2009 Second International Workshop on Cross Layer Design最新文献_第2页

Multicarrier systems with cross-layer adaptive frequency diversity 跨层自适应频率分集的多载波系统

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156511

F. Riera-Palou, G. Femenias

引用次数: 0

On the tradeoff between MAC-level performance metrics in MIMO ad hoc networks with imperfect channel estimation 信道估计不完全的MIMO自组织网络中mac级性能指标的权衡

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156522

P. Casari, Davide Chiarotto, M. Zorzi

{"title":"On the tradeoff between MAC-level performance metrics in MIMO ad hoc networks with imperfect channel estimation","authors":"P. Casari, Davide Chiarotto, M. Zorzi","doi":"10.1109/IWCLD.2009.5156522","DOIUrl":"https://doi.org/10.1109/IWCLD.2009.5156522","url":null,"abstract":"Classic approaches to channel estimation in MIMO ad hoc networks focus on the accuracy of the estimation techniques as applied to point-to-point links. However, when considering more complex networks, a number of further issues arise that have a significant impact on the performance of channel estimation. More specifically, ad hoc networks usually feature many simultaneous non-orthogonal communications whose impact on channel estimation as well as on higher layers of the protocol stack has not yet been thoroughly studied. In this paper we present some results on the effects of multiuser transmissions on channel state information accuracy in MIMO ad hoc networks, and evaluate the impact of imperfect channel estimation on the performance of MAC protocols. In particular, we consider a cross-layer MAC which accounts for the structure and behavior of the underlying PHY to make decisions on channel access; we then show the interplay between PHY parameters (such as the length of the training sequences used for channel estimation or the number of antennas) and MAClevel performance metrics such as throughput, efficiency, and success ratio. Our results show that relevant tradeoffs arise in this context and allow, e.g., to tune the MAC layer behavior by controlling the channel estimation accuracy.","PeriodicalId":357456,"journal":{"name":"2009 Second International Workshop on Cross Layer Design","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133799430","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

Cross-layer link adaptation for IEEE 802.11n IEEE 802.11n的跨层链路适配

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156524

Gabriel Martorell, F. Riera-Palou, G. Femenias

引用次数: 11

Application-aware H.264 Scalable Video Coding delivery over Wireless LAN: Experimental assessment 无线局域网中应用感知的H.264可扩展视频编码传输:实验评估

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156512

G. Bianchi, A. Detti, P. Loreti, Claudio Pisa, F. Proto, W. Kellerer, Srisakul Thakolsri, J. Widmer

{"title":"Application-aware H.264 Scalable Video Coding delivery over Wireless LAN: Experimental assessment","authors":"G. Bianchi, A. Detti, P. Loreti, Claudio Pisa, F. Proto, W. Kellerer, Srisakul Thakolsri, J. Widmer","doi":"10.1109/IWCLD.2009.5156512","DOIUrl":"https://doi.org/10.1109/IWCLD.2009.5156512","url":null,"abstract":"This paper is among the first works to document experimental results for application-aware H.264 Scalable Video Coding (SVC) support over Wireless LANs. Application-aware support is achieved by introducing a bandwidth throttling device, called Virtual BottleNeck (VBN), before the WLAN Access Point. Throttling is set to a bandwidth slightly smaller than the actual WLAN capacity (either known or estimated), so that all packet/frame losses occur inside the VBN. Here, loss events are controlled by a scheduling mechanism devised to operate with information taken from the H.264 Network Abstraction Layer Units (NALUs). Despite its relative simplicity, the implemented scheduler exhibits effective video adaptation performance and close to optimal bandwidth efficiency. Setting up the trial was not trivial due to the lack of suitable publicly available tools. We filled this gap by implementing and integrating several separate software modules, e.g., streaming server, NALU dependency filtering, video frame concealment, etc. As a final result, the experimental trial supports the full delivery chain for an SVC stream with the only limitation of an off-line stream conversion for play-out and Peak Signal-to-Noise Ratio (PSNR) measurement purposes, due to the unavailability of real time SVC players.","PeriodicalId":357456,"journal":{"name":"2009 Second International Workshop on Cross Layer Design","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114248094","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

Delay-constrained scheduling for interference-limited multi-carrier systems 限制干扰多载波系统的延迟约束调度

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156531

M. Wolkerstorfer, T. Nordstrom, D. Statovci

{"title":"Delay-constrained scheduling for interference-limited multi-carrier systems","authors":"M. Wolkerstorfer, T. Nordstrom, D. Statovci","doi":"10.1109/IWCLD.2009.5156531","DOIUrl":"https://doi.org/10.1109/IWCLD.2009.5156531","url":null,"abstract":"The reduction of energy consumption in digital subscriber line (DSL) networks has obtained considerable attention recently. Today's DSL is designed under an “always on” principle to keep the crosstalk noise as stable as possible. Departuring from this restriction, one approach to achieve energy savings is by “lazy scheduling” which exploits the tradeoff between energy-consumption and transmission delay inherent in many communication systems. This work extends the scope of this idea to multi-user interference limited systems employing multi-carrier modulation. Mathematical decomposition appears to be a natural approach for cross-layer optimization when the physical-layer spectrum management algorithm is already based on dual relaxation. We identify Benders decomposition as the appropriate choice of an optimization scheme for rate and delay constrained energy-minimization. Based on this we propose a cross-layer scheduler for multi-user/multi-carrier systems. By simulations of a single-hop, multi-user DSL scenario this scheduler is shown to closely approximate the optimal solution to this nonconvex problem. Furthermore, by example we demonstrate that scheduling for interference avoidance in DSL yields negligible additional performance gains over sole physical layer spectrum balancing in practice.","PeriodicalId":357456,"journal":{"name":"2009 Second International Workshop on Cross Layer Design","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129175059","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

