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Rateless underwater acoustic communication-oriented joint blind frequency domain equalization and rateless decoding algorithm

A frequency domain equalization, underwater acoustic communication technology, applied in the direction of shaping network, baseband system, digital transmission system in transmitter/receiver, can solve the problems of high complexity and low transmission efficiency

Active Publication Date: 2019-12-13
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

[0004] Aiming at the problems of high complexity and low transmission efficiency of existing related technologies, the present invention proposes a joint blind frequency domain equalization and rateless decoding algorithm for rateless underwater acoustic communication

Method used

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  • Rateless underwater acoustic communication-oriented joint blind frequency domain equalization and rateless decoding algorithm
  • Rateless underwater acoustic communication-oriented joint blind frequency domain equalization and rateless decoding algorithm
  • Rateless underwater acoustic communication-oriented joint blind frequency domain equalization and rateless decoding algorithm

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Embodiment Construction

[0103] The blind frequency domain equalization performance analysis based on decision feedback structure in the present invention is as follows:

[0104] The invention proposes a joint blind frequency domain equalization and rateless decoding algorithm. For joint realization, the present invention firstly proposes a blind frequency domain equalization based on decision feedback structure, and then provides a joint realization scheme on this basis, which can jointly realize blind frequency domain equalization and rateless decoding.

[0105] The block diagram of the rateless transmission system is as follows: figure 1 shown. a(n) is the source signal, c(n) is obtained by LT coding, c(n) is modulated signal r(n) obtained through the modulator, and the received signal u of the transmitted modulated signal r(n) passes through the underwater acoustic channel (n), which can be expressed as follows:

[0106]

[0107] Among them, h(n) represents the impulse response of the channe...

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Abstract

The invention relates to the technical field of underwater acoustic communication. The invention relates to a blind frequency domain equalization and rateless decoding algorithm, in particular to a rateless underwater acoustic communication-oriented joint blind frequency domain equalization and rateless decoding algorithm. Firstly, blind frequency domain equalization based on a decision feedback structure is provided; and on the basis, soft information is exchanged between blind frequency domain equalization and a rateless decoder, so that iterative processing similar to Turbo equalization isrealized, the reliability and the transmission efficiency of the system are improved, and the effectiveness and the advantages of the scheme are verified by a simulation result.

Description

Technical field: [0001] The invention relates to the technical field of underwater acoustic communication, in particular to a joint blind frequency domain equalization and rateless decoding algorithm for rateless underwater acoustic communication. Background technique: [0002] Underwater acoustic channels have problems such as serious multi-channel phenomenon, high environmental noise, and prolonged transmission time. In order to effectively overcome severe intersymbol interference (Intersymbol Interference, ISI) caused by multipath fading, equalization technology is usually used, and channel coding technology can be used to improve transmission reliability. In the 1980s, there have been related researches considering the joint processing of decoding and equalization to achieve joint optimization. [0003] Rateless code is a coding method without a fixed code rate. The basic principle is that each coded signal has partial information of all coded information, and the sendi...

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Application Information

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IPC IPC(8): H04B13/02H04L25/03
CPCH04B13/02H04L25/03949H04L2025/03522
Inventor 刘志勇谭周美白帆
Owner HARBIN INST OF TECH AT WEIHAI
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