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An asynchronous underwater full-rate cooperative communication method

A cooperative communication and full-rate technology, applied in the direction of sustainable communication technology, preventing/detecting errors through diversity reception, advanced technology, etc., can solve the problems of low transmission efficiency and slow speed, and achieve the effect of increasing the transmission rate

Inactive Publication Date: 2017-06-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages and deficiencies of the existing underwater cooperative communication technology, such as low transmission efficiency and slow speed, and provide an asynchronous underwater full-rate cooperative communication method, which uses a full-rate cooperative mode to improve the source node The transmission rate of information, and the use of asynchronous transmission mechanism to reduce the time of synchronous waiting, thereby significantly improving the efficiency and speed of transmission

Method used

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  • An asynchronous underwater full-rate cooperative communication method
  • An asynchronous underwater full-rate cooperative communication method
  • An asynchronous underwater full-rate cooperative communication method

Examples

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Embodiment 1

[0037] This embodiment is an underwater acoustic communication network comprising M+2 nodes, such as Figure 4 As shown, where S is the source node that needs to send data, D is the destination node, R i (0i , S → D, R i →D The maximum distance of these three links is 2km, and the size of the data packet is 240 bytes. If synchronous full-rate cooperative communication is used, the cooperative transmission needs two time slots to complete, and each time slot requires at least Such a long time slot will seriously reduce the channel capacity. Therefore, in the above embodiments, the asynchronous full-rate cooperative communication method is adopted between nodes, which can effectively increase the sending rate of source node information and reduce the waiting time for synchronization, thereby significantly improving the efficiency and speed of transmission.

[0038] This embodiment adopts the following steps to realize asynchronous underwater full-rate cooperative communicati...

Embodiment 2

[0084] This embodiment is the same as Embodiment 1 except for the following:

[0085] Such as Image 6 As shown, it is a structural diagram of the dual-relay full-rate cooperative communication system in this embodiment, the source node S sends information omnidirectionally by broadcasting, and the H SR1 、H SR2 、H SD is the channel impulse response from the source node to the relay nodes R1, R2 and from the source node to the destination node D. After receiving the information of the source node, the relay nodes R1 and R2 also use the same channel as the source node to amplify and forward the information of the source node in a broadcast manner, H R1R2 、H R1D is the channel impulse response from relay node R1 to relay node R2 and the destination node, H R2R1 、H R2D is the channel impulse response from the relay node R2 to the relay node R1 and the destination node. The information received by the destination node includes the information sent by the source node and the ...

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Abstract

The invention discloses an asynchronous underwater full-rate cooperative communication method. The method includes the following steps that first, a source node acquires the right to use a channel and sends data; second, when the number of relay nodes capable of being used in the current transmission is larger than or equal to two, a full-rate cooperative communication mode is started; third, the relay nodes capable of being used are divided into N groups, the relay nodes in all the groups monitor data frames sent by the source node, when the nth group of relay nodes monitor the ith frame of data, if the remainder generated by dividing i by N is n, the group of relay nodes receive the frame of data, and if not, the monitoring is continued; a target node receives the data frames sent by the source node and the data frames forwarded by all the groups of relay nodes; after data transmission of the source node is completed, a stop signal is sent, the relay nodes receive the stop signal, forward the stop signal and then stop relay transmission, and the target node stops receiving after receiving the stop signal. The method has the advantages that the transmission rate is improved, and cost and power consumption are low.

Description

technical field [0001] The invention relates to an underwater acoustic communication technology, in particular to an asynchronous underwater full-rate cooperative communication method. Background technique [0002] Multi-path interference is one of the main factors affecting the speed of underwater acoustic communication. When sound waves propagate in water, due to the boundary reflection of the water interface and the bending of sound rays during propagation, there are a large number of transmission paths between the transmitting node and the receiving node, causing random fluctuations in the amplitude of the received signal and delay spread of the signal . Compared with terrestrial electromagnetic wave channels, the multi-path effect of underwater acoustic channels has the characteristics of long delay extension and random time-space-frequency variation, which is more difficult to deal with. Diversity is an effective technology to resist multipath fading. Due to the narr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L5/00H04B13/02
CPCY02D30/50
Inventor 张军李婷冯义志宁更新季飞余华陈芳炯韦岗
Owner SOUTH CHINA UNIV OF TECH
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