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

Improved SAMP underwater acoustic channel estimation algorithm

An estimation algorithm and underwater acoustic channel technology, which can be used in modulation carrier systems, transmission systems, multi-frequency code systems, etc., and can solve the problem of difficulty in defining sparsity.

Inactive Publication Date: 2020-10-20
HARBIN INST OF TECH AT WEIHAI
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to define the sparsity in the actual process. The sparsity of the channel does not only exist non-zero pulses and zero values, it should be the coexistence of high-energy pulses and low-energy pulses

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
  • Improved SAMP underwater acoustic channel estimation algorithm
  • Improved SAMP underwater acoustic channel estimation algorithm
  • Improved SAMP underwater acoustic channel estimation algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with specific examples.

[0027] Step 1: Assume that the water depth in the experimental conditions is 100m, the depth of the transmitting transducer is 20m and 30m respectively, the receiving end transducer is 40m and 50m below sea level, and the level between the transmitting transducer and the receiving transducer is The distance is 1km, the speed of sound is 1500m / s, and the maximum channel delay is 40ms. According to the channel conditions, the selection parameters of OFDM are as follows. The length of the cyclic prefix is ​​60ms, the number of subcarriers is 512, the subcarrier interval is 2.5Hz, and the carrier frequency is 20480Hz. Let the receiving end signal of the pilot be the observation vector y, and set the pilot The signal matrix is ​​the measurement matrix X, the sparsity is K, the number of initialization iterations is t=1, and the residual r 0 =y, Λ t Represents the set of indic...

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 an improved SAMP underwater acoustic channel estimation algorithm. The invention aims at a pilot signal of a subcarrier in an MIMO-OFDM underwater acoustic communication system, based on the improvement of an SAMP (Sparsity Adaptive Matching Pursuit) algorithm, the original iteration condition is replaced by setting the second-order difference of adjacent residual errors,and clutters are further filtered according to the channel pulse energy ratio, so that the system performance can be effectively improved. Figure 1 in the abstract drawing of the specification is a specific implementation flow chart of the invention.

Description

Technical field: [0001] The invention belongs to the technical field of underwater acoustic communication, and is specifically based on the improvement of the SAMP (Sparseness Adaptive Matching and Pursuit) algorithm. The sparseness is estimated by using the secondary difference of adjacent residuals, so that the reconstructed signal is more accurate. Background technique: [0002] The acoustic channel is a complex and changeable channel, which has the characteristics of limited bandwidth and large multi-path delay expansion. Low-speed communication systems can no longer meet people's needs for ocean communication. The MIMO-OFDM communication system has the characteristics of stability and high speed. In recent years, it has been paid attention to by many scholars. In the aspect of underwater acoustic communication, it has gradually become a research hotspot. MIMO technology can not only increase the diversity gain through space-time coding, but also double the channel capa...

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 Applications(China)
IPC IPC(8): H04L27/26H04B7/0413H04B13/02
CPCH04B13/02H04B7/0413H04L27/261H04L27/2695Y02D30/70
Inventor 王好贤李尊琦周志权
Owner HARBIN INST OF TECH AT WEIHAI
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