1 / 13

Underwater wireless communication

Underwater wireless communication. By: k.shiva shankar Electronics and communication engineering (06J11A04A4). INTRODUCTION.

stefani
Download Presentation

Underwater wireless communication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Underwater wireless communication By: k.shiva shankar Electronics and communication engineering (06J11A04A4)

  2. INTRODUCTION • wireless communication technology today has become part of our daily life, the idea of wireless underwater communications may still seem far-fetched • Although cabled submersible systems remain indispensable but if high-speed communication link is to exists • wireless underwater communications with sensor technology and vehicular technology

  3. Communication channel • The signals that are used to carry digital information through an underwater channel are acoustic signals • An underwater acoustic channel presents a communication system designer with many difficulties • The signal is subject to multipath propagation, which is particularly pronounced on horizontal channels

  4. distance c tx tx rx Wave propagation • The figures show multipath propagation in water • In shallow water, multipath occurs due to signal reflection from the surface and bottom • In deep water, it occurs due to ray bending

  5. inp.1 com- biner data est. data out inp.2 forward _ + decision forward feedback filter coefficients inp. K sync. Adaptation training data • Adaptive decision-feedback equalizer (DFE) • Equalizer task is to unravel the inter symbol interference

  6. Underwater networks • Integrated networks of instruments, sensors, robots and vehicles will operate together in a variety of underwater environments • Depending on the application there two types of Acousticnetwork “Acoustic networks, navigation and sensing for multiple autonomous underwater robotic vehicles

  7. Centralized network topology • Centralized network, nodes communicate through a base station that covers one cell • In a decentralized network, nodes communicate via peer-to-peer • To accommodate multiple users within a selected network topology, the communication channel must be shared • Methods for channel sharing are based on scheduling or on contention • Decentralized network topology

  8. Current achievements • The modem has successfully been deployed in a number of trials • This modem is implemented in a fixed-point DSP with a floating-point co-processor • Multi-user communications each at 1.4 kbps in 5 kHz band

  9. Autonomous underwater vehicle (AUV) • Autonomous underwater vehicle (AUV) is a robot that travels underwater • Modem’s fit easily into the AUV • Low power consumption • Very reliable for high level throughput

  10. short distance high bandwidth acoustic link platform sea level AUV base station power, communications, oil base station base station Application to oil-field monitoring

  11. Applications • Environmental monitoring to gathering of oceanographic data • Marine archaeology • Search and rescue missions • Defence

  12. Conclusion • The aim of this is to build a acoustic communication as in figure • This is not only the way for underwater communication • By using optical waves which offers higher throughput (Mbps) over short distances (up to about 100 m)

  13. Thank you

More Related