Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652275
W. Lou, L. T. Chia, Bu-Sung Lee
This paper presents the results of our study on the statistical characterization of MPEG-2 VBR video stream and the modeling of such source. The frame trace, marginal distribution of the frame size and the high autocorrelation existing in the continuous frames are analyzed. An ARMA process is used to model MPEG-2 video source. The different frame types of MPEG-2 video are considered together by performing a normalization transformation during modeling. The performance of the model is examined and the results show that the model is good in fitting the histogram and preserving the property of autocorrelation. We also indicate that the proper order of the ARMA model depends on the frame pattern of the MPEG source.
{"title":"Characterization and source modeling of MPEG-2 VBR video source","authors":"W. Lou, L. T. Chia, Bu-Sung Lee","doi":"10.1109/ICICS.1997.652275","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652275","url":null,"abstract":"This paper presents the results of our study on the statistical characterization of MPEG-2 VBR video stream and the modeling of such source. The frame trace, marginal distribution of the frame size and the high autocorrelation existing in the continuous frames are analyzed. An ARMA process is used to model MPEG-2 video source. The different frame types of MPEG-2 video are considered together by performing a normalization transformation during modeling. The performance of the model is examined and the results show that the model is good in fitting the histogram and preserving the property of autocorrelation. We also indicate that the proper order of the ARMA model depends on the frame pattern of the MPEG source.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"58 1","pages":"1652-1656 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83169608","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 : 1997-09-09DOI: 10.1109/ICICS.1997.652093
R. Raje, S. Mukhopadhyay, M. Boyles, N. Patel, J. Mostafa
The enormous growth of the World Wide Web has led to a vast amount of unsolicited information being transmitted to many users. Information filtering is a useful technique to combat such an undesired information overload. In this paper, we present a distributed environment for information classification, called D-SIFTER. D-SIFTER (distributed smart information filtering technology for electronic resources) consists of many networked filters communicating to achieve a collaborative classification of incoming documents. Our preliminary experiments show a 44% increase in the number of successful classifications in D-SIFTER as compared to the isolated environment called SIFTER (smart information filtering technology for electronic resources).
{"title":"D-SIFTER: a collaborative information classifier","authors":"R. Raje, S. Mukhopadhyay, M. Boyles, N. Patel, J. Mostafa","doi":"10.1109/ICICS.1997.652093","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652093","url":null,"abstract":"The enormous growth of the World Wide Web has led to a vast amount of unsolicited information being transmitted to many users. Information filtering is a useful technique to combat such an undesired information overload. In this paper, we present a distributed environment for information classification, called D-SIFTER. D-SIFTER (distributed smart information filtering technology for electronic resources) consists of many networked filters communicating to achieve a collaborative classification of incoming documents. Our preliminary experiments show a 44% increase in the number of successful classifications in D-SIFTER as compared to the isolated environment called SIFTER (smart information filtering technology for electronic resources).","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"206 1","pages":"820-824 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82824245","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 : 1997-09-09DOI: 10.1109/ICICS.1997.652222
Su-yeon Kim, J. Hahm
We present a convergence layer protocol enabling the multipoint communication service (MCS) protocol to run over the multipoint transport protocol. This protocol structure makes the MCS protocol execute on peer to peer transport protocol and multicast transport protocol at the same time. For doing this, the convergence layer determines whether the peer MCU is multicast capable during the connection phase. If the distant MCUs reject the request of the local MCU, the connection is not multicast capable. If the MCUs corresponds to the successful case, the MCUs will use multicast to the transfer channel data.
{"title":"Convergence layer: MCS over RMP","authors":"Su-yeon Kim, J. Hahm","doi":"10.1109/ICICS.1997.652222","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652222","url":null,"abstract":"We present a convergence layer protocol enabling the multipoint communication service (MCS) protocol to run over the multipoint transport protocol. This protocol structure makes the MCS protocol execute on peer to peer transport protocol and multicast transport protocol at the same time. For doing this, the convergence layer determines whether the peer MCU is multicast capable during the connection phase. If the distant MCUs reject the request of the local MCU, the connection is not multicast capable. If the MCUs corresponds to the successful case, the MCUs will use multicast to the transfer channel data.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"28 1","pages":"1405-1409 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89270298","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 : 1997-09-09DOI: 10.1109/ICICS.1997.647148
Y. Ang, M. Bi, S. Ong
To enhance the performance of nonlinear interpolative vector quantization for wavelet transform image coding, we propose a directional vector classification scheme that results in an adaptive interpolative vector quantization method suitable for wavelet-based image compression. Vectors consisting of wavelet-transformed coefficients are classified into different categories according to their directional activity energy. An adaptive bit assignment algorithm effectively allocates the bit budget among different categories. Simulation results show that the new vector quantization method gives superior compression performance and also reduced computational complexity in codebook training and quantization compared to the conventional interpolative vector quantization technique. For standard test images, the PSNR improvement is about 1 dB at the compression ratio of 50.
