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Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications最新文献

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Coherent DS-CDMA: promising multiple access for wireless multimedia mobile communications 相干DS-CDMA:有望实现无线多媒体移动通信的多址接入
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563799
F. Adachi, M. Sawahashi, T. Dohi, K. Ohno
{"title":"Coherent DS-CDMA: promising multiple access for wireless multimedia mobile communications","authors":"F. Adachi, M. Sawahashi, T. Dohi, K. Ohno","doi":"10.1109/ISSSTA.1996.563799","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563799","url":null,"abstract":"This paper describes a design concept and the features of coherent DS-CDMA access which supports multimedia services and also flexible system deployment. The testbed implemented for a series of field experiments near Tokyo and some measurement results are reported. In the proposed system, two-layer code assignment and transmit power control based on signal-to-interference (SIR) measurements are used. Pilot symbol-assisted coherent RAKE reception in the reverse link is employed to enhance the transmission quality. This paper also reports on the cell search algorithm used to accomplish rapid cell search under asynchronous cell site operation and low power consuming matched filter implementation. Finally, as an evolutionary step in future technology, an application of an interference canceling scheme and an adaptive beamforming scheme are presented in order to further increase the link capacity.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115669145","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: 49
A quantitative relation between the channel quality and the service quality in cellular mobile communication systems 蜂窝移动通信系统中信道质量与服务质量的定量关系
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563180
D. Huo, Mannesmann Eurokom
{"title":"A quantitative relation between the channel quality and the service quality in cellular mobile communication systems","authors":"D. Huo, Mannesmann Eurokom","doi":"10.1109/ISSSTA.1996.563180","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563180","url":null,"abstract":"Radio links in cellular mobile communication systems are fading and interference bounded. The deterioration of the radio channels due to fading and interference increases the actual traffic that a system has to cope with. This has the consequence of a reduced availability and, hence, a degraded quality of service. The paper addresses this problem by introducing virtual arrivals and virtual departures into the queueing model. By this means the quality of a nondeterministic channel, such as those of mobile communications, is taken into account. The result can be used for network design in cellular mobile communications.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127361265","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
Protocol aspects of evolutionary CDMA schemes 演进CDMA方案的协议方面
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563490
J. Mayer, J. Schlee
{"title":"Protocol aspects of evolutionary CDMA schemes","authors":"J. Mayer, J. Schlee","doi":"10.1109/ISSSTA.1996.563490","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563490","url":null,"abstract":"The permanently increasing demand for high rate data services in future mobile radio systems requires an air interface which fulfills these requirements. The well known mobile radio standard GSM has almost reached its limits, because it is mainly designed for voice services and a small number of fixed data services. The future mobile radio system which provides many different services at high data rates and a maximum of flexibility can be realized by enhancing the present GSM system by evolutionary CDMA schemes. The management of the complex multiple access scheme is done by protocols. In this paper, the demands on protocols for future mobile radio systems considering especially CDMA are shown. Furthermore, a minimum set of protocols which is necessary to control a CDMA enhanced GSM system is shown. The modeling of communicating systems with agent nets is demonstrated.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126103825","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
A statistical simulation model for the directional mobile radio channel and its configuration 定向移动无线电信道及其配置的统计仿真模型
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563748
U. Martin, M. Grigat
