Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.624353
N. Nefedov
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.
{"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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.624395
I. Furió, G. Femenias
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.
{"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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.630920
S. Kwon, Tae-hyun Moon, Jae-Hyuck Lee, C. Kang
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.
{"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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.627063
E. Ince, Y. Guo, S. Barton
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.
{"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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.631055
J. Wagen, E. Lachat, Jingming Li
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.
{"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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.631074
J. Harmer
The ACTS On The Move project is investigating mobile multimedia applications and services for the Universal Mobile Telecommunications System (UMTS). A Mobile Application Support Environment (MASE) is being designed and implemented. This middleware enables personalised access to multimedia applications which will be available to users irrespective of the mobile hardware, user location and wireless network characteristics. A Mobile Application Programming Interface (Mobile-API) is being developed which provides access to MASE facilities. The Mobile-API is being used to develop new, mobile aware, multimedia applications. MASE functionality is being demonstrated through the implementation of a mobile aware multimedia business information system which forms the basis of a series of field trials. The project began in September 1995 and lasts for three years. This paper introduces the background and rationale behind the On The Move project. An overview of MASE functionality and the Mobile-API is given. The mobile aware business information system "Infomotion" and its evolution through the field trial programme is described.
移动中的ACTS项目正在为通用移动通信系统(UMTS)调查移动多媒体应用和服务。一个移动应用支持环境(MASE)正在被设计和实现。这种中间件使用户能够访问个性化的多媒体应用程序，而不受移动硬件、用户位置和无线网络特性的影响。一个移动应用程序编程接口(Mobile- api)正在开发中，它提供了对MASE设施的访问。mobile - api正被用于开发新的、移动感知的多媒体应用程序。MASE的功能正在通过移动感知多媒体业务信息系统的实施来展示，该系统构成了一系列实地试验的基础。该项目于1995年9月开始，为期三年。本文介绍了On the Move项目的背景和基本原理。给出了MASE功能和Mobile-API的概述。描述了移动感知商业信息系统“information”及其通过现场试验方案的演变。
{"title":"Mobile aware multimedia applications for UMTS: the ACTS On The Move project","authors":"J. Harmer","doi":"10.1109/PIMRC.1997.631074","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631074","url":null,"abstract":"The ACTS On The Move project is investigating mobile multimedia applications and services for the Universal Mobile Telecommunications System (UMTS). A Mobile Application Support Environment (MASE) is being designed and implemented. This middleware enables personalised access to multimedia applications which will be available to users irrespective of the mobile hardware, user location and wireless network characteristics. A Mobile Application Programming Interface (Mobile-API) is being developed which provides access to MASE facilities. The Mobile-API is being used to develop new, mobile aware, multimedia applications. MASE functionality is being demonstrated through the implementation of a mobile aware multimedia business information system which forms the basis of a series of field trials. The project began in September 1995 and lasts for three years. This paper introduces the background and rationale behind the On The Move project. An overview of MASE functionality and the Mobile-API is given. The mobile aware business information system \"Infomotion\" and its evolution through the field trial programme is described.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"147 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":"134473898","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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.627025
R. Petrovic, A. Molisch
We analyze how multipath effects namely errors due to channel-induced intersymbol interference, can be reduced by frequency-discriminator detection for FSK. We first introduce a new mathematical technique that can be considered as generalization of FM noise-click theory, and thus allows insights into the error mechanisms. Building on those insights, we propose and verify that a nonlinear frequency discriminator can achieve zero error floor for pure binary FSK and drastically reduced the error floor for filtered FSK by clipping off the ISI-induced FM clicks. The stronger the filtering (before or after the frequency discriminator), the more the beneficial effect of the nonlinearity is reduced. Finally, we show that increasing the modulation index decreases the error floor, especially in the presence of frequency shifts. Our results suggest the design of improved receivers that are less sensitive to ISI.
