发布求助
文献互助 智能选刊 最新文献

Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97最新文献

筛选
英文 中文
Multi-frame packet reservation multiple access for variable-rate multimedia users 可变速率多媒体用户的多帧包保留多址
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.630968
J. Brecht, L. Hanzo, M. D. Buono
{"title":"Multi-frame packet reservation multiple access for variable-rate multimedia users","authors":"J. Brecht, L. Hanzo, M. D. Buono","doi":"10.1109/PIMRC.1997.630968","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.630968","url":null,"abstract":"Multi-frame packet reservation multiple access or MF-PRMA is proposed for supporting multi-rate, multi-media users in high-rate systems employing time-division multi-frames. PRMA and MF-PRMA are compared for a variety of traffic scenarios using optimised system parameters.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121042948","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
Investigating the effects of antenna directivity on wireless indoor communication at 60 GHz 研究天线指向性对60ghz无线室内通信的影响
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.631109
M. Williamson, G. Athanasiadou, A. Nix
{"title":"Investigating the effects of antenna directivity on wireless indoor communication at 60 GHz","authors":"M. Williamson, G. Athanasiadou, A. Nix","doi":"10.1109/PIMRC.1997.631109","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631109","url":null,"abstract":"This paper investigates the nature of the indoor radio channel at 60 GHz, with regard to its use for future high bit-rate broadband wireless networks. It is proposed that, for operation in the millimetre-wave indoor channel, directional antennas can be used to mitigate multipath effects, thus reducing the need for complex equalisation or multi-carrier techniques. An image based, ray-tracing prediction model is used to study the channel characteristics and to analyse the variation in received power, RMS delay spread and k-factor within a typical operating environment. The performances of different antenna combinations are investigated and narrowbeam, suitably aligned antennas are shown to reduce received delay spread for both LOS and non-LOS locations. The effects of non-optimal antenna alignment are observed, and system outage is determined for certain system design criteria. The results suggest that it will feasible to combat multipath effects using switched-beam directional antennas.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114076130","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: 70
Performance analysis of cellular digital mobile radio systems including diversity techniques 包括分集技术的蜂窝数字移动无线电系统性能分析
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.630898
W. Hollemans, R. Prasad, A. Kegel
{"title":"Performance analysis of cellular digital mobile radio systems including diversity techniques","authors":"W. Hollemans, R. Prasad, A. Kegel","doi":"10.1109/PIMRC.1997.630898","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.630898","url":null,"abstract":"The performance of cellular digital mobile radio systems is investigated using quadrature amplitude modulation (4-QAM) and differential phase shift keying (DPSK) in a frequency nonselective Rayleigh fading environment with lognormal shadowing, including the effects of (white) Gaussian noise, narrow-band impulsive noise/interference (Middleton's Class A model), and cochannel interference. The performance is analyzed in terms of probability of bit error. The UHF groundwave propagation law is introduced by considering the local mean power to be inversely proportional to the fourth power of propagation distance. To investigate the improvement in performance the influence of selection diversity and maximal ratio combining on the bit error probability is analyzed. It has been found that shadowing significantly affects the bit error performance. Application of selection diversity or maximal ratio combining results in important improvement of system performance. Selection diversity gives better results than maximal ratio combining for low signal-to-noise ratios. Results of our analysis show maximal ratio combining is not that sensitive to unequal branch signal-to-noise-plus-interference ratio.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122501189","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
Equalisation and frequency offset correction for HIPERLAN HIPERLAN的均衡和频偏校正
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.626995
C. Tellambura, I. Johnson, Y. Guo, S. Barton
{"title":"Equalisation and frequency offset correction for HIPERLAN","authors":"C. Tellambura, I. Johnson, Y. Guo, S. Barton","doi":"10.1109/PIMRC.1997.626995","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.626995","url":null,"abstract":"To reduce the effects of intersymbol interference resulting from the dispersive nature of the indoor radio channel most HIPERLAN receivers will incorporate an adaptive equaliser. The computational complexity of several equaliser algorithms is estimated. The effect of frequency offset between the transmitter and receiver on the performance of such an equaliser is investigated. By employing a decision feedback equaliser incorporating a second order phase locked loop, the effect of both the intersymbol interference and frequency offset can be significantly reduced. Using such a technique, the packet error ratio (PER) of a HIPERLAN radio link in a multipath channel is found by simulation.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122619776","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
Outage probability of a cellular hybrid DS/SFH CDMA system 蜂窝混合DS/SFH CDMA系统的中断概率
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.624399
S. Grujev, R. Prasad
{"title":"Outage probability of a cellular hybrid DS/SFH CDMA system","authors":"S. Grujev, R. Prasad","doi":"10.1109/PIMRC.1997.624399","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624399","url":null,"abstract":"The paper presents the performance analysis in terms of outage probability of a cellular hybrid DS/SFH CDMA system for the analytical channel model. The mobile-to-base link is modelled as a Rayleigh fading channel with all users experiencing independent fading. The standard receiver for CDMA systems is susceptible to the near-far effect problem. Power control techniques attempt to overcome near-far effect by varying transmitted power levels to ensure that all signals are received with equal power levels. We evaluated the performance for given a bit rate in a situation with and without power control and selection diversity. Since the power control algorithms cannot perfectly compensate for power fluctuations in a mobile communications channel, the performance of the system is reduced for a given BER. This paper examines the effect of imperfect power control on the number of users by extending analytical techniques that account for multiple access and adjacent cell interference.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129568196","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