Graph-based weighted sum throughput maximization in OFDMA cellular networks OFDMA蜂窝网络中基于图的加权和吞吐量最大化

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156509

M. Pischella, J. Belfiore

引用次数: 3

Cross-layer radio resource allocation: The journey so far and the road ahead 跨层无线电资源配置:前瞻之路

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156530

V. Corvino, L. Giupponi, Ana Perez Neira, V. Tralli, R. Verdone

{"title":"Cross-layer radio resource allocation: The journey so far and the road ahead","authors":"V. Corvino, L. Giupponi, Ana Perez Neira, V. Tralli, R. Verdone","doi":"10.1109/IWCLD.2009.5156530","DOIUrl":"https://doi.org/10.1109/IWCLD.2009.5156530","url":null,"abstract":"The cross-layer concept originated almost ten years ago with the aim of taking the most advantage from the difficult wireless media to break the barriers imposed by the layered transmission. One of the domains where cross-layer design has been more investigated is Radio Resource Allocation, since current and future networks need to provide wireless connectivity to heterogeneous users, offering many different data traffic types. Nonetheless, new paradigms are emerging in the field of wireless communications, like cognitive radios, wireless systems with relays and Multiple Input Multiple Output (MIMO) systems, where the potential advantages of cross-layer scheduling are still largely unknown. Moreover, in spite of a large literature on cross-layer, in the most cases different focuses and perspectives, biased by the application(s), are addressed, thus, there is lack of a general framework. The main goal of this paper is not to provide a state of the art on cross-layer scheduling and resource allocation, since this would result maybe in a heterogeneous list of scientific contributions. Rather, we are interested in performing a cataloguing of the work so far, trying to identify common tools and general frameworks used for cross-layer resource allocation, justify them by means of specific network examples and highlight open issues and challenges to be faced. Nevertheless, a preliminary objective of this work is to introduce a set of definitions which can be hopefully agreed by the scientific community.","PeriodicalId":357456,"journal":{"name":"2009 Second International Workshop on Cross Layer Design","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133379728","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

Hierarchical Wireless Sensor Networks with contention-based multiple-access schemes - A PHY/MAC cross-layer design 基于争用多址方案的分层无线传感器网络——一种PHY/MAC跨层设计

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156518

J. Matamoros, C. Antón-Haro

{"title":"Hierarchical Wireless Sensor Networks with contention-based multiple-access schemes - A PHY/MAC cross-layer design","authors":"J. Matamoros, C. Antón-Haro","doi":"10.1109/IWCLD.2009.5156518","DOIUrl":"https://doi.org/10.1109/IWCLD.2009.5156518","url":null,"abstract":"In this paper, we address the problem of decentralized parameter estimation with a Wireless Sensor Network (WSN). The network is hierarchical in that sensors are grouped into clusters, being each cluster under the supervision of a cluster-head (CH). The CH is also in charge of consolidating the sensor observations into a local estimate before its transmission to the Fusion Center (FC). In this context, we ask ourselves about the impact of the packet collisions associated with contention-based multiple-access schemes on the overall distortion in the estimates. To that extent, we derive an approximate yet asymptotically tight expression of the distortion resulting from the adoption of the ALOHA protocol. On that basis, we find a closed-form expression of the optimal time split for sensor-to-CH and CH-to-FC communications. Throughout the paper, we adopt a TDMA reservation-based (i.e. collision-free) multiple-access scheme as a benchmark. Numerical and computer simulation results reveal that the approximations are accurate along with a number of interesting design trade-offs associated with contention- and reservation-based schemes. The analysis is carried out from a cross-layer perspective in that the distortion in the estimates is a function of a number of systems parameters from the PHY (e.g. quantization noise) and MAC (e.g. probability of packet collision) layers of the OSI stack.","PeriodicalId":357456,"journal":{"name":"2009 Second International Workshop on Cross Layer Design","volume":"26 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131254611","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

A new cross-layer attack to TCP in cognitive radio networks 认知无线网络中对TCP的一种新的跨层攻击

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156526

Olga León, J. Hernández-Serrano, M. Soriano

引用次数: 39

Cross layer design of Application-level Resource Management interfaces 应用层资源管理接口的跨层设计

2009 Second International Workshop on Cross Layer Design Pub Date : 2009-06-11 DOI: 10.1109/IWCLD.2009.5156529

E. Pencheva, I. Atanasov, D. Marinska

引用次数: 3