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A Parallel Transmission Method of Underwater Acoustics Based on Active Time Reversal

A technology of time reversal and transmission method, applied in the direction of transmission system, digital transmission system, baseband system, etc., can solve the problems such as the inability to completely eliminate ISI and ILI, poor communication performance, etc., to save transmission power and spatial reuse. improved effect

Active Publication Date: 2021-07-16
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

It is worth noting that the time reversal technology cannot completely eliminate the existence of ISI and ILI, which makes the communication performance in the case of underwater acoustic parallel transmission not good

Method used

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  • A Parallel Transmission Method of Underwater Acoustics Based on Active Time Reversal
  • A Parallel Transmission Method of Underwater Acoustics Based on Active Time Reversal
  • A Parallel Transmission Method of Underwater Acoustics Based on Active Time Reversal

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] in such as figure 1 In the shown underwater acoustic communication system, the present invention proposes as figure 2 The scheme diagram of the underwater acoustic parallel transmission system based on active time reversal is shown, and the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] The position of the four nodes is as figure 1 As shown, the communication distance is 1km, the interference distance is 1.414km, and the BPSK modulation method is adopted.

[0039] Step 1: Acquisition of channel information: Transmitting nodes 1 and 2 receive the probe signal p(t) sent by the receiving node through two handshakes with receiving nodes 1 and 2 respectively, and use the probe signal to obtain the channel information between the transmitting node and the receiving node. Cha...

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Abstract

The present invention provides an underwater acoustic parallel transmission method based on active time reversal, which uses the spatial weak correlation of channel responses between different links caused by complex underwater acoustic multipath propagation to obtain the space-time focus of the signal at the receiving position, combined with Up / down sampling can effectively suppress the influence of inter-link interference in parallel transmission scenarios, improve the degree of spatial multiplexing, and combine power control methods to minimize the transmit power of the transmitting node under the premise of meeting the specific quality of service of the receiving node . The present invention weakens the broadcast characteristics of the underwater acoustic channel, and plays a key role in effectively isolating signal interference between adjacent links in a distributed multi-hop environment; the up / down sampling method further suppresses inter-link interference and inter-symbol interference, making space The multiplexing degree is further improved; the power control method saves transmission power under the premise of effectively suppressing inter-link interference, and these characteristics endow the present invention with effectiveness in the underwater acoustic parallel transmission scenario.

Description

technical field [0001] The invention relates to the field of underwater communication, in particular to time reversal theory, up-down sampling method, power control method and the like. Background technique [0002] The ocean is rich in resources. With the continuous exploitation and depletion of land resources, the pace of human beings entering the ocean is accelerating. Due to the development of the ocean, the marine military is inseparable from underwater communication. People's demand for underwater communication is increasing. Compared with radio waves, sound waves have less attenuation in underwater propagation and are the best form of energy for underwater communication. Therefore Underwater acoustic communication has become the key research content of various countries. [0003] Different from the wireless channel, the underwater acoustic channel not only has a large propagation delay and a low information rate, but also is affected by the harsh multipath propagatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04L25/03
CPCH04B13/02H04L25/03006
Inventor 赵瑞琴刘智豪龙浩梅毫迪刘媛赵月瑶
Owner NORTHWESTERN POLYTECHNICAL UNIV
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