Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160793
S. Hladik, S. Chennakeshu, G. Saulnier
The adjacent channel interference characteristics of a system employing Nyquist-pulse, pi /4-shifted differential quadrature phase (DQPSK) modulation were investigated for a US digital land mobile radio application. The effects of transmit pulse-shape windowing, power amplifier characteristics, and the performance reference defining minimum receiver sensitivity on the achievable adjacent channel interference protection ratio (ACIPR) were examined via computer simulation. Estimates of in-band to adjacent-band power are presented, and ACIPR data obtained from simulations of the proposed system based on a modification of the selectivity measurement defined in EIA Standard RS204-C are given. These results indicate that the proposed system provides from 40 dB to 70 dB of ACIPR with a two-fold increase in capacity, depending on the transmitter's power and required average probability of bit error.<>
{"title":"On ACIPR of pi /4 shifted DQPSK for US digital land mobile radio systems","authors":"S. Hladik, S. Chennakeshu, G. Saulnier","doi":"10.1109/PACRIM.1991.160793","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160793","url":null,"abstract":"The adjacent channel interference characteristics of a system employing Nyquist-pulse, pi /4-shifted differential quadrature phase (DQPSK) modulation were investigated for a US digital land mobile radio application. The effects of transmit pulse-shape windowing, power amplifier characteristics, and the performance reference defining minimum receiver sensitivity on the achievable adjacent channel interference protection ratio (ACIPR) were examined via computer simulation. Estimates of in-band to adjacent-band power are presented, and ACIPR data obtained from simulations of the proposed system based on a modification of the selectivity measurement defined in EIA Standard RS204-C are given. These results indicate that the proposed system provides from 40 dB to 70 dB of ACIPR with a two-fold increase in capacity, depending on the transmitter's power and required average probability of bit error.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122131729","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160728
E. Jernigan, K. Erler
An examination is made of the use of simple adaptive recursive filters for image restoration. Adaptive behavior is achieved by changing the position of filter poles or zeros depending on local image characteristics. Optimal adaptive recursive filters are developed and implemented. Classical adaptive image filters are approximated in this framework and compared to the optimal mechanisms.<>
{"title":"Adaptive processing of images","authors":"E. Jernigan, K. Erler","doi":"10.1109/PACRIM.1991.160728","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160728","url":null,"abstract":"An examination is made of the use of simple adaptive recursive filters for image restoration. Adaptive behavior is achieved by changing the position of filter poles or zeros depending on local image characteristics. Optimal adaptive recursive filters are developed and implemented. Classical adaptive image filters are approximated in this framework and compared to the optimal mechanisms.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123483767","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160762
N. Matsumoto
Sufficient conditions for state space representation of structurally stable N-D bounded real (BR) and lossless bounded real matrices (LBR matrices) are derived in the case of discrete-time systems and noncommensurate time-delay systems. Circuit theoretic interpretations for these conditions are given. The similarity of algebraically equivalent minimal realizations of the 2D LBR transfer function is discussed on the basis of their intermediate realizations in the case of two types of 2D state space model.<>
{"title":"On state space representations of LBR and BR matrices for N-D discrete-time systems and time-delay systems","authors":"N. Matsumoto","doi":"10.1109/PACRIM.1991.160762","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160762","url":null,"abstract":"Sufficient conditions for state space representation of structurally stable N-D bounded real (BR) and lossless bounded real matrices (LBR matrices) are derived in the case of discrete-time systems and noncommensurate time-delay systems. Circuit theoretic interpretations for these conditions are given. The similarity of algebraically equivalent minimal realizations of the 2D LBR transfer function is discussed on the basis of their intermediate realizations in the case of two types of 2D state space model.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124685196","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160750
D. Wirth
The T1Q1.5 Video Teleconferencing/Video Telephony Subworking Group (SWG) was formed to draft a performance standard. Important questions were asked, relating to video digital performance characteristics of video teleconferencing/video telephony. Is it possible to measure motion artifacts with digital transport? If it can be done by objective measurements, can they be matched to subjective tests? Is it possible to correlate the objective measurements of analog and digital performance specifications? The SWG's attempt to answer these questions is discussed.<>
