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2005 2nd International Symposium on Wireless Communication Systems最新文献

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Capacity of Suboptimal Decoders for Coded Multiple-Input Multiple-Output Systems 编码多输入多输出系统的次优解码器容量
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547645
Pansop Kim, K. Chugg
{"title":"Capacity of Suboptimal Decoders for Coded Multiple-Input Multiple-Output Systems","authors":"Pansop Kim, K. Chugg","doi":"10.1109/ISWCS.2005.1547645","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547645","url":null,"abstract":"The optimal detector for coded multiple antenna systems is too complex to be implemented. We thus consider number of decouplers: the linear zero-forcing equalizer, the linear minimum mean-squared error equalizer (LMMSE), the successive soft/hard interference canceller, and the parallel soft/hard interference canceller. The constrained capacities of these decouplers are analyzed. It is shown that the capacity of the LMMSE is larger than those of the other decouplers although the general belief is that the interference cancellation schemes are better than linear filters. It is also shown that the LMMSE maximizes each sub-channel capacity. We discuss the likelihood value derivation from the decouplers, which can be used for decoding error correction codes. The performance of parallel transmission of turbo-coded symbols is given to support the constrained capacity analysis","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120816975","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 the QoS-capable transport in the IP-based UTRAN 基于ip的UTRAN中具有qos功能的传输
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547712
A. Samhat, T. Chahed
{"title":"On the QoS-capable transport in the IP-based UTRAN","authors":"A. Samhat, T. Chahed","doi":"10.1109/ISWCS.2005.1547712","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547712","url":null,"abstract":"In this paper, we highlight different architectures and techniques for transport of user traffic in the IP-based UMTS terrestrial radio access network (UTRAN) taking into account the real-time nature of the transport therein. Indeed, the UTRAN imposes severe delay bounds on the transport of both real-time and non real-time traffic. In this context, we provide an overview of different QoS-capable transport architecture options, such as DiffServ and MPLS. We also discuss multiplexing schemes that shall reduce overheads and hence achieve an efficient utilization of limited wired resources. We investigate these transport options and their relative merits taking into account several factors including transport infrastructure and network topology","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125823666","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
Dual-Frequency Ring Patch Antennas for GPS GPS双频环形贴片天线
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547774
Shoichi Kumagai, Y. Kazama, N. Goto
{"title":"Dual-Frequency Ring Patch Antennas for GPS","authors":"Shoichi Kumagai, Y. Kazama, N. Goto","doi":"10.1109/ISWCS.2005.1547774","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547774","url":null,"abstract":"Global positioning system (GPS) is widely used for car-navigation system all over the world. At present, GPS system employs only the frequency of 1.57542 GHz (L1) in the civilian use. Recently, to improve the positioning accuracy, GPS modernization enterprise is scheduled and executing. For the final stage new GPS satellites which is launched in 2014, additional two new frequency signal transmitters that are for the frequency of 1.22760 GHz (L2) and 1.17645 GHz (LS) is equipped. Prior to the final stage, the first stage new GPS satellites are launched in July, 2005. This satellite equips the transmitters for the frequencies of 1.57542 GHz (L1) and 1.22760 GHz (L2). In this paper, we propose compact, small, and low-profile dual-frequency operation microstrip antennas for this first stage new GPS system","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123571042","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
Development of a Wireless Application for Remote Control of Space Test Facilities 空间试验设备无线远程控制应用研究
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547783
S. Scaranzin, E. Bonelli, F. Saito, F. Scortecci
{"title":"Development of a Wireless Application for Remote Control of Space Test Facilities","authors":"S. Scaranzin, E. Bonelli, F. Saito, F. Scortecci","doi":"10.1109/ISWCS.2005.1547783","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547783","url":null,"abstract":"A wireless application based on a PDA and a mobile phone has been developed at AEROSPAZIO Tecnologie to allow remote control of space test facilities and increase the staff mobility. The application developed in house has been compared with the available software over different networks. The test activities and results are described","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122604143","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