{"title":"A statistical simulation model for the directional mobile radio channel and its configuration","authors":"U. Martin, M. Grigat","doi":"10.1109/ISSSTA.1996.563748","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563748","url":null,"abstract":"Currently new base station concepts are under investigation that take advantage of the directionality of the mobile radio channel either by utilizing antenna beam diversity or adaptive array reception techniques. Unfortunately, the Gaussian (wide sense) stationary uncorrelated scattering (GWSSUS) simulation concept which is most wide-spread adopted in fading simulators neglects any directional anisotropy of the propagation mechanism. In this paper a directional channel simulation model is introduced which is an extension to GWSSUS. Due to its relatively low structural complexity, this directional Gaussian scattering (DGS) concept is applicable not only to soft- but also to hardware fading simulators. The most important advantage of the DGS simulator is that it can easily be configured to match the properties of real-world propagation scenarios. This is achieved based on the information available from echo estimation, a method which recently was introduced for configuring statistical GWSSUS channel models directly from the results of wide-band channel sounding.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126753186","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: 27
Suboptimal multi-user MLSE with partial interference cancellation by tentative decisions 采用暂定决策消除部分干扰的次优多用户MLSE
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563452
W. Sauer-Greff, A. Pauly
{"title":"Suboptimal multi-user MLSE with partial interference cancellation by tentative decisions","authors":"W. Sauer-Greff, A. Pauly","doi":"10.1109/ISSSTA.1996.563452","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563452","url":null,"abstract":"Addressing the problem of intersymbol and interchannel interference (ICI and ISI), optimal and reduced complexity maximum-likelihood receivers for multi-user additive white gaussian noise matrix channels are considered. In general, a multi-dimensional MLSE, e.g., a Viterbi-algorithm is unfeasible for severe ICI, ISI and a large number of users. Applying a perfect decorrelating (noise whitening) matrix filter, the triangular structure of the resulting channel matrix allows a simplified ICI cancelling detector. More practically, an ICI cancelling structure without the necessity of a decorrelating matrix is presented. It comprises user-individual one-dimensional ISI-MLSEs where ICI is cancelled out by reliable tentative symbols of neighboring detectors. To overcome the problem of non-reliable tentative decisions of the ISI-MLSEs, they are delivered by an ICI sequence estimator with implemented ISI cancellation. Applying filters for minimum phase impulse responses, sequential decoding algorithms like the M-algorithm are suitable for a reduced complexity joint detection receivers.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122735445","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
A new multiuser detector employing frequency-domain excision 一种采用频域切除的新型多用户检测器
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563185
M. Lops, G. Ricci, A. Tulino
{"title":"A new multiuser detector employing frequency-domain excision","authors":"M. Lops, G. Ricci, A. Tulino","doi":"10.1109/ISSSTA.1996.563185","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563185","url":null,"abstract":"We address the problem of multiuser detection in synchronous code-division multiple-access systems in the presence of narrowband external interference. The proposed approach relies on processing the observables in the frequency domain, so as to exploit the narrowband nature of the interferers. The resulting detector represents a generalization of the decorrelating detector to which, in fact, it reduces for the special case that no external interference is considered at the design stage. The performance assessment shows that the newly proposed receiver largely outperforms the decorrelating detector in the presence of narrowband interference, while suffering a negligible loss as no interferer is active.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121891152","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
Evaluation of a wideband CDMA testbed for future wireless systems 面向未来无线系统的宽带CDMA试验台的评估
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563781
M. Ewerbring, W. Granzow, P. Teder
{"title":"Evaluation of a wideband CDMA testbed for future wireless systems","authors":"M. Ewerbring, W. Granzow, P. Teder","doi":"10.1109/ISSSTA.1996.563781","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563781","url":null,"abstract":"The requirements of future mobile radio systems go far beyond what is provided by presently deployed or currently introduced systems, especially with respect to services and service bit rates. We introduce a wideband testbed system developed by Ericsson. The air interface concept and the proposed generic transmission scheme on the physical layer permit an easy adaptation to particular service requirements and make it easy to introduce new services to the system. The flexibility of the air interface concept is maintained by the hardware architecture of the Ericsson wideband testbed. Fixed and variable-rate speech and data services are demonstrated. Extensive laboratory and field trials are being carried out to gain experience with the operation of wideband CDMA systems, to evaluate its performance, and to assess its suitability for new services. This paper provides an overview on the system concept and the testbed architecture. Performance results from first laboratory trials are reported.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122062338","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
