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

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Generative Markov models for discrete channel modelling 离散信道建模的生成马尔可夫模型
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.624353
N. Nefedov
{"title":"Generative Markov models for discrete channel modelling","authors":"N. Nefedov","doi":"10.1109/PIMRC.1997.624353","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624353","url":null,"abstract":"To speedup the simulations aimed at different error control and interleaving schemes evaluation there is a need for generative models of the radio layer communication link. A method of modelling discrete channels with hard and soft decision outputs is suggested. This method is based on nested hidden Markov model (HMM) and implemented as COSSAP library modules. The verification made by simulations of GSM speech traffic confirmed the validity of suggested approach.","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":"131199106","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
I-QTCM QPSK synchronous DS/CDMA over frequency-selective multipath Rayleigh fading channels with selection diversity 基于频率选择多径瑞利衰落信道的I-QTCM QPSK同步DS/CDMA
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.624395
I. Furió, G. Femenias
{"title":"I-QTCM QPSK synchronous DS/CDMA over frequency-selective multipath Rayleigh fading channels with selection diversity","authors":"I. Furió, G. Femenias","doi":"10.1109/PIMRC.1997.624395","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624395","url":null,"abstract":"This paper considers the application of I-Q trellis coded modulation (TCM) techniques to synchronous direct sequence code division multiple access (S-DS/CDMA) communication over frequency-selective fading mobile radio channels. The effect of the optimum adaptive coherent RAKE receiver structure with selection of the largest outputs is studied and an exact analytical expression for the pairwise error probability is obtained. This expression is used to evaluate the average BER upper bound through the transfer function bounding technique. The influence over the average BER of various system parameters like the number of active users, the number of selected outputs or sequence length are considered.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"34 4 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":"132602011","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
A blind equalization with the variable decision region 具有可变决策域的盲均衡
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.630920
S. Kwon, Tae-hyun Moon, Jae-Hyuck Lee, C. Kang
{"title":"A blind equalization with the variable decision region","authors":"S. Kwon, Tae-hyun Moon, Jae-Hyuck Lee, C. Kang","doi":"10.1109/PIMRC.1997.630920","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.630920","url":null,"abstract":"A blind equalization algorithm may be switched to a decision-directed (DD) scheme in order to speed up the convergence rate. In this paper, we propose a new blind equalization scheme that automatically switches to the DD mode. The proposed scheme operates in two modes: a blind equalization mode and a DD mode. The mode is determined by the region in which the equalizer output lies, and the region varies as function of the estimated value of the error variance. Only the equalized signal that falls in the region of confidence is used to calculate the variance. From simulation results, it is shown that this scheme can achieve faster convergence and small MSE.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"40 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":"133417148","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
T-algorithm detection of partial response continuous phase modulated signals over multipath channels 多径信道上部分响应连续相位调制信号的t算法检测
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.627063
E. Ince, Y. Guo, S. Barton
{"title":"T-algorithm detection of partial response continuous phase modulated signals over multipath channels","authors":"E. Ince, Y. Guo, S. Barton","doi":"10.1109/PIMRC.1997.627063","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627063","url":null,"abstract":"This paper presents a new approach to reduced complexity detection of partial response continuous phase modulated signals over channels with severe intersymbol interference (ISI). The detector combines the overall channel response for the CPM modulator with that of a multipath channel to calculate the branch metrics of a breadth-first sequential detection algorithm known as the T-algorithm. To our knowledge the reported work is the first attempt to make use of such a technique for equalisation of quaternary partial response CPM signals transmitted over multipath channels. Simulation of the performance of the receiver in multipath channels is reported.","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":"134167369","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
Performance evaluation of a ray tracing based microcellular coverage prediction tool 基于光线追踪的微蜂窝覆盖预测工具性能评价
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.631055
J. Wagen, E. Lachat, Jingming Li
{"title":"Performance evaluation of a ray tracing based microcellular coverage prediction tool","authors":"J. Wagen, E. Lachat, Jingming Li","doi":"10.1109/PIMRC.1997.631055","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631055","url":null,"abstract":"Based on measurements in five urban environments in three different cities, the accuracy of a ray tracing based model is characterized. First, the conventional characterization using the mean and standard deviation of the prediction error is used. Then, a figure of merit defined as the percentage of correct prediction with respect to a coverage threshold is computed. Finally, an example is given to illustrate how prediction results could be displayed to provide some insights into the accuracy of the model. For comparison purpose, results from power law curve fits are also analyzed. It is concluded that the standard deviation is a fair characterization of the accuracy of a model as long as its value is small (<-7 dB). For larger value, the figure of merit can be more useful. However, further work is needed to find reliable characteristics which could provide almost as much information as the visual inspection of the prediction results overlaid on the measurements.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"19 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":"130344102","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
