Pub Date : 1998-10-05DOI: 10.1109/ICUPC.1998.733686
M. C. Valenti, B. Woerner
A method for combining multiuser detection with base station diversity is presented for the uplink of a multiple access network composed of K transmitters and M receivers. At each base station, a K user soft-output multiuser receiver is implemented using the log maximum a posteriori (log-MAP) algorithm. The log-likelihood ratio outputs from the M base stations are combined before a final hard decision is made. This strategy has the ability to simultaneously mitigate the detrimental effects of both multiuser interference and fading, and has the potential to extend cell range and reduce the frequency reuse distance. Simulation results are shown for a time division multiple access (TDMA) network with 3 users and 3 base stations.
{"title":"Multiuser detection with base station diversity","authors":"M. C. Valenti, B. Woerner","doi":"10.1109/ICUPC.1998.733686","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733686","url":null,"abstract":"A method for combining multiuser detection with base station diversity is presented for the uplink of a multiple access network composed of K transmitters and M receivers. At each base station, a K user soft-output multiuser receiver is implemented using the log maximum a posteriori (log-MAP) algorithm. The log-likelihood ratio outputs from the M base stations are combined before a final hard decision is made. This strategy has the ability to simultaneously mitigate the detrimental effects of both multiuser interference and fading, and has the potential to extend cell range and reduce the frequency reuse distance. Simulation results are shown for a time division multiple access (TDMA) network with 3 users and 3 base stations.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"07 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":"124295089","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.1998.733627
J. Lu, K. B. Letaief, M. Liou, J. Chuang
In this paper, an efficient and reliable transmission system is proposed for multimedia transmission over mobile networks. In particular, multimedia data is represented in terms of its inherent correlation, and the transmission performance is characterized by transmission reliability and efficiency. Consequently, a joint source and channel coding scheme is devised in order to accomplish tradeoffs between transmission efficiency and reliability. Moreover, diversity reception is studied in terms of improved transmission reliability and reduced error protection. Numerical examples with both fixed and variable length coding algorithms are given to demonstrate that the proposed system performs very well under various operation conditions.
{"title":"Multimedia transmission with improved reliability and efficiency for wireless communications","authors":"J. Lu, K. B. Letaief, M. Liou, J. Chuang","doi":"10.1109/ICUPC.1998.733627","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733627","url":null,"abstract":"In this paper, an efficient and reliable transmission system is proposed for multimedia transmission over mobile networks. In particular, multimedia data is represented in terms of its inherent correlation, and the transmission performance is characterized by transmission reliability and efficiency. Consequently, a joint source and channel coding scheme is devised in order to accomplish tradeoffs between transmission efficiency and reliability. Moreover, diversity reception is studied in terms of improved transmission reliability and reduced error protection. Numerical examples with both fixed and variable length coding algorithms are given to demonstrate that the proposed system performs very well under various operation conditions.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"25 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":"125150385","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.1998.732801
I. Sohn, S.C. Gupta
This paper studies the performance of a blind adaptive multiuser receiver in slow and fast fading channels. The receiver consists of fractionally spaced equalizer, adaptive weight mechanism, matched filter, and differential decoder. Thus, the complexity of the receiver is slightly higher than the conventional receiver. The main problem of an adaptive multiuser receiver is the requirement of training sequences for the adaptation process. Due to time-varying interference and fading effect in time-correlated channels, the training sequence is difficult to obtain or becomes defective. The blind multiuser receiver considered in this paper does not require any training sequences, but retains all the advantages that adaptive receivers have. Simulation results show that the receiver is effective in fading channels with perfect power control and with near-far effect. The blind adaptive multiuser receiver is an attractive alternative to the conventional receiver in Rayleigh fading CDMA channels.
