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Wang D.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Hu X.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Xu F.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Chen H.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Wu Y.,Xiamen University
Program Book - OCEANS 2012 MTS/IEEE Yeosu: The Living Ocean and Coast - Diversity of Resources and Sustainable Activities | Year: 2012

In this paper, we investigate the performance of carrier sensing multiple access (CSMA)-based medium access control (MAC) protocol in fully connected underwater acoustic sensor networks (UWASNs). CSMA-based MAC protocols run inefficiently because of a new hidden terminal problem (we refer to it as long-delay hidden terminal problem). Based on our findings, this paper presents novel performance analysis model of physical CSMA (P-CSMA) for UWASNs. Compared with other analytical methods, the analysis model in this paper is closer to the actual network, in which the number of nodes is finite and propagation delays among certain nodes are variable. The close form expressions for throughput and packet loss ratio indicate that CSMA-based MAC protocols are influenced greatly by long-delay hidden terminal problem. Simulation results show the correctness of the analysis model. © 2012 IEEE. Source


Jiang Y.,Xiamen University | Chen L.,Xiamen University | Wang W.,Xiamen University | Ding X.,Xiamen University | And 3 more authors.
2014 IEEE International Conference on Image Processing, ICIP 2014 | Year: 2014

Pan-sharpening is an approach that fuse low resolution multi-spectral (LRMS) images with a high spatial detail of panchromatic (PAN) image to obtain the high resolution multispectral (HRMS) images. In this paper, we present a compressed sensing-based pan-sharpening method that include joint data fidelity and blind blurring kernel estimation. The joint data fidelity contain following three fidelity terms: (1) the LRMS images could be the decimated form of the HRMS images by convolving a blurring kernel, (2) the gradient of HRMS images in the spectrum direction could be proximity to those of the LRMS images, (3) the high frequency part of linear combination of HRMS image bands is approximate to the corresponding parts of the PAN image. Different from other methods which simply apply average blurring kernel for pan-sharpening, a blind deconvolution algorithm is introduced to estimate the blurring kernel from different satellites respectively. We also include a novel anisotropic total variation (TV) prior term to better reconstruct the image edges. The alternating direction method of multipliers (ADMM) is used to solve the proposed model efficiently. Finally, a Pléiades satellite image is employed to demonstrate that the proposed method achieve effective and efficient results simultaneously compared with other existing methods. © 2014 IEEE. Source


Cheng E.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Xu X.-N.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Wu S.-L.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Bluetooth is one of the wireless communication technology, which is developing rapidly in recent years. As a result of low cost and short distance, Bluetooth can set up a special connection for portable electronic devices and stationary electronic equipment communication environment. The paper studies a data acquisition system based on Bluetooth. The system can collect the angle of motor rotation and send it to the Receiver through the Bluetooth. The results show that the system can be run normal.[1]. © 2013 SPIE. Source


Hai-Yan L.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Fei Y.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | En C.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology
Proceedings of the 2013 IEEE 8th Conference on Industrial Electronics and Applications, ICIEA 2013 | Year: 2013

Underwater acoustic communication technology is an effective mean of development and study of the sea. It is widely used in marine environment three-dimensional monitoring, underwater multimedia communication, underwater mobile carrier navigation and positioning, marine resources detection, remote control of submarine topography mapping and offshore oil industry, data acquisition, etc. The sea buoy is an important part of underwater acoustic communication system. It is of great significance to track and locate it. This paper describes the application of the monitoring service of GPRS / GPS module at sea buoy. It can achieve real-time location of underwater acoustic communication devices and route tracking to avoid the loss of the device, as well as assist to retrieve the lost device. © 2013 IEEE. Source


Fu X.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Fu X.,Xiamen University | Zeng D.,Key Laboratory of Underwater Acoustic Communication and Marine Information Technology | Zeng D.,Xiamen University | And 7 more authors.
2013 IEEE Global Conference on Signal and Information Processing, GlobalSIP 2013 - Proceedings | Year: 2013

Low light image enhancement is prerequisite in many fields, such as surveillance systems, road safety and waterway transport. In this paper, a new variational framework using bright channel prior is proposed to address the low light image enhancement problem within a single image. An alternating direction optimization method is employed to solve the variational problem. Experiment results show that the new method can better eliminate the black halo and suppressing the issues of over-enhancement and color distortion when compared with other existing methods. © 2013 IEEE. Source

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