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Proceedings of the 2nd Workshop on Underwater Networks最新文献

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Efficient communication over highly spread underwater acoustic channels 通过高度传播的水声信道进行高效通信
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287817
S. Hwang, Philip Schniter
{"title":"Efficient communication over highly spread underwater acoustic channels","authors":"S. Hwang, Philip Schniter","doi":"10.1145/1287812.1287817","DOIUrl":"https://doi.org/10.1145/1287812.1287817","url":null,"abstract":"In this paper we propose a novel method for communication over underwater acoustic channels for which the product of delay-spread and Doppler-spread is large, such as those pertaining to the surf zone. In particular, we propose the use of pulse-shaped multicarrier modulation to convert the doubly dispersive channel into an inter-carrier interference (ICI) channel with small ICI spread. We then propose a novel joint ICI-estimation/data-detection strategy which performs near optimally yet at low complexity, due to the use of an efficient tree search algorithm and the ability to leverage sparseness in the delay-power profile. The delay-power profile, which itself varies in time, can be readily tracked via pilots. Numerical simulations show that our technique gives performance close to genie-aided bounds over highly spread channels.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"12 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123659825","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: 36
A hybrid medium access control protocol for underwater wireless networks 水下无线网络的混合介质访问控制协议
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287821
Kurtis B. Kredo, P. Mohapatra
{"title":"A hybrid medium access control protocol for underwater wireless networks","authors":"Kurtis B. Kredo, P. Mohapatra","doi":"10.1145/1287812.1287821","DOIUrl":"https://doi.org/10.1145/1287812.1287821","url":null,"abstract":"Underwater networks allow investigation of many areas of the world not easily accessed by humans, but offer interesting challenges to device and protocol designers due to the unique channel conditions present when using acoustic communications. The high transmit power of acoustic transceivers makes the medium access protocol a primary focus point for reducing energy consumption in energy limited underwater devices. Scheduled protocols use very little power by eliminating collisions, but cannot adapt to changing traffic conditions in the same way as random protocols. We attempt to bridge these two ideas by dividing time into scheduled and unscheduled access periods in order to yield the benefits of each protocol. We show that this technique increases the bits delivered per energy unit in many cases of interest. Additionally, the hybrid technique provides low latency for a wider range of traffic rates than either of the two protocols when considered individually. We also investigate some of the design tradeoffs to consider when using a hybrid protocol.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127912273","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: 87
Folding: a method for semantic encoding of error-tolerant data 折叠:一种容错数据的语义编码方法
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287829
V. Rodoplu, B. Srinivasan
{"title":"Folding: a method for semantic encoding of error-tolerant data","authors":"V. Rodoplu, B. Srinivasan","doi":"10.1145/1287812.1287829","DOIUrl":"https://doi.org/10.1145/1287812.1287829","url":null,"abstract":"Underwater acoustic sensor networks are characterized by both low link data rates, and very low data generation rates of the sensors. In this regime, Shannon capacity results, which presume long channel codes and an infinitely long information bitstream, are not directly applicable. Further, for scientific data collection, distortion and errors are tolerable at the semantic layer. For this regime, we formulate the problem of sending k successive source symbols using n successive modulation intervals, where n > k. We introduce \"folding\" as a technique to map a k-dimensional source manifold into the n-dimensional modulation space, in order to minimize the average energy consumption per source symbol. We use an Archimedes' spiral, ahelix, and Fermat's spiral, as good foldings for low-dimensional mappings, and compute the energy consumption per source symbol under each.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134189031","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
Localization with Dive'N'Rise (DNR) beacons for underwater acoustic sensor networks 基于潜升(DNR)信标的水声传感器网络定位
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287833
M. Erol-Kantarci, L. Vieira, M. Gerla
{"title":"Localization with Dive'N'Rise (DNR) beacons for underwater acoustic sensor networks","authors":"M. Erol-Kantarci, L. Vieira, M. Gerla","doi":"10.1145/1287812.1287833","DOIUrl":"https://doi.org/10.1145/1287812.1287833","url":null,"abstract":"In this paper, we address the localization issue in Underwater Sensor Networks (UWSNs). We propose Dive'N'Rise(DNR) Positioning, the novel idea of using DNR beacons for localization. These beacons get their coordinates from GPS while floating above the water, then they dive into water. While sinking and rising, they broadcast their positions. Sensor nodes are localized by passively listening to DNR beacon messages which reduces the communication cost and the energy consumption. We analyze localization success and error for static and mobile UWSNs.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115821968","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: 210
Network coding schemes for underwater networks: the benefits of implicit acknowledgement 水下网络的网络编码方案:隐式确认的好处
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287819
D. Lucani, M. Médard, M. Stojanovic
{"title":"Network coding schemes for underwater networks: the benefits of implicit acknowledgement","authors":"D. Lucani, M. Médard, M. Stojanovic","doi":"10.1145/1287812.1287819","DOIUrl":"https://doi.org/10.1145/1287812.1287819","url":null,"abstract":"Underwater acoustic communications are characterized by a long propagation delay and limited bandwidth. Power consumption is an additional constraint for underwater networks. Network layer schemes for that minimize both transmission time and power consumption are thus of interest. Conventional routing schemes have limitations in both power consumption and delay performance. Application of network coding schemes in rateless fashion results in better delay performance; however, power consumption is greater than for most routing schemes when the network is lightly loaded. This paper proposes a new method for network coding that relies on implicit acknowledgements to improve power consumption performance. Numerical results demonstrate superior performance of the scheme proposed. The method is also applicable to other wireless channels.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133744777","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: 52