{"title":"Differentially coherent blind multiuser receiver for Rayleigh fading CDMA channels","authors":"I. Sohn, S.C. Gupta","doi":"10.1109/ICUPC.1998.732801","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732801","url":null,"abstract":"This paper studies the performance of a blind adaptive multiuser receiver in slow and fast fading channels. The receiver consists of fractionally spaced equalizer, adaptive weight mechanism, matched filter, and differential decoder. Thus, the complexity of the receiver is slightly higher than the conventional receiver. The main problem of an adaptive multiuser receiver is the requirement of training sequences for the adaptation process. Due to time-varying interference and fading effect in time-correlated channels, the training sequence is difficult to obtain or becomes defective. The blind multiuser receiver considered in this paper does not require any training sequences, but retains all the advantages that adaptive receivers have. Simulation results show that the receiver is effective in fading channels with perfect power control and with near-far effect. The blind adaptive multiuser receiver is an attractive alternative to the conventional receiver in Rayleigh fading CDMA channels.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"1 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":"124108112","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.1998.732810
Henry C. B. Chan, V. Leung
An ATM/MAN-based personal communication network (PCN) architecture is presented which combines the broadcast and distributed advantages of metropolitan area networks (MANs) for handling local traffic, and the high speed switching capability of asynchronous transfer mode (ATM) for wide area connectivity. A dynamic bandwidth allocation scheme is employed to integrate different types of traffic over MANs. Simulation results are presented to illustrate the advantages of the integration scheme. We also propose a suffix-dialing method for integrating existing telephone, fax, paging and e-mail services over ATM/MAN-based PCNs using a single personal identity number (PIN).
{"title":"Integrated telephone/fax/paging/e-mail services over ATM/MAN-based personal communication networks","authors":"Henry C. B. Chan, V. Leung","doi":"10.1109/ICUPC.1998.732810","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732810","url":null,"abstract":"An ATM/MAN-based personal communication network (PCN) architecture is presented which combines the broadcast and distributed advantages of metropolitan area networks (MANs) for handling local traffic, and the high speed switching capability of asynchronous transfer mode (ATM) for wide area connectivity. A dynamic bandwidth allocation scheme is employed to integrate different types of traffic over MANs. Simulation results are presented to illustrate the advantages of the integration scheme. We also propose a suffix-dialing method for integrating existing telephone, fax, paging and e-mail services over ATM/MAN-based PCNs using a single personal identity number (PIN).","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"322 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":"122620666","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.1998.732838
C. Johansson, L. De Verdier, F. Khan
The introduction of packet switched data in cellular systems requires new radio resource algorithms. For example, a scheduling algorithm is needed when more than one user may share the same physical channel, to determine the order in which users on the same channel should be allowed to transmit. This paper discusses the scheduling problem in general, and investigates the performance of three basic scheduling algorithms in an enhanced data rates for global GSM evolution/general packet radio service (EDGE/GPRS) system. Effort has been spent on modeling the bursty interference of a packet data network and using appropriate performance measures for the evaluation of such a network. The results indicate that the choice of scheduling discipline is very important, especially in a highly loaded system. With the performance measures used here, it is more important to consider the packet sizes than the users' different channel qualities.
{"title":"Performance of different scheduling strategies in a packet radio system","authors":"C. Johansson, L. De Verdier, F. Khan","doi":"10.1109/ICUPC.1998.732838","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732838","url":null,"abstract":"The introduction of packet switched data in cellular systems requires new radio resource algorithms. For example, a scheduling algorithm is needed when more than one user may share the same physical channel, to determine the order in which users on the same channel should be allowed to transmit. This paper discusses the scheduling problem in general, and investigates the performance of three basic scheduling algorithms in an enhanced data rates for global GSM evolution/general packet radio service (EDGE/GPRS) system. Effort has been spent on modeling the bursty interference of a packet data network and using appropriate performance measures for the evaluation of such a network. The results indicate that the choice of scheduling discipline is very important, especially in a highly loaded system. With the performance measures used here, it is more important to consider the packet sizes than the users' different channel qualities.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"1 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":"130949919","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.1998.733035
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.1998.733635
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.1998.733030
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}
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