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1st International Symposium onWireless Communication Systems, 2004.最新文献

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Performance enhancements in OFDM-WLAN systems using MIMO access techniques 使用MIMO接入技术的OFDM-WLAN系统的性能增强
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407284
E. Lima, S. J. Flores, V. Almenar, Amparo Girona
{"title":"Performance enhancements in OFDM-WLAN systems using MIMO access techniques","authors":"E. Lima, S. J. Flores, V. Almenar, Amparo Girona","doi":"10.1109/ISWCS.2004.1407284","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407284","url":null,"abstract":"In this paper we examine the improvements in the performance of a broadband OFDM-based system using MIMO techniques. The MIMO techniques evaluated are VBLAST, SFBC, STBC and subcarrier by subcarrier selection. Performance results are presented for coded and uncoded system, for a typical indoor scenario.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114102646","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
On the IEEE 802.11 IBSS and its timer synchronization function in multi-hop ad hoc networks IEEE 802.11 IBSS及其在多跳自组织网络中的定时同步功能研究
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407258
P. Rauschert, A. Honarbacht, A. Kummert
{"title":"On the IEEE 802.11 IBSS and its timer synchronization function in multi-hop ad hoc networks","authors":"P. Rauschert, A. Honarbacht, A. Kummert","doi":"10.1109/ISWCS.2004.1407258","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407258","url":null,"abstract":"Wireless ad hoc networks are sophisticated and flexible communication systems. No specific infrastructure is necessary, since the stations establish all communications in a self-organizing manner. Nowadays, the IEEE 802.11 standard is widely used for wireless broad bandwidth networks that even supports an ad hoc mode. Here, the timer synchronization function (TSF) is used to synchronize all stations within a single-hop environment. Lately, a modification of this scheme named adaptive timer synchronization function (ATSF) has been proposed to improve the performance for dense single-hop networks. For larger scale networks, where stations are spread over a wider area, multi-hop communication is an essential requirement. Thus, the scalability of these synchronization schemes within such scenarios is of great interest. Here, the wireless wide area network simulator (WWANS) affords detailed analysis. This paper presents some new results on different scenarios and summarizes the main behavior of these schemes within multi-hop networks.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123168719","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: 11
Multi-slot capability increases GPRS network performance 多插槽能力提高GPRS网络性能
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407228
Yan Zhang, B. Soong
{"title":"Multi-slot capability increases GPRS network performance","authors":"Yan Zhang, B. Soong","doi":"10.1109/ISWCS.2004.1407228","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407228","url":null,"abstract":"In this paper, we analyze the performance of GSM/GPRS networks with the emphasis on the study of the adaptive characteristics implied by multi-slot capability. Previous work employing the multi-slot service commonly assume that one or two channels are required by a GPRS data request for the sake of analytical simplicity. In this paper, we remove this assumption and generalize the GPRS data channel requirement (M channels). In addition, we propose a channel re-allocation schemes (RAS) upon channel release by re-allocating the released channels to the GPRS data which is currently using less than M channels with the potential to fully utilize the available resources. The result shows that RAS can significantly decrease the voice call blocking probability and the GPRS packet transmission time, and simultaneously increase the channel utilization with negligible penalty on GPRS packet blocking probability. Small M (e.g. M = 2) underestimates the performance achievements of the prior channel allocation scheme as well as RAS, which shows that the multi-slot capability in GPRS network is able to increase the system performance.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"14 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128427233","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
Delivery of digital television to handheld devices 向手持设备传送数字电视
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407245
C. Herrero, P. Vuorimaa
{"title":"Delivery of digital television to handheld devices","authors":"C. Herrero, P. Vuorimaa","doi":"10.1109/ISWCS.2004.1407245","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407245","url":null,"abstract":"Television reception is the next challenge mobile handheld terminals will face, which already receive FM radio and can access to Internet. User cases include relaxation at idle times during travels, video information services for business users, entertainment clips and cartoons. This paper introduces two different wireless technologies, DVB-H and MBMS, which can be used to receive digital television in handheld devices. The paper presents both technologies as feasible solutions for the video broadcasting scenario, compares their performance, and it finally tells about their limitations.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128432665","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: 15
Effect of antenna element properties and array orientation on performance of MIMO systems 天线单元特性和阵列方向对MIMO系统性能的影响
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407221
A. Pal, Beng-Sin Lee, Pr Rogers, Geoff Hilton, M. Beach, Andrew R Nix
{"title":"Effect of antenna element properties and array orientation on performance of MIMO systems","authors":"A. Pal, Beng-Sin Lee, Pr Rogers, Geoff Hilton, M. Beach, Andrew R Nix","doi":"10.1109/ISWCS.2004.1407221","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407221","url":null,"abstract":"This paper presents a MIMO throughput based assessment of three candidate antenna arrays, each of which was constructed from a different type of antenna element. A model of the MIMO channel resolved in orthogonal polarization planes was employed to apply multipath parameters of the channel to antenna array patterns, in order to predict the antenna-gain inclusive channel response. Based on simulations of the antenna inclusive channel, an analysis of the effect of antenna element properties including directivity, efficiency and polarization on the statistics of the overall MIMO channel response is presented.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128540944","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 simple data relay process and turbo code application to wireless sensor networks 一个简单的数据中继过程和turbo码应用于无线传感器网络
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407277
T. Yamazato, Hiraku Okada, M. Katayama, A. Ogawa
{"title":"A simple data relay process and turbo code application to wireless sensor networks","authors":"T. Yamazato, Hiraku Okada, M. Katayama, A. Ogawa","doi":"10.1109/ISWCS.2004.1407277","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407277","url":null,"abstract":"In this study, we focus on relay process of intermediate node of wireless sensor networks. In conventional wireless sensor networks, the intermediate node performs the regenerative repeating process such that error correction, detection and re-encoding are processed. This is reliable, but it requires a lot of processing effort and may take much energy. To reduce a burden of relay process, we propose to omit error decoding and/or re-encoding process at the intermediate nodes. Further, we propose a method that realizes soft-decision decoding for hard-detected signals. With this method, we can employ turbo code to wireless sensor networks. As results, we show that though omitting the decoding and re-encoding process at the intermediate node may not affect much to the performance.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116768032","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: 4