Near single user performance using iterative multi-user detection for CDMA with turbo-code decoders 基于迭代多用户检测的CDMA turbo码解码器近单用户性能
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.631179
M. Reed, P. Alexander, J. Asenstorfer, C. Schlegel
{"title":"Near single user performance using iterative multi-user detection for CDMA with turbo-code decoders","authors":"M. Reed, P. Alexander, J. Asenstorfer, C. Schlegel","doi":"10.1109/PIMRC.1997.631179","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631179","url":null,"abstract":"This paper discusses a code-division multiple access (CDMA) iterative multi-user receiver with forward error control (FEC) decoding. The maximum a-posteriori probability (MAP) criteria is used to derive the receiver. The decoding is done using a turbo-code decoder with modifications which are discussed. Iterations of the system are used to attain large performance improvements over conventional systems.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128055769","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: 24
Joint interference cancellation and Viterbi decoding in DS-CDMA DS-CDMA 中的联合干扰消除和 Viterbi 解码
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.627068
M-Reza Koohrangpour, A. Svensson
{"title":"Joint interference cancellation and Viterbi decoding in DS-CDMA","authors":"M-Reza Koohrangpour, A. Svensson","doi":"10.1109/PIMRC.1997.627068","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627068","url":null,"abstract":"Direct-sequence code-division multiple access (DS-CDMA) is a popular wireless technology. In DS-CDMA communications, all of the users' signals overlap in time and frequency and cause mutual interference. In this paper a novel multi-user decoding scheme for coded synchronous DS-CDMA is proposed. The decoder performs joint successive interference cancellation (SIC) and Viterbi decoding (VD) in each step of the interference cancellation. In a conventional SIC scheme, SIC is performed first, followed by VD that uses the outputs of the last stage of the SIC scheme for metric calculation. Simulated bit error probability for the proposed scheme is presented and compared with bit error probability of a conventional scheme. A capacity increase of at least 4 compared to SIC followed by VD is reported in one example.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128479090","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: 15
Phase noise in a direct sequence based channel sounder 基于直接序列的信道测深器中的相位噪声
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.627059
J. Kivinen, P. Vainikainen
{"title":"Phase noise in a direct sequence based channel sounder","authors":"J. Kivinen, P. Vainikainen","doi":"10.1109/PIMRC.1997.627059","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627059","url":null,"abstract":"This paper describes the problems caused by the phase noise in the development of micro- and millimeterwave range crosscorrelation type wideband channel sounders. The procedure to estimate the phase noise and its effect on the dynamic range of the impulse response measurement is given. It can be seen that the effect of the phase noise becomes more significant as the measurement frequency increases. With typical components a dynamic range of 35 dB was estimated at 60 GHz.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121623705","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
Source-matched channel coding and networking techniques for mobile communications 用于移动通信的源匹配信道编码和网络技术
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.631154
F. Babich, F. Vatta
{"title":"Source-matched channel coding and networking techniques for mobile communications","authors":"F. Babich, F. Vatta","doi":"10.1109/PIMRC.1997.631154","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631154","url":null,"abstract":"The bit-stream generated by most source coding algorithms, for voice, audio and images, usually consists of bits of different significance and error sensitivity. By exploiting this property, in the design of a wireless communication system, it is possible to obtain significant advantages. First, the network capacity can be increased, with a smoother quality degradation under heavy traffic or severe interference conditions. Secondly, the application of source sensitivity matched FEC (forward error correction) protection schemes, leads to a higher robustness of source bits to channel impairments. We evaluate the usefulness of prioritized, variable-rate speech encoding schemes, for handling congestion over packet switching systems. The system performance is shown to be sensitive to the fraction of information placed in each priority and to the number of priorities. The applicability of source-sensitivity matched error protection schemes, for variable-rate speech transmission on a radio channel, is also investigated.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"66 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120842345","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 performance analysis of TDMA and CDMA based air interface solutions for UMTS high bit rate services 基于TDMA和CDMA的UMTS高比特率业务空中接口解决方案的性能分析
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.624356
K. Pehkonen, H. Holma, I. Keskitalo, E. Nikula, T. Westman
{"title":"A performance analysis of TDMA and CDMA based air interface solutions for UMTS high bit rate services","authors":"K. Pehkonen, H. Holma, I. Keskitalo, E. Nikula, T. Westman","doi":"10.1109/PIMRC.1997.624356","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624356","url":null,"abstract":"Universal Mobile Telecommunications System (UMTS) has a target maximum user bit rate of 2 Mbit/s. We present a performance comparison between four TDMA schemes and one CDMA scheme that all can provide the required user data rate. Evaluation considers link level performance, noise limited uplink range and cellular capacity. Three different environments, indoor large room, street micro cell and urban macro cell, have been used. Results show that when sophisticated methods are utilized schemes based on both TDMA and CDMA access methods can provide very similar performance for implementing UMTS high bit rate services when many different environments are considered.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"5 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121349479","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: 14
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信