Pub Date : 1999-08-22DOI: 10.1109/PACRIM.1999.799563
Wu-Hsiang Jonas Chen, Jenq-Neng Hwang, Surnit Roy
The ordered statistics decoding algorithm is applied to the wide-sense-stationary uncorrelated-scattering (WSSUS) Rayleigh fading channel, modeled as a frequency non-selective, slow-fading environment without intersymbol interference (ISI). We derive the log-likelihood ratio of received symbols based on 2-DPSK transmission. Simulations are conducted for the WSSUS channel at various interleaving degrees. At bit error rate (BER) of 10/sup -5/ and 38 dB gain compared to uncoded 2-DPSK are obtained for the decoding of the (128,64,22) extended BCH code with interleaving degree 50.
{"title":"Ordered statistics decoding of linear block codes on the WSSUS multipath channel","authors":"Wu-Hsiang Jonas Chen, Jenq-Neng Hwang, Surnit Roy","doi":"10.1109/PACRIM.1999.799563","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799563","url":null,"abstract":"The ordered statistics decoding algorithm is applied to the wide-sense-stationary uncorrelated-scattering (WSSUS) Rayleigh fading channel, modeled as a frequency non-selective, slow-fading environment without intersymbol interference (ISI). We derive the log-likelihood ratio of received symbols based on 2-DPSK transmission. Simulations are conducted for the WSSUS channel at various interleaving degrees. At bit error rate (BER) of 10/sup -5/ and 38 dB gain compared to uncoded 2-DPSK are obtained for the decoding of the (128,64,22) extended BCH code with interleaving degree 50.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130998220","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799468
D. Dodds, G. Erker, J. Hanson, G. Bradley
This paper discusses the modification of an existing LAN technology to provide Internet access on residential and business telephone lines. A data over voice method is used to allow simultaneous voice and Internet access on the same telephone line. Advantages to the customer and to the operating telephone company are discussed and the implementation of a hardware field trial is presented.
{"title":"Splitterless DSL at 230 kb/s for Internet access","authors":"D. Dodds, G. Erker, J. Hanson, G. Bradley","doi":"10.1109/PACRIM.1999.799468","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799468","url":null,"abstract":"This paper discusses the modification of an existing LAN technology to provide Internet access on residential and business telephone lines. A data over voice method is used to allow simultaneous voice and Internet access on the same telephone line. Advantages to the customer and to the operating telephone company are discussed and the implementation of a hardware field trial is presented.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126802599","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799613
D. Wang, M. Meng, Y. Liu
The influence of shear, rotary inertia on the dynamic characteristics of flexible manipulators is studied through frequency analysis. In terms of the various geometric effects, dynamic models of flexible manipulators are set up and characteristic equations are derived. By using the analysis, the influences of shear, rotary inertia, axial force on the flexible manipulator are given.
{"title":"Influence of shear, rotary inertia on the dynamic characteristics of flexible manipulators","authors":"D. Wang, M. Meng, Y. Liu","doi":"10.1109/PACRIM.1999.799613","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799613","url":null,"abstract":"The influence of shear, rotary inertia on the dynamic characteristics of flexible manipulators is studied through frequency analysis. In terms of the various geometric effects, dynamic models of flexible manipulators are set up and characteristic equations are derived. By using the analysis, the influences of shear, rotary inertia, axial force on the flexible manipulator are given.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":" 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113953195","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799579
Z. Wang, B. Cockburn, D. Elliott, W. Krzymień
In this paper a new parallel computational RAM (C/spl middot/RAM) architecture, called DSP-RAM, is proposed to speed up a class of digital signal processing (DSP) algorithms in telecommunications. The proposed architecture integrates memory and single instruction stream, multiple data stream (SIMD) parallel processing into a single chip. Key elements of the architecture were designed to verify their cost in silicon area. A software simulator was written in C++ to evaluate the performance of DSP-RAM implementations of critical components in the ITU G.728 voice coding standard.
