission of the convolutionally coded symbols, the differential detection decoding metric being used at the receiver. Numerical performance results obtained using a first-order Butterworth fading process model show significant performance improvement of MPSK modulation with channel estimation over MDPSK modulation with differential detection.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114886216","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 : 1992-11-16DOI: 10.1109/ICCS.1992.254918
Shijun Yang, Xixian Chen
The code-excited linear predictive (CELP) coder is considered to be a good candidate for speech coding at low bit rates. Although the speech quality of this coder is good, certain distortions can still be perceived. The long-term predictor is a crucial part in CELP coder. The authors introduce some procedures to find the long-term predictor parameters. They improve the synthetic speech quality quite a lot both in objective (signal-to-noise ratio) and subjective (listening tests) measures.<>
{"title":"Procedures for improving the performance of long-term predictor in CELP coder","authors":"Shijun Yang, Xixian Chen","doi":"10.1109/ICCS.1992.254918","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254918","url":null,"abstract":"The code-excited linear predictive (CELP) coder is considered to be a good candidate for speech coding at low bit rates. Although the speech quality of this coder is good, certain distortions can still be perceived. The long-term predictor is a crucial part in CELP coder. The authors introduce some procedures to find the long-term predictor parameters. They improve the synthetic speech quality quite a lot both in objective (signal-to-noise ratio) and subjective (listening tests) measures.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117151442","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255041
K. Yanagi
Some types of upper and lower bounds are given to the capacity of such channels. With the aid of certain operator inequalities it is proved that the feedback capacity C/sub f/(P) and the nonfeedback capacity C/sub 0/(P) satisfy C/sub 0/(P)>
{"title":"On some properties of the continuous time Gaussian channels with strongly Volterra linear feedback","authors":"K. Yanagi","doi":"10.1109/ICCS.1992.255041","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255041","url":null,"abstract":"Some types of upper and lower bounds are given to the capacity of such channels. With the aid of certain operator inequalities it is proved that the feedback capacity C/sub f/(P) and the nonfeedback capacity C/sub 0/(P) satisfy C/sub 0/(P)<or=C/sub f/(P)<or=C/sub 0/(P/sub 1/), where P/sub 1/ is abstractly given, and C/sub 0/(P)<or=C/sub f/(P)<or=2C/sub 0/(P).<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116489482","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255094
K. Aoyama, Y. Iwadare
This paper shows that from the point of view of aliasing errors and the expected values of the wasting test cost caused by misjudging faulty circuits to be fault-free, there are instances where signature analysis with no (circuit output) compression(SA-NC) is preferable to signature analysis with single MISR(SA-MISR) or multiple input shift registers. It is proposed to apply distortionless sequence compression to the circuit output of SA-NC, which preserves the property of all error detection and yet results in come memory element reduction. Huffman coding and modified Ziv-Lempel coding are promising candidates of distortionless compression when the probabilities of occurrence of input sequences are known and unknown respectively. Simulations are made on two examples of circuits under test, a 9-input and 4-output priority encoder, and a 14-input and 8-output arithmetic logic unit. It is shown that in some instances, Huffman and modified Ziv-Lempel coding result in some 50% reduction of the circuit output length.<>
{"title":"Some analyses on signature analysis with distortionless data compression","authors":"K. Aoyama, Y. Iwadare","doi":"10.1109/ICCS.1992.255094","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255094","url":null,"abstract":"This paper shows that from the point of view of aliasing errors and the expected values of the wasting test cost caused by misjudging faulty circuits to be fault-free, there are instances where signature analysis with no (circuit output) compression(SA-NC) is preferable to signature analysis with single MISR(SA-MISR) or multiple input shift registers. It is proposed to apply distortionless sequence compression to the circuit output of SA-NC, which preserves the property of all error detection and yet results in come memory element reduction. Huffman coding and modified Ziv-Lempel coding are promising candidates of distortionless compression when the probabilities of occurrence of input sequences are known and unknown respectively. Simulations are made on two examples of circuits under test, a 9-input and 4-output priority encoder, and a 14-input and 8-output arithmetic logic unit. It is shown that in some instances, Huffman and modified Ziv-Lempel coding result in some 50% reduction of the circuit output length.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117179045","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255138
K. Muhammad, K. B. Letaief