{"title":"T1Q1.5, Subworking Group, Video Teleconferencing/Video Telephony","authors":"D. Wirth","doi":"10.1109/PACRIM.1991.160750","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160750","url":null,"abstract":"The T1Q1.5 Video Teleconferencing/Video Telephony Subworking Group (SWG) was formed to draft a performance standard. Important questions were asked, relating to video digital performance characteristics of video teleconferencing/video telephony. Is it possible to measure motion artifacts with digital transport? If it can be done by objective measurements, can they be matched to subjective tests? Is it possible to correlate the objective measurements of analog and digital performance specifications? The SWG's attempt to answer these questions is discussed.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129559760","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160816
S. Kiaei
The authors present an overview of synthesis methods for VLSI array processors. The synthesis was based on expressing the algorithm in terms of a set of recurrence equations which were mapped onto a set of processing elements connected in a systolic fashion. A method for the synthesis of multirate arrays is outlined. to show the synthesis procedure, the systematic derivation of the array structure for infinite impulse response (IIR) digital filters is presented. The authors illustrate how these transformations can be applied.<>
{"title":"Systematic derivation of VLSI arrays for digital DSP algorithms","authors":"S. Kiaei","doi":"10.1109/PACRIM.1991.160816","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160816","url":null,"abstract":"The authors present an overview of synthesis methods for VLSI array processors. The synthesis was based on expressing the algorithm in terms of a set of recurrence equations which were mapped onto a set of processing elements connected in a systolic fashion. A method for the synthesis of multirate arrays is outlined. to show the synthesis procedure, the systematic derivation of the array structure for infinite impulse response (IIR) digital filters is presented. The authors illustrate how these transformations can be applied.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133891131","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160667
E. Takahashi, H. Koike, H. Tanaka
PIE64 is a parallel inference machine. The goal is fast execution of large-scale knowledge processing. Generally speaking, an interconnection network (IN) is one of the keys to designing a parallel machine and affects a total system architecture. The IN of PIE64 is designed with the aim of maximizing its performance. A discussion is presented of the IN suitable for PIE64, and an IN with circuit switching, nonbuffering, multistage, dynamic load balancing support, and duplicated network is proposed. Its hardware implementation is considered, and the assembling process is described. Electrical characteristics are also described.<>
{"title":"A study of a high bandwidth and low latency interconnection network in PIE64","authors":"E. Takahashi, H. Koike, H. Tanaka","doi":"10.1109/PACRIM.1991.160667","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160667","url":null,"abstract":"PIE64 is a parallel inference machine. The goal is fast execution of large-scale knowledge processing. Generally speaking, an interconnection network (IN) is one of the keys to designing a parallel machine and affects a total system architecture. The IN of PIE64 is designed with the aim of maximizing its performance. A discussion is presented of the IN suitable for PIE64, and an IN with circuit switching, nonbuffering, multistage, dynamic load balancing support, and duplicated network is proposed. Its hardware implementation is considered, and the assembling process is described. Electrical characteristics are also described.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132929723","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160689
H. Phuong, S. K. Ramesh
Coherent optical systems that utilize spectrally efficient modulation schemes are studied with the aid of computer simulation. Models for the optical fiber, laser transmitter, and receiver are implemented in BASIC. The program includes the effects of additive white Gaussian noise and the various noise sources at the receiver. The results indicate that multilevel modulation schemes can be effectively used in coherent optical communication systems.<>
{"title":"Spectrally efficient coherent optical communication systems","authors":"H. Phuong, S. K. Ramesh","doi":"10.1109/PACRIM.1991.160689","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160689","url":null,"abstract":"Coherent optical systems that utilize spectrally efficient modulation schemes are studied with the aid of computer simulation. Models for the optical fiber, laser transmitter, and receiver are implemented in BASIC. The program includes the effects of additive white Gaussian noise and the various noise sources at the receiver. The results indicate that multilevel modulation schemes can be effectively used in coherent optical communication systems.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131990278","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160700
D. Swingler, S. Davies
