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Time-reversal multiple access method applicable to underwater acoustic network

An underwater acoustic network, time-reversal technology, applied in error prevention/detection using return channel, baseband system, digital transmission system, etc., can solve the problems of difficult to guarantee channel correlation, large number of nodes, limited bandwidth and energy consumption, etc. , to achieve the effect of reducing network energy consumption, reducing system delay, and avoiding transmission conflicts

Active Publication Date: 2017-04-19
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0008] In order to overcome the deficiencies of the existing technology and solve the problem that it is difficult to completely avoid conflicts when the weak channel correlation is broken in the existing active time reversal-based underwater acoustic network reservation multiple access mechanism, the underwater wireless The multi-hop distributed network has a large number of nodes, channel correlation is difficult to guarantee, and bandwidth and energy consumption are limited. The present invention provides an improved time-reverse multiple access method suitable for underwater acoustic networks.

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  • Time-reversal multiple access method applicable to underwater acoustic network
  • Time-reversal multiple access method applicable to underwater acoustic network
  • Time-reversal multiple access method applicable to underwater acoustic network

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Time Reversal (TR, Time Reversal) processing is based on the principles of transmission reciprocity and time reversal invariance, and can utilize the space-variant characteristics of complex multipath channels to achieve temporal compression and spatial focus of received multipath signals. On the one hand, the time focus of active TR makes the multipath signals at the target node superimpose at the same time and in phase, which realizes multipath diversity, effectively cancels the intersymbol interference and improves the signal-to-noise ratio; on the other hand, the active TR The spatial focus enables only the target node to receive a signal with strong energy and time compression, and the received signal energy at other positions in space is very small, which greatly reduces the energy pollution of the signal at the non-target node, thereby achi...

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Abstract

The invention provides a time-reversal multiple access method applicable to an underwater acoustic network and relates to the underwater acoustic communication and underwater network technology field. According to the method, a multiple access mechanism is appointed for an active time-reversal underwater acoustic network, conflicts and bump can be completely avoided when channel correlation is broken, success transmission probability is improved, through active TR space time focusing, spatial variation characteristics of an underwater acoustic channel is utilized to weaken broadcast characteristics of the underwater acoustic channel, not only can the crucial effect of effectively isolating signal interference among adjacent links under the distributed multi-hop environment be realized, but also excellent transmission concealment and confidentiality of the multiple access method is realized through weakening the broadcast characteristics of the underwater acoustic channel, on the condition that underwater acoustic correlation is not determined, spatial reuse and network throughput can be further improved even when channel weak correlation is broken, system time delay is reduced, and energy is saved.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication and underwater network, in particular to a channel multiple access method of an underwater acoustic network. Background technique [0002] In an underwater acoustic network, MAC (Media Access Control) is responsible for coordinating efficient and fair access channels for all nodes in the network, aiming to avoid transmission conflicts when different nodes access shared channels. Without the support of an efficient MAC mechanism, data packet transmission collisions between adjacent links in the process of exchanging information between nodes in the network will reduce network throughput, increase system delay, and cause very low channel utilization. rate and battery energy utilization, seriously deteriorating network performance. In underwater acoustic networks where bandwidth and energy resources are very precious, designing an efficient MAC mechanism suitable for underw...

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Application Information

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IPC IPC(8): H04B13/02H04L1/18H04L25/02
CPCH04B13/02H04L1/1848H04L25/0212
Inventor 赵瑞琴李淼王勇申晓红王海燕白卫岗
Owner NORTHWESTERN POLYTECHNICAL UNIV
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