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A Marine Inductively Coupled Link Communication Method Resistant to Seawater Multipath Effect

A technology of inductive coupling and multipath effect, which is applied in the direction of error detection/prevention, transmission monitoring, and digital transmission system using signal quality detectors, which can solve the problems of inability to establish long-distance inductive coupling mooring chain channels and inability to test.

Inactive Publication Date: 2021-04-20
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to design a marine inductive coupling chain communication system capable of resisting seawater multipath effects by proposing a communication method for marine inductive coupling chains that resist seawater multipath effects. The communication system simulates the marine inductive coupling chain There are phenomena such as multipath delay effect in the channel, and the OFDM hardware transceiver system is added to the system, and the data transmission and testing of the entire system are realized, which reduces the difficulty of related testing applied to the inductively coupled mooring chain channel, and solves the problem of The problem that it is impossible to establish a long-distance inductively coupled mooring chain channel and cannot be tested has accelerated the application of related equipment and greatly promoted the development of marine communication technology

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  • A Marine Inductively Coupled Link Communication Method Resistant to Seawater Multipath Effect
  • A Marine Inductively Coupled Link Communication Method Resistant to Seawater Multipath Effect
  • A Marine Inductively Coupled Link Communication Method Resistant to Seawater Multipath Effect

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Embodiment Construction

[0024] Step 1. Design of multi-path channel FPGA hardware simulator for inductive coupling transmission chain current signal transmission in seawater

[0025] According to the simulation, the mathematical model of the inductive coupling chain channel is obtained, as shown in formula (1).

[0026]

[0027] Among them, f is the transmission signal frequency, N is the number of paths, g i is the weighting factor for each path, k(f) is the normalized amplitude attenuation at different frequencies, τ i is the time delay amount of each path, e -α is the channel attenuation parameter.

[0028] According to the multipath transmission mathematical model mentioned above, the path, path length and relative delay of each path in the table below are calculated. Since the path delay of the multipath channel simulator below is realized by clock counting, and the system clock frequency is 50MHz, that is, 20ns, the counter value required for each path delay can be calculated accordingly....

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Abstract

The multipath effect of the seawater channel is one of the key issues affecting the communication performance of the inductively coupled chain used in the ocean, so the present invention proposes a communication method for the inductively coupled link used in the ocean to resist the multipath effect of seawater; according to the mathematical model of the inductively coupled chain seawater channel The calculated number of paths, the delay of each path and the parameters of amplitude attenuation realize the multipath channel hardware simulator; study OFDM technology and propose an FPGA algorithm scheme that can resist multipath effects, and realize the OFDM transceiver system; The path simulator and OFDM transceiver system constitute the test platform for the marine inductive coupling chain communication system. The transmission performance test of the platform is completed, the relationship between the CP length and the maximum delay of the channel is analyzed, and the optimal CP length and the signal-to-noise condition under this CP length are determined. Comparing the influence of the bit error rate of the transmitted data; the invention provides a laboratory test platform for studying the multipath delay effect of the inductive coupling chain, and provides a new method for improving the transmission performance of the channel.

Description

technical field [0001] The present invention takes the marine inductive coupling chain multipath transmission channel as the application prototype, and proposes a marine inductive coupling chain communication method that resists the seawater multipath effect. The method first performs hardware simulation of the multipath channel in the marine inductive coupling chain , realized the FPGA-based multipath channel simulator, and completed the OFDM hardware transceiver system on this basis. Finally, a marine inductive coupling chain communication system test platform that resists seawater multipath effects was built in the laboratory, and the data was completed. The test of transmission performance proves the feasibility and effectiveness of this method, and provides a new method for improving the communication performance of inductively coupled chains used in oceans. Background technique [0002] As one of the important technologies of ocean measurement, the inductive coupling l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/391H04B17/00H04L1/20
CPCH04B17/0087H04L1/203H04B17/3911H04B17/3912
Inventor 郑羽张笑阳张赛郭兴欣卢彦芳袁佳敏
Owner TIANJIN POLYTECHNIC UNIV
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