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Performance and TCP-fairness of TFRC in an 802.11g WLAN: experiments and tuning 802.11g无线局域网中TFRC的性能和tcp -公平性:实验和调优
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407270
M. Borri, M. Casoni, M. L. Merani
{"title":"Performance and TCP-fairness of TFRC in an 802.11g WLAN: experiments and tuning","authors":"M. Borri, M. Casoni, M. L. Merani","doi":"10.1109/ISWCS.2004.1407270","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407270","url":null,"abstract":"In this paper we discuss some experimental results obtained from a laboratory testing of TCP-friendly rate control (TFRC), when such control is employed in an IEEE 802.11g wireless local area network (WLAN). We show that, despite TFRC exhibiting a good responsive behavior and a considerable TCP-friendliness in a wired environment, occasionally it does not behave in the same manner in the wireless test-bed. We discuss the possible reasons of such unexpected behavior, and propose a tuning of some of its congestion indicators, as well as a simple enhancement of the control, in order to get rid of the undesirable effects we observed. In detail, our proposal consists of an additional mechanism for flow control, similar to the one TCP employs, of a more tightly computed no feedback timer, and of a parameter that rules the way TFRC backs-off when it detects a loss event. We pleasantly notice that our modifications and tuning result quite effective for two reasons: first, they completely succeed at eliminating the aggressive behavior sometimes exhibited by TFRC; second, they do not affect the good performance, nor the TCP-friendly behavior of TFRC in those circumstances where the native control already performs satisfyingly.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"60 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":"134452962","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
User profiling technique in multibearer radio mobile networks 多载波无线移动网络中的用户剖析技术
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407282
G. Araniti, A. Iera, A. Molinaro, S. Pulitanò
{"title":"User profiling technique in multibearer radio mobile networks","authors":"G. Araniti, A. Iera, A. Molinaro, S. Pulitanò","doi":"10.1109/ISWCS.2004.1407282","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407282","url":null,"abstract":"In this paper a dynamic QoS management technique for an enhanced UMTS environment is proposed. It aims at continuously matching user preferences and resource constraints imposed by the mobile environment. A point of strength of the proposed mechanism is represented by the user profiling procedure adopted. It foresees that the user has associated a set of preferences and requests which are automatically taken into account by the resource allocation and negotiation algorithm. This allows to contemporary maintain a high level of user satisfaction, and contemporary, to reduce the network signalling load.","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":"124679045","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 space-time trellis code detection and MIMO equalisation via particle filtering 联合空时格码检测与粒子滤波MIMO均衡
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407269
R. Piechocki, C. Andrieu, C. Vithanage, Joe McGeehan
{"title":"Joint space-time trellis code detection and MIMO equalisation via particle filtering","authors":"R. Piechocki, C. Andrieu, C. Vithanage, Joe McGeehan","doi":"10.1109/ISWCS.2004.1407269","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407269","url":null,"abstract":"In this contribution we address the problem of MIMO equalisation and transmit diversity. More specifically, we develop a method that jointly decodes space time trellis coded modulation (STTCM) encoded signals and equalises the MIMO channels. The optimal solution for such a setup would require construction of a super-trellis that describes a finite state machine resulting from the combination of MIMO channel and STTCM trellises. However, the number of states in this super-trellis is typically gigantic and as such prohibits practical application. Our solution is based on sequential Monte Carlo technique (aka particle filter), which has gained much interest recently in the communications community. The structure of the STTCM code is incorporated into the proposal distribution of the particle filter. As a results a significant reduction in complexity has been achieved as compared not only to the brute force super-trellis approach, but also when compared to the conventional \"turbo\" solution.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"8 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":"129767259","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
Differential space-time codes with four transmit antennas 四个发射天线的差分空时编码
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407266
T. Konishi