Joint Estimation of Channel Parameters for MIMO Communication Systems MIMO通信系统信道参数的联合估计
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547647
Ji Li, J. Conan, S. Pierre
{"title":"Joint Estimation of Channel Parameters for MIMO Communication Systems","authors":"Ji Li, J. Conan, S. Pierre","doi":"10.1109/ISWCS.2005.1547647","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547647","url":null,"abstract":"In the next generation mobile communication systems, high data rates and high capacity are expected if multiple antennas are used at both receive and transmit sides. Such a radio propagation channel constitutes a multiple-input multiple-output (MIMO) system. In a wireless MIMO system, it is possible to estimate channel parameters in a multipath environment by extending the classical parameter estimation methods to the joint space and time domain. In this paper, we propose a subspace-based approach to jointly estimate the angle-of-arrival (AOA), angle-of-departure (AOD) and delay-of-arrival (DOA) of digitally modulated multipath signals in MIMO communication systems. The novel approach uses a collection of estimates of a space-time manifold vector of the channel which utilizes a Khatri-Rao product to transfer the estimated channel response matrix to the classical model. Simulation results show that the proposed methods can achieve high resolution of channel parameters and resolve more multipath components than the number of array elements","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114586768","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: 56
Performance of Heterogeneous Traffic in Roaming Based Sharing Multi-Operator WCDMA Networks 基于漫游的共享多运营商WCDMA网络异构业务性能研究
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547728
Y. Al-Jarbou, U. Baroudi
{"title":"Performance of Heterogeneous Traffic in Roaming Based Sharing Multi-Operator WCDMA Networks","authors":"Y. Al-Jarbou, U. Baroudi","doi":"10.1109/ISWCS.2005.1547728","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547728","url":null,"abstract":"Today, sharing radio resources is very important to reduce the cost of network infrastructure. Mobile companies can buy a certain capacity of the shared network depending on their budget and number of subscribers that they can handle. In this way, the subscribers of each operator connect to the same radio access network and can be differentiated through roaming based mechanisms. The analysis of voice traffic and video streaming for shared networks has been discussed in the literature. In this paper, an extended work has been done to study the effect of heavy data traffic like WWW and FTP on the shared network and how the radio resources with roaming based mechanism may be allocated to the sharing operators. One particular mechanism based on radio resource management (RRM) with preemptive priority queuing in admission control is discussed in details. The results show the effectiveness of the dynamically prioritization mechanism for allocating radio resources to the requested service. Also, it shows an outstanding performance for RT users compared with non preemptive scheme with little degradation for NRT users","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122113796","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
Distortionless PAPR Reduction Method for Existing OFDM Systems 现有OFDM系统的无失真PAPR降低方法
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547730
M. Saito, A. Okuda, M. Okada, Heiichi Yamamoto
{"title":"Distortionless PAPR Reduction Method for Existing OFDM Systems","authors":"M. Saito, A. Okuda, M. Okada, Heiichi Yamamoto","doi":"10.1109/ISWCS.2005.1547730","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547730","url":null,"abstract":"In this paper, we propose a distortionless PAPR (peak-to-average power ratio) reduction method for applying to existing OFDM systems, for example IEEE 802.11a/g/n wireless LAN or ADSL and so on. The proposed method estimates the PAPR of output OFDM symbol through the emulation of the lower layer operations. If the estimated PAPR is larger than the required value, we continue permutes binary data according to prepared mapping functions until the requirement is satisfied or reach to preset maximum number of iterations. Simulation results based on the parameters of IEEE 802.11a standard show that the proposed method can effectively lower the distributions of PAPR. When nonlinear amplifier is assumed, 2 or 4 times of iterations are enough to suppress the out-of-band emission effectively","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117103510","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
