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Topics Tagged ‘IEEE Topic’

Shallow Water Acoustic Networks

Added on: March 18th, 2012 by No Comments

Shallow water acoustic network s are generally formed by acoustically connected ocean bottom sensor nodes, autonomous underwater vehicles (AUVs), and surface stations that serve as gateways and provide radio communication link s to on -shore stations. The QoS of such network s is limited by the low bandwidth of acoustic transmission channels, high latency resulting from the slow propagation of sound, and elevated noise levels in some environments. The long -term goal in the design of underwater acoustic network s is to provide for a self- configuring network of distributed nodes with network link s that automatically adapt to the environment through selection of the optimum system parameters. Here considers several aspects in the design of shallow water acoustic network s that maximize throughput and reliability while minimizing power consumption And In the last two decades, underwater acoustic communications has experienced significant progress. The traditional approach for ocean -bottom or ocean-column monitoring is to deploy oceanographic sensors, record the data, and recover the instruments. But this approach failed in real -time monitoring. The ideal solution for real -time monitoring of selected ocean areas for long periods of time is to connect various instruments through wireless link s within a network structure. And the Basic underwater acoustic network s are formed by establishing bidirectional acoustic communication between nodes such as autonomous underwater vehicles (AUVs) and fixed sensors. The network is then connected to a surface station, which can further be connected to terrestrial networks such as the Internet.

Under water sensor network, acoustic network, acoustic communication architectures.


Added on: March 15th, 2012 by 6 Comments

Gi-Fi or Gigabit Wireless is the world’s first transceiver integrated on a single chip that operates at 60GHz on the CMOS process. It will allow wireless transfer of audio and video data up to 5 gigabits per second, ten times the current maximum wireless transfer rate, at one-tenth of the cost, usually within a range of 10 meters. It utilizes a 5mm square chip and a 1mm wide antenna burning less than 2m watts of power to transmit data wirelessly over short distance, much like Bluetooth.

Gi-Fi will helps to push wireless communications to faster drive. For many years cables ruled the world. Optical fibers played a dominant role for its higher bit rates and faster transmission. But the installation of cables caused a greater difficulty and thus led to wireless access. The foremost of this is Bluetooth which can cover 9-10mts. Wi-Fi followed it having coverage area of 91mts. No doubt, introduction of Wi-Fi wireless networks has proved a revolutionary solution to “last mile” problem. However, the standard’s original limitations for data exchange rate and range, number of changes, high cost of the infrastructure have not yet made it possible for Wi-Fi to become a total threat to cellular networks on the one hand, and hard-wire networks, on the other. But the man’s continuous quest for even better technology despite the substantial advantages of present technologies led to the introduction of new, more up-to-date standards for data exchange rate i.e., Gi-Fi.

The development will enable the truly wireless office and home of the future. As the integrated transceiver is extremely small, it can be embedded into devices. The breakthrough will mean the networking of office and home equipment without wires will finally become a reality.
In this book we present a low cost, low power and high broadband chip, which will be vital in enabling the digital economy of the future.