Pub Date : 1998-10-05DOI: 10.1109/ICUPC.1998.733030
T. Ikeda, S. Sampei, N. Morinaga
This paper proposes a multimedia adaptive modulation with dynamic channel assignment (M-AMDCA) to realize wireless multimedia communication systems. This system controls modulation parameters and the assigned slots of TDMA frame according not only to the propagation path conditions, but also to the feature of transmitted medium, say realtime traffic or non-realtime traffic, quality of service (QoS) and required bit rate. For this purpose, the proposed system measures the received carrier-to-noise plus interference power ratio (C/(N+I)) of each TDMA slot, and selects the optimum modulation parameters and the assigned slots by using the suitable channel assignment algorithm for each medium. Computer simulation confirms that the proposed M-AMDCA system can achieve very high performances for each medium under voice, video and data co-existence conditions.
{"title":"The performance of adaptive modulation with dynamic channel assignment in multimedia traffic","authors":"T. Ikeda, S. Sampei, N. Morinaga","doi":"10.1109/ICUPC.1998.733030","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733030","url":null,"abstract":"This paper proposes a multimedia adaptive modulation with dynamic channel assignment (M-AMDCA) to realize wireless multimedia communication systems. This system controls modulation parameters and the assigned slots of TDMA frame according not only to the propagation path conditions, but also to the feature of transmitted medium, say realtime traffic or non-realtime traffic, quality of service (QoS) and required bit rate. For this purpose, the proposed system measures the received carrier-to-noise plus interference power ratio (C/(N+I)) of each TDMA slot, and selects the optimum modulation parameters and the assigned slots by using the suitable channel assignment algorithm for each medium. Computer simulation confirms that the proposed M-AMDCA system can achieve very high performances for each medium under voice, video and data co-existence conditions.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127774428","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733032
I. Bazar, Y. Onozato, Z. Jie
Two well known methods to increase the capacity in a cellular network, TDMA and CDMA, are evaluated on a two-tier cellular structure. In order to use the network resources preciously, we consider sharing the available spectrum effectively between these tiers. We investigate two models, called System I and System II. In System I, CDMA access methods are employed in both layers. In System II, TDMA is deployed for users in the microcell tier and CDMA for macrocell users. The results of numerical calculations are presented. The impact of interference caused by different distances among the related cells is assessed. It is shown that the capacity of the above systems is decreased as the distance of related cells becomes closer. The characteristics showing that System I is better than System II in terms of user capacity, can be recognized for various values of cell distances.
{"title":"Effects of cell distance on capacity of two-tier cellular networks","authors":"I. Bazar, Y. Onozato, Z. Jie","doi":"10.1109/ICUPC.1998.733032","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733032","url":null,"abstract":"Two well known methods to increase the capacity in a cellular network, TDMA and CDMA, are evaluated on a two-tier cellular structure. In order to use the network resources preciously, we consider sharing the available spectrum effectively between these tiers. We investigate two models, called System I and System II. In System I, CDMA access methods are employed in both layers. In System II, TDMA is deployed for users in the microcell tier and CDMA for macrocell users. The results of numerical calculations are presented. The impact of interference caused by different distances among the related cells is assessed. It is shown that the capacity of the above systems is decreased as the distance of related cells becomes closer. The characteristics showing that System I is better than System II in terms of user capacity, can be recognized for various values of cell distances.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127968517","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.732797
K. Kimura, J. Horikoshi
A prediction of the 54 GHz-band multipath propagation characteristics in typical urban and rural environments are clarified. The analysis depends on actual measured results. To analyze the propagation in an outdoor environment, the three dimensional model based on geometrical optics and the uniform geometrical theory of diffraction is employed. Prediction by the three dimensional ray tracing method needs a detailed map, which records locations and shapes of obstacles surrounding a transmitter and a receiver. The results are demonstrated and comparisons are made between the simulated results and the experimental data. Good agreement between the measured results and prediction is obtained.