{"title":"Adaptive vector quantization of wavelet coefficient for image compression","authors":"Y. Ang, M. Bi, S. Ong","doi":"10.1109/ICICS.1997.647148","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647148","url":null,"abstract":"To enhance the performance of nonlinear interpolative vector quantization for wavelet transform image coding, we propose a directional vector classification scheme that results in an adaptive interpolative vector quantization method suitable for wavelet-based image compression. Vectors consisting of wavelet-transformed coefficients are classified into different categories according to their directional activity energy. An adaptive bit assignment algorithm effectively allocates the bit budget among different categories. Simulation results show that the new vector quantization method gives superior compression performance and also reduced computational complexity in codebook training and quantization compared to the conventional interpolative vector quantization technique. For standard test images, the PSNR improvement is about 1 dB at the compression ratio of 50.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"65 1","pages":"500-504 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85787553","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 : 1997-09-09DOI: 10.1109/ICICS.1997.652084
S. Tak, Shinyoung Lim, Chang-Soon Park, Jung-Tae Lee
We design and implement the internetworking system between the ATM network and PSTN, which provides telephone services between the clients of the ATM network and subscribers of the PSTN. The internetworking system consists of the PSTN I/F module, signaling processing module, voice sampling module, voice regeneration module, transmission module, and ATM I/F module. The PSTN I/F module and ATM I/F module are implemented by using the existing commercial hardware products. However, the other 4 modules are implemented for the WIN95 environments by software. The test environment was also implemented and it was found that the internetworking system operates without problems.
{"title":"Design and implementation of internetworking system between ATM and PSTN","authors":"S. Tak, Shinyoung Lim, Chang-Soon Park, Jung-Tae Lee","doi":"10.1109/ICICS.1997.652084","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652084","url":null,"abstract":"We design and implement the internetworking system between the ATM network and PSTN, which provides telephone services between the clients of the ATM network and subscribers of the PSTN. The internetworking system consists of the PSTN I/F module, signaling processing module, voice sampling module, voice regeneration module, transmission module, and ATM I/F module. The PSTN I/F module and ATM I/F module are implemented by using the existing commercial hardware products. However, the other 4 modules are implemented for the WIN95 environments by software. The test environment was also implemented and it was found that the internetworking system operates without problems.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"75 1","pages":"776-780 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86419078","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 : 1997-09-09DOI: 10.1109/ICICS.1997.652205
H. Fu, Shihua Zhu, G. Bi
The average error probability of a cellular wide-band DS-CDMA system with DPSK modulation over Nakagami fading channels is analyzed. The results with varying parameters are applied to different fading environments. To simplify the evaluation of the interference out of the cell-of-interest, concentric circles are employed in place of the common hexagonal cellular model. It is shown that accounting for two layers of interfering cells is sufficient for the performance analysis of a wide-band system if the path loss exponent equals to 4.
{"title":"Performance analysis of wide-band DS-CDMA with DPSK in Nakagami fading channels","authors":"H. Fu, Shihua Zhu, G. Bi","doi":"10.1109/ICICS.1997.652205","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652205","url":null,"abstract":"The average error probability of a cellular wide-band DS-CDMA system with DPSK modulation over Nakagami fading channels is analyzed. The results with varying parameters are applied to different fading environments. To simplify the evaluation of the interference out of the cell-of-interest, concentric circles are employed in place of the common hexagonal cellular model. It is shown that accounting for two layers of interfering cells is sufficient for the performance analysis of a wide-band system if the path loss exponent equals to 4.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"27 1","pages":"1331-1335 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83556928","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 : 1997-09-09DOI: 10.1109/ICICS.1997.647159
Siew-Kee Loh
An acquisition system for a hybrid frequency hopped direct sequence spectrum communication link is proposed and its performance in the presence of multitone jamming is analysed. Given a certain power, the multitone jammer can optimise its effectiveness by varying the number of jammed hop slots. It is shown that the number of jamming tones which results in the poorest acquisition performance increases with J/S. From the communicator's point of view, it is shown the number of hop slots which results in the best anti-jam capability against such multitone jamming depends on the maximum J/S the link is designed to withstand.
