Multi-carrier underwater high-speed communication system based on filter bank

A high-speed communication, filter bank technology, applied in multi-carrier systems, modulated carrier systems, baseband systems, etc., can solve the problems of reducing transmission speed, time non-stationary, implementation difficulties, etc., to reduce difficulty, reduce difficulty, and improve TFL Effects of Features

Pending Publication Date: 2020-06-30
常熟海量声学设备科技有限公司
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Problems solved by technology

Acoustic waves will inevitably propagate along many different paths. The signal received by the receiving end presents the characteristics of frequency selective fading, time selective fading and non-stationary characteristics. Severe intersymbol interference makes underwater communication face huge challenges. There are also great difficulties in the real

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  • Multi-carrier underwater high-speed communication system based on filter bank
  • Multi-carrier underwater high-speed communication system based on filter bank
  • Multi-carrier underwater high-speed communication system based on filter bank

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Embodiment Construction

[0024] The present invention is described in detail below in conjunction with accompanying drawing:

[0025] Such as figure 1 As shown, the communication flow described in the present invention mainly includes the following parts:

[0026] Detailed description of process 1:

[0027] Process 1, process 1, the transmitted signal symbols are subjected to Turbo encoding and then offset quadrature amplitude modulation (OQAM). Turbo encoding parameters are: generation matrix G=[111; 101]; encoding rate rate=1 / 2. OQAM modulation is to map the encoded signal symbols through 4QAM modulation, and map them to [0.707+0.707i; 0.707-0.707i; -0.707+0.707i; -0.707-0.707i] four complex points; The real and imaginary parts of the mapped signal are separated and the real value is taken for subsequent processing.

[0028] Detailed description of process 2:

[0029] Process 2, inserting a training sequence into the mapped signal for equalization at the receiving end, after IFFT transformation,...

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Abstract

The invention discloses a multi-carrier underwater high-speed communication system (Filter Bank Multi-carrier (FBMC)) based on a filter bank. At a sending end, a sending signal is subjected to Turbo coding and 4QAM mapping, then is subjected to filtering forming through a pulse forming filter based on an extended Gaussian function (EGF), and finally is subjected to signal sending after being subjected to IFFT, serial-parallel conversion, up-sampling and other processing. At a receiving end, after being processed by a passive time reversal mirror (PTRM) technology, a received signal is subjected to down-sampling, parallel-serial conversion, FFT and pulse shaping filtering, and then is processed by a frequency domain decision feedback equalizer (F-DFE) to obtain a received signal; the effectiveness of the method provided by the invention is proved through simulation, and compared with a common multi-carrier system, the method provided by the invention can achieve a higher transmission speed under lower spectrum resources, and can also obtain high-quality transmission performance at a receiving end.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and relates to a design of a communication system for signal transmission in a complex underwater acoustic environment. It involves EGF pulse shaping filter, passive time reversal (PTRM) and other methods. Background technique [0002] How to realize underwater high-speed communication has always been a priority problem in the field of underwater acoustic communication. With the continuous development of human beings, the importance of the ocean has become more and more prominent. Acoustic waves are currently the only and most effective form of energy that can travel long distances in the ocean. Therefore, underwater acoustics play an extremely important role in the national ocean development strategy, and high-speed underwater acoustic communication has attracted more and more attention. High-speed underwater acoustic communication has good development prospects in both military...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/36H04L25/03
CPCH04L27/264H04L27/2628H04L27/362H04L25/03171H04L25/03159
Inventor 朱向东马跃宏王彪
Owner 常熟海量声学设备科技有限公司
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