Trade-off between channel coding and spreading in multi-carrier CDMA systems 多载波CDMA系统中信道编码与扩频的权衡
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563617
S. Kaiser
{"title":"Trade-off between channel coding and spreading in multi-carrier CDMA systems","authors":"S. Kaiser","doi":"10.1109/ISSSTA.1996.563617","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563617","url":null,"abstract":"The efficiency of multi-carrier code division multiple access (MC-CDMA) systems for mobile radio communications depends on the processing gain due to bandwidth expansion and on the gain offered by channel coding. This paper shows how to evaluate the optimal ratio between spreading code length and channel coding rate for MC-CDMA systems in the downlink. The investigations are carried out for conventional MC-CDMA detection with minimum mean square error (MMSE) equalization and joint detection with maximum likelihood sequence estimation (MLSE). The results obtained with MC-CDMA systems are compared with those achieved by multi-carrier frequency division multiple access (MC-FDMA) and by multi-carrier time division multiple access (MC-TDMA) systems. Furthermore, for channel coding using convolutional codes, simple approximations of the log-likelihood ratio for the Viterbi decoding algorithm are presented in the case of MC-CDMA.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117036949","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: 56
A narrowband multi-ary FSK transmission principle using sampling function waveform modulation 采用采样函数波形调制的窄带多频移频传输原理
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563254
N. Kuroyanagi, N. Suehiro, K. Ohtake, M. Tomita, L. Guo
{"title":"A narrowband multi-ary FSK transmission principle using sampling function waveform modulation","authors":"N. Kuroyanagi, N. Suehiro, K. Ohtake, M. Tomita, L. Guo","doi":"10.1109/ISSSTA.1996.563254","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563254","url":null,"abstract":"Conventional FSK uses shift frequencies of integer times the frame rate. If shift frequencies using non-integers (NIFSK) could be used, the frequency utilization efficiency would improve due to the capability of multi-ary transmission. However, since a framed sequence consisting of NIFSK includes abrupt transients, the waveform suffers from considerable distortion when it is transmitted via a bandlimited path. To solve this problem, we propose sampling function waveform modulation system (SAFWM). SAFWM uses a modified sampling function waveform that is immune to intersymbol interference generated in the process of conveying each sampled value of an FSK signal. The transmission bandwidth is only slightly larger than that of zero to the maximum shift frequency. At the receiver, the sampled values are restored by correlation detection with the same waveforms, and are transformed into the original FSK. To accurately restore a waveform of transmitted NIFSK signals, frame extension is introduced. Distortionless transmission performed with this method is confirmed by computer simulation. This principle can be applied not only for FSK/PSK but also for FSK-SS (spread spectrum) and FH-SS, resulting in improving their frequency utilization efficiencies.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129789764","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
Frequency hopping spectral capacity enhancement of cellular networks 蜂窝网络跳频频谱容量增强
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications Pub Date : 1996-09-22 DOI: 10.1109/ISSSTA.1996.563509
K. Ivanov, N. Metzner, G. Spring, H. Winkler, P. Jung
{"title":"Frequency hopping spectral capacity enhancement of cellular networks","authors":"K. Ivanov, N. Metzner, G. Spring, H. Winkler, P. Jung","doi":"10.1109/ISSSTA.1996.563509","DOIUrl":"https://doi.org/10.1109/ISSSTA.1996.563509","url":null,"abstract":"In the highly competitive mobile radio market the resource system spectrum is often shared between at least two system operators while the capacity demands and quality requirements are dramatically increasing. Wideband random frequency hopping (FH) in digital F/TDMA systems like GSM and its derivatives is a method of expanding the bandwidth used by a traffic channel, thereby creating frequency and interference diversity effects. In this paper the diversity effects of random FH are analysed by means of combined link and system level simulations of the GSM full rate speech channel embedded in different network simulation environments in different network configurations. The results indicate that even without power control the use of random FH with discontinuous transmission (DTX) provides both spectral capacity enhancement and improved quality for slow-moving mobiles in particular. We show that with a total of 24 frequencies available for traffic a fractionally loaded 1/3 reuse scheme yields a spectral capacity increase of 84% compared with a non-hopping 4/12 reuse scheme at the same speech quality level.","PeriodicalId":178152,"journal":{"name":"Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129792382","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: 21
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