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[Proceedings] Singapore ICCS/ISITA `92最新文献

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Adaptive multiple-beam array for indoor wireless communications 用于室内无线通信的自适应多波束阵列
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255130
P. Kwala, A. Sheikh
{"title":"Adaptive multiple-beam array for indoor wireless communications","authors":"P. Kwala, A. Sheikh","doi":"10.1109/ICCS.1992.255130","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255130","url":null,"abstract":"An adaptive multiple-beam antenna array is proposed for use in an indoor wireless environment to direct 'narrowbeams' at the desired paths and create nulls towards the cochannel interference (CCI) paths to mitigate the multipath and the CCI impairments. The array performance is evaluated in terms of symbol error rate (SER) for a coherent QPSK signalling scheme. It was discovered that the SER improves with more array elements. The SER with large array is better when there is a dominant path among the multipath. The performance degradation due to CCI depends on the signal-to-interference ratio (SIR) and the CCI path DOA.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"26 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":"122201626","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}
引用次数: 3
Performance of code division multiple-access techniques in optical fibre networks 光纤网络中码分多址技术的性能
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255104
D. Lee, K. B. Letaief
{"title":"Performance of code division multiple-access techniques in optical fibre networks","authors":"D. Lee, K. B. Letaief","doi":"10.1109/ICCS.1992.255104","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255104","url":null,"abstract":"The performance of such multi-user systems under two common coding formats-optical orthogonal and prime sequence codes-is investigated. The method used is an extremely accurate modified Monte Carlo technique.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"1 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":"129823940","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}
引用次数: 0
High-dimensional symmetric interleaved parity check code-general high-dimensional ring code 高维对称交错奇偶校验码——通用高维环码
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255142
S. Takeda, K. Hashimoto, M. Hata
{"title":"High-dimensional symmetric interleaved parity check code-general high-dimensional ring code","authors":"S. Takeda, K. Hashimoto, M. Hata","doi":"10.1109/ICCS.1992.255142","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255142","url":null,"abstract":"A new n-dimensional symmetric parity check code, named the ring code, is proposed. The code is constituted by means of the product space of cyclic-shifted versions of one-dimensional parity check codes, which shows crystalline structural symmetries. The ring code which is based on a two-dimensional ring code has a symmetrical structure. An n-dimensional ring code can easily be formed with (n-l)-dimensional ring codes. The reason why the authors propose this code is the high capacity of correcting burst errors, random errors and multi-burst errors for high-dimensional case. They propose the formation of a general n-dimensional symmetric ring code and show the features and performance of the high-dimensional ring code.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"107 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":"124787704","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}
引用次数: 0
Switching characteristics of distributed Bragg reflector lasers 分布式布拉格反射激光器的开关特性
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255037
S. Benedetto, I. Montrosset, P. Ottolenghi
{"title":"Switching characteristics of distributed Bragg reflector lasers","authors":"S. Benedetto, I. Montrosset, P. Ottolenghi","doi":"10.1109/ICCS.1992.255037","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255037","url":null,"abstract":"This paper presents numerical results concerning wavelength switching of multisection DBR lasers. The static tuning characteristics and the dynamic behavior of the switching between different longitudinal modes is investigated. The influence of hysteresis in the frequency versus grating current characteristics on the forward and backward switching time is clearly shown. The possibility of structures that can operate as frequency bistable devices is explored.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"5 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":"130332142","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}
引用次数: 0
Aperiodic autocorrelation properties of perfect polyphase sequences 完美多相序列的非周期自相关特性
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255063
W. Mow, Sykhoroslova Li
{"title":"Aperiodic autocorrelation properties of perfect polyphase sequences","authors":"W. Mow, Sykhoroslova Li","doi":"10.1109/ICCS.1992.255063","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255063","url":null,"abstract":"Perfect polyphase sequences find applications in radar and synchronisation systems. The authors compute exactly the asymptotic (N to infinity ) peak-to-side-peak ratios of the original Frank and Zadoff-Chu sequences, which shed light on the meaning of the numerical parameters reported by Antweiler and Bomer (Electron. Lett. vol.26, p.2068-70 of 1990).<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"4 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":"130417132","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}
引用次数: 17
A new flooding routing algorithm based on 'node-step' concept 基于“节点-步长”概念的洪水路由新算法
