1997 IEEE 47th Vehicular Technology Conference. Technology in Motion最新文献

System architecture for the MOSTRAIN project (mobile services for high speed trains) MOSTRAIN项目(高速列车移动服务)的系统架构

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605892

J. Irvine, J. Couvy, F. Graziosi, J. Laurila, G. Mossakowski, P. Robin

引用次数: 11

Smart antennas for the GSM system: experimental results for a mobile reception GSM系统的智能天线:移动接收的实验结果

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605822

P. Chevalier, F. Pipon, J. Monot, C. Demeure

引用次数: 21

Effects of transmitter, receiver and channel impairments on the performance of the enhanced IS-136 digital cellular system for transmission of high-quality speech 发射机、接收机和信道损伤对增强型IS-136数字蜂窝系统传输高质量语音性能的影响

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596397

Z. Kostic, N. A. Abbasi

{"title":"Effects of transmitter, receiver and channel impairments on the performance of the enhanced IS-136 digital cellular system for transmission of high-quality speech","authors":"Z. Kostic, N. A. Abbasi","doi":"10.1109/VETEC.1997.596397","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596397","url":null,"abstract":"An enhanced version of the IS-136 American digital cellular system is studied, which is designed to handle low delay high-quality 16 kb/s encoded speech for low-speed mobility indoor wireless communications. Physical layer modifications which are implemented include replacing the /spl pi//4 DQPSK modulation with the /spl pi//8-DSPSK modulation, changing the channel encoding approach as well as requiring the antenna diversity in the receiver. Much of the IS-136 slot and frame structure is preserved. The effects of channel, transmitter and receiver impairments on the performance of the system are studied through simulations. An incoherent differential detector and a coherent detector with differential decoding are evaluated. Simulation results show that slot error rates of 1% are achievable for SNRs around 25 dB for the worst considered case of Rayleigh fading with 10 Hz Doppler, 5 degrees of RMS phase noise in the transmitter and receiver each, and for two antenna preselection diversity when the difference in antenna signal strengths is equal to 3 dB. For 1 Hz Doppler and smaller RMS values of phase noise, the same slot error rate is achievable for close to 20 dB SNR.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120960605","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

Carrier synchronization with CEPB-OFDM 载波同步与CEPB-OFDM

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605430

R. Dinis, A. Gusmão

引用次数: 7

Signal space representation of indirect cochannel interference canceller 间接共信道干扰消除器的信号空间表示

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596336

Reza Berangi, P.S.K. Leung, Michael Faulkner

引用次数: 2

Data detection and channel allocation on the uplink of an SDMA mobile radio system 在SDMA移动无线电系统上行链路上的数据检测和信道分配

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.606004

C. Farsakh, J. Nossek

引用次数: 14

Wireless access for adaptive video applications 自适应视频应用的无线接入

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605904

H. Morikawa

{"title":"Wireless access for adaptive video applications","authors":"H. Morikawa","doi":"10.1109/VETEC.1997.605904","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605904","url":null,"abstract":"This paper presents a wireless access framework for real-time VBR (variable bit rate) transport for next-generation multiservice personal communication networks. We introduce an adaptive VBR service suitable for the mobile networks, where the network provides minimum bandwidth guarantees, and assigns \"leftover\" bandwidth on a best-effort basis. An adaptive VBR service will help to ease the bandwidth management in the network through guaranteeing only minimum bandwidth. In order to fit this service, we design a layer source coder that separates VBR signal components into a CBR (constant bit rate) portion and a VBR portion. Specific resource allocation procedures are outlined for video traffic coded with a H.283 type two-layer codec and voice traffic generated on a talkspurt-by-talkspurt basis. The protocol is designed with the basic premise that there is a relatively large number of unused voice slots on average that can be used to carry \"add-on\" video packets. Numerical examples show that prioritized video transport under consideration can significantly improve picture quality, and allow better utilization of wireless resources through statistical multiplexing.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"06 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127353244","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

Using ray tracing for site-specific indoor radio signal strength analysis 使用光线追踪进行特定地点的室内无线电信号强度分析

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600438

M. Nidd, S. Mann, J. Black

引用次数: 18

Transmitter diversity with antenna hopping for wireless communication systems 无线通信系统中带天线跳频的发射机分集

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605857

H. Olofsson, M. Almgren, M. Hook

{"title":"Transmitter diversity with antenna hopping for wireless communication systems","authors":"H. Olofsson, M. Almgren, M. Hook","doi":"10.1109/VETEC.1997.605857","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605857","url":null,"abstract":"Transmitter diversity is an attractive means for improving the performance of the downlink in a cellular system. This paper investigates one of these methods, referred to as antenna hopping, which consists in transmitting consecutive bursts of information on different antennas. Provided that the antenna branches are exposed to different multipath fading, a gain is achieved. Results from simulation of the GSM TCH/FS (full rate speech channel) reveal that the gain of hopping on two uncorrelated antennas is 2.9 dB for low speed terminals in an urban environment, and 5.4 dB for an indoor environment with semi-stationary users. The maximal gain is shown to be reduced at high cross-correlation and difference in path loss between the antenna branches. Antenna hopping combined with frequency hopping is shown to further enhance performance. With antenna hopping on two antennas, the maximal gain can be obtained by using frequency hopping on only 4 frequencies instead of 8 without antenna hopping. Finally, a comparison is made with delayed transmitter diversity, which is shown to have no essential advantages over antenna hopping at low terminal speed, which is the situation where diversity is really needed.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124830166","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: 42

A new handover decision algorithm for microcellular systems 一种新的微蜂窝系统切换决策算法

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596371

B. Senadji

引用次数: 14