Proceedings of the 5th International Workshop on Underwater Networks最新文献

Wavelet compression with set partitioning for low bandwidth telemetry from AUVs 基于小波压缩的水下机器人低带宽遥测

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868813

Chris Murphy, Hanumant Singh

{"title":"Wavelet compression with set partitioning for low bandwidth telemetry from AUVs","authors":"Chris Murphy, Hanumant Singh","doi":"10.1145/1868812.1868813","DOIUrl":"https://doi.org/10.1145/1868812.1868813","url":null,"abstract":"Autonomous underwater vehicles (AUVs) typically communicate with scientists on the surface over an unreliable wireless channel. The challenges of underwater acoustic communication result in very low data throughput. While there are several examples of scientific data, even imagery, being successfully transmitted over high rate acoustic links, channel coding methods with high rates of error-correction are often employed that limit data throughput to tens or a few hundred bits per second. Little research exists into appropriate methods for image and data compression for acoustic links at these very low rates. We recently have experienced great success using compression techniques based upon the Set Partitioning in Hierarchical Trees (SPIHT) embedded coding method, and feel they are particularly suited to underwater data in a number of ways. In particular, SPIHT provides a fully embedded coding method; truncating the encoded bitstream at any point produces the optimal encoding for that data length. This allows fine-resolution imagery to build on previously transmitted low-resolution thumbnails. For time-series data, we have developed a method for quantizing data to emphasize more important sections, such as the most recently collected data. In this paper we describe how these methods can be applied to compress scalar environmental data and imagery for communication over acoustic links. We also the present initial results of sea trials performed near Rota in the Commonwealth of Northern Marianas Islands, during which images were captured, compressed and transmitted in-situ.","PeriodicalId":223476,"journal":{"name":"Proceedings of the 5th International Workshop on Underwater Networks","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126544706","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

Distributed localization in cluttered underwater environments 杂乱水下环境中的分布式定位

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868820

M. Hussain, A. Trigoni

引用次数: 27

Antennas for mussel-based underwater biological sensor networks in rivers 河流中以贻贝为基础的水下生物传感器网络天线

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868825

Kenneth P. Hunt, J. Niemeier, A. Kruger

{"title":"Antennas for mussel-based underwater biological sensor networks in rivers","authors":"Kenneth P. Hunt, J. Niemeier, A. Kruger","doi":"10.1145/1868812.1868825","DOIUrl":"https://doi.org/10.1145/1868812.1868825","url":null,"abstract":"Researchers are working on using freshwater mussels as biological sensors. A sensor placed on the mussel detects the mussel's rhythmic opening and closing, or gape. Changes in the gape can indicate changes in the mussel's environment. We plan to attach gape sensors, microcontrollers, and radios to mussels and place them back in their natural environment. Small, inexpensive radios operating in the Industrial, Scientific and Medical (ISM) bands will provide the physical link of an underwater wireless sensor network (WSN). Despite the attenuation radio waves experience in water, the low cost of these radios should allow us to deploy enough to set up a reliable communications network. While commercially available radios can be used underwater with waterproofing, antennas designed for use in air are unsuitable for use in water, because of the different electromagnetic properties of water and air. We designed dipole, loop, and folded dipole antennas for use in water and attached these to transmitters. We measured the power transmitted by the antennas by immersing the transmitters in a tank of water and measuring the received power at different distances using a small dipole antenna attached to a spectrum analyzer. The distance between the antennas was precisely controlled with a motorized xy positioner.","PeriodicalId":223476,"journal":{"name":"Proceedings of the 5th International Workshop on Underwater Networks","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127831536","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: 12

OFDM in deep water acoustic channels with extremely long delay spread 具有超长延迟传播的深水水声信道OFDM

