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11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)最新文献

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Measurement of subjective communication quality for optical mobile communication systems by using mean opinion score 用平均意见评分法测量光移动通信系统主观通信质量
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881635
Y. Itoh, K. Tajima, N. Kuwabara
{"title":"Measurement of subjective communication quality for optical mobile communication systems by using mean opinion score","authors":"Y. Itoh, K. Tajima, N. Kuwabara","doi":"10.1109/PIMRC.2000.881635","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881635","url":null,"abstract":"Since optical mobile communication systems do not radiate radio waves from the mobile terminals, they are expected to be used in environments containing sensitive electronic equipment. However, the placement and direction of the optical receivers must be suitably determined for mobile communication because light has high directivity. In optical mobile communication systems, the communication quality varies with the direction of the mobile terminal. Therefore, we examined the angle over which communication is possible at various measurement points and defined it as the communication angle. The mean opinion score (MOS) was obtained to assess the communication quality using the communication angle as a parameter. In this paper, two situations, walking and sitting down, were regarded as representing the way optical mobile communication systems are actually used. We found that for walking, when the communication angle was over 180 degrees, the MOS was over 3 and over 50% of users could communicate usefully. When a user was sitting down, the communication quality did not depend on the communication angle, but only on whether or not the user could communicate in the direction he/she was facing. Thus, if the communication angle in the service area is over 180 degrees, it is possible to communicate in practical situations, even while walking.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128612042","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
Multiple coverage for MBS environments MBS环境的多重覆盖
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881501
J. Fernandes, José Garcia
{"title":"Multiple coverage for MBS environments","authors":"J. Fernandes, José Garcia","doi":"10.1109/PIMRC.2000.881501","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881501","url":null,"abstract":"Shaped beam lens antennas designed for the ACTS SAMBA Trial Platform are briefly presented as well as the coverage performance parameters. Cell coverage simulation results are presented, both in indoor and outdoor scenarios chosen for the system trials. Multiple coverage using two BSTs operating at different frequencies and at the same frequency is addressed here and different cellular configurations are studied in order to properly cover typical indoor and outdoor scenarios. Several millimetre-wave propagation problems, such as shadow fading, channel time dispersion and power distribution throughout the cell are pointed out and some solutions are proposed.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129705048","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
Iterative joint symbol detection and channel estimation for DS/CDMA via the SAGE algorithm 基于SAGE算法的DS/CDMA迭代联合符号检测与信道估计
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881650
A. Kocian, B. Fleury
{"title":"Iterative joint symbol detection and channel estimation for DS/CDMA via the SAGE algorithm","authors":"A. Kocian, B. Fleury","doi":"10.1109/PIMRC.2000.881650","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881650","url":null,"abstract":"We present a method of tractable complexity for joint data detection and channel estimation of DS/CDMA signals. The scheme results from an application of the SAGE algorithm. Monte Carlo simulations of a synchronous scenario show that the method is near-far resistant and that it is robust against estimation errors of the channel parameters. Moreover, very short training sequences are required for the scheme to converge. Simulation results further demonstrate that a better performance is obtained when the users' bit sequences are cyclically updated in the order of increasing strength of the users' signals at the output of the whitening filter in the receiver.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124392421","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: 13
Turbo-coded blind per-survivor processing multiuser detection CDMA turbo编码盲每幸存者处理多用户检测CDMA
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881520
E. Kuan, L. Hanzo
{"title":"Turbo-coded blind per-survivor processing multiuser detection CDMA","authors":"E. Kuan, L. Hanzo","doi":"10.1109/PIMRC.2000.881520","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881520","url":null,"abstract":"Joint data and blind channel estimation based on the principle of per-survivor processing (PSP) is invoked and characterised in the proposed turbo-coded multiuser detection assisted code division multiple access (CDMA) system. The turbo-coded blind PSP receiver invoked the likelihood function in its metric calculations over the typical urban (TU) time-variant COST 207 fading channel fluctuating at Doppler frequencies between 0.8 Hz and 80 Hz. The size of the turbo interleaver was shown to be critical as regards to the overall system performance, and for a rectangular turbo interleaver size of 55/spl times/55 bits in conjunction with a 100/spl times/100-bit or 156/spl times/156-bit channel interleaver no transmission errors were recorded for the above two Doppler frequencies over the COST 207 TU fading channel.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127624931","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
On the performance of coexisting spread spectrum systems 共存扩频系统的性能研究
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881622
O. Queseth
{"title":"On the performance of coexisting spread spectrum systems","authors":"O. Queseth","doi":"10.1109/PIMRC.2000.881622","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881622","url":null,"abstract":"Wireless communication services may in the future be provided by a larger number of operators than provide the services today. A key enabling factor is the possibility to automatically share the radio spectrum. Bandwidth efficiency is defined as the number of users that can be supported by a base station in a given spectrum. The bandwidth efficiency in a DS-CDMA and a frequency hopping system is studied when two operators share the same spectrum. The influence of base station location is also studied. The results indicate a substantial loss for the DS-CDMA system and a lower loss for the frequency hopping system.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127694552","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: 7
