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1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)最新文献

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Desynchronisation between coexisting radio local loop systems based on DECT 基于DECT的共存无线电本地环路系统的非同步
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655547
J. Casademont, J. Paradells, M. Carrillo
{"title":"Desynchronisation between coexisting radio local loop systems based on DECT","authors":"J. Casademont, J. Paradells, M. Carrillo","doi":"10.1109/ICPWC.1997.655547","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655547","url":null,"abstract":"The Digital Enhanced Cordless Telecommunication System (DECT) is gaining acceptance in environments different from those for which the system was designed, in particular outdoors environments such as radio local loop (RLL) and public cordless systems. The main difference between indoors and outdoors is that in this latter environment the signal propagation is not limited between walls, and therefore, is more interfered. When several operators compete for one service using the DECT, they have to share the band allocated to the DECT. There are several ways to share the available frequencies, one is spectrum splitting among all operators. This technique loses capacity because dividing the channels leads to a poor trunking efficiency but, all the systems are independent and there is no need for any synchronisation between them. The second method allows each operator to access the full available spectrum. It can be seen that this technique has better results than the former if all the systems are synchronised but, if not, there is an increment of the interference that produces a loss of capacity. This paper focuses on the effects of desynchronisation between systems sharing the same frequencies.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128461134","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
Managing mobile communication network for performance 管理移动通信网络的性能
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655529
Hyung-Deug Bae
{"title":"Managing mobile communication network for performance","authors":"Hyung-Deug Bae","doi":"10.1109/ICPWC.1997.655529","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655529","url":null,"abstract":"This paper presents a management model for handling performance degradation of cellular mobile network due to service failure of an entire or partial cell. It provides a simple and practical method for deployment of performance management control functions. The model consists of monitoring, analysing, controlling and tracing phases. The criteria and activities in each phase are discussed. The management model described is useful for predictable long-term traffic jamming of a single cell or cluster of cells.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116599070","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
A new multi-carrier CDMA/TDD transmission scheme based on cyclic extended spread code for 4th generation mobile communication system 一种基于循环扩展码的第四代移动通信系统多载波CDMA/TDD传输新方案
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655533
H. Harada, R. Prasad
{"title":"A new multi-carrier CDMA/TDD transmission scheme based on cyclic extended spread code for 4th generation mobile communication system","authors":"H. Harada, R. Prasad","doi":"10.1109/ICPWC.1997.655533","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655533","url":null,"abstract":"This paper proposes a fiber-optic and OFDM radio based mobile advanced communication system; which is called the FORMATION system. In this system, all microcellular base stations are connected with a fiber-optic bus link by using an optical coupler; and each base station and control station have only an electrical to optic converter, an optic to electrical converter and an OFDM transmitter and receiver. To manage the frequency band efficiently in one cellular, we communicate with other users by using MC-CDMA/TDD (multi-carrier code division multiple access/time division duplex). Therefore we propose a new MC-CDMA/TDD system that is suitable for the FORMATION system. The proposed MC-CDMA/TDD system uses cyclic extended code division multiplex and it is very easy to synchronize the code and FFT start point at the OFDM receiver. This paper explains the basic concept of the FORMATION system and the new MC-CDMA/TDD system, and evaluates the basic BER performance of proposed MC-CDMA system.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127128805","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: 5
Impacts of handoff on TCP performance in mobile wireless computing 移动无线计算中切换对TCP性能的影响
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655504
A. Chan, D. Tsang, S. Gupta
{"title":"Impacts of handoff on TCP performance in mobile wireless computing","authors":"A. Chan, D. Tsang, S. Gupta","doi":"10.1109/ICPWC.1997.655504","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655504","url":null,"abstract":"The effects of intermittent disconnections due to host motions on the performance of the TCP connections are investigated. Fading and handoff due to host motion cause increased the delay and packet losses to the active transport layer connection. The TCP interprets these as signs of network congestion. As a result, it promptly throttles its transmissions and backoffs its timers, leading to slow post-handoff recovery of the transmission and long idle time. These cause severe end-to-end throughput degradation and unreasonably long interactive delay for human interaction. We present three phenomena observed (long communication pause, slow post-handoff recovery, and successive timeouts) which are the main causes of the TCP performance degradation in the presence of handoff. To alleviate these effects on the TCP, two schemes, PROBE and BUFFER+FREEZE, are proposed. PROBE makes the TCP aware of mobility and adapts the protocol to the mobile environment. Whereas; BUFFER+FREEZE tries to hide the effects of motion from TCP by buffering at the basestation and freezing the action of the TCP source.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127422304","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: 16
Adaptive binary coding for diversity communication systems 分集通信系统的自适应二进制编码
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655483
M. Kousa, S. Al-Semari
{"title":"Adaptive binary coding for diversity communication systems","authors":"M. Kousa, S. Al-Semari","doi":"10.1109/ICPWC.1997.655483","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655483","url":null,"abstract":"Coding and diversity are two powerful techniques to combat fading effects on communication channels. In this paper the available diversity channels are utilized by forward error correction coding in an adaptive fashion to improve the reliability of the system. Based on the quality of the diversity channels, the code rate over each channel is determined using discrete optimization of the overall error probability, subject to the constraint of fixed overall throughput rate. It is found that the proposed system provides noticeable gain over the classical diversity system when binary BCH codes with hard-decision decoding are used. Moreover, the proposed system offers flexibility in choosing the throughput of the system, which the diversity system lacks. The advantages of the proposed system are obtained at only slight increase in implementation complexity.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115600621","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: 4
