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IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)最新文献

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Performance study for a DS/CDMA-based LEO satellite system-equatorial constellation 基于DS/ cdma的低轨卫星系统-赤道星座性能研究
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.776564
M. Lim, Erry Gunawan, Dubey Vimal Kishore
{"title":"Performance study for a DS/CDMA-based LEO satellite system-equatorial constellation","authors":"M. Lim, Erry Gunawan, Dubey Vimal Kishore","doi":"10.1109/GLOCOM.1998.776564","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.776564","url":null,"abstract":"Various performance studies have been done on CDMA-based LEO satellite network. However, most of these researches focus on satellite constellation with polar orbit due to its attractive commercial interest. Today, in view of the rapid growth in equatorial countries especially south east Asia (SEA), there is an urge to divert attention to this region. In this paper, the performance studies of the CDMA-based equatorial LEO satellite system are done on a downlink. The equatorial satellite constellation is based on the MERLION project, which is a joint satellite program of Nanyang Technological University and the University of Surrey. Henceforth, the effects of variation in elevation angles to the system performance is investigated based on the satellite constellation designed in the presence of multipath diversity and multisatellite diversity. The performance is reflected by the bit error rate of the various scenarios.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116305637","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
Performance of a channel borrowing scheme in multiservice cellular networks with reuse partitioning 具有复用分区的多业务蜂窝网络中信道借用方案的性能
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.775894
Jinsung Choi, J. Silvester
{"title":"Performance of a channel borrowing scheme in multiservice cellular networks with reuse partitioning","authors":"Jinsung Choi, J. Silvester","doi":"10.1109/GLOCOM.1998.775894","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.775894","url":null,"abstract":"The performance of a channel-borrowing scheme with different borrowing control policies in two-zone reuse partitioning in multiservice cellular networks is investigated via simulation in terms of call blocking probability and overall channel utilization. Reuse partitioning is a technique of using differing reuse factors to provide an increase in system capacity. We consider an asymmetric channel-borrowing scheme between zones in two-zone reuse partitioning and model it as a controlled Markovian queuing system and evaluate its performance via simulation. Several simulation results are presented and discussed. In this paper, we also address the problem of guaranteeing call-blocking probabilities of outer zone calls and provide a way to find the best channel borrowing control policy. Throughout the study, two classes of calls, narrowband and broadband are taken into account.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116348990","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
A-posteriori access strategies in all-optical slotted WDM rings 全光槽WDM环中的后置接入策略
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.775745
A. Bianco, V. Distefano, A. Fumagalli, Emilio Leonardi, F. Neri
{"title":"A-posteriori access strategies in all-optical slotted WDM rings","authors":"A. Bianco, V. Distefano, A. Fumagalli, Emilio Leonardi, F. Neri","doi":"10.1109/GLOCOM.1998.775745","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.775745","url":null,"abstract":"The paper compares a number of strategies devised to gain access in slotted multi-channel all-optical ring networks whose nodes have a distinct transmission queues for each channel and limited transmission/reception capabilities, i.e., one tunable transmitter and one fixed receiver. The considered access strategies can be subdivided into two groups, depending on the information used to select the next packet for transmission. \"A-priori\" strategies select the packet only according to the knowledge of the state of transmission queues. \"A-posteriori\" strategies rely on the knowledge of the state of both transmission queues and optical channels. A number of strategies belonging to the former group were recently proposed by the authors and offer an intrinsic hardware and algorithmic simplicity. Two novel strategies belonging to the latter group are proposed in this paper with the aim of assessing the trade-offs between complexity and overall system performance, including achievable throughput and queuing delay. Simulation results obtained under several traffic scenarios show that the increased complexity of a-posteriori strategies pays off in terms of performance.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122015495","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: 20
Combining data and voice communications on digital wireless networks 在数字无线网络上结合数据和语音通信
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.776579
S. Narayanaswamy, Jianying Hu, R. Kashi
{"title":"Combining data and voice communications on digital wireless networks","authors":"S. Narayanaswamy, Jianying Hu, R. Kashi","doi":"10.1109/GLOCOM.1998.776579","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.776579","url":null,"abstract":"Growing demand for access to mobile data and the advent of new digital wireless voice/data services motivate the design of a system that handles both voice and data traffic efficiently. We describe the design of a system for wireless voice and data communications. On the network side, we enhance a digital cellular/PCS basestation with a direct data connection to provide data services. On the terminal side, we describe a small, light wireless handset that uses a pen based user interface and handwriting recognition for access to data services.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122068865","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
M-ary/SS system using divided sequence frequency diversity M-ary/SS系统采用分序频分集
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.775914
S. Tachikawa, K. Nomoto
{"title":"M-ary/SS system using divided sequence frequency diversity","authors":"S. Tachikawa, K. Nomoto","doi":"10.1109/GLOCOM.1998.775914","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.775914","url":null,"abstract":"In this paper, we first present the BER degradation of M-ary/SS systems over a Rayleigh fading channel and its improvement by frequency diversity. Next, to use the diversity bandwidth more effectively, we propose a novel M-ary/SS system using divided sequence frequency diversity, in which the spreading sequence is divided to L branches and these divided sequences are transmitted by each different frequency carrier. In the receiver, the maximum likelihood decision is achieved by using the addition of each partial correlation value. Compared with M-ary/SS using conventional frequency diversity and FH/MFSK system, considerable improvement of the BER can be obtained according to the increment of L in the proposed system. Finally, a noncoherent receiver for the proposed system and its performance are shown.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123902128","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
