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1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)最新文献

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Computation of a block-diagonal realization of a high-order filter via singular value decomposition 用奇异值分解实现高阶滤波器的块对角线计算
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655479
S. Mahil
{"title":"Computation of a block-diagonal realization of a high-order filter via singular value decomposition","authors":"S. Mahil","doi":"10.1109/ICPWC.1997.655479","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655479","url":null,"abstract":"In electronic communication, a high-order filter may be realized by a state-space realization. For implementation, a canonical form is useful. In this paper, a block-diagonal state-space realization is determined by using singular value decomposition. Certain parity-orthogonal transformations are determined first which are then employed to determine a block-diagonal realization of a high-order filter. The realization can be implemented as a parallel structure of second-order networks, and is always obtainable when the spectrum of the system matrix of the state-space description is separable into distinct groups relative to the modulus of the eigenvalues-not an unusual constraint in filters. The procedure avoids the use of eigenstructure routines which are not helpful for ill-conditioned matrices. Also, the parity-orthogonal transformations share some properties of orthogonal matrices; the inverse is obtainable from the transpose. The computations are, hence, simplified. The transformations and the procedure is demonstrated by an example.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127578602","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
Implementation of the maximum packing channel assignment algorithm in cellular networks 蜂窝网络中最大打包信道分配算法的实现
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655485
A. Kulshreshtha, K. Sivarajan
{"title":"Implementation of the maximum packing channel assignment algorithm in cellular networks","authors":"A. Kulshreshtha, K. Sivarajan","doi":"10.1109/ICPWC.1997.655485","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655485","url":null,"abstract":"The maximum packing algorithm (MPA) is a greedy algorithm, that rejects a call only when it is forced to do so, even if this involves rearrangement of channels assigned to the ongoing calls, without dropping any of them. This paper mainly concentrates on the performance of this algorithm in terms of the total carried traffic. We model the channel reuse constraints in the cellular network by a hypergraph. Previously (1996) we demonstrated the optimality of MPA for low and moderate offered traffic in the system. In this paper, we envisage MPA as a practical channel assignment algorithm, for moderate sized systems, and suggest a good strategy to implement it. We comment on the complexity of the algorithm and suggest approximations to reduce it.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127704010","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
On channel coding for CDMA over multipath Rayleigh fading channels 基于多径瑞利衰落信道的CDMA信道编码
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655566
A. Correia, F. Cercas
{"title":"On channel coding for CDMA over multipath Rayleigh fading channels","authors":"A. Correia, F. Cercas","doi":"10.1109/ICPWC.1997.655566","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655566","url":null,"abstract":"This work considers asynchronous DS-CDMA systems with single-user receivers. The focus, is on combined error control/PN sequence spreading. This work shows that the best performance is achieved when all the bandwidth expansion is by error control coding, instead of by PN sequences. This conclusion is valid for all types of fading channels. Comparisons of CDMA systems using different error control schemes are presented, keeping constant the total available bandwidth and the information rate. Both DBPSK and /spl pi//4 DQPSK modulation with noncoherent demodulation are analysed.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134513601","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
On throughput performance of single and multichannel S-ALOHA with exponential backoff retransmission schemes for packet transmissions in multiple power levels 基于指数回退重传的单通道和多通道S-ALOHA多功率分组传输的吞吐量性能研究
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655498
A.Z.M. Ekram Hossain, J. Sarker
{"title":"On throughput performance of single and multichannel S-ALOHA with exponential backoff retransmission schemes for packet transmissions in multiple power levels","authors":"A.Z.M. Ekram Hossain, J. Sarker","doi":"10.1109/ICPWC.1997.655498","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655498","url":null,"abstract":"The throughput of a single channel S-ALOHA protocol is analyzed under the full-load condition with a truncated exponential backoff retransmission control scheme considering the capture effect among packets sent at different power levels. Similar analyses are done for a multichannel S-ALOHA protocol with two proposed exponential backoff retransmission control schemes. The effects of the protocol parameters on the throughput performance are investigated. The analytical results are validated through simulation. Simulation results of the system throughput performance for under-load conditions are also presented.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124925449","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
Location of subchip radio channel multipath components from direct sequence sounding data 从直接序列测深数据中定位子芯片无线电信道多径分量
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655475
T. Korhonen, S. Haggman
{"title":"Location of subchip radio channel multipath components from direct sequence sounding data","authors":"T. Korhonen, S. Haggman","doi":"10.1109/ICPWC.1997.655475","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655475","url":null,"abstract":"This paper presents novel instantaneous, radio channel modeling algorithm. It is based on deconvolution and has four basic modules that are: (1) determination of initial estimate by matched filter deconvolution, (2) suppression of deconvolution noise, (3) selection of signal taps and (4) complex tap amplitude accuracy enhancement. The paper analyzes parameter selection and gives an outline of theoretical and simulated performance. As an example we note that the algorithm can achieve with 6 times oversampled 15 chip maximal length code and 5 Rayleigh channel taps an average amplitude accuracy enhancement of 8 dB to 19 dB compared to uncompensated optimum deconvolution when the channel SNR is 20 to 40 dB respectively.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122059314","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
Introduction scenarios for capacity enhancement techniques in GSM mobile radio networks-technical potentials and economic efficiencies GSM移动无线网络容量增强技术的介绍方案——技术潜力和经济效率
