water acoustic
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Photos: The building of a data centre
Photo The generators are screened by acoustic panelling to stop sound escaping into the surrounding area. The units use the water to cool air that has been warmed by the computers. Here are the under-floor pipes that carry chilled water around the data... [11 Jun 2008]
Design of Networking Protocols for Shallow Water Peer-to-Peer Acoustic Networks
White Paper Although point-to-point acoustic links can be established via numerous modulation schemes, an acoustic communication network demands multi-user communication. In such an environment, orthogonal modulation schemes could provide a solution for... [08 Jan 2008]
Photos: 'Top Gun course' for submarine hunters
Photo The Advanced Acoustic Analysis Course (AAAC) - commonly referred to as the "A" course - takes experienced sonar operators and aims to buff up their skills to enable them to make quick decisions when detecting and classifying underwater threats. [22 Aug 2007]
Performance of Coded OFDM in Very Shallow Water Channels and Snapping Shrimp Noise
White Paper Although acoustic energy has been used effectively for point-to-point communications in deepwater channels, it has had limited success for horizontal transmissions in shallow water. Time-varying multipath propagation and non-Gaussian snapping... [11 Apr 2007]
A Broadband Underwater Acoustic Modem Implementation Using Coherent OFDM
White Paper In the senior design project discussed in this paper, the authors have implemented an acoustic OFDM modem that transmits digital data through sound propagation. This paper demonstrates OFDM transmission first in air, and then in water. [11 Apr 2007]
Low Complexity OFDM Detector for Underwater Acoustic Channels
White Paper QPSK modulation with a varying number of carriers is used in a 24 kHz acoustic bandwidth. Algorithm performance is demonstrated on experimental data, transmitted through a shallow water channel over the distance of 2.5 km. [11 Apr 2007]