{"title":"Differential space-time codes with four transmit antennas","authors":"T. Konishi","doi":"10.1109/ISWCS.2004.1407266","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407266","url":null,"abstract":"We give near optimal differential unitary space-time codes using Bruhat decomposition and Weyl group for four transmit antennas. In case of two transmit antennas, it has been assumed that the two channels are uncorrelated. However, for four transmit antennas, the assumption is no longer justified. Therefore the new codes are found by examination of the average of the minimum squared Euclidean distance between all of the unitary matrices multiplied by various fading coefficients. The performance of the codes are simulated by computer and compared with the well-known cyclic group codes. The near optimal codes are about 2 dB better than the cyclic codes.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"36 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":"133520304","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 impact of phase noise and frequency offsets in block transmission CDMA schemes 分块传输CDMA方案中相位噪声和频率偏移的影响
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407216
R. Dinis, C. Lam, D. Falconer
{"title":"On the impact of phase noise and frequency offsets in block transmission CDMA schemes","authors":"R. Dinis, C. Lam, D. Falconer","doi":"10.1109/ISWCS.2004.1407216","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407216","url":null,"abstract":"Block transmission techniques, with appropriate cyclic extension and employing FDE techniques (frequency-domain equalization), are appropriate for high data rate transmission over severe time-dispersive channels. However, these techniques may require accurate carrier synchronization and very stable oscillators, especially when employed in the uplink transmission of CDMA-based systems (code division multiple access) with large blocks. In this paper, we study the impact of phase noise and frequency offsets on the uplink of CDMA-based block transmission systems.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"26 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":"133380224","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: 7
Space-time block coding based MIMO array receiver 基于空时分组编码的MIMO阵列接收机
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407268
J. Ng, Tingting Zhang, A. Manikas
{"title":"Space-time block coding based MIMO array receiver","authors":"J. Ng, Tingting Zhang, A. Manikas","doi":"10.1109/ISWCS.2004.1407268","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407268","url":null,"abstract":"In this paper, a blind near-far resistant MIMO array receiver incorporated with either space-time transmit diversity (STTD) or space-time spreading (STS) schemes is proposed for time-varying multipath DS-CDMA systems, Many reported research works on MIMO, including the conventional STTD and STS schemes, often assume that the channel is flat fading and is known. However, the MIMO array receiver proposed in this study is based on a subspace-type joint space-time estimation algorithm, which does not need any power control or channel information. Furthermore, it is robust to channel estimation errors in the event of any unidentified or erroneous channel parameter. The effectiveness of the proposed approach is supported by representative examples and computer simulation studies.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"6 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":"128699924","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
Unequal error protection schemes for image transmission over fading channels 衰落信道上图像传输的不等错误保护方案
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407238
M. Caldera, Hans-Jürgen Zepernick, I. Holland, Chun-Zen Pui, S. V. D. Werf
{"title":"Unequal error protection schemes for image transmission over fading channels","authors":"M. Caldera, Hans-Jürgen Zepernick, I. Holland, Chun-Zen Pui, S. V. D. Werf","doi":"10.1109/ISWCS.2004.1407238","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407238","url":null,"abstract":"In this paper, an unequal error protection (UEP) scheme is investigated for highly error sensitive joint photographic experts group (JPEG) images transmitted over uncorrelated flat Rayleigh fading channels. The powerful source compression involved with JPEG often leads to increased error susceptibility. In particular, corruption of the file headers may result in a transmitted file unreadable to the target application. To alleviate this problem, additional error protection may be provided for critical data segments, such as headers and control markers, whilst less error protection may be allocated to payload data. This may be accomplished by the proposed UEP scheme, which uses a powerful extended Golay code for the critical bits, and an extended Hamming code, having reduced decoding complexity and storage space requirements, for the less important payload bits. Simulation results obtained using symbol-by-symbol maximum a posteriori probability (MAP) decoding demonstrate that the proposed UEP scheme displays significant performance improvement compared to the traditional equal error protection (EEP) scheme, in terms of the percentage of readable files.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"32 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":"115412148","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