The authors demonstrate that the ALPINEX technique is applicable to the circular array case and by simulation explore some of the areas of interest. In particular it is indicated that the deleterious effect of nulls in the Bessel weighting factors can be mitigated by the interpolation facility in ALPINEX. The presence of a central element in the circular array is advantageous.<>
{"title":"Spatial harmonic interpolation and extrapolation for use with circular arrays","authors":"D. Swingler, S. Davies","doi":"10.1109/PACRIM.1991.160700","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160700","url":null,"abstract":"The authors demonstrate that the ALPINEX technique is applicable to the circular array case and by simulation explore some of the areas of interest. In particular it is indicated that the deleterious effect of nulls in the Bessel weighting factors can be mitigated by the interpolation facility in ALPINEX. The presence of a central element in the circular array is advantageous.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129443097","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160804
T. Suzuki, R. Kudo
The authors developed the expert system, QUALTES, to create the command table of stoppage operations for maintenance at a substation, and to verify it by simulation. The system was developed by using object-oriented programming and ATMS (assumption-based truth maintenance system). These techniques aided the development of portability. QUALTES consists of the distribution system and the kernel system. The distribution system is based on the first version of QUALTES. The kernel system is appended to generate each substation model which is used in the distribution system. The kernel system ensures that QUALTES can be used at any substation. The kernel system defines electrical connections with a graphical user-interface. Therefore, end-users can generate any substation model with QUALTES. The kernel system consists of two subsystems for definition by the end-user, the skeleton construction subsystem, and the editor construction subsystem. These two subsystems are described.<>
{"title":"Approach to the maintenance of knowledge base by end-user: substation switching sequence support expert system (QUALTES)","authors":"T. Suzuki, R. Kudo","doi":"10.1109/PACRIM.1991.160804","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160804","url":null,"abstract":"The authors developed the expert system, QUALTES, to create the command table of stoppage operations for maintenance at a substation, and to verify it by simulation. The system was developed by using object-oriented programming and ATMS (assumption-based truth maintenance system). These techniques aided the development of portability. QUALTES consists of the distribution system and the kernel system. The distribution system is based on the first version of QUALTES. The kernel system is appended to generate each substation model which is used in the distribution system. The kernel system ensures that QUALTES can be used at any substation. The kernel system defines electrical connections with a graphical user-interface. Therefore, end-users can generate any substation model with QUALTES. The kernel system consists of two subsystems for definition by the end-user, the skeleton construction subsystem, and the editor construction subsystem. These two subsystems are described.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129607670","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 : 1991-05-09DOI: 10.1109/PACRIM.1991.160779
S. Eady, B. Dickson, R. C. Snell, J. Woolsey, P. Ollek
The authors describe a microcomputer-based speech-concatenation system that is being developed to produce automated voice output for the broadcast of weather forecasts. The system consists of an inventory of prerecorded speech units (words and phrases of English), and the software that is necessary to translate a weather forecast from a text format into an audio format. Speech units are processed and encoded using residual-excited linear predictive coding. This method allows changes to be made to certain speech parameters without significant degradation in speech quality. Such changes are necessary to ensure that the voice output for weather broadcasts sounds as natural as possible.<>
{"title":"A microcomputer-based speech-output system for generating automated weather reports","authors":"S. Eady, B. Dickson, R. C. Snell, J. Woolsey, P. Ollek","doi":"10.1109/PACRIM.1991.160779","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160779","url":null,"abstract":"The authors describe a microcomputer-based speech-concatenation system that is being developed to produce automated voice output for the broadcast of weather forecasts. The system consists of an inventory of prerecorded speech units (words and phrases of English), and the software that is necessary to translate a weather forecast from a text format into an audio format. Speech units are processed and encoded using residual-excited linear predictive coding. This method allows changes to be made to certain speech parameters without significant degradation in speech quality. Such changes are necessary to ensure that the voice output for weather broadcasts sounds as natural as possible.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132054009","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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