Blind adaptive single-user receivers for DS-CDMA systems in frequency-selective fading channels 频率选择衰落信道中DS-CDMA系统的盲自适应单用户接收机
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.775967
M. Latva-aho
{"title":"Blind adaptive single-user receivers for DS-CDMA systems in frequency-selective fading channels","authors":"M. Latva-aho","doi":"10.1109/GLOCOM.1998.775967","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.775967","url":null,"abstract":"Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant single-user receivers in direct-sequence code-division multiple-access (DS-CDMA) systems. A modified version of the receiver, called the LMMSE-RAKE receiver, has previously shown promising performance in frequency-selective fading channels. In this paper, both the convergence and BER performance of an adaptive LMMSE-RAKE receiver is compared to several other known blind adaptive single-user receivers. The results show that the proposed blind adaptive receiver can be used to improve the convergence and BER performance in comparison to other known blind adaptive receivers.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123920695","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
A distributed-star overnet for global business applications 面向全球业务应用的分布式星型网络
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.776927
A. Leinwand
{"title":"A distributed-star overnet for global business applications","authors":"A. Leinwand","doi":"10.1109/GLOCOM.1998.776927","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.776927","url":null,"abstract":"As multinational corporations capitalize on the digital economy, industry analysts are predicting that the online distribution of global business applications will have enormous appeal. Given the Internet's funding history with the US Department of Defense, multinational corporations have discovered that the architecture of the Internet which routes nearly all of the world's Internet traffic through peering points, called network access points (NAPs), does not scale to meet the requirements of increasingly complex business applications. Many companies have turned to premium, next-generation overnets to bypass public Internet congestion and get greater quality of service (QoS). The result is an improved experience for the global customer accessing a company's Web site with no time-outs or lengthy download times so end users can complete transactions for sales, customer support and other e-commerce applications. This causes increased customer retention and loyalty that successfully impact profitability. Unlike the public Internet, the success of the overnet is largely due to its innovative distributed-star architecture, which was specifically designed for global e-commerce. By comparison, the Internet was architected to withstand a nuclear attack-not to deploy business IP applications.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125702208","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
Multi-cellular CDMA systems with interference cancellation: effects of path loss, shadowing and handover strategies 具有干扰消除的多蜂窝CDMA系统:路径损耗、阴影和切换策略的影响
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.775869
A. Lampe, R. Muller, J. Huber
{"title":"Multi-cellular CDMA systems with interference cancellation: effects of path loss, shadowing and handover strategies","authors":"A. Lampe, R. Muller, J. Huber","doi":"10.1109/GLOCOM.1998.775869","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.775869","url":null,"abstract":"Multi-cell CDMA systems with interference cancellation and powerful single-user channel coding close to the channel capacity are investigated for randomly chosen signature sequences and single cell site processing. Due to path loss and shadowing they show superior power and bandwidth efficiency on the AWGN channel compared with orthogonal multiple access. Moreover, attenuation controlled handover turns out to be significantly preferable in comparison with distance controlled handover if shadowing to different cell-sites is correlated.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125872887","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
Soft-input soft-output decoding of linear block codes based on ordered statistics 基于有序统计量的线性分组码软输入软输出译码
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.776584
M. Fossorier, Shu Lin
{"title":"Soft-input soft-output decoding of linear block codes based on ordered statistics","authors":"M. Fossorier, Shu Lin","doi":"10.1109/GLOCOM.1998.776584","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.776584","url":null,"abstract":"In this paper, reduced-complexity soft-input soft-output decoding of linear block codes is considered. The near-optimum low complexity soft decision decoding algorithm based on ordered statistics of Fossorier and Lin (1995) is modified so that soft outputs are delivered by the decoder. This algorithm performs nearly as well as the max-log-MAP decoding algorithm since in most cases, only the soft outputs corresponding to the least reliable bits may differ. For good (N,K,d/sub H/) block codes of length N/spl les/128, dimension K and minimum Hamming distance dH/spl les/4K, the corresponding decoding complexity is O((N-K)(K+1)n(d/sub H/,K)) real operations with n(d/sub H/,K)=/spl Sigma//sub i=0/([d/sub H//4])(/sub i//sup K/). Consequently, this algorithm allows to achieve practically the same error performance as the max-log-MAP decoding algorithm in iterative or concatenated systems with block codes for which the associated trellis complexity is simply too large for implementation of trellis based decoding algorithms.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124874190","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: 67
A two-phase queueing system with threshold 具有阈值的两阶段排队系统
IEEE GLOBECOM 1998 (Cat. NO. 98CH36250) Pub Date : 1998-11-08 DOI: 10.1109/GLOCOM.1998.775779
Tae Sung Kim, K. Chae
{"title":"A two-phase queueing system with threshold","authors":"Tae Sung Kim, K. Chae","doi":"10.1109/GLOCOM.1998.775779","DOIUrl":"https://doi.org/10.1109/GLOCOM.1998.775779","url":null,"abstract":"We consider a single-server, two-phase queueing system with N-policy. Customers arrive at the system according to a Poisson process and receive a batch service in the first phase followed by individual services in the second phase. When the server completes second phase services, if the system becomes empty, it is turned off. After an idle period, when the queue length reaches N (threshold), the server is turned on and begins to serve customers. We obtain the system size distribution and show that the system size decomposes into three random variables. The system sojourn time is provided. The mean queue waiting is also obtained by heuristic interpretation. Finally we derive a condition under which the optimal operating policy is achieved.","PeriodicalId":414137,"journal":{"name":"IEEE GLOBECOM 1998 (Cat. NO. 98CH36250)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129404681","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: 10
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