A fast design model for indoor radio coverage in the 2.4 GHz wireless LAN 2.4 GHz无线局域网室内无线电覆盖的快速设计模型
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407279
Jaime Lloret, José J. López, C. Turró, S. Flores
{"title":"A fast design model for indoor radio coverage in the 2.4 GHz wireless LAN","authors":"Jaime Lloret, José J. López, C. Turró, S. Flores","doi":"10.1109/ISWCS.2004.1407279","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407279","url":null,"abstract":"In this paper, an empiric radio coverage model for indoor wireless LAN is presented. This model has been tried out in a vast series of large extension buildings obtaining successful results. The objective of the model is to facilitate the radio design work of a wireless LAN by means of straightforward calculations, because the use of statistical methods is very time consuming, and difficult to put in practice at most situations. Our model is based on a derivation of the free field propagation equation taking into account the building structure and its materials and it has been tested on a large scale design of a WLAN network of over 400 access points. Finally, the paper includes the guidelines to setup a home, building, university campus, or city wireless LAN easily in three simple steps.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"95 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":"125280096","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: 48
Performance evaluation of on-demand multipath distance vector routing protocol over two MAC layers in mobile ad hoc networks 移动自组网中两MAC层按需多径距离矢量路由协议的性能评价
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407280
V. Loscrí, F. Rango, S. Marano
{"title":"Performance evaluation of on-demand multipath distance vector routing protocol over two MAC layers in mobile ad hoc networks","authors":"V. Loscrí, F. Rango, S. Marano","doi":"10.1109/ISWCS.2004.1407280","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407280","url":null,"abstract":"A mobile ad hoc network is a network of mobile nodes connected by multi-hop wireless links without centralized infrastructure support. The area of ad hoc networking is receiving increasing attention in recent years. Efficient dynamic routing is an important research challenge in such a network. In recent years, routing has been the most focused area in ad hoc networks research. On-demand routing, in particular, is widely developed in bandwidth constrained mobile wireless ad hoc networks because of its effectiveness and efficiency. A variety of new multipath routing protocols targeted at the ad hoc networking environment have been proposed. Multipath routing improves the throughput of ad hoc networks; it is a straightforward mechanism to recover from route losses in a dynamic network. In this paper we have considered a very well-known multipath routing protocol called ad hoc on-demand multipath distance vector routing (AOMDV) on both MAC layers, the standard IEEE 802.11 and a TDMA MAC protocol called evolutionary-TDMA (E-TDMA). We have evaluated the performance of these multipath routing through simulations using NS2 varying the number of paths (particularly we have considered 2 and 3 paths) and varying the number of temporary colors.","PeriodicalId":122977,"journal":{"name":"1st International Symposium onWireless Communication Systems, 2004.","volume":"29 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":"126769041","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: 13
Location privacy and the personal distributed environment 位置隐私和个人分布式环境
1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI: 10.1109/ISWCS.2004.1407248
R. Atkinson, S. K. Goo, J. Irvine, J. Dunlop
{"title":"Location privacy and the personal distributed environment","authors":"R. Atkinson, S. K. Goo, J. Irvine, J. Dunlop","doi":"10.1109/ISWCS.2004.1407248","DOIUrl":"https://doi.org/10.1109/ISWCS.2004.1407248","url":null,"abstract":"The personal distributed environment is a new concept being developed within the mobile VCE core 3 research programme whereby users have access to their services and data through a distributed set of terminals, wherever their location: ubiquitous access. Devices are co-ordinated by device management entities (DMEs), which are either Local DMEs, controlling devices within a single PDE subnetwork at a user's home or office. For example, or an overall root DME providing universal co-ordination and a single point of contact. While such a structure allows very flexible service delivery, it has serious security concerns, as the presence of signalling between root and local DMEs will allow the location of the user to be determined at all times. In this paper, we analyse the security threats to the DME structure proposed for the PDE, and introduce a system of tunnelling and mix networks to provide security and privacy.","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":"124822875","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
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