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868828

Zhaohui Wang, Shengli Zhou, J. Catipovic, Jie Huang

引用次数: 7

Hierarchical underwater acoustic sensor networks 分层水声传感器网络

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868822

A. Stefanov, M. Stojanovic

{"title":"Hierarchical underwater acoustic sensor networks","authors":"A. Stefanov, M. Stojanovic","doi":"10.1145/1868812.1868822","DOIUrl":"https://doi.org/10.1145/1868812.1868822","url":null,"abstract":"We propose a hierarchical underwater acoustic sensor network architecture in which the sensors and the collector stations operate in distinct layers. The hierarchical architecture is motivated by the property of the acoustic underwater transmission medium that for each transmission distance there exists an operating frequency for which the narrowband signal-to-noise ratio is maximized. The sensors and collector stations are consequently allocated different operating frequencies. We assume a uniform distribution of both sensors and collector stations over the finite area of the sensing field. The node-to-node channel is modeled using frequency dependent path loss and Ricean fading. We adopt a communication theoretic approach and study the interdependence of the sustainable number of hops through the network, end-to-end frame error probability, power and bandwidth allocation. The analysis is performed under the assumption that there is interference from other nodes within the same layer of the hierarchy. We present numerical examples that illustrate the network performance and demonstrate that there are preferred operating frequencies which ensure network operation without any cross-interference between the collector network and the sensor network.","PeriodicalId":223476,"journal":{"name":"Proceedings of the 5th International Workshop on Underwater Networks","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131909497","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

R&D of a dual mode acoustic modem testbed for shallow water channels 浅水通道双模声调制解调器试验台的研制

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868827

F. Tong, S. Zhou, Bridget Benson, R. Kastner

引用次数: 3

System capacity of CDMA, TDMA and FDMA in cluster type underwater acoustic networks 集群型水声网络中CDMA、TDMA和FDMA的系统容量

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868831

Zaihan Jiang, T. C. Yang

引用次数: 1

A study of incremental redundancy hybrid ARQ over Markov channel models derived from experimental data 基于实验数据的马尔可夫信道模型的增量冗余混合ARQ研究

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868816

B. Tomasi, P. Casari, L. Badia, M. Zorzi

{"title":"A study of incremental redundancy hybrid ARQ over Markov channel models derived from experimental data","authors":"B. Tomasi, P. Casari, L. Badia, M. Zorzi","doi":"10.1145/1868812.1868816","DOIUrl":"https://doi.org/10.1145/1868812.1868816","url":null,"abstract":"In this paper, we process channel Signal-to-Noise-Ratio time series gathered in the proximity of the Pianosa island, Italy, in Summer 2009. These traces are used to model the performance of capacity-achieving code ensembles as employed in an Incremental Redundancy (IR) Hybrid Automatic Repeat reQuest (HARQ) error control scheme. We apply a code-matched channel state quantization technique aimed at representing channel evolution over time with low quantization error; the evolution of the channel among the quantized states is then represented using a Markov model, over which we base the analytical evaluation of IR-HARQ performance. Results confirm that IR-HARQ consistently improves link performance with respect to Type I HARQ. In addition, we observe that the different channel statistics due to different transmitter and receiver placements, as well as to the acoustic propagation conditions considered in our scenario, have an impact on HARQ performance. This impact is correctly captured by our Markov model, suggesting good adherence of the model to actual channel behaviors. The validation of the models (by simulating over different traces than those used to train the models) suggests that they are robust to moderate non-stationarity, making them good candidates to give a compact representation of the channel behavior, e.g., in network simulators.","PeriodicalId":223476,"journal":{"name":"Proceedings of the 5th International Workshop on Underwater Networks","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133216297","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

On the effects of deployment imprecision on underwater sensor connectivity 部署不精度对水下传感器连通性的影响

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868829

E. Golen, S. Mishra, N. Shenoy

引用次数: 2

Data detection techniques for OFDM signals over Doppler-distorted channels 多普勒失真信道上OFDM信号的数据检测技术

Proceedings of the 5th International Workshop on Underwater Networks Pub Date : 2010-09-30 DOI: 10.1145/1868812.1868823

S. Yerramalli, M. Stojanovic, U. Mitra

引用次数: 3