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Underwater acoustic parallel transmission method based on active time reversal

A technology of time reversal and transmission method, applied in transmission systems, digital transmission systems, baseband systems, etc., can solve the problems of inability to completely eliminate ISI and ILI, poor communication performance, etc., and achieve the effect of weakening the broadcast characteristics

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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

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  • Underwater acoustic parallel transmission method based on active time reversal
  • Underwater acoustic parallel transmission method based on active time reversal
  • Underwater acoustic parallel transmission method 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 invention provides an underwater acoustic parallel transmission method based on active time reversal. Spatial weak correlation of channel response between different links caused by complex underwater acoustic multipath propagation is utilized; the space-time focusing of the signal at the receiving position is obtained, the influence of inter-link interference in a parallel transmission scene is effectively suppressed by combining up / down sampling, the spatial multiplexing degree is improved, and the transmitting power of the transmitting node is minimum on the premise of meeting the specific service quality of the receiving node by combining a power control method. According to the method, the broadcast characteristic of an underwater acoustic channel is weakened, and the key effect ofeffectively isolating signal interference between adjacent links in a distributed multi-hop environment is achieved; the up / down sampling method further suppresses inter-link interference and inter-symbol interference, so that the spatial multiplexing degree is further improved. According to the power control method, the transmitting power is saved on the premise that inter-link interference is effectively suppressed, and the method is endowed with effectiveness in an underwater acoustic parallel transmission scene due to the characteristics.

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 Applications(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
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