{"title":"Prediction of wideband propagation characteristics of the millimeter-wave in the mobile radio environment","authors":"K. Kimura, J. Horikoshi","doi":"10.1109/ICUPC.1998.732797","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732797","url":null,"abstract":"A prediction of the 54 GHz-band multipath propagation characteristics in typical urban and rural environments are clarified. The analysis depends on actual measured results. To analyze the propagation in an outdoor environment, the three dimensional model based on geometrical optics and the uniform geometrical theory of diffraction is employed. Prediction by the three dimensional ray tracing method needs a detailed map, which records locations and shapes of obstacles surrounding a transmitter and a receiver. The results are demonstrated and comparisons are made between the simulated results and the experimental data. Good agreement between the measured results and prediction is obtained.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127604139","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733623
N. Correal, B. Woerner
Advanced receiver structures that incorporate multiuser detection principles have the potential of substantially increasing the performance of DS-CDMA systems and alleviating the near-far problem, by compensating for multiple access interference. In multipath channels, performance can be further improved by incorporating diversity techniques that mitigate the effects of fading. This paper studies via a simulation approach the benefits of combining dual antenna diversity with DS-CDMA multiuser detection. Polarization as well as spatial diversity are examined as potential candidates for diversity reception at the base station.
{"title":"Evaluation of dual spatial and polarization diversity reception for DS-CDMA multiuser detection","authors":"N. Correal, B. Woerner","doi":"10.1109/ICUPC.1998.733623","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733623","url":null,"abstract":"Advanced receiver structures that incorporate multiuser detection principles have the potential of substantially increasing the performance of DS-CDMA systems and alleviating the near-far problem, by compensating for multiple access interference. In multipath channels, performance can be further improved by incorporating diversity techniques that mitigate the effects of fading. This paper studies via a simulation approach the benefits of combining dual antenna diversity with DS-CDMA multiuser detection. Polarization as well as spatial diversity are examined as potential candidates for diversity reception at the base station.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127348974","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.732846
D. Calin
A probabilistic model for evaluating the blocking and forced termination probabilities for voice and data calls in wireless communication networks is presented. Ongoing traffic can access a waiting queue and reserved guard channels for their own use to reduce the forced termination probability. Priority is given to voice handoffs over data handoffs. The objective of this traffic policy is to achieve higher quality of service (QoS) for voice, while maintaining low deterioration for data calls and keeping good utilization of the mobile network. The model can be applied when the mean service times for voice and data are different. The analysis is validated by results obtained from a comprehensive simulation.
{"title":"A probabilistic model for handling voice and data traffic in wireless networks","authors":"D. Calin","doi":"10.1109/ICUPC.1998.732846","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732846","url":null,"abstract":"A probabilistic model for evaluating the blocking and forced termination probabilities for voice and data calls in wireless communication networks is presented. Ongoing traffic can access a waiting queue and reserved guard channels for their own use to reduce the forced termination probability. Priority is given to voice handoffs over data handoffs. The objective of this traffic policy is to achieve higher quality of service (QoS) for voice, while maintaining low deterioration for data calls and keeping good utilization of the mobile network. The model can be applied when the mean service times for voice and data are different. The analysis is validated by results obtained from a comprehensive simulation.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133744634","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733661
W. Fuhrmann, B. Jabbari
The potential to provide multiple logical packet links to distant base stations exists in a reasonable part of the coverage area either by overlapping or hierarchical cell structure. This potential can be tapped in a packet mode to increase system throughput, improve performance and simplify the mobility and handoff procedures. Our discussion includes four key issues: (i) multiple link packet protocol operation, (ii) mobility management, (iii) packet routing and transfer, and (iv) performance. We present a preliminary analysis of the system performance using a Markov modulated Poisson process for the overflow and quantify the performance improvement through a numerical example.