{"title":"DSP-RAM: A logic-enhanced memory architecture for communication signal processing","authors":"Z. Wang, B. Cockburn, D. Elliott, W. Krzymień","doi":"10.1109/PACRIM.1999.799579","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799579","url":null,"abstract":"In this paper a new parallel computational RAM (C/spl middot/RAM) architecture, called DSP-RAM, is proposed to speed up a class of digital signal processing (DSP) algorithms in telecommunications. The proposed architecture integrates memory and single instruction stream, multiple data stream (SIMD) parallel processing into a single chip. Key elements of the architecture were designed to verify their cost in silicon area. A software simulator was written in C++ to evaluate the performance of DSP-RAM implementations of critical components in the ITU G.728 voice coding standard.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114609216","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799501
Dong-Kwang Lee, B. Ahn, Hyek-Seong Kweon, Kukho Bae, Kiryong Yoon
The locality of data references in distributed shared memory systems affects the performance significantly. Data allocation methods reflecting the locality of data references can improve the performance of DSM systems. This paper proposes an effective cache coherence scheme by utilizing the near processor locality, and evaluates its performance. The proposed scheme reduces memory overhead by using a presence table. If a processor is within a predefined distance, the identification of a processor is set to the presence table. Otherwise, its identification is stored to a directory pool. This scheme can solve the disadvantages of the limited directory scheme and the dynamic point allocation directory scheme. Simulation are conducted using three application programs which have various shared data. The results show that the optimal data allocation method with the proposed scheme reduces the directory pool access up to 4.8 times.
{"title":"An effective cache coherence scheme using data locality","authors":"Dong-Kwang Lee, B. Ahn, Hyek-Seong Kweon, Kukho Bae, Kiryong Yoon","doi":"10.1109/PACRIM.1999.799501","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799501","url":null,"abstract":"The locality of data references in distributed shared memory systems affects the performance significantly. Data allocation methods reflecting the locality of data references can improve the performance of DSM systems. This paper proposes an effective cache coherence scheme by utilizing the near processor locality, and evaluates its performance. The proposed scheme reduces memory overhead by using a presence table. If a processor is within a predefined distance, the identification of a processor is set to the presence table. Otherwise, its identification is stored to a directory pool. This scheme can solve the disadvantages of the limited directory scheme and the dynamic point allocation directory scheme. Simulation are conducted using three application programs which have various shared data. The results show that the optimal data allocation method with the proposed scheme reduces the directory pool access up to 4.8 times.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121887377","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799506
M. Adams, F. Kossentini
A simple exhaustive search technique is explored as a means to design low-complexity reversible integer-to-integer wavelet transforms for image coding applications. Several new transforms found with this approach are employed in an image coder in order to demonstrate their effectiveness.
{"title":"Low-complexity reversible integer-to-integer wavelet transforms for image coding","authors":"M. Adams, F. Kossentini","doi":"10.1109/PACRIM.1999.799506","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799506","url":null,"abstract":"A simple exhaustive search technique is explored as a means to design low-complexity reversible integer-to-integer wavelet transforms for image coding applications. Several new transforms found with this approach are employed in an image coder in order to demonstrate their effectiveness.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116814030","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799545
Bonjin Ku, Hayoung Yang, Sukhyon Yoon, Sangchul Han, C. Kang
In this paper, we propose a turbo coding scheme for spread spectrum with bandwidth efficiency. The scheme has a good performance on Gaussian channels and Rayleigh fading channels. We also show that the turbo code is powerful in multi-user environments. In our research, the turbo coded direct-sequence spread spectrum multiple access (DS/SSMA) system with differentially encoded star 16-QAM modulation is investigated in both aspects of error control performance and bandwidth efficiency. The results show that the coding system has a good error performance and spectral efficiency of 2 bits/s/Hz with star 16-QAM.
本文提出了一种具有带宽效率的扩频turbo编码方案。该方案在高斯信道和瑞利衰落信道上都具有良好的性能。我们还展示了turbo代码在多用户环境中的强大功能。本文从误差控制性能和带宽效率两个方面研究了差分星型16-QAM调制的turbo编码直接序列扩频多址(DS/SSMA)系统。结果表明，该编码系统具有良好的误码性能和2 bit /s/Hz的频谱效率。
{"title":"Turbo code and star 16-QAM for DS/SSMA communications","authors":"Bonjin Ku, Hayoung Yang, Sukhyon Yoon, Sangchul Han, C. Kang","doi":"10.1109/PACRIM.1999.799545","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799545","url":null,"abstract":"In this paper, we propose a turbo coding scheme for spread spectrum with bandwidth efficiency. The scheme has a good performance on Gaussian channels and Rayleigh fading channels. We also show that the turbo code is powerful in multi-user environments. In our research, the turbo coded direct-sequence spread spectrum multiple access (DS/SSMA) system with differentially encoded star 16-QAM modulation is investigated in both aspects of error control performance and bandwidth efficiency. The results show that the coding system has a good error performance and spectral efficiency of 2 bits/s/Hz with star 16-QAM.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115142199","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799469
Xavier N Fernando, A. Sesay
The biggest limitation of radio over fiber (ROF) links in a microcellular environment is the limited dynamic range (DR) due to laser nonlinearity. In this paper for the first time, a look-up table based adaptive predistortion scheme is proposed to enhance the ROF link linearity. An adaptive filter trains itself to generate table entries and no prior knowledge of link physical parameters is needed. When data is transmitted, each symbol is pre-distorted at the symbol rate to compensate channel distortion. Experimental and simulation results show excellent performance improvement. The power handling capability of the laser diode is the upper limit. This scheme can be further simplified if limited AM-AM distortion is allowed which does not significantly contribute to system degradation.