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255029
Sheng Lin, J. Liu
{"title":"A new flooding routing algorithm based on 'node-step' concept","authors":"Sheng Lin, J. Liu","doi":"10.1109/ICCS.1992.255029","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255029","url":null,"abstract":"All nodes in the network are organized into steps in the source-to-destination direction so as to form several sets of stepped nodes. According to the description there are three types of packet copy, further classified as 'useful copies' and 'futile copies'. A new flooding routing Pounds -algorithm is designed to be able to keep the life of useful copies and inhibit reproduction of futile copies or eliminate them effectively. Thus the number of packet copies will be reduced obviously so as to improve the throughput. The essence of implementing the algorithm is described.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"37 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":"126983626","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}
引用次数: 0
Robust broadband beamforming in the presence of beam-steered angle error 存在波束操纵角误差时的鲁棒宽带波束形成
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255147
M. Er, B. Ng
{"title":"Robust broadband beamforming in the presence of beam-steered angle error","authors":"M. Er, B. Ng","doi":"10.1109/ICCS.1992.255147","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255147","url":null,"abstract":"Presents a robust technique for broadband beamforming in the presence of pointing error. Based on the fact that the output power of an optimized beamformer achieves a maximum if the steering vector coincides with that of the desired signal. The technique iteratively searches for the correct 'steering vector' of a broadband source with a known bandwidth. By approximating the 'steering vector' by its first order Taylor series expansion in terms of the steering angle, the maximization process reduces to a one-dimensional optimization problem. Numerical results are presented to illustrate the performance achievable.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"12 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":"123506739","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}
引用次数: 1
A new modified model for hierarchical location registration of PCN 一种新的改进的PCN分层位置配准模型
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255178
Chuan Wang, Jianli Wang, Yanhe Fan
{"title":"A new modified model for hierarchical location registration of PCN","authors":"Chuan Wang, Jianli Wang, Yanhe Fan","doi":"10.1109/ICCS.1992.255178","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255178","url":null,"abstract":"Hierarchical location registration can reduce overheads for a microcellular networks of PCN for operation management, as more work is distributed to the lower stage of the network. A modified model is presented to evaluate the inter-registration time. Numerical results are obtained. Its comparison with the previous model shows that the modified model is more accurate.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"98 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":"116369102","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}
引用次数: 0
An edge-adaptive iterative method for image restoration 一种边缘自适应迭代图像恢复方法
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255015
K. Fujita, S. Kurahashi, Y. Yoshida
{"title":"An edge-adaptive iterative method for image restoration","authors":"K. Fujita, S. Kurahashi, Y. Yoshida","doi":"10.1109/ICCS.1992.255015","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255015","url":null,"abstract":"The paper proposes an edge-adaptive iterative method for restoring a blurred image. An original image is represented as a multiple image model composed of four kinds of edge regions and a flat region. The image is restored with the maximum a posteriori (MAP) criterion, which is realized by the steepest descent technique. The parameters of the original image and edge orientation are estimated from the image temporally restored by a deconvolution method. Computer simulations show that this method suppresses ringing artifacts near sharp edges and avoids smoothing edges in the cases of a motion blur and an out-of-focus blur.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"8 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":"124129182","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}
引用次数: 0
Dynamic channel assignment with queueing 带队列的动态通道分配
[Proceedings] Singapore ICCS/ISITA `92 Pub Date : 1992-11-16 DOI: 10.1109/ICCS.1992.255181
S. Kuek, W. Wong
{"title":"Dynamic channel assignment with queueing","authors":"S. Kuek, W. Wong","doi":"10.1109/ICCS.1992.255181","DOIUrl":"https://doi.org/10.1109/ICCS.1992.255181","url":null,"abstract":"The authors study the effects of queueing on a dynamic channel assignment scheme. They examine the performance of a queued ordered dynamic channel assignment with reassignment (QODCAR) scheme in a highway microcellular environment using simulations. Results show that queueing can improve the channel utilization and lower the probabilities of blocking a new call and call handoff failure. At a grade of service of 0.05, QODCAR achieves a 43 and 12 percent improvement in teletraffic load carried over fixed channel assignment and queued fixed channel assignment respectively.<<ETX>>","PeriodicalId":223769,"journal":{"name":"[Proceedings] Singapore ICCS/ISITA `92","volume":"3 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":"121462447","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}
引用次数: 1
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