Mobile IP movement detection optimizations in 802.11 wireless LANs 802.11无线局域网中的移动IP移动检测优化
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407276
Albert Hasson, N. Ventura, S. Shepstone
{"title":"Mobile IP movement detection optimizations in 802.11 wireless LANs","authors":"Albert Hasson, N. Ventura, S. Shepstone","doi":"10.1109/ISWCS.2004.1407276","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407276","url":null,"abstract":"When an IEEE 802.11 mobile node moves from an access point in one IP network to an adjacent access point on a different network, an IP-layer handoff takes place that consists of a sequence of processes. Mobile IP allows the node to perform an IP handoff without breaking its active sessions. However, this handoff introduces an interruption in these sessions. Different mechanisms cooperate to allow a mobile node to perform a mobile IP handoff. The movement detection process, whereby a mobile node becomes aware that it is on a new network, contributes significantly to the handover latency and resulting interruption. Recent recommendations that aim to minimize movement detection delay are explored along with their implications. This paper discusses the design of a framework that will be used to evaluate different movement detection optimizations, with the intention of finding a hybrid solution that effectively minimizes mobile IP handoff delays. It is expected that by passing link-layer information to mobile IP, faster movement detection can be achieved.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128878903","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: 4
Ultra-wide bandwidth communication channel analysis using 3-D ray tracing 利用三维光线追踪技术分析超宽带通信信道
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407286
Yongwei Zhang, A. Brown
{"title":"Ultra-wide bandwidth communication channel analysis using 3-D ray tracing","authors":"Yongwei Zhang, A. Brown","doi":"10.1109/ISWCS.2004.1407286","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407286","url":null,"abstract":"A true 3-D ray tracing model has been developed for UWB propagation in a typical modern office. A time domain approach is used to determine all dominant paths by which radiation radiates from a transmitter to a receiving site. The number of rays that have to be considered can then be dramatically reduced for subsequent analyses. The properties of received power and delay spread as well as angle of arrival are presented. Each dominant path could then be represented by a function with these properties. Predictions of received waveform are produced by convolving a typical input UWB pulse with these functions. Hence, different input pulse characteristics can be applied to the transmit antenna and the receiver characteristics rapidly evaluated. The model also gives the transmission direction for each successful ray, which is difficult to measure in reality but essential to build the smart antenna.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132683381","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
Least-hop routing analysis of on-demand routing protocols 按需路由协议的最小跳路由分析
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407240
Chao Gao, R. Jäntti
{"title":"Least-hop routing analysis of on-demand routing protocols","authors":"Chao Gao, R. Jäntti","doi":"10.1109/ISWCS.2004.1407240","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407240","url":null,"abstract":"Wireless ad hoc networks are sensitive to energy consumption because the network nodes are battery operated. So far in practical ad hoc networks such as IEEE 802.11, there is no power control. This implies that to find a least-hop route from source to destination results in most energy efficient performance. In this paper, we analyze the route establishment procedure of the reactive routing protocols. When the route request packet RREQ propagates from source to destination, it suffers processing delay and potential congestion delay at each hop. Due to possible congestion, the RREQ packet first received by the destination does not necessarily correspond to the minimum hop route. The expected propagation delay along one path is discussed and we assert that it is proportional to the hop count of the path and the packet congestion probability p in term of p/(1-p). Then numerical analysis is given for the probability that the least-hop path is selected. Later we deploy two methods to improve the least-hop routing probability. The simulation shows the possibility that a least-hop route to be selected is increase.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130610504","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
Multi-metric routing decisions for ad hoc networks using fuzzy logic 基于模糊逻辑的自组织网络多度量路由决策
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407278
S. Rea, D. Pesch
{"title":"Multi-metric routing decisions for ad hoc networks using fuzzy logic","authors":"S. Rea, D. Pesch","doi":"10.1109/ISWCS.2004.1407278","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407278","url":null,"abstract":"Routing is an essential function for traffic management in ad hoc networks. Table-based routing algorithms used in proactive protocols are computationally intensive and require periodic transmission of status information amongst all network nodes. Also, routing table volume swells with network size and can be large for dense networks. Therefore to cope with possibly rapidly changing topology reactive protocols such as dynamic source routing (DSR) generate routes for unknown destination paths on an as needs be basis. So as to avoid the continual demand for route discovery in DSR, network nodes record previously determined routes in either path or link caches. A route discovery attempt can possibly result in several paths being uncovered for a single destination. As nodes often have a finite capacity path cache, it may not be possible to store all paths. So as to influence productive caching decisions a fuzzy logic system is applied to the route discovery technique to curb non-optimal network floods. This action causes a cessation in the generation of low quality routes as only paths with good routing metrics are selected for the rebroadcast of route discovery packets. Consequently, route query packets arriving at the necessary destination node, or at some intermediate node with knowledge of the destination node, generate high quality route replies. This paper presents a fuzzy logic based decision algorithm that weighs individual links as a path to the necessary destination is being constructed if this link is deemed suitable by the fuzzy logic system it is added to the path and route construction continue. The fuzzy controller is used to instruct caching decisions and to optimise route selection as only good quality links are recorded in source destination paths.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"52 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134363400","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: 58
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