Performance Analysis of Concurrent Multicast / TCP Traffic Over Lossy High Delay Links 高时延链路上并发组播/ TCP流量的性能分析
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547810
S. Ehlert, D. Sisalem, Adam Wolisz
{"title":"Performance Analysis of Concurrent Multicast / TCP Traffic Over Lossy High Delay Links","authors":"S. Ehlert, D. Sisalem, Adam Wolisz","doi":"10.1109/ISWCS.2005.1547810","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547810","url":null,"abstract":"In this paper we investigate the performance of TCP-friendly congestion controlled multicast traffic over satellite links, an example for a multicast congestion control protocol we simulate multicast enhanced loss-delay based adaptation (MLDA) error links showing the typical loss and delay characteristics of satellite links. In the context of our investigation we concentrate on performance of MLDA over satellite links in terms of bandwidth utilization and fairness towards different TCP versions (Westwood, Hybla). Finally we show that through the use of loss differentiation scheme the performance of MLDA can be decreased considerably","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128442340","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 Measuring SSL-based Secure Data Transfer with Handheld Devices 用手持设备测量基于ssl的安全数据传输
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547731
D. Berbecaru
{"title":"On Measuring SSL-based Secure Data Transfer with Handheld Devices","authors":"D. Berbecaru","doi":"10.1109/ISWCS.2005.1547731","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547731","url":null,"abstract":"The secure sockets layer (SSL) security protocol is largely used nowadays by the World Wide Web to secure Internet communications and an increasing number of handheld devices are provided by the manufacturers with preinstalled applications (e.g. Web browsers) and digital certificates in order to support SSL in wireless environments too. We present first a comprehensive analysis of SSL protocol and the cryptographic algorithms used as building blocks in the protocol. We demonstrate next that SSL support embedded also in other applications for some mobile devices does not impact significantly on overall application's performance when communicating with other parties. We wanted to use for our experimental setup, APIs and tools that are either available for the majority of the handheld devices or that can be downloaded and tested freely and without major modifications. This is the especially the case of application developers, who preferably would not use modified versions of cryptographic libraries and special drivers characteristic to academic/commercial testing environments. We also developed a tool named SSLperf (SSL performance) for testing SSL security protocol's performance when transferring either small amounts of data (e.g. credit card number) or of medium dimension (e.g. a document in PDF format), with handheld devices. We've compared the results obtained with SSLperf on Windows CE-enabled handheld and pocket PCs and 'powerful' Windwos 2000/XP-enabled platforms with other related works","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129478871","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: 23
Space-Time Orthogonal M-ary PPM (STOMP) coding for Coverage Extension of MIMO UWB-IR Systems MIMO UWB-IR系统覆盖扩展的空时正交M-ary PPM (STOMP)编码
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547700
E. Baccarelli, M. Biagi, C. Pelizzoni, N. Cordeschi, F. Garzia
{"title":"Space-Time Orthogonal M-ary PPM (STOMP) coding for Coverage Extension of MIMO UWB-IR Systems","authors":"E. Baccarelli, M. Biagi, C. Pelizzoni, N. Cordeschi, F. Garzia","doi":"10.1109/ISWCS.2005.1547700","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547700","url":null,"abstract":"The wide-band nature of ultra-wide band impulse radio (UWB-IR) systems, recently proposed as the winner candidate for IEEE 802.15.3a standard, presents as a drawback the poor coverage, mainly in faded scenario where, according to FCC Part 15 rules for power spectral mask emission, the power is extremely limited. So, in order to achieve a target BER typical of multimedia applications, it is impossible to assure high performance without requiring the user terminals very close to UWB stations. The only way to solve this limitations is a diversity approach, and, since the employment of multiple-antenna systems does not seem to be expensive, in this contribution multiple-antenna UWB-IR systems are taken into account, by proposing coding schemes and corresponding detectors, (in the general case of partial channel knowledge) in order to improve performance in terms of coverage and BER","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"344 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123324111","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
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