Design of a personal communication services network (PCSN) for optimum location area size 基于最佳位置面积的个人通信服务网络(PCSN)的设计
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655551
Debashis Saha, A. Mukherjee, P. Bhattacharya
{"title":"Design of a personal communication services network (PCSN) for optimum location area size","authors":"Debashis Saha, A. Mukherjee, P. Bhattacharya","doi":"10.1109/ICPWC.1997.655551","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655551","url":null,"abstract":"We have considered a design algorithm for a personal communication services (PCS) network. The algorithm is based on the fluid flow model of mobility analysis and a subgradient heuristic. The design objective is to optimize the location area size subject to the constraint of minimum boundary crossings per unit time because the low frequency of the crossings implies less handovers and less updates in the location database registers. Mathematically, the design task has been formulated as a two-variable non-linear optimization problem which has been solved with the help of Lagrangean relaxation combined with an efficient subgradient heuristic. The experimental results indicate that, for a fixed number of location areas, the optimum location area size does not change significantly with the terminal velocity. Moreover, by selecting the proper density and optimum location area size, the number of crossings can be restricted to the order of tens per hour, which is quite manageable.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":" 42","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113948013","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: 8
A hierarchical object-oriented global traffic model for simulation of mobile satellite communication networks 移动卫星通信网络仿真的分层面向对象全局流量模型
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655526
G. Schorcht, U. Freund, H. Salzwedel, H. Keller
{"title":"A hierarchical object-oriented global traffic model for simulation of mobile satellite communication networks","authors":"G. Schorcht, U. Freund, H. Salzwedel, H. Keller","doi":"10.1109/ICPWC.1997.655526","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655526","url":null,"abstract":"We present a method to realize geographic network traffic simulation models. Our approach is based on a hierarchy of traffic producing objects. It uses the polymorphic concept of the object-oriented programming paradigm to realize a traffic simulation model for traffic sink, and sources with arbitrary properties. We used the method to develop a global traffic model with hierarchical structure that can be used for mobile satellite communications system performance studies.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125694453","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: 6
Recursive channel estimation for wireless communication via the EM algorithm 基于EM算法的无线通信递归信道估计
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655473
H. Zamiri-Jafarian, S. Pasupathy
{"title":"Recursive channel estimation for wireless communication via the EM algorithm","authors":"H. Zamiri-Jafarian, S. Pasupathy","doi":"10.1109/ICPWC.1997.655473","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655473","url":null,"abstract":"The on-line expectation-maximization (EM) algorithm along with stochastic approximations are employed in this paper to estimate unknown time-invariant/variant parameters recursively in an adaptive manner based on the maximum likelihood (ML) criterion. The impulse response of a linear transmission channel is modeled in different ways; as an unknown deterministic vector/process and as an Gaussian vector/process with unknown stochastic characteristics. In association with these channel impulse response (CIR) models, different types of recursive least squares (RLS) and Kalman filtering and smoothing algorithms are derived directly from the on-line EM algorithm. The EM algorithm as a powerful tool unifies the derivations of some adaptive estimation methods (which include RLS and Kalman) whose original criterion is minimum mean square error (MMSE), but under linear and Gaussian conditions can achieve ML or maximum a posterior (MAP) criterion.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134550907","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: 12
A new efficient method of generating processor load data and meta data base in CMS-MX system CMS-MX系统中处理器负载数据和元数据库生成的一种新的高效方法
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655539
Jaewook Shin, Kwangroh Park, N. Lee, Daljin Bae
{"title":"A new efficient method of generating processor load data and meta data base in CMS-MX system","authors":"Jaewook Shin, Kwangroh Park, N. Lee, Daljin Bae","doi":"10.1109/ICPWC.1997.655539","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655539","url":null,"abstract":"A distributed real-time data base management system has been used in CDMA mobile system-mobile exchange (CMS-MX) system, where the data base schema and initial data base are constructed from exchange data input form (EDIF) files and data input language (DIL) files. In this paper, we propose a new efficient method of generating meta data base (MDB) and processor load data (PLD) from EDIF files and DIL files. The proposed method provides strong verification capabilities to guarantee the consistency of data base schema. It also reduces the data base construction time by simplifying its process.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132961113","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
FRAMES multiple access, a harmonized radio interface 帧多址，一个协调的无线电接口
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655519
W. Mohr
{"title":"FRAMES multiple access, a harmonized radio interface","authors":"W. Mohr","doi":"10.1109/ICPWC.1997.655519","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655519","url":null,"abstract":"Currently world-wide activities are going on to define third generation mobile radio systems (FPLMTS/IMT-2000 in the ITU and UMTS in the ETSI in Europe). These systems aim to support a wide range of services including voice, low rate up to high rate data services (multimedia services). Circuit and packet oriented services will be supported. Third generation systems will be operated in all radio environments to provide a service to anyone, anytime and anywhere. In Europe the European Commission is partly funding research activities in the ACTS framework related to the third generation systems. A spectrum efficient multiple access scheme proposal is developed by the ACTS FRAMES project to fulfil the requirements on terrestrial third generation mobile radio systems. The results and proposals of FRAMES are used as input mainly to the ETSI standardization process in Europe. This radio access scheme addresses the different world-wide standardization activities where wideband TDMA-based and wideband CDMA-based solutions are currently to be expected.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129455587","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: 2
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