Energy-efficient localization in networks of underwater drifters 水下漂船网络的节能定位
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287827
Diba Mirza, C. Schurgers
{"title":"Energy-efficient localization in networks of underwater drifters","authors":"Diba Mirza, C. Schurgers","doi":"10.1145/1287812.1287827","DOIUrl":"https://doi.org/10.1145/1287812.1287827","url":null,"abstract":"In their quest to study the intricate underwater ecosystems, oceanographic scientists need spatially-rich data that is collected within the moving reference frame created by the oceans' currents. To this end, we are developing a system of networked underwater ocean explorers that drift freely with the currents. However, effective interpretation of collected sensor data hinges on knowing the positions of these drifters while submerged. Due to their uncontrollable motion, positions have to be tracked in time. Unlike in static networks, position estimation therefore represents a recurring cost, which should be minimized for reasons of limited on-board energy supplies. In this paper, we present a low-overhead scheme that is able to trade accuracy for energy savings by cleverly selecting the specific links that are required for the self-localization algorithm. Our technique is also agile enough to quickly adapt to on-demand changes in accuracy requirements, and cuts the position estimation costs by 40% or more under various ocean current dynamics.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131260963","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
An underwater network testbed: design, implementation and measurement 水下网络试验台:设计、实现与测量
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287826
J. Zheng, Jun-hong Cui, B. Wang, K. Ball, L. Freitag
{"title":"An underwater network testbed: design, implementation and measurement","authors":"J. Zheng, Jun-hong Cui, B. Wang, K. Ball, L. Freitag","doi":"10.1145/1287812.1287826","DOIUrl":"https://doi.org/10.1145/1287812.1287826","url":null,"abstract":"This paper presents the design, implementation and measurement of Aqua-Lab, an underwater acoustic sensor network lab testbed. Aqua-Lab consists of a water tank, a set of acoustic communication hardware, and a set of software. One important component of the software is an emulator that we developed to provide user-friendly programming interfaces and emulate realistic network settings. Using Aqua-Lab, we explore basic characteristics of data transmission using Micro-Modems and conduct a set of experiments in both field and lab environments. Our results from lab testbed are consistent with those from the field experiments, and thus demonstrate that Aqua-Lab can be used to experimentally evaluate algorithms and protocols designed for underwater sensor networks.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127656640","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: 44
AquaNodes: an underwater sensor network aquanode:一个水下传感器网络
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287830
I. Vasilescu, Carrick Detweiler, D. Rus
{"title":"AquaNodes: an underwater sensor network","authors":"I. Vasilescu, Carrick Detweiler, D. Rus","doi":"10.1145/1287812.1287830","DOIUrl":"https://doi.org/10.1145/1287812.1287830","url":null,"abstract":"This paper describes an underwater sensor network with dual communication and support for sensing and mobility. The nodes in the system are connected acoustically for broadcast communication using an acoustic modem we developed. For higher point to point communication speed the nodes are networked optically using custom built optical modems. We describe the hardware details of the underwater sensor node and the communication and networking protocols. Finally, we present and discuss the results from experiments with this system.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129059883","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: 101
MIMO time reversal communications MIMO时间反转通信
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287816
Hee-Chun Song, W. Hodgkiss, W. Kuperman
{"title":"MIMO time reversal communications","authors":"Hee-Chun Song, W. Hodgkiss, W. Kuperman","doi":"10.1145/1287812.1287816","DOIUrl":"https://doi.org/10.1145/1287812.1287816","url":null,"abstract":"A time reversal mirror (TRM) exploits spatial diversity to achieve spatial and temporal focusing, a useful property for communications in an environment with significant multipath. Temporal focusing (pulse compression) mitigates intersymbol interference (ISI) while spatial focusing enables a straightforward extension to multiple-input/multiple-output (MIMO) communications. Furthermore, the time reversal process can be combined with adaptive channel equalization to remove the residual ISI and compensate for the channel variations, providing nearly optimal performance. At-sea experimental results for MIMO multi-access/multi-user communications demonstrate the effectiveness of time reversal communications in underwater acoustic channels.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127947656","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: 18
A delay-reliability analysis for multihop underwater acoustic communication 多跳水声通信时延可靠性分析
Proceedings of the 2nd Workshop on Underwater Networks Pub Date : 2007-09-14 DOI: 10.1145/1287812.1287825
Wenyi Zhang, U. Mitra
{"title":"A delay-reliability analysis for multihop underwater acoustic communication","authors":"Wenyi Zhang, U. Mitra","doi":"10.1145/1287812.1287825","DOIUrl":"https://doi.org/10.1145/1287812.1287825","url":null,"abstract":"This paper investigates the delay-reliability tradeoff for multihop underwater acoustic networks. The propagation med-ium of underwater acoustic channel exhibits distinct characteristics when contrasted with other common propagation media such as copper, fiber, and radio. In particular there are the extremely slow propagation speed of sound in water, high signal attenuation due to absorption, significant delay spreads and intersymbol interference, and range-dependent transmission bandwidth. These features make the delay-reliability tradeoff for underwater acoustic channels fundamentally different from other channels. The approach is based on error-exponents which enable a physical-layer comparison of multihopping versus no hops while considering the overall throughput. The analysis shows that for typical network parameters, increasing the number of hops dramatically improves both the achievable information rate and the achievable reliability function, which quantitatively captures the decay rate of the decoding error probability as the coding block length increases asymptotically. Numerical results are presented to illustrate the analysis.","PeriodicalId":191370,"journal":{"name":"Proceedings of the 2nd Workshop on Underwater Networks","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128272755","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: 33
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