2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)最新文献_第9页

A ray-tracing method for predicting delay spread in tunnel environments 隧道环境中延迟传播预测的射线追踪方法

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905917

M. H. Kermani, M. Kamarei

{"title":"A ray-tracing method for predicting delay spread in tunnel environments","authors":"M. H. Kermani, M. Kamarei","doi":"10.1109/ICPWC.2000.905917","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905917","url":null,"abstract":"Our model to predict the propagation is based on ray-tracing which uses an images algorithm to find paths between transmitter and receiver of a digital communication system. It accounts for all rays reaching the receiver location after an arbitrary number of reflections and includes the effect of the angle of incidence, the material dielectric constant, the antenna pattern and polarization, the wall roughness, and the tunnel cross section size. The simulation results in this paper are obtained by analyzing many fewer rays compared to other published results. The results illustrate that in an empty straight rectangular tunnel environment, propagation has a very short time delay spread. Meanwhile, the results have shown that rms delay spread for horizontally polarized transmit and receive antennas is more than for vertically polarized transmit and receive antennas, in which the attenuation constant is less when transmit and receive antennas are horizontally polarized than when they are vertically polarized. Finally, by using a specific pattern, the rms delay spread is decreased compared to an isotropic antenna.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130879338","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: 30

BER analysis of a set of TCM schemes for reducing cochannel interference in cellular mobile communication 一组用于减少蜂窝移动通信中共信道干扰的TCM方案的误码率分析

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905791

A. Asati, R. Bose

引用次数: 0

Random early blocking in hierarchical microcellular networks 分层微蜂窝网络中的随机早期阻塞

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905920

Shun-Ping Chung, Jin-Chang Lee

引用次数: 0

A tool to calculate Erlang capacity of a BTS supporting 3G UMTS system 计算支持3G UMTS系统的BTS Erlang容量的工具

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905797

V. Garg, R. Yellapantula

{"title":"A tool to calculate Erlang capacity of a BTS supporting 3G UMTS system","authors":"V. Garg, R. Yellapantula","doi":"10.1109/ICPWC.2000.905797","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905797","url":null,"abstract":"The second-generation (2G) wireless systems are primarily designed for voice services. The cell capacity is obtained by simulation for the given mobile environment. The cell capacity is used in network planning. The proposed 3G wireless systems mainly address data services. A 3G system allows users to use multimedia services. Therefore, there can be several different combinations of the voice and data services that may occur at a base station transceiver (BTS). This will require major time-consuming simulations to obtain the Erlang capacity of the BTS for all possible combinations of the services and will complicate the network planning process. The objective of this paper is to present a simple tool that analytically models a BTS. We do not have to depend on major simulations to obtain the BTS capacity for the given set of services. We develop the Erlang capacities of a BTS for voice services, real-time (circuit-switched) and non-real-time (packet-switched) data services. We use the capacity figures of the uplink and downlink with the link budget to calculate the maximum cell radius for each service type in an urban environment. We show the effect of uplink and downlink information bit rate on the cell radius.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"770 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123004246","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

Advantages of SiGe-HBTs for RF wireless communication sige - hbt在射频无线通信中的优势

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905763

B. Senapati, C. K. Maiti

引用次数: 1

Mobile IP for 3G wireless networks 3G无线网络的移动IP

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905811

V. Garg, H. Tejwani

引用次数: 2

Smart proxy: reducing latency for HTTP based Web transfers across satellite links 智能代理:减少跨卫星链路基于HTTP的Web传输的延迟

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905924

Abhay Chrungoo, V. Gupta, H. Saran, R. Shorey

{"title":"Smart proxy: reducing latency for HTTP based Web transfers across satellite links","authors":"Abhay Chrungoo, V. Gupta, H. Saran, R. Shorey","doi":"10.1109/ICPWC.2000.905924","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905924","url":null,"abstract":"Hypertext Transfer Protocol (HTTP), the prevalent application layer protocol in the Internet has had a major role in the widespread and easy access to the Internet. With the increasing amount of data transfer over the Internet, satellite links are increasingly being used for Web-transfers. Web documents such as HTML pages generally reference multiple files to display a page. HTTP gets all these documents sequentially, thus increasing latency. Due to large round trip times over satellite links, the delays become unacceptably high. The smart proxy approach uses a proxy server at both the receiver and sender side to implement parsing, caching and prefetching of referenced documents on the sender side and caching at receiver side. UDP (user datagram protocol) is used as the underlying transport layer protocol. More than three fold improvement is observed when the number of referenced files is small. We observe a further improvement with (i) an increase in the number of referenced documents and (ii) an increase in bit error rate in the satellite environment.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130939908","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

Information-theoretic aspects of subchannel allocation in ADSL systems supporting down-stream wireline/wireless trunks 支持下行有线/无线中继的ADSL系统中子信道分配的信息论问题

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905848

P. Neelakanta, A. Preechayasomboon

{"title":"Information-theoretic aspects of subchannel allocation in ADSL systems supporting down-stream wireline/wireless trunks","authors":"P. Neelakanta, A. Preechayasomboon","doi":"10.1109/ICPWC.2000.905848","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905848","url":null,"abstract":"An analytically, tractable information-theoretic model is proposed to determine optimal subchannel allocation in an ADSL system whose downstream modem has wireline and/or wireless trunks at its input. The relevant (downstream) ADSL modem at the central office is assumed to receive packets from different types of trunks, such as optical lines, copper cables and/or wireless links, or their concatenated version. From an information-theoretic point of view, this ADSL modem is modeled as a \"demultiplexer\" in the sense that it selects out a specific set of bits and assigns it to an appropriate subchannel consistent with the Hartley-Shannon law specified SNR-level of the subchannels. The pertinent analyses pursued in evaluating a subchannel allocation metric (SAM) refer to the following: microcellular-fed fiber with a specified BER as the incoming trunk on an ADSL system and FEXT-infested copper customer loop access lines. The resultant performance of downstream ADSL traffic on subchannels is ascertained by the metric, SAM. Simulated results are presented and discussed.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132940450","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

Explicit congestion notification (ECN) in TCP over wireless network 无线网络上TCP的显式拥塞通知(ECN)

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905907

R. Ramani, A. Karandikar

引用次数: 48

A new adaptive serial search PN code acquisition scheme for DS-CDMA systems 一种适用于DS-CDMA系统的自适应串行搜索伪码采集方案

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905812

R. Warsi, A. Chaturvedi

引用次数: 3