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MIMO capacity performance for both narrowband and wideband systems 窄带和宽带系统的MIMO容量性能
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182510
Lim Wei Chee, B. Kannan, F. Chin
{"title":"MIMO capacity performance for both narrowband and wideband systems","authors":"Lim Wei Chee, B. Kannan, F. Chin","doi":"10.1109/ICCS.2002.1182510","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182510","url":null,"abstract":"Recent study in information-theory has demonstrated the enormous capacity potential of wireless communication system with multiple transmit and receive antennas. As a result, a number of layered space-time (BLAST) architectures have been proposed. In this paper, the capacity of narrowband and wideband (OFDM) systems in scattering channel models are analysed via Monte-Carlo simulations. In particular, we show that OFDM based MIMO system can combat pin-hole effect which degrades capacity.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128469041","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
A time-based binding update in mobile IP networks with very high mobility 在移动IP网络中具有很高移动性的基于时间的绑定更新
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183288
H. Kim, J. Song
{"title":"A time-based binding update in mobile IP networks with very high mobility","authors":"H. Kim, J. Song","doi":"10.1109/ICCS.2002.1183288","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183288","url":null,"abstract":"Wthe e propose a time-based binding network model for efficient binding in mobile IPv6. We try to reduce the waste of link bandwidth or the processing load of a correspondent node and a home agent by binding every periodic time unit, t. This mechanism can show various advantages in the case of high mobility. The results of performance analysis show that the network load concentrated on a correspondent node or a home agent is decreased in time-based binding update model, and also our model is better than a mobile IPv6 model with regard to processing delay.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128540539","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
Information security standards for e-businesses 电子商务的信息安全标准
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183205
M.M. Sattid, B. Garner, M. Nagrial
{"title":"Information security standards for e-businesses","authors":"M.M. Sattid, B. Garner, M. Nagrial","doi":"10.1109/ICCS.2002.1183205","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183205","url":null,"abstract":"The process of buying, selling or interacting with customers via Internet, Tele-sale, Smart card or other computer network is referred to as electronics commerce. Whereas online trade has been touting its flexibility, convenience and cost savings, the newest entrant is wireless e-commerce. This form of business offers many attractions; including 24 hours seven days' open shop-business, vastly reduced fixed cost, and increased profitability, Amazon.com is an example of a successful venture, in e-business. Internet service providers (ISP/ASP) have a significant influence on the feasibility, security and cost competitiveness of an e-business venture. In the ISP model of services, multiple users and their databases are normally offered on a single hardware, platform sharing the same IP address and domain name. Clients will require a mechanism, which allows them to update their Web contents and databases frequently even many times daily without intervention of local system administrator (ISP admin). The paper overviews few steps to enable corporate clients to update their Web content more securely.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128296078","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
A novel frequency-domain frame synchronization algorithm for digital communication systems 一种新的数字通信系统频域帧同步算法
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183239
Y. Wang, Y. L. Guan, T. Lie, S. Chen, E. Gunawan, P. L. So
{"title":"A novel frequency-domain frame synchronization algorithm for digital communication systems","authors":"Y. Wang, Y. L. Guan, T. Lie, S. Chen, E. Gunawan, P. L. So","doi":"10.1109/ICCS.2002.1183239","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183239","url":null,"abstract":"A novel frequency-domain frame synchronization algorithm based on phase-only FFT operation is proposed and studied. Compared to the conventional time-domain approach based on sliding correlation detection, the proposed phase-only FFT algorithm is shown to be capable of achieving considerable performance advantage in channels with linear phase variation, as well as in Rayleigh fading channels. In addition, it is also shown to enjoy significantly lower computational complexity.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129264466","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
Channel estimation from known preamble sequences 从已知的前导序列估计信道
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182479
K. Raja Rajeswari, N. Gangatharan, E. MorrisG, G.S.V. Radhakrishna Rao, B. Visvesvara Rao, G. N. Swamy
{"title":"Channel estimation from known preamble sequences","authors":"K. Raja Rajeswari, N. Gangatharan, E. MorrisG, G.S.V. Radhakrishna Rao, B. Visvesvara Rao, G. N. Swamy","doi":"10.1109/ICCS.2002.1182479","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182479","url":null,"abstract":"The least sum of squared estimation (LSSE)channel estimation algorithm is applied for determining a channel impulse response from known preamble sequences. Optimum training sequences are designed for different channel responses and training sequence lengths. The effect of channel estimation errors on the performance of some data detectors is also investigated. As a special case some non-maximal length sequences and ternary sequences (with alphabet 0, /spl plusmn/1) are also considered for performance evaluation.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124603814","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
Recursive blind estimation and equalization of time-varying channel based on parametric model 基于参数模型的时变信道递归盲估计与均衡
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182443
Zheng Yuanjin
{"title":"Recursive blind estimation and equalization of time-varying channel based on parametric model","authors":"Zheng Yuanjin","doi":"10.1109/ICCS.2002.1182443","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182443","url":null,"abstract":"This paper proposes a new technique for recursive blind equalization of a time-varying IIR communication channel to obtain simultaneous estimation of channel impulse response and input symbols. The received sequences are represented as the output of a noisy non-Gaussian time-varying parametric model. A pseudo maximum likelihood estimation algorithm is proposed for the identification of channel parameters. The blind equalization is implemented by three algorithms: the recursive channel estimation algorithm, the Gaussian-mixture parameter estimation algorithm and the standard Kalman filtering algorithm. The equalization results are good even on low SNR received sequence and fast fading channel.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130411354","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
BER sensitivity of OFDM systems to time synchronization error OFDM系统对时间同步误差的误码率敏感性
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1182434
C. Athaudage
{"title":"BER sensitivity of OFDM systems to time synchronization error","authors":"C. Athaudage","doi":"10.1109/ICCS.2002.1182434","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1182434","url":null,"abstract":"This paper presents the details of a simulation based study performed to investigate the BER performance degradation (sensitivity) of OFDM systems due to time synchronization error at the demodulator. It is shown that an OFDM system incorporating a cyclic prefix (CP) has an asymmetric effect on the received constellation with synchronization error away from CP introducing intersymbol interference (ISI), while that towards the CP introducing only a phase error. We approximate the time synchronization error by a Gaussian distributed random variable, in order to evaluate the BER sensitivity of OFDM systems to timing error. The BER performance was evaluated for an AWGN channel and a multipath fading channel in terms of the synchronization error variance. The results of this investigation will be useful in developing time synchronization algorithms in OFDM systems to achieve a particular BER performance target for a given channel condition.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126862294","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: 59
Measurement-based aggregate throughput of Bluetooth system in limited area 基于测量的蓝牙系统在有限区域内的总吞吐量
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183203
O. Karjalainen, S. Rantala, M. Kivikoski
{"title":"Measurement-based aggregate throughput of Bluetooth system in limited area","authors":"O. Karjalainen, S. Rantala, M. Kivikoski","doi":"10.1109/ICCS.2002.1183203","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183203","url":null,"abstract":"This paper presents measurement-based calculations for actual aggregate and link throughputs of Bluetooth system. The co-interference between fully loaded piconets formed in a 10*10 sq. meter room is inspected. The results show that the maximum aggregate throughput is gained with 45 active piconets. When comparing the ideal performance with the one based on measured results best overall performance over a distance of 10 meters can be achieved using DM5, DM3 and DH1 packets for data transfer. When the distance is less than 3 meters the use of only DH packets gives the best results.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123633351","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 packet pre-classification CSMA/CA MAC protocol for IP over WDM ring networks 一种WDM环网IP的分组预分类CSMA/CA MAC协议
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183327
Wen-Ping Chen, W. Hwang
{"title":"A packet pre-classification CSMA/CA MAC protocol for IP over WDM ring networks","authors":"Wen-Ping Chen, W. Hwang","doi":"10.1109/ICCS.2002.1183327","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183327","url":null,"abstract":"A packet pre-classification MAC (media access control) protocol based on carrier sense multiple access with collision avoidance (CSMA/CA) scheme has been investigated for supporting IP packet over the all-optical WDM ring networks. The intention of the protocol is to increase throughput of IP over optical networks in metropolitan area network (MAN). This protocol avoids both packet collision and packet fragmentation. In order to improve the utilization of network, the packets transmitted from local area network (LAN) are pre-classified into various class queues of access point (AP) according their length. Simulations had been done to evaluate the performance of the protocol, and the simulation results show extraordinarily good network efficiency.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121388466","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: 9
The design of a highly-available file server group 高可用性文件服务器组的设计
The 8th International Conference on Communication Systems, 2002. ICCS 2002. Pub Date : 2002-11-25 DOI: 10.1109/ICCS.2002.1183210
Feng-jung Liu, Chun-wei Tseng, Chu-Sing Yang
{"title":"The design of a highly-available file server group","authors":"Feng-jung Liu, Chun-wei Tseng, Chu-Sing Yang","doi":"10.1109/ICCS.2002.1183210","DOIUrl":"https://doi.org/10.1109/ICCS.2002.1183210","url":null,"abstract":"The explosive growth of the Web contents has led to increasing attention on two major challenges: scalability and high availability of network file system. We introduced the concept of intermediate file handling to improve the availability of the NFS-based file system and proposed a new data consistency scheme to improve our design of a reliable file system, which had been implemented as an example of the software replication approach. By using a minor sequence in token getting, the total number of getting-token requests is reduced along with the data-requested size for each write operation. We also proposed a simple load-sharing mechanism for the NFS client to switch to a lightly-load server based on the number of NFS client's RPC requests for a period of time. Such an approach is easy to derive the load information, which each client generated. Finally, we analysed the proposed data consistency scheme. It shows truly that the scheme is able to reduce the overhead of write requests of our network file system.","PeriodicalId":401041,"journal":{"name":"The 8th International Conference on Communication Systems, 2002. ICCS 2002.","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116350184","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
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