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Incoherent underwater acoustic communication method and system based on actual channel fading statistics

A technology for underwater acoustic communication and channel fading, which is applied in the direction of link quality-based transmission modification, transmission system, digital transmission system, etc., and can solve the problems of low spectrum utilization and poor robustness of incoherent underwater acoustic communication.

Active Publication Date: 2019-11-12
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of extremely low spectrum utilization and poor robustness of incoherent underwater acoustic communication in the prior art;

Method used

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  • Incoherent underwater acoustic communication method and system based on actual channel fading statistics
  • Incoherent underwater acoustic communication method and system based on actual channel fading statistics
  • Incoherent underwater acoustic communication method and system based on actual channel fading statistics

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Embodiment 1

[0078] Embodiment 1 of the present invention proposes an incoherent underwater acoustic communication method based on actual channel fading statistics, performs degree optimization design on irregular codes for actual underwater acoustic fading channels, performs OOK modulation with memory, and provides iterative translation code optimization algorithm, and design a non-coherent underwater acoustic communication method with high spectrum utilization and good robustness, which includes:

[0079] The first step is to send the information bit u l (wherein 0≤l

[0080] In the second step, the irregular convolutional code composed of 17 subcodes proposed by Tüchler is used as the outer code, the code rate is fixed at 0.5, and the irregular code is encoded according to the degree distribution fed back by the receiving end of the last communication.

[0081] In the third step, the coded bits enco...

Embodiment 2

[0137] Such as Figure 4 As shown, Embodiment 2 of the present invention proposes an incoherent underwater acoustic communication system based on actual channel fading statistics. The system includes: a transmitting module arranged at the transmitting end and a receiving module arranged at the receiving end, and the receiving module includes: Irregular code encoder, interleaver, accumulator and multi-carrier on-off keying modulator; the receiving module includes: multi-carrier on-off keying demodulator, logarithmic likelihood ratio biaser, ACC decoder, decoding interleaver, random decoder, interleaver and iterative threshold estimator;

[0138] Among them, the external decoder adopts an irregular code decoder, and the internal decoder adopts an ACC decoder, both of which are soft input soft output (SISO, Soft Input Soft Output) decoders based on the Max-Log-APP algorithm.

[0139] The transmitting module is used to perform irregular code encoding, interleaving and accumulatio...

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Abstract

The invention provides an incoherent underwater acoustic communication method and an incoherent underwater acoustic communication system based on actual channel fading statistics. The method comprisesthe following steps that: a transmitting end performs irregular code encoding, interleaving and accumulation on information bits to be transmitted, performs multi-carrier on-off keying modulation onthe accumulated encoding bits, converts a modulated signal into an analog signal and transmits the analog signal to a receiving end; the receiving end performs on-off keying demodulation, log-likelihood ratio bias processing, ACC internal code interleaving decoding, de-interleaving operation and irregular code iterative decoding and iterative threshold estimation calculation on the received analogsignal, and outputs decoded information bits to complete incoherent underwater acoustic communication; and meanwhile, channel fading characteristics are counted, irregular code degree optimization iscarried out, and the optimized degree distribution is fed back to a transmitting end through a control channel for irregular code coding of next communication. The incoherent underwater acoustic communication method and the incoherent underwater acoustic communication system based on actual channel fading statistics have the advantages of high spectrum utilization rate and good robustness.

Description

technical field [0001] The invention belongs to the technical field of incoherent underwater acoustic communication, and in particular relates to an incoherent underwater acoustic communication method and system based on actual channel fading statistics. Background technique [0002] The submarine observation network is an important scientific observation platform, and underwater acoustic communication is an important means for information exchange between observation nodes and the backbone network. Since the submarine observation network is a typical power-limited system, and the underwater acoustic channel has the characteristics of strong time-varying, severe multi-path fading, and strong Doppler effect, non-coherent communication is not dependent on channel phase information and has good robustness. Advantages, it has a wide range of applications in the transmission of data, text and instructions. [0003] At present, the non-coherent modulation method commonly used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B13/02H04L1/00
CPCH04B13/02H04L1/0009H04L1/0054H04L1/0071
Inventor 武岩波姚衍朱敏房小芳李栋
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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