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Underwater acoustic network reservation multi-access method based on active time reversal

A time-reversal, underwater acoustic network technology, applied in network traffic/resource management, multiplexing communication, orthogonal multiplexing system, etc., can solve the problem of limited bandwidth and energy consumption, low channel utilization, energy problems such as low utilization, to avoid transmission conflicts, reduce network energy consumption, and save energy

Active Publication Date: 2016-10-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0008] In order to overcome the deficiencies of the existing technologies and solve the problems of low channel utilization, extended propagation time, and low energy utilization caused by transmission conflicts in the multiple access process of the existing underwater network, the underwater wireless multi-hop distribution Due to the characteristics of large number of network nodes, limited bandwidth and energy consumption, the present invention provides a distributed underwater acoustic network probe reservation multiple access method based on active TR

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  • Underwater acoustic network reservation multi-access method based on active time reversal
  • Underwater acoustic network reservation multi-access method based on active time reversal
  • Underwater acoustic network reservation multi-access method based on active time reversal

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026]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 realize time 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 phase, 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 achieving suppress...

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Abstract

The invention provides an underwater acoustic network reservation multi-access method based on active time reversal, and relates to the technical field of underwater acoustic communication and underwater networks. Multiple access in the data transmission process among nodes, which is applicable to a distributed acoustic network MAC layer, is adopted, so that the transmission conflicts are avoided, the success probability and channel utilization rate of once transmission are substantially improved, and the networking energy consumption is lowered; by means of active TR space-time focusing and the space change characteristic of an underwater acoustic channel, the disadvantages are converted into advantages, the broadcasting characteristics of the underwater acoustic channel is weakened, the signal interference among adjacent links under a distributed multi-hop environment is effectively isolated, and the good transmission concealment and security of the multi-access method are realized by channel broadcasting weakening, so that the space multiplexing is improved, the network throughput is increased, the time delay of the system is shortened, 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 the underwater acoustic network, multiple access control (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 mec...

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Application Information

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IPC IPC(8): H04W28/04H04W74/08H04J11/00H04L1/18
CPCH04J11/0023H04L1/18H04W74/0858Y02D30/50Y02D30/70
Inventor 赵瑞琴王勇申晓红王海燕白卫岗张之琛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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