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Distributed multi-channel underwater acoustic network communication method

A technology of underwater acoustic network and communication method, which is applied in wireless communication, electrical components, etc., and can solve problems such as long handshake time and poor performance

Active Publication Date: 2020-02-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the handshake time takes a long time, and the handshake time increases with the increase of the number of nodes, and the performance is not good in a large-scale network

Method used

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  • Distributed multi-channel underwater acoustic network communication method
  • Distributed multi-channel underwater acoustic network communication method
  • Distributed multi-channel underwater acoustic network communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment is an underwater acoustic communication network with 6 nodes, each node is located on a plane 100 meters underwater, and the coordinate system is established with the horizontal position and depth of the node as the X, Y, and Z axes, with meters as the unit, and the node The coordinates of 1 to 6 are (-400, 0, 100), (-400, 100, 100), (-200, 200, 100), (200, 200, 100), (400, 100, 100), (400, 0, 100). Each node is a static node and can listen to the signals of other nodes. Each node is equipped with three underwater acoustic modulation and demodulation systems that can send and receive data independently. The communication mode of each underwater acoustic modulation and demodulation system is omnidirectional, half-duplex, and has the same data transmission rate. A transmission cycle includes a handshake phase and a data transmission phase, and all nodes use data packets of the same length and RTS and CTS signaling of the same length. All nodes have synch...

Embodiment 2

[0118] In this embodiment, the hardware structure of the network node is the same as that in Embodiment 1, but a transmission cycle includes a handshake phase, a data transmission phase, and an ACK / NACK phase, and the tth super step includes the parallel handshake of the tth transmission cycle stage, the data transmission stage of the t-1th transmission cycle, and the ACK / NACK stage of the t-2th transmission cycle, the timing of which is as follows image 3 shown. The difference from Embodiment 1 is that in the above step S1, if the t-1th super step includes the data transmission stage of the t-2th transmission cycle, the destination node of the t-2th transmission cycle is at the tth ACK / NACK signaling is sent in the CTS time slot of the handshake phase of the tth transmission cycle in the super step, at this time with Use the following formula to calculate

[0119]

[0120]

[0121] where P ACK is the transmission duration of ACK / NACK signaling.

Embodiment 3

[0123] In this embodiment, the network node is equipped with only one underwater acoustic modulation and demodulation system, but adopts OFDMA, CDMA or FDMA technology to realize multiple parallel channels. The difference from Embodiment 1 and Embodiment 2 is that Embodiment 1 and The three underwater acoustic modulation and demodulation systems in the second embodiment can send and receive data independently, while in the third embodiment, the nodes can only use N parallel communication channels to receive or send data at the same time. At this time, the transmission cycle of Embodiment 3 needs to include the handshake phase, the data transmission phase, and the ACK / NACK phase at the same time, so as to ensure that the source node can obtain the information of the nodes that have successfully handshaked in the current transmission cycle in the ACK / NACK phase, and determine the next super step. The information channel used, whose timing is as image 3 shown.

[0124] In other...

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Abstract

The invention discloses a distributed multi-channel underwater acoustic network communication method. According to the method, parallel transmission of data is realized by simultaneously utilizing thecharacteristic of information propagation time delay of a plurality of communication channels and underwater acoustic channels; handshake signaling is sent by adopting an optimized time division multiplexing method in some communication channels, data is sent in parallel by adopting optimized sending time in other communication channels, and the handshake signaling and the data are transmitted inparallel in an assembly line mode. Compared with the prior art, the method has the advantages that parallel transmission is carried out by fully utilizing the characteristic that the propagation timeof multi-channel and underwater acoustic channel information is prolonged, central node control is not needed, overhead caused by handshake can be reduced while transmission conflicts are completelyeliminated in a distributed network, and the communication efficiency of the underwater acoustic network is effectively improved. The method can be widely applied to distributed underwater acoustic communication networks, underwater acoustic sensor networks and other occasions.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to a distributed multi-channel underwater acoustic network communication method. Background technique [0002] Underwater acoustic network is one of the important subjects of underwater communication research, and has a wide range of uses in underwater exploration, underwater oil exploitation, tactical monitoring, pollution monitoring, tsunami early warning, auxiliary navigation, ecological monitoring, etc. The underwater acoustic channel has the characteristics of narrow frequency band, strong interference, time extension, and limited energy, which makes the Medium Access Control (MAC) technology of the control node share the channel a key factor affecting the performance of the underwater acoustic communication network. [0003] In the current underwater acoustic network, the MAC protocol can be roughly divided into three types: non-competitive, competiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0816
Inventor 张军宁更新冯义志季飞余华陈芳炯
Owner SOUTH CHINA UNIV OF TECH
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