The estimation of the bit error probability is fundamental to the performance evaluation of today's complex digital communication systems. Unfortunately, from a computational point of view the conventional Monte Carlo (MC) approach proves to be extremely difficult, if not impossible, for simulating such systems. As a result, it is highly desirable to devise MC methods which retain the ability to simulate complex systems, yet require substantially fewer simulation runs to estimate small probabilities. A new quick MC technique for estimating the bit error rate (BER) of sequential decoders is presented. It is shown that the new technique is extremely efficient from a computational point of view and can be used to accurately estimate the BER for specific time invariant convolutional codes.<>
{"title":"Statistical evaluation of the error rate of the Fano and stack algorithm decoders","authors":"K. Muhammad, K. B. Letaief","doi":"10.1109/ICCS.1992.255138","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255138","url":null,"abstract":"The estimation of the bit error probability is fundamental to the performance evaluation of today's complex digital communication systems. Unfortunately, from a computational point of view the conventional Monte Carlo (MC) approach proves to be extremely difficult, if not impossible, for simulating such systems. As a result, it is highly desirable to devise MC methods which retain the ability to simulate complex systems, yet require substantially fewer simulation runs to estimate small probabilities. A new quick MC technique for estimating the bit error rate (BER) of sequential decoders is presented. It is shown that the new technique is extremely efficient from a computational point of view and can be used to accurately estimate the BER for specific time invariant convolutional codes.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125967856","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 : 1992-11-16DOI: 10.1109/ICCS.1992.254970
I. Ryoo, Keejoong Ahn, Sangbae Lee
A simple and effective ATM traffic control technique is proposed for stepwise VBR traffic sources and the design and implementation aspects are considered. Although many interesting traffic control algorithms have been introduced, these methods are very difficult to implement. The proposed cell control algorithm proves to be successful considering that the primary roles of ATM traffic control algorithms and resource management schemes are to provide satisfactory quality of services to B-ISDN users, achieve high statistical multiplexing gain and protect the network elements from being congested in order to achieve network performance objectives. It can be therefore adopted as an ATM cell control technique for the first deployment of the B-ISDN.<>
{"title":"Design and implementation of ATM traffic control technique","authors":"I. Ryoo, Keejoong Ahn, Sangbae Lee","doi":"10.1109/ICCS.1992.254970","DOIUrl":"https://doi.org/10.1109/ICCS.1992.254970","url":null,"abstract":"A simple and effective ATM traffic control technique is proposed for stepwise VBR traffic sources and the design and implementation aspects are considered. Although many interesting traffic control algorithms have been introduced, these methods are very difficult to implement. The proposed cell control algorithm proves to be successful considering that the primary roles of ATM traffic control algorithms and resource management schemes are to provide satisfactory quality of services to B-ISDN users, achieve high statistical multiplexing gain and protect the network elements from being congested in order to achieve network performance objectives. It can be therefore adopted as an ATM cell control technique for the first deployment of the B-ISDN.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125041173","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 : 1992-11-16DOI: 10.1109/ICCS.1992.255110
K. K. Leung, B. Sengupta, R. Yeung
The authors examine the behavior of a source subject to flow control by a credit manager. The source receives packets for transmission into a high speed network according to a renewal process. Credit generated at a fixed rate is allowed to accumulate subject to an upper bound. Packet transmission is allowed to start only if the accumulated credit is at least as large as service time. The credit bank is depleted at the onset of service by an amount which equals the service time. The distributions of the sojourn time and queue length have been found by assuming a special structure for the service time distribution and credit bank. This paper extends the approach to obtain the interdeparture time distribution. It shows by numerical examples that the algorithms can solve practical problems.<>
{"title":"Interdeparture time distribution for a credit manager in high speed networks","authors":"K. K. Leung, B. Sengupta, R. Yeung","doi":"10.1109/ICCS.1992.255110","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255110","url":null,"abstract":"The authors examine the behavior of a source subject to flow control by a credit manager. The source receives packets for transmission into a high speed network according to a renewal process. Credit generated at a fixed rate is allowed to accumulate subject to an upper bound. Packet transmission is allowed to start only if the accumulated credit is at least as large as service time. The credit bank is depleted at the onset of service by an amount which equals the service time. The distributions of the sojourn time and queue length have been found by assuming a special structure for the service time distribution and credit bank. This paper extends the approach to obtain the interdeparture time distribution. It shows by numerical examples that the algorithms can solve practical problems.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129415743","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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