On the performance improvement of packet radio systems with one single interferer due to random transmission power strategy 基于随机传输功率策略的单干扰分组无线电系统性能改进研究
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.630967
R. Verdone
{"title":"On the performance improvement of packet radio systems with one single interferer due to random transmission power strategy","authors":"R. Verdone","doi":"10.1109/PIMRC.1997.630967","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.630967","url":null,"abstract":"Packet radio systems with random multiple access where the geometry of the scenario determines the presence of a maximum of two simultaneous transmitters, are analysed. Packet capture probability is evaluated in order to investigate the possible improvements of the random transmission power strategy first proposed by Lee (1987). Propagation is characterised by a path-loss exponent. The capture effect is taken into account by means of a threshold model. Averaging over interfering distance is accomplished. After an analytical development, the packet capture probability is found to be determinable by means of closed-form expressions. It is shown that the random transmission power strategy improves system performance in certain conditions. Some examples of application of this technique are given.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"35 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":"116672505","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
Propagation measurements at 5.2 GHz in commercial and domestic environments 商业和家庭环境中5.2 GHz的传播测量
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.631059
P. Hafezi, D. Wedge, M. Beach, M. Lawton
{"title":"Propagation measurements at 5.2 GHz in commercial and domestic environments","authors":"P. Hafezi, D. Wedge, M. Beach, M. Lawton","doi":"10.1109/PIMRC.1997.631059","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631059","url":null,"abstract":"This paper presents the results of an investigation into the wideband propagation characteristics of four different indoor operational environments within the 5.2 GHz band using a swept time-delay cross-correlator (STDCC) channel sounder. For each environment the cumulative distribution of delay spread for both omni-directional and a 20 dB horn antenna are presented. It is shown that a suitably aligned narrowbeam antenna makes possible to achieve delay spread reduction through spatial filtering. The effects of moving people and different room transmission situations are also presented.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"28 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":"117304915","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: 25
Diversity techniques for blind channel equalization in mobile communications 移动通信中盲信道均衡分集技术
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.627052
M. Lamarca, G. Vázquez
{"title":"Diversity techniques for blind channel equalization in mobile communications","authors":"M. Lamarca, G. Vázquez","doi":"10.1109/PIMRC.1997.627052","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627052","url":null,"abstract":"A blind algorithm for channel distortion compensation is presented which can be employed in spatial or temporal diversity receivers. The proposed technique can be used in frequency selective and frequency flat fading mobile channels, using burst transmission schemes in the first case and OFDM modulation in the second one. The algorithm is base on a deterministic criteria and is suited for estimation when short sets of data are available.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"12 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":"124934547","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: 10
Performance evaluation of random power assignment scheme on cellular mobile communications with finite population 有限人口蜂窝移动通信随机功率分配方案的性能评价
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.626994
J. Wen, Kuo-Gen Hsu, Ethan Chen, J. Wen
{"title":"Performance evaluation of random power assignment scheme on cellular mobile communications with finite population","authors":"J. Wen, Kuo-Gen Hsu, Ethan Chen, J. Wen","doi":"10.1109/PIMRC.1997.626994","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.626994","url":null,"abstract":"Power assignment schemes are man-made method used to enhance the capture effect of contention-based multiple access systems while Rayleigh fading, near/far effect and shadow fading are natural factors that cause the capture effect in radio communications. The combined impact of natural and man-made capture effects on the performance of a cellular system with finite population is studied. A Markov model is used to carry out an analysis of the system throughput and delay. Some numerical calculations are used to demonstrate the degree of performance improvement.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"62 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":"122986276","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 100 Mbit/s tracked optical wireless telepoint 一个100mbit /s的跟踪光无线远程点
Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97 Pub Date : 1997-09-01 DOI: 10.1109/PIMRC.1997.627029
D. Wisely, I. Neild
{"title":"A 100 Mbit/s tracked optical wireless telepoint","authors":"D. Wisely, I. Neild","doi":"10.1109/PIMRC.1997.627029","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627029","url":null,"abstract":"This paper describes the design, construction and testing of a demonstration 100 Mbit/s tracked optical wireless telepoint system. The prototype uses switched linear laser and detector arrays, each imaged onto a small part of the total area, to allow wide coverage at high data rates. A separate tracking system monitors the relative mobility of nodes and switches the transceiver elements to maintain communication. A combination of operation at 1500 nm and a large number of switched laser elements (16) result in Class 1, eye safe, operation.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"27 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":"122006845","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: 26
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