Underwater acoustic communication adaptive modulation algorithm based on steady-state mean square error

An adaptive modulation, mean square error technology, applied in the direction of transmission modification based on link quality, baseband system, error prevention, etc. Communication system, etc.

Active Publication Date: 2019-01-29
HARBIN INST OF TECH AT WEIHAI
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, due to the complexity and variability of the underwater acoustic channel, the channel state information is difficult to estimate and obtain, which makes it difficult to estimate the signal-to-noise ratio. Therefore, the traditional adaptive modulation scheme based on the signal-to-noise ratio is not suitable for the actual underwater acoustic communication system.

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
  • Underwater acoustic communication adaptive modulation algorithm based on steady-state mean square error
  • Underwater acoustic communication adaptive modulation algorithm based on steady-state mean square error
  • Underwater acoustic communication adaptive modulation algorithm based on steady-state mean square error

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0096] The present invention will be further described below in conjunction with the accompanying drawings and simulation experiments.

[0097]The system simulation parameters are set as follows: Assume that the length of the transmitted information sequence is 1000 bits, the carrier frequency is 12kHz, the underwater acoustic channel is obtained using the BELLHOP model, the sending end and the receiving end are located at a depth of 10m below the sea surface, and the wave height is 0.6m. The distance from the receiving end is 100m. The modulation mode is set to four modes of BPSK, 4QAM, 8QAM and 16QAM.

[0098] The SNR estimation based on SMSE and data fitting is as follows: First, the validity of SMSE-based estimation of SNR is verified, and the corrected estimated value, the uncorrected estimated value and the actual SNR are compared. When the modulation mode is BPSK, the simulation results are as follows Figure 5 As shown, the result verifies that the relationship betwe...

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 an underwater acoustic communication adaptive modulation algorithm based on a steady-state mean square error which is particularly suitable for the actual underwater acoustic communication system and can effectively improve the transmission stability of the communication system. The underwater acoustic communication adaptive modulation algorithm based on the steady-state mean square error is characterized in that a transmitting end firstly transmits signals to build connection with a receiving end, received signals are processed, and the mean square error SMSE is acquired and converted to an SNR; and the SNR is then fed back to the transmitting end for adaptive selection on a modulation mode. In comparison with the prior art, the state information of an underwater acoustic channel does not need to be assumed to be known, the blind equalization-based output SMSE realizes adaptive adjustment of the modulation mode, the index takes into account the influence of different underwater acoustic channels on the detection performance, and the tap length of a blind equalizer can be adaptivelyadjusted according to the specific underwater acoustic channel.

Description

Technical field: [0001] The present invention relates to the technical field of underwater acoustic communication, in particular to an underwater acoustic communication system based on steady-state mean square error, which is especially suitable for actual underwater acoustic communication systems, can effectively improve the transmission reliability of the communication system, and does not need to assume that the channel state information is known. Adaptive modulation algorithm for acoustic communication. Background technique: [0002] Spatiotemporally varying multipath and limited bandwidth impose significant constraints on the achievable throughput of communication systems. Non-adaptive link transmission In order to ensure that the system is in acceptable performance, the system is generally only designed for the worst channel conditions, which leads to the underutilization of channel capacity. Especially for the underwater acoustic environment, the underwater acoustic ...

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): H04L1/00H04L25/03H04B11/00H04B13/02
CPCH04B11/00H04B13/02H04L1/0003H04L25/03089
Inventor 刘志勇白帆谭周美
Owner HARBIN INST OF TECH AT WEIHAI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap