Pub Date : 1995-09-27DOI: 10.1109/PIMRC.1995.477328
G. Martin, M. Faulkner, M. Beach
{"title":"Comparison of delay spread measurements with ray tracing simulations at 1890 MHz","authors":"G. Martin, M. Faulkner, M. Beach","doi":"10.1109/PIMRC.1995.477328","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.477328","url":null,"abstract":"","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124088260","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.476272
A. Sampath, P. S. Kumar, J. Holtzman
Future wireless systems will have to support multimedia services such as voice, data and fax. Issues in providing multimedia services on wireless include multiple access, bandwidth rationing and power control. We address the latter two issues. CDMA is assumed to be the access method. Different services have different quality (QoS) requirements, maximum power and/or minimum rate constraints. In order to achieve the required QoS they can alter their power and/or rate of transmission. Different rates are represented by varying the processing gain. Since users interfere with each other, achieving each user's QoS requirement is completely coupled with the powers. We formulate this as a constrained optimization problem. The objective functions used are minimum power and maximum rates. The former reduces interference seen by other cells due to the current cell, the latter attempts to achieve the best possible throughput for users in the current cell. We develop bounds on the total number of users of each class that can be supported simultaneously while maintaining adequate QoS and meeting resource constraints.
{"title":"Power control and resource management for a multimedia CDMA wireless system","authors":"A. Sampath, P. S. Kumar, J. Holtzman","doi":"10.1109/PIMRC.1995.476272","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.476272","url":null,"abstract":"Future wireless systems will have to support multimedia services such as voice, data and fax. Issues in providing multimedia services on wireless include multiple access, bandwidth rationing and power control. We address the latter two issues. CDMA is assumed to be the access method. Different services have different quality (QoS) requirements, maximum power and/or minimum rate constraints. In order to achieve the required QoS they can alter their power and/or rate of transmission. Different rates are represented by varying the processing gain. Since users interfere with each other, achieving each user's QoS requirement is completely coupled with the powers. We formulate this as a constrained optimization problem. The objective functions used are minimum power and maximum rates. The former reduces interference seen by other cells due to the current cell, the latter attempts to achieve the best possible throughput for users in the current cell. We develop bounds on the total number of users of each class that can be supported simultaneously while maintaining adequate QoS and meeting resource constraints.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126207704","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.480977
L. Bömer, F. Burkert, J. Eichinger, R. Halfmann, W. Liegl, M. Werner
This paper focuses on a CDMA radio link with a 'turbo-decoding' (TD) scheme. The radio link concept is based on the requirements for third generation mobile radio communications. The performance of the CDMA link is evaluated for ATM service scenarios with 32 kbit/s low-delay speech and 64 kbit/s data transmission. For this reason, Monte-Carlo simulations based on measured mobile radio impulse responses are performed. As a reference to which TD can be compared, a one-dimensional convolutional code with soft-decision Viterbi decoding (VD) is alternatively used. The simulation results show that a single coding scheme with TD may be advantageously applied for data as well as for low-delay speech services.
{"title":"A CDMA radio link with 'turbo-decoding': concept and performance evaluation","authors":"L. Bömer, F. Burkert, J. Eichinger, R. Halfmann, W. Liegl, M. Werner","doi":"10.1109/PIMRC.1995.480977","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480977","url":null,"abstract":"This paper focuses on a CDMA radio link with a 'turbo-decoding' (TD) scheme. The radio link concept is based on the requirements for third generation mobile radio communications. The performance of the CDMA link is evaluated for ATM service scenarios with 32 kbit/s low-delay speech and 64 kbit/s data transmission. For this reason, Monte-Carlo simulations based on measured mobile radio impulse responses are performed. As a reference to which TD can be compared, a one-dimensional convolutional code with soft-decision Viterbi decoding (VD) is alternatively used. The simulation results show that a single coding scheme with TD may be advantageously applied for data as well as for low-delay speech services.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126477162","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.480990
J. Caffery, Gordon L. Stüber
A radio location method for code-division multiple-access (CDMA) microcellular networks is investigated. The method discussed focuses on the use of time difference of arrival (TDOA) estimates for deriving the position of a mobile unit in a CDMA system, where the transmitted signal is received by several base stations (BSs). The TDOA estimates are obtained by using a delay-lack loop. A similar method is used in the global position system (GPS), but its performance in an urban microcellular propagation environment has not been previously studied. Simulation results are given for different radio propagation environments.
