Proceedings of the 9th International Conference on Underwater Networks & Systems最新文献_第2页

Marine Observation Network based on Underwater Vehicles 基于水下航行器的海洋观测网

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2676779

S. Li, Jiancheng Yu, Yiping Li, Yu Tian

引用次数: 2

Cooperative Behaviours of AUV Teams and Networked Underwater Communication: How to Ask the Way and Not Go Astray AUV团队的合作行为与网络化水下通信:如何问路而不误入歧途

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2676778

A. Caiti

引用次数: 2

Busy Terminal Problem and Implications for MAC Protocols in Underwater Acoustic Networks 水声网络中繁忙终端问题及其对MAC协议的影响

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674593

Yibo Zhu, Jun-hong Cui, Zheng Peng, Zhong Zhou

{"title":"Busy Terminal Problem and Implications for MAC Protocols in Underwater Acoustic Networks","authors":"Yibo Zhu, Jun-hong Cui, Zheng Peng, Zhong Zhou","doi":"10.1145/2671490.2674593","DOIUrl":"https://doi.org/10.1145/2671490.2674593","url":null,"abstract":"In half-duplex underwater acoustic networks, MAC protocols usually assume packet transmissions can interrupt packet receptions so that the exposed terminal problem can be easily handled and system performance is improved. In practice, however, an acoustic modem cannot be interrupted at will when it is transmitting or receiving. In other words, the modem cannot transmit packets when it is busy. This problem is referred to as the \"busy terminal problem\". In underwater environments, the low transmission rates of acoustic modems result in excessive long transmission time which makes the busy terminal problem more severe. As a result, the modem frequently appears to be too busy to transmit newly arrived packets. This would significantly alter packet sending patterns, which may affect collision behaviors in underwater MAC protocols. To better study the busy terminal problem, we theoretically model its impact on successful transmission probability in multi-hop underwater acoustic networks with long propagation delays. Extensive simulations show that the proposed model can effectively characterize how the busy terminal problem affects collision behaviors.","PeriodicalId":308192,"journal":{"name":"Proceedings of the 9th International Conference on Underwater Networks & Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130474214","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: 8

Real-time Video Streaming from Mobile Underwater Sensors 实时视频流从移动水下传感器

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674582

Seongwon Han, Roy Chen, Youngtae Noh, M. Gerla

{"title":"Real-time Video Streaming from Mobile Underwater Sensors","authors":"Seongwon Han, Roy Chen, Youngtae Noh, M. Gerla","doi":"10.1145/2671490.2674582","DOIUrl":"https://doi.org/10.1145/2671490.2674582","url":null,"abstract":"Underwater sensor networking is generally regarded as an emerging technology to conduct oceanic exploration and research in an automated and effective manner. As underwater operations become more sophisticated, there is an increasing demand for real-time video streaming. However, real-time video streaming requires high bandwidth as well as low latency. Amongst the resources, bandwidth is the most critical limitation. To help overcome this obstacle, we propose a hybrid solution that combines acoustic and optical communications. Optics provides good quality real time video. Acoustic maintains a \"thin\" channel for network topology and transmission control, and for still frame video delivery when the optical channel fails. In particular, we enable optical communications by acoustic-assisted alignment and use acoustic communications as a back up when the optical signal is interrupted. The main contribution is to enable reliable, real-time video streaming without underwater optical cables. Another important contribution is the smooth transition between the acoustic and optical video delivery mode, using popular image processing algorithms to compress the video before transmitting it on the acoustic channel.","PeriodicalId":308192,"journal":{"name":"Proceedings of the 9th International Conference on Underwater Networks & Systems","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134014569","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: 29

A Framework of Acoustic Channel Availability Prediction for Avoiding Interfering Marine Mammals 一种避免海洋哺乳动物干扰的声道可用性预测框架

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674595

Wei Cheng, Yu Luo, Zheng Peng, M. Hastings

引用次数: 6

Design of A Software-defined Underwater Acoustic Modem with Real-time Physical Layer Adaptation Capabilities 具有实时物理层自适应能力的软件定义水声调制解调器设计

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674473

Emrecan Demirors, George Sklivanitis, G. Santagati, T. Melodia, S. Batalama

{"title":"Design of A Software-defined Underwater Acoustic Modem with Real-time Physical Layer Adaptation Capabilities","authors":"Emrecan Demirors, George Sklivanitis, G. Santagati, T. Melodia, S. Batalama","doi":"10.1145/2671490.2674473","DOIUrl":"https://doi.org/10.1145/2671490.2674473","url":null,"abstract":"This article describes the design of a custom software-defined modem with adaptive physical layer for underwater acoustic (UWA) communications. The modem consists of a commercial software-defined radio (SDR) interfaced with a wideband acoustic transducer through amplifying circuitry. With this custom-built platform, we focus on the unique physical layer challenges of the underwater acoustic channel to demonstrate the benefits of real-time adaptation in such rapidly varying environments. We first focus on an Orthogonal-Frequency-Division-Multiplexing (OFDM) transmission scheme. In particular, for the forward link, we consider and implement a high-data rate Zero-Padded OFDM (ZP--OFDM) physical layer with a superimposed convolutional error-correction coding scheme. ZP--OFDM offers high re-configurability in terms of number of OFDM subcarriers, modulation type (e.g., BPSK, QPSK), and error-correction coding rate. Real-time adaptation at the transmitter is achieved through a robust feedback link based on a binary chirp spread-spectrum modulation (B-CSS). We demonstrate that joint real-time adaptation of system parameters such as modulation constellation and channel coding rate leads to significant data rate increase under preset bit-error-rate (BER) constraints. Moreover, in the same context, we present for the first time a seamless switch of our SDR transmitter between different signaling technologies such as OFDM and direct-sequence spread-spectrum (DS-SS).","PeriodicalId":308192,"journal":{"name":"Proceedings of the 9th International Conference on Underwater Networks & Systems","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115017103","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: 43

M-ary Code Shift Keying Direct Sequence Spread Spectrum with Gold Sequence Using in Underwater Acoustic Communication 码移键控直接序列扩频金序列在水声通信中的应用

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674942

ZongXin Sun, Gang Qiao, Yang Yu

引用次数: 5

Distributed Beamforming for Underwater Sensor Networks 水下传感器网络的分布式波束形成

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674588

Yonggang Kim, Hyuk Lim

引用次数: 1

Efficient Heuristic Scheduling with Partial Queue and Channel State Information 基于部分队列和通道状态信息的高效启发式调度

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674592

B. Tomasi, J. Preisig

引用次数: 3

Localization of Mobile Nodes in an Underwater Distributed Antenna System 水下分布式天线系统中移动节点的定位

Proceedings of the 9th International Conference on Underwater Networks & Systems Pub Date : 2014-11-12 DOI: 10.1145/2671490.2674581

P. Carroll, Katherine Domrese, Hao Zhou, Shengli Zhou, P. Willett

引用次数: 9