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655548
F. Graf, H. Ruse, J. Kruger
{"title":"Introduction scenarios for capacity enhancement techniques in GSM mobile radio networks-technical potentials and economic efficiencies","authors":"F. Graf, H. Ruse, J. Kruger","doi":"10.1109/ICPWC.1997.655548","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655548","url":null,"abstract":"From various publications the theoretical potential of different capacity enhancement techniques in GSM mobile radio networks is well known. Introduction scenarios for some capacity enhancement techniques in real GSM mobile radio networks are developed with respect to the technical and economical constraints of a network operator. Based on parameters and cell statistics which are typical for a operational country wide GSM mobile radio network, a reference scenario for the future network extension is developed. The comparison of introduction scenarios for different capacity enhancement techniques with this reference scenario allows the evaluation of each technique from the technical and economical points of view. A method for calculating the economic efficiency of the radio part for each scenario is presented.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131281974","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: 5
The role of coding in CDMA systems with multiuser detection 编码在多用户检测CDMA系统中的作用
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655564
V. Veeravalli
{"title":"The role of coding in CDMA systems with multiuser detection","authors":"V. Veeravalli","doi":"10.1109/ICPWC.1997.655564","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655564","url":null,"abstract":"In a direct sequence code division multiple access (CDMA) system, a fixed bandwidth expansion could be allocated to either error correcting coding or modulation signal spreading. The role of coding in CDMA systems that employ multiuser detection is explored here. A comparison is made between the maximum throughputs (in bits/chip or bits/s/Hz) achievable using multiuser detection and single-user detection, for both \"single-cell\" and cellular systems. For the single-cell scenario, our results indicate that asynchronous multiuser detection systems employing long (random) spreading sequences and low rate coding, can provide considerable improvements in spectral efficiency over single-user detection systems. However, for cellular systems with universal frequency reuse, the improvement is spectral efficiency (per cell) offered by multiuser detection may not be as significant.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131613377","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: 9
Minimizing energy consumption for wireless computers in Moby Dick 《白鲸记》中无线电脑的能耗最小化
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655530
P. Havinga, G. Smit
{"title":"Minimizing energy consumption for wireless computers in Moby Dick","authors":"P. Havinga, G. Smit","doi":"10.1109/ICPWC.1997.655530","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655530","url":null,"abstract":"The Moby Dick project is a joint European project to develop and define the architecture of a new generation of mobile hand-held computers, called Pocket Companions. The Pocket Companion is a hand-held device that is resource-poor, i.e. small amount of memory, limited battery life, low processing power, and connected with the environment via a network with variable connectivity. Because the battery life is limited and the battery weight is an important factor for the size and the weight of the Pocket Companion, energy management plays a crucial role in the architecture. In our architecture we apply several supplementary power reduction techniques on all levels of the system, including the operating system and applications. The two main themes are: (1) to avoid wasteful activity, and (2) to exploit the locality of the reference. We put considerable effort in reducing the energy consumption of the communication interfaces. There are several ways to reduce the energy consumption: e.g. by system decomposition, using hybrid networking, and by applying power aware MAC protocols.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126468899","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: 28
Global mobile personal communications by satellite (GMPCS), how will developing countries benefit? 全球移动个人卫星通信(GMPCS)，发展中国家将如何受益?
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655523
R. Westerveld
{"title":"Global mobile personal communications by satellite (GMPCS), how will developing countries benefit?","authors":"R. Westerveld","doi":"10.1109/ICPWC.1997.655523","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655523","url":null,"abstract":"Now that at least one of the proposed satellite systems for mobile personal communication has almost become a reality (e.g. Iridium has launched almost half of its planned satellites and others are to follow), the high potential of these systems for the developing world is stressed in many places. This paper gives an overview of developments in broadband satellite proposals. It also elaborates on some technical issues and regulatory problems involved with the introduction of these systems in the practical reality of the developing world.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121084781","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
Comparison of replication of the user mobility profile with caching for reduction of HLR accesses 比较用户移动性配置文件的复制与用于减少HLR访问的缓存
1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338) Pub Date : 1997-12-17 DOI: 10.1109/ICPWC.1997.655502
S. Palat, S. Andresen
{"title":"Comparison of replication of the user mobility profile with caching for reduction of HLR accesses","authors":"S. Palat, S. Andresen","doi":"10.1109/ICPWC.1997.655502","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655502","url":null,"abstract":"The widespread deployment of mobile personal communication services will lead to a tremendous increase in the number of real time updates and queries to the network databases. The centralised home location register (HLR) in GSM can be a potential bottleneck. Most users have regular calling and mobility patterns (or profiles) which can be used to reduce database accesses. Selective replication of the user mobility profiles (SRP) at the source-MSC/VLR can reduce HLR queries. Using GSM as the reference, this paper studies the cost of replicating user mobility profiles and compares its performance with caching the VLR number. It is shown that SRP performs better for a mobile which has a higher mobility rate compared to the incoming call rate from a switch. The paper also suggests a combined scheme with better overall performance.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130170033","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
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