{"title":"Radio location in urban CDMA microcells","authors":"J. Caffery, Gordon L. Stüber","doi":"10.1109/PIMRC.1995.480990","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480990","url":null,"abstract":"A radio location method for code-division multiple-access (CDMA) microcellular networks is investigated. The method discussed focuses on the use of time difference of arrival (TDOA) estimates for deriving the position of a mobile unit in a CDMA system, where the transmitted signal is received by several base stations (BSs). The TDOA estimates are obtained by using a delay-lack loop. A similar method is used in the global position system (GPS), but its performance in an urban microcellular propagation environment has not been previously studied. Simulation results are given for different radio propagation environments.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127954748","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.480908
Ming-Shan Kwok, Hong-Shen Wang
The effect of adjacent cell interference on the system capacity is investigated. Hexagonal and circular cell approaches are used. The amount of interference from the six adjacent cells of the first tier is obtained by a numerical method in the hexagonal cell approach. We use a circle to approximate the hexagonal cell and a closed-form solution is obtained. By the circular cell approach, the adjacent cell interference function is derived. The total adjacent cell interference is found by the adjacent cell interference function obtained. Generalization of the analysis to an irregular cell structure is also presented.
{"title":"Adjacent cell interference analysis of reverse-link in CDMA cellular radio systems","authors":"Ming-Shan Kwok, Hong-Shen Wang","doi":"10.1109/PIMRC.1995.480908","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480908","url":null,"abstract":"The effect of adjacent cell interference on the system capacity is investigated. Hexagonal and circular cell approaches are used. The amount of interference from the six adjacent cells of the first tier is obtained by a numerical method in the hexagonal cell approach. We use a circle to approximate the hexagonal cell and a closed-form solution is obtained. By the circular cell approach, the adjacent cell interference function is derived. The total adjacent cell interference is found by the adjacent cell interference function obtained. Generalization of the analysis to an irregular cell structure is also presented.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"362 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121732448","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.476898
Ulrich Dropmann, X. Lagrange, P. Godlewski
We present an architecture for a system with multi-cell centralized packet access. In micro- or pico-cellular environments, the coverage overlap by adjacent antenna units arises naturally, which means that a signal emitted by a mobile terminal is multiple received. The whole service area of the system is parceled out into small coverage zones, to which channels are dynamically allocated. For such a dynamic channel allocation to be effective, the system has to attach the mobile terminals to the zones of allocation, based on the strength of the received signal. We study the problem of this fine-localization of the mobile terminals in the presence of fast fading.
{"title":"Architecture of a multi-cell centralized packet access system","authors":"Ulrich Dropmann, X. Lagrange, P. Godlewski","doi":"10.1109/PIMRC.1995.476898","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.476898","url":null,"abstract":"We present an architecture for a system with multi-cell centralized packet access. In micro- or pico-cellular environments, the coverage overlap by adjacent antenna units arises naturally, which means that a signal emitted by a mobile terminal is multiple received. The whole service area of the system is parceled out into small coverage zones, to which channels are dynamically allocated. For such a dynamic channel allocation to be effective, the system has to attach the mobile terminals to the zones of allocation, based on the strength of the received signal. We study the problem of this fine-localization of the mobile terminals in the presence of fast fading.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132480916","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.477364
S. He, M. Torkelson
Abst~actEfficient computation of partial DFT for comb spectrum evaluation is of essential importance for the emerging OFDM system. A new pruning algorithm has been proposed recently in [l], which has a computational complexity of O(N+Mlog M), instead of O(N1og M), that of previous approaches for general partial DFT computation. A straightforward lattice decomposition approach, which has the complexity of O ( N + M 2 ) but more suitable for parallel processing, and a VLSI architecture with linear systolic array implementation are presented here. The application of distributed arithmetic to pipelined bit-serial complex multiplier allows each multiplier in the processing elements takes the area equivalent to 2 real multipliers and the processor to be bit-level pipelined. A significant advantage over conventional implementation is that tuning to different channels can be easily accomplished by changing the coefficients without altering the data flow.
{"title":"VLSI computation of the partial DFT for (de)modulation in multi-channel OFDM system","authors":"S. He, M. Torkelson","doi":"10.1109/PIMRC.1995.477364","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.477364","url":null,"abstract":"Abst~actEfficient computation of partial DFT for comb spectrum evaluation is of essential importance for the emerging OFDM system. A new pruning algorithm has been proposed recently in [l], which has a computational complexity of O(N+Mlog M), instead of O(N1og M), that of previous approaches for general partial DFT computation. A straightforward lattice decomposition approach, which has the complexity of O ( N + M 2 ) but more suitable for parallel processing, and a VLSI architecture with linear systolic array implementation are presented here. The application of distributed arithmetic to pipelined bit-serial complex multiplier allows each multiplier in the processing elements takes the area equivalent to 2 real multipliers and the processor to be bit-level pipelined. A significant advantage over conventional implementation is that tuning to different channels can be easily accomplished by changing the coefficients without altering the data flow.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130449476","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.476269
A. Sesay, M. Gibbard
The authors propose an asymmetric structure with reduced complexity at the portable. It uses a decision feedback equalizer (DFE) at the base station to equalize data from the portable and a Tomlinson-Harashima precoder with its forward filter (TH-FF) at the base station to pre-equalize transmission to the portable. All the filters are characterized using available information at the base station only. Performance results presented include bit error rates, signal powers and spectral densities for data rates between 10 to 100 Mbits/s and sensitivity to automatic gain control errors. Using custom designed ASIC, the complexity at the base station appears feasible for up to a 20 Mbits/s rate.
