Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Soft-in soft-out iterative soft-balanced underwater acoustic communication method based on receiving hydrophone array

A hydrophone array and underwater acoustic communication technology, which is applied to the shaping network, baseband system, baseband system components and other directions in the transmitter/receiver, can solve the problems of limited performance and poor reliability, and achieve improved adaptability , Reliability improvement, and the effect of suppressing multi-channel interference

Active Publication Date: 2018-08-17
HARBIN ENG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a soft-in and soft-out system based on receiving hydrophone arrays that solves the problem of limited performance and poor reliability of a single equalizer in the traditional iterative underwater acoustic channel equalization technology under the condition of underwater acoustic channels. Iterative Soft Equalization Method for Underwater Acoustic Communication

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Soft-in soft-out iterative soft-balanced underwater acoustic communication method based on receiving hydrophone array
  • Soft-in soft-out iterative soft-balanced underwater acoustic communication method based on receiving hydrophone array
  • Soft-in soft-out iterative soft-balanced underwater acoustic communication method based on receiving hydrophone array

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0045] Specific implementation mode one: combine figure 1 Description of this embodiment, the soft-in and soft-out iterative soft-balanced underwater acoustic communication method based on the receiving hydrophone array includes the following steps:

[0046] Step 1. The communication transmitter adopts binary QC-LDPC encoding to channel encode the binary information bit stream b, b=[b 1 ,b 2 ,...,b l ,...b L ], L is the length of the binary information bit stream, where b l ∈{0,1}, l=1,...,L; perform interleaving and symbol mapping on the coded information bit stream, and obtain the symbol stream x=[x 1 ,x 2 ,...,x k ,...x K ], K is the length of the symbol stream, k∈[1,K]; x k Can be any phase modulation symbol (as BPSK or QPSK etc.), the present invention is example with BPSK modulation; With x=[x 1 ,x 2 ,...,x K ] modulated onto the designated carrier and sent out;

[0047] Step 2, the transmission signal of step 1 reaches the receiving end of each hydrophone in...

specific Embodiment approach 2

[0049] Embodiment 2: The branch equalizer includes two parts: channel estimation and channel equalization. The channel equalization algorithm in the branch equalizer described in step 2 in this embodiment adopts a decision feedback equalization algorithm, a linear equalization algorithm or a decision feedback equalization algorithm. Combination algorithm with linear equalization algorithm.

[0050] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0051] Embodiment 3: The channel estimation part of the branch equalizer described in step 2 in this embodiment adopts the classic adaptive RLS algorithm.

[0052] Other steps are the same as in the second embodiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of underwater acoustic communication, in particular to a soft-in soft-out self-iterative soft equalization underwater acoustic communication method based on a receiving hydrophone array. The method comprises the following steps that a communication transmitting terminal carries out channel coding on a binary information bit stream b by adopting binary quasi ring low-density parity check code coding; after a transmitting signal passes through a multi-path extended channel, the transmitting signal reaches a receiving end of each hydrophone in the receiving hydrophone array; and each receiving hydrophone is taken as a branch equalizer of a self-iterative equalizer. In comparison with the conventional underwater acoustic channel equalization method, the multi-path interference can be effectively reduced, the communication performance is improved and approaches to an optimal MAP equalization algorithm, and the complexity is lower. In comparison with the conventional underwater acoustic channel equalization method, the reliability of the method is improved by more than 30%.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to a soft-in and soft-out iterative soft-balanced underwater acoustic communication method based on a receiving hydrophone array. Background technique [0002] In traditional (non-iterative, i.e., no soft information exchange between equalizer and decoder) communication systems, decision feedback equalization (DFE) outperforms linear equalization (LE), even though decision feedback equalization has errors transmission phenomenon. However, studies have shown that when the feedback filter output is a hard decision, the performance of the soft-in soft-out decision feedback equalizer (SISO-DFE) is much worse than that of the soft-in soft-out linear equalizer (SISO-LE), which is mainly due to the error transfer. In the classic decision feedback system, many techniques have been used to reduce error transmission. Recently, the two-way decision feedback idea was...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04L25/03
CPCH04B13/02H04L25/03057H04L25/0307H04L25/03108
Inventor 张友文孙大军肖爽黑晓龙刘璐勇俊刘鑫
Owner HARBIN ENG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com