{"title":"Reduction of multipath effects for FSK with frequency-discriminator detection","authors":"R. Petrovic, A. Molisch","doi":"10.1109/PIMRC.1997.627025","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627025","url":null,"abstract":"We analyze how multipath effects namely errors due to channel-induced intersymbol interference, can be reduced by frequency-discriminator detection for FSK. We first introduce a new mathematical technique that can be considered as generalization of FM noise-click theory, and thus allows insights into the error mechanisms. Building on those insights, we propose and verify that a nonlinear frequency discriminator can achieve zero error floor for pure binary FSK and drastically reduced the error floor for filtered FSK by clipping off the ISI-induced FM clicks. The stronger the filtering (before or after the frequency discriminator), the more the beneficial effect of the nonlinearity is reduced. Finally, we show that increasing the modulation index decreases the error floor, especially in the presence of frequency shifts. Our results suggest the design of improved receivers that are less sensitive to ISI.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"33 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":"134388637","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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.631101
I. Yoshii, R. Kohno
Pieter van Rooyen and Kohno proposed a combination receiver of adaptive arrays and MRC diversity, named a double spatial and temporal filter (DSTF) receiver. Each of the diversity branches consist of an array antenna. Each of the branches are separated spatially and independent. This assumption differs from the plane waves model. This paper discusses a method of combining an array antenna and a diversity antenna in plane waves model.
Pieter van Rooyen和Kohno提出了一种自适应阵列和MRC分集的组合接收机，称为双时空滤波器(double spatial and temporal filter, DSTF)接收机。每个分集分支由一个阵列天线组成。每个分支在空间上是分开的，独立的。这个假设与平面波模型不同。本文讨论了平面波模型中阵列天线与分集天线相结合的方法。
{"title":"Adaptive directional receiver with different antenna spacing for CDMA","authors":"I. Yoshii, R. Kohno","doi":"10.1109/PIMRC.1997.631101","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631101","url":null,"abstract":"Pieter van Rooyen and Kohno proposed a combination receiver of adaptive arrays and MRC diversity, named a double spatial and temporal filter (DSTF) receiver. Each of the diversity branches consist of an array antenna. Each of the branches are separated spatially and independent. This assumption differs from the plane waves model. This paper discusses a method of combining an array antenna and a diversity antenna in plane waves model.","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":"134404783","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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.624401
M. Hashimoto, S. Sampei, N. Morinaga
This paper proposes a direct sequence/code division multiple access (DS/CDMA) cellular system using channel activation and soft power control techniques to increase both the forward and reverse link capacities. To equivalently control the received signal to interference and noise power ratio (CINR) to be constant, the proposed system employs a channel activation technique in which higher channel coding gain and small processing gain are employed with a shorter burst length during higher CINR period, and a lower channel coding gain and larger processing gain are employed with longer burst during lower CINR. Moreover, the proposed system employs a soft power control technique to enhance the advantages of the channel activation technique. Computer simulation confirms that the proposed system can achieve a higher system capacity with a smaller soft hand-off margin and a smaller average transmitter power.
{"title":"Forward and reverse link capacity enhancement of DS/CDMA cellular system using channel activation and soft power control techniques","authors":"M. Hashimoto, S. Sampei, N. Morinaga","doi":"10.1109/PIMRC.1997.624401","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624401","url":null,"abstract":"This paper proposes a direct sequence/code division multiple access (DS/CDMA) cellular system using channel activation and soft power control techniques to increase both the forward and reverse link capacities. To equivalently control the received signal to interference and noise power ratio (CINR) to be constant, the proposed system employs a channel activation technique in which higher channel coding gain and small processing gain are employed with a shorter burst length during higher CINR period, and a lower channel coding gain and larger processing gain are employed with longer burst during lower CINR. Moreover, the proposed system employs a soft power control technique to enhance the advantages of the channel activation technique. Computer simulation confirms that the proposed system can achieve a higher system capacity with a smaller soft hand-off margin and a smaller average transmitter power.","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":"131701409","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}
Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.627029
D. Wisely, I. Neild
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.
{"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}
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