{"title":"Multiple link packet access for wireless cellular networks","authors":"W. Fuhrmann, B. Jabbari","doi":"10.1109/ICUPC.1998.733661","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733661","url":null,"abstract":"The potential to provide multiple logical packet links to distant base stations exists in a reasonable part of the coverage area either by overlapping or hierarchical cell structure. This potential can be tapped in a packet mode to increase system throughput, improve performance and simplify the mobility and handoff procedures. Our discussion includes four key issues: (i) multiple link packet protocol operation, (ii) mobility management, (iii) packet routing and transfer, and (iv) performance. We present a preliminary analysis of the system performance using a Markov modulated Poisson process for the overflow and quantify the performance improvement through a numerical example.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130421527","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733635
S. Hadjiefthymiades, A. Kaloxylos, L. Merakos
The introduction of ATM in wireless CPN environments (WATM) necessitates the design of mobility signalling protocols, since the existing versions of B-ISDN signalling do not support terminal mobility. These protocols can be deployed either as extensions to the standard signalling capabilities, or as individual solutions that have little or no impact on existing infrastructures (switches, signalling software, etc.). In this paper, we present a WATM architecture that adopts the latter approach. We briefly present several problems that emerge during the integration of wireless networking and B-ISDN ATM technologies. We discuss the design of a mobility management & control protocol (MMC). Finally, we show how registration and forward handover are structured in light of the MMC protocol.
{"title":"Mobility management in the wireless ATM network demonstrator","authors":"S. Hadjiefthymiades, A. Kaloxylos, L. Merakos","doi":"10.1109/ICUPC.1998.733635","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733635","url":null,"abstract":"The introduction of ATM in wireless CPN environments (WATM) necessitates the design of mobility signalling protocols, since the existing versions of B-ISDN signalling do not support terminal mobility. These protocols can be deployed either as extensions to the standard signalling capabilities, or as individual solutions that have little or no impact on existing infrastructures (switches, signalling software, etc.). In this paper, we present a WATM architecture that adopts the latter approach. We briefly present several problems that emerge during the integration of wireless networking and B-ISDN ATM technologies. We discuss the design of a mobility management & control protocol (MMC). Finally, we show how registration and forward handover are structured in light of the MMC protocol.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130457748","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733035
S. Sekizawa
As one of the technologies used to overcome multipath fading in land mobile communications, adaptive array antennas and adaptive equalizers have been investigated. To put adaptive array antennas to practical use, the multipath signal propagation characteristics, such as the time delay and arrival direction, must be clarified. This can be accomplished via the antenna design and by developing an adaptive algorithm. The author has already proposed methods for measuring complex delay profiles with a virtual planar array. This involved scanning a linear array antenna and estimating the time delays and arrival directions of multipath signals by a two-dimensional discrete Fourier transform. This time, the author applied MUSIC algorithm to the virtual planar array to precisely estimate the arrival directions of multipath signals. In this paper, the performance and features of the MUSIC algorithm in estimating the arrival directions of multipath signals via computer simulation are clarified.