Indoor multi-base stations system with simultaneous transmission using OFDM adaptive array antenna 采用OFDM自适应阵列天线的室内多基站同步传输系统
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881617
T. Fujii, M. Nakagawa
{"title":"Indoor multi-base stations system with simultaneous transmission using OFDM adaptive array antenna","authors":"T. Fujii, M. Nakagawa","doi":"10.1109/PIMRC.2000.881617","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881617","url":null,"abstract":"We propose to set an OFDM adaptive array on a mobile terminal in order to collect the signals received from multi-base stations efficiently in an indoor wireless system. By doing so, the system will obtain some diversity gain when the received signals contain the same data. Moreover, when they contain different data, the mobile terminal is capable of mitigating the interferer waves and thus obtaining the desired signal. The performance of the proposed system is evaluated by computer simulations and the possibility of constructing a system without the use of frequency assignment or time assignment in wireless networks is discussed.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126285540","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
Differentially detected GMSK signals in the presence of ACI and nonlinearities 差分检测存在ACI和非线性的GMSK信号
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881491
P. Mathiopoulos
{"title":"Differentially detected GMSK signals in the presence of ACI and nonlinearities","authors":"P. Mathiopoulos","doi":"10.1109/PIMRC.2000.881491","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881491","url":null,"abstract":"The effects on the performance of differentially detected Gaussian minimum shift keying (GMSK) signals operated in the presence of adjacent channel interference (ACI), modulator impairments, amplifier nonlinearities and additive white Gaussian noise (AWGN) is investigated. By means of computer simulation, the bit error rate (BER) performance of 1- and 2-bit conventional and decision feedback differentially detected (C-DD and DF-DD) GMSK systems in the presence of static and Rayleigh faded ACI is obtained. It is found that the best performance is achieved by the 2-bit DF-DD receiver and has resulted in BER performance improvements for the static ACI channel and error floor reductions for the Rayleigh faded ACI channel.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126365601","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
Comparison of two DOA tracking implementations for SDMA SDMA中两种DOA跟踪实现的比较
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881448
W. Utschick, M. Treiber, T. Kurpjuhn, J. Nossek
{"title":"Comparison of two DOA tracking implementations for SDMA","authors":"W. Utschick, M. Treiber, T. Kurpjuhn, J. Nossek","doi":"10.1109/PIMRC.2000.881448","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881448","url":null,"abstract":"Utilizing adaptive antenna arrays at the base stations of next generation mobile communication systems has been proposed as a promising approach to meet future requirements, e.g. spatio-temporal filtering techniques benefit from the detailed knowledge of the directional channel parameters. Unfortunately, in parameter estimation the computation of the signal subspace often turns out to be the most time-consuming part. However, the computational complexity of the subspace estimation can be significantly reduced by means of tracking. To this end, we propose a new technique which is merely based on the projector representation of the subspace. The presented results are based on the DSP implementation of two algorithms for tracking the azimuthal and elevation angles of impinging wavefronts in an alternating mobile communications system.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126531894","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
Energy efficiency analysis of link layer backoff schemes on point-to-point Markov fading links 点对点马尔可夫衰落链路上链路层退避方案的能量效率分析
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881459
P. Soni, A. Chockalingam
{"title":"Energy efficiency analysis of link layer backoff schemes on point-to-point Markov fading links","authors":"P. Soni, A. Chockalingam","doi":"10.1109/PIMRC.2000.881459","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881459","url":null,"abstract":"Backoff algorithms are traditionally employed in multiple access networks, like Ethernet, to recover from packet collisions. We propose and carry out the analysis for three types of link layer backoff schemes-linear, binary exponential, geometric-on point-to-point wireless fading links, where packet errors occur non-independently. In such a scenario, the back-off schemes are shown to achieve better energy efficiency without compromising much on the link layer throughput performance.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130218980","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
Comparison between two methods for delayed decision feedback sequence estimation 延迟决策反馈序列估计两种方法的比较
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525) Pub Date : 2000-09-18 DOI: 10.1109/PIMRC.2000.881629
M. Magarini, A. Spalvieri, G. Tartara
{"title":"Comparison between two methods for delayed decision feedback sequence estimation","authors":"M. Magarini, A. Spalvieri, G. Tartara","doi":"10.1109/PIMRC.2000.881629","DOIUrl":"https://doi.org/10.1109/PIMRC.2000.881629","url":null,"abstract":"The paper deals with the design of suboptimal receivers for data transmission over frequency selective channels. The complexity of maximum likelihood sequence estimation (MLSE) turns out be exponential in the channel memory. Hence, when dealing with channels with long memory, suboptimal reception must be considered. Among the suboptimal methods, the delayed decision feedback sequence estimation (DDFSE) plays an important role. This receiver is based on a Viterbi processor where the channel memory is truncated. The memory truncation is compensated by a per-survivor decision feedback equalizer. The DDFSE was originally proposed by Duel-Hallen and Heegard (1989), where the whitened matched filter was considered as a front-end. Our contribution is to extend the principles of MLSE and DDFSE to the case where the mean-square whitened matched filter is adopted as a front-end. Simulation results show that our proposed design of the DDFSE gives substantial benefits when a severe frequency selective channel is considered.","PeriodicalId":301441,"journal":{"name":"11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132333377","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
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