{"title":"Look-up table based adaptive predistortion for dynamic range enhancement in a radio over fiber link","authors":"Xavier N Fernando, A. Sesay","doi":"10.1109/PACRIM.1999.799469","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799469","url":null,"abstract":"The biggest limitation of radio over fiber (ROF) links in a microcellular environment is the limited dynamic range (DR) due to laser nonlinearity. In this paper for the first time, a look-up table based adaptive predistortion scheme is proposed to enhance the ROF link linearity. An adaptive filter trains itself to generate table entries and no prior knowledge of link physical parameters is needed. When data is transmitted, each symbol is pre-distorted at the symbol rate to compensate channel distortion. Experimental and simulation results show excellent performance improvement. The power handling capability of the laser diode is the upper limit. This scheme can be further simplified if limited AM-AM distortion is allowed which does not significantly contribute to system degradation.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"19 3-4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123547846","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799479
Lichen Zhang, P. Yuan
Multimedia computing has emerged in the last ten years as a major area of research. These computer systems have opened a wide range of potential applications by combining a variety of information sources, such as voice, graphics, animation, images, audio, and full-motion video. The fundamental characteristic of multimedia systems is that they incorporate continuous media such as voice, video, and animated graphics. In this paper, we discuss some real-time issues in continuous media and some solutions to deal with them.
{"title":"Some real-time requirements in continuous multimedia applications","authors":"Lichen Zhang, P. Yuan","doi":"10.1109/PACRIM.1999.799479","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799479","url":null,"abstract":"Multimedia computing has emerged in the last ten years as a major area of research. These computer systems have opened a wide range of potential applications by combining a variety of information sources, such as voice, graphics, animation, images, audio, and full-motion video. The fundamental characteristic of multimedia systems is that they incorporate continuous media such as voice, video, and animated graphics. In this paper, we discuss some real-time issues in continuous media and some solutions to deal with them.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115332286","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 : 1999-08-22DOI: 10.1109/PACRIM.1999.799550
Zhonghui Yao, B. Doray
In this paper, we propose a queue growth rate based explicit rate (QGER) feedback flow control algorithm for ABR flow control in ATM networks. The novel characteristics in QGER are: (1) considering the link input rate and queue growth rate simultaneously to determine the traffic load, the congestion status and the fair share of available bandwidth; (2) monitoring the link input rate at the egress of the switch output queue; and (3) introducing a parameter, which is linked to the measurement interval, the round trip time, and the number of active ABR connections, to calculate and allocate the available bandwidth proportionally and fairly to the active ABR connections. Simulation results demonstrate that the network performance is improved significantly and the proposed QGER algorithm is efficient, robust, and simple. The paper gives an introduction, describes the QGER algorithm, presents some simulation results, and finally draws some conclusions.
{"title":"A queue growth rate based flow control algorithm","authors":"Zhonghui Yao, B. Doray","doi":"10.1109/PACRIM.1999.799550","DOIUrl":"https://doi.org/10.1109/PACRIM.1999.799550","url":null,"abstract":"In this paper, we propose a queue growth rate based explicit rate (QGER) feedback flow control algorithm for ABR flow control in ATM networks. The novel characteristics in QGER are: (1) considering the link input rate and queue growth rate simultaneously to determine the traffic load, the congestion status and the fair share of available bandwidth; (2) monitoring the link input rate at the egress of the switch output queue; and (3) introducing a parameter, which is linked to the measurement interval, the round trip time, and the number of active ABR connections, to calculate and allocate the available bandwidth proportionally and fairly to the active ABR connections. Simulation results demonstrate that the network performance is improved significantly and the proposed QGER algorithm is efficient, robust, and simple. The paper gives an introduction, describes the QGER algorithm, presents some simulation results, and finally draws some conclusions.","PeriodicalId":176763,"journal":{"name":"1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129650449","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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