{"title":"Estimation of arrival directions using MUSIC algorithm with a planar array","authors":"S. Sekizawa","doi":"10.1109/ICUPC.1998.733035","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733035","url":null,"abstract":"As one of the technologies used to overcome multipath fading in land mobile communications, adaptive array antennas and adaptive equalizers have been investigated. To put adaptive array antennas to practical use, the multipath signal propagation characteristics, such as the time delay and arrival direction, must be clarified. This can be accomplished via the antenna design and by developing an adaptive algorithm. The author has already proposed methods for measuring complex delay profiles with a virtual planar array. This involved scanning a linear array antenna and estimating the time delays and arrival directions of multipath signals by a two-dimensional discrete Fourier transform. This time, the author applied MUSIC algorithm to the virtual planar array to precisely estimate the arrival directions of multipath signals. In this paper, the performance and features of the MUSIC algorithm in estimating the arrival directions of multipath signals via computer simulation are clarified.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130688538","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733046
F. Nuno, Y. Matsumoto
This paper explores virtual destination (VD)/virtual source (VS)-based available bit rate (ABR) flow control performance, targeting wireless asynchronous transfer mode (WATM) application that can incur long link-delays because of employing radio-medium sharing and/or radio-specific data link control schemes. As this paper reveals, the conventional VD/VS scheme has difficulty in sustaining satisfactory ABR performance, when it is applied to long-delay-causing WATM; it suffers from significant increase in the necessary buffer capacity. To ensure the ABR performance in WATM, this paper proposes a new VD/VS coupling scheme using a feed-forward congestion indication. The proposed scheme controls the allowed cell rate of a source end system in a feed-forward manner by predicting the queue length at the time the WATM-associated-round-trip ahead. Simulation results show that the proposed scheme exhibits excellent ABR performance with a long delay of the divided loop on the radio link side. It is also verified that the proposed scheme is rather robust against uncertainty and/or time-variation regarding the predetermined radio link delay.
{"title":"VD/VS coupling scheme using feed-forward congestion indication for ABR services in wireless ATM","authors":"F. Nuno, Y. Matsumoto","doi":"10.1109/ICUPC.1998.733046","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733046","url":null,"abstract":"This paper explores virtual destination (VD)/virtual source (VS)-based available bit rate (ABR) flow control performance, targeting wireless asynchronous transfer mode (WATM) application that can incur long link-delays because of employing radio-medium sharing and/or radio-specific data link control schemes. As this paper reveals, the conventional VD/VS scheme has difficulty in sustaining satisfactory ABR performance, when it is applied to long-delay-causing WATM; it suffers from significant increase in the necessary buffer capacity. To ensure the ABR performance in WATM, this paper proposes a new VD/VS coupling scheme using a feed-forward congestion indication. The proposed scheme controls the allowed cell rate of a source end system in a feed-forward manner by predicting the queue length at the time the WATM-associated-round-trip ahead. Simulation results show that the proposed scheme exhibits excellent ABR performance with a long delay of the divided loop on the radio link side. It is also verified that the proposed scheme is rather robust against uncertainty and/or time-variation regarding the predetermined radio link delay.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134325392","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733029
P. Forster, T. Asté, L. Féty
There has been a great interest recently in multisensors receivers for reducing co-channel interference (CCI) in mobile radio communication systems like GSM. This paper first generalises the efficient multichannel maximum likelihood sequence estimator (MLSE) receiver introduced for stationary circular Gaussian jammers to the more realistic model for GSM of cyclostationary non-circular jammers (modelling CCI) along with additive stationary circular Gaussian noise. Ideal adaptive structures for estimating the filters involved in the MLSE are then compared. Next, a suboptimal implementation of the resulting receiver is proposed: it consists of a spatio-temporal filter for CCI rejection followed by a Viterbi equalizer for ISI processing. Simulations are performed in the GSM context.
{"title":"Multisensors receivers using a filtered reference: application to GSM","authors":"P. Forster, T. Asté, L. Féty","doi":"10.1109/ICUPC.1998.733029","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733029","url":null,"abstract":"There has been a great interest recently in multisensors receivers for reducing co-channel interference (CCI) in mobile radio communication systems like GSM. This paper first generalises the efficient multichannel maximum likelihood sequence estimator (MLSE) receiver introduced for stationary circular Gaussian jammers to the more realistic model for GSM of cyclostationary non-circular jammers (modelling CCI) along with additive stationary circular Gaussian noise. Ideal adaptive structures for estimating the filters involved in the MLSE are then compared. Next, a suboptimal implementation of the resulting receiver is proposed: it consists of a spatio-temporal filter for CCI rejection followed by a Viterbi equalizer for ISI processing. Simulations are performed in the GSM context.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131770030","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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