{"title":"Asymmetric signal processing for indoor wireless LANs","authors":"A. Sesay, M. Gibbard","doi":"10.1109/PIMRC.1995.476269","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.476269","url":null,"abstract":"The authors propose an asymmetric structure with reduced complexity at the portable. It uses a decision feedback equalizer (DFE) at the base station to equalize data from the portable and a Tomlinson-Harashima precoder with its forward filter (TH-FF) at the base station to pre-equalize transmission to the portable. All the filters are characterized using available information at the base station only. Performance results presented include bit error rates, signal powers and spectral densities for data rates between 10 to 100 Mbits/s and sensitivity to automatic gain control errors. Using custom designed ASIC, the complexity at the base station appears feasible for up to a 20 Mbits/s rate.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134035181","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.480999
S. Nor
Carrier sense multiple access with collision avoidance (CSMA-CA) will be used as the basic medium access control (MAC) protocol for wireless LANs. Wireless LAN will be supporting two types of services, time bounded and asynchronous data transmission. In this paper we present simulation results for throughput and delays for a distributed radio LAN for different values of inter frame spacing periods, transmission speeds and number of nodes. Depending on the application, the results obtained suggest that proper inter frame space values have to be chosen for optimal network performance.
{"title":"Performance of CSMA-CA MAC protocol for distributed radio local area networks","authors":"S. Nor","doi":"10.1109/PIMRC.1995.480999","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.480999","url":null,"abstract":"Carrier sense multiple access with collision avoidance (CSMA-CA) will be used as the basic medium access control (MAC) protocol for wireless LANs. Wireless LAN will be supporting two types of services, time bounded and asynchronous data transmission. In this paper we present simulation results for throughput and delays for a distributed radio LAN for different values of inter frame spacing periods, transmission speeds and number of nodes. Depending on the application, the results obtained suggest that proper inter frame space values have to be chosen for optimal network performance.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134207465","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 : 1995-09-27DOI: 10.1109/PIMRC.1995.477326
L. Chang, A. Noerpel, A. Ranade
The FCC has allocated the band between 1920 MHz and 1930 MHz for Unlicensed Personal Communications Services (UPCS) using isochronous or circuit-switched operation. The UPCS spectrum lies between the licensed Terminal interoperability between private indoor wireless systems using the UPCS spectrum and public PCS systems using licensed spectrum is desirable and is encouraged by the FCC. In previous papers, a port channel assignment process based on the FCC etiquette for the Personal Access Communications Service-Unlicensed B (PACS-UB), a version of PACS modified for unlicensed operation, was described, and the corresponding uplink and downlink performance were presented. Results indicated that uplink SINR performance is inferior to that of the downlink by as much as 8 dB. In this paper, uplink power control is ’ employed to improve the performance. It is found that, with uplink power control, a 5.5 to 7 dB improvement in the uplink SINR can be achieved even for high traffic load.
{"title":"Performance of PACS-UB for unlicensed operation with uplink power control","authors":"L. Chang, A. Noerpel, A. Ranade","doi":"10.1109/PIMRC.1995.477326","DOIUrl":"https://doi.org/10.1109/PIMRC.1995.477326","url":null,"abstract":"The FCC has allocated the band between 1920 MHz and 1930 MHz for Unlicensed Personal Communications Services (UPCS) using isochronous or circuit-switched operation. The UPCS spectrum lies between the licensed Terminal interoperability between private indoor wireless systems using the UPCS spectrum and public PCS systems using licensed spectrum is desirable and is encouraged by the FCC. In previous papers, a port channel assignment process based on the FCC etiquette for the Personal Access Communications Service-Unlicensed B (PACS-UB), a version of PACS modified for unlicensed operation, was described, and the corresponding uplink and downlink performance were presented. Results indicated that uplink SINR performance is inferior to that of the downlink by as much as 8 dB. In this paper, uplink power control is ’ employed to improve the performance. It is found that, with uplink power control, a 5.5 to 7 dB improvement in the uplink SINR can be achieved even for high traffic load.","PeriodicalId":433500,"journal":{"name":"Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133994666","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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