{"title":"Acquisition performance of a hybrid SFH/DS spread spectrum link in the presence of multitone jamming","authors":"Siew-Kee Loh","doi":"10.1109/ICICS.1997.647159","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647159","url":null,"abstract":"An acquisition system for a hybrid frequency hopped direct sequence spectrum communication link is proposed and its performance in the presence of multitone jamming is analysed. Given a certain power, the multitone jammer can optimise its effectiveness by varying the number of jammed hop slots. It is shown that the number of jamming tones which results in the poorest acquisition performance increases with J/S. From the communicator's point of view, it is shown the number of hop slots which results in the best anti-jam capability against such multitone jamming depends on the maximum J/S the link is designed to withstand.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"12 1","pages":"550-554 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80123042","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 : 1997-09-09DOI: 10.1109/ICICS.1997.647158
Youngjun Chong
The implementation of a BTS (base station transceiver) for a wideband PCS (personal communication services) system using DS-CDMA (direct sequence-code division multiple access) technology is presented in this paper. It consists of three boards; receiver, transmitter, and RF controller. Some RF parameters are considered and simulated by the RF simulation S/W for commercial and customized components. The implemented transceiver of 5 MHz RF channel bandwidth satisfies the functional requirements of a transceiver such as dynamic range, sensitivity in the receiver and spurious emission suppression in the transmitter.
{"title":"A design and implementation of base station transceiver for wideband PCS system using CDMA technology","authors":"Youngjun Chong","doi":"10.1109/ICICS.1997.647158","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647158","url":null,"abstract":"The implementation of a BTS (base station transceiver) for a wideband PCS (personal communication services) system using DS-CDMA (direct sequence-code division multiple access) technology is presented in this paper. It consists of three boards; receiver, transmitter, and RF controller. Some RF parameters are considered and simulated by the RF simulation S/W for commercial and customized components. The implemented transceiver of 5 MHz RF channel bandwidth satisfies the functional requirements of a transceiver such as dynamic range, sensitivity in the receiver and spurious emission suppression in the transmitter.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"11 1","pages":"545-549 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83865148","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 : 1997-09-09DOI: 10.1109/ICICS.1997.647092
M. Alles, N. Chakpitak
A wireless packet data channel where the underlying communication protocol is the digital sense multiple access with collision detection (DSMA/CD) is considered. A Markov chain model for the reverse channel is obtained and the throughput is analyzed assuming an aggregate Poisson arrival process.
{"title":"Modeling and throughput analysis for a wireless packet data channel","authors":"M. Alles, N. Chakpitak","doi":"10.1109/ICICS.1997.647092","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647092","url":null,"abstract":"A wireless packet data channel where the underlying communication protocol is the digital sense multiple access with collision detection (DSMA/CD) is considered. A Markov chain model for the reverse channel is obtained and the throughput is analyzed assuming an aggregate Poisson arrival process.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"44 1","pages":"225-229 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88369455","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 : 1997-09-09DOI: 10.1109/ICICS.1997.652216
M. Kahaei, Mohamed Deriche, B. Boashash
Order-reduction techniques have already been successfully applied to the detection of linear FM signals in white noise. In this paper, reflection coefficients of adaptive lattice filters are used, in a new aspect, to reduce the order of input polynomial phase FM signals. This concept is then used to detect chirp signals in white noise. To define an appropriate hypothesis problem for the transformed signals in the first adaptive reflection coefficient, its statistical behaviour is experimentally investigated. It is shown that for small confidence intervals, the relevant probability density function for the transformed signal can be assumed Gaussian.
{"title":"Polynomial order reducing property of lattice filters in detection of linear FM signals","authors":"M. Kahaei, Mohamed Deriche, B. Boashash","doi":"10.1109/ICICS.1997.652216","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652216","url":null,"abstract":"Order-reduction techniques have already been successfully applied to the detection of linear FM signals in white noise. In this paper, reflection coefficients of adaptive lattice filters are used, in a new aspect, to reduce the order of input polynomial phase FM signals. This concept is then used to detect chirp signals in white noise. To define an appropriate hypothesis problem for the transformed signals in the first adaptive reflection coefficient, its statistical behaviour is experimentally investigated. It is shown that for small confidence intervals, the relevant probability density function for the transformed signal can be assumed Gaussian.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"15 1","pages":"1382-1385 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77655121","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：