Unlock instant, AI-driven research and patent intelligence for your innovation.

An ocdm underwater acoustic communication method based on index modulation

A technology of index modulation and underwater acoustic communication, which is applied in multiplexing communication, ultrasonic/sonic/infrasonic transmission system, electrical components, etc., and can solve problems such as peak-to-average power ratio, weakening inter-symbol interference, and sensitivity to phase difference. Achieve the effect of making up for the decline in data rate and improving the system's anti-frequency shift performance

Active Publication Date: 2022-06-21
RES & DEV INST OF NORTHWESTERN POLYTECHNICAL UNIV IN SHENZHEN +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Orthogonal Frequency Division Multiplexing (OFDM) technology has high frequency band utilization and can effectively weaken the inter-symbol interference (Inter Symbol Interference, ISI) caused by the multipath effect of the channel, but OFDM also has Susceptible to channel time-varying and frequency attenuation, high peak-to-average power ratio, and sensitivity to phase difference.
These shortcomings lead to poor performance of OFDM modulation in underwater acoustic channels with obvious frequency deviation and multipath

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
  • An ocdm underwater acoustic communication method based on index modulation
  • An ocdm underwater acoustic communication method based on index modulation
  • An ocdm underwater acoustic communication method based on index modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0037] refer to figure 1 The specific process of the OCDM underwater acoustic communication system based on index modulation proposed by the present invention is as follows:

[0038] Step 1: It is determined that the number of single symbol subcarriers is N, the index modulation order is M, the phase modulation order is M1, and the frequency domain interval is F.

[0039] Step 2: Convert the serial data stream to be transmitted serially to parallel, the length of each group of data is bits

[0040] Step 3: Refer to figure 2 shown, log 2 The M-bit data is used for the selection of the index position of the activated sub-carriers, that is, one sub-carrier is activated from M sub-carriers as the activated sub-carrier carrying the phase information, and then log 2 The M1-bit data adopts MPSK phase modulation to carry the phase information on the activated subcarriers. Therefore, after each group of data is modulated, the number of sub-carriers activated by a single symbol i...

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 provides an OCDM underwater acoustic communication method based on index modulation, which combines space modulation technology with OCDM, and uses the index position of silent sub-carriers to carry information while activating sub-carriers to transmit phase modulation information. The present invention reduces the number of effective sub-carriers in the OCDM communication system, thereby reducing the interference between sub-carriers. At the same time, because the silent sub-carriers also carry information, the data rate loss caused by the reduction of the number of factor carriers is compensated. The present invention utilizes active sub-carriers The carrier index position carries information, which makes the communication system improve the anti-frequency shift performance due to the reduction of the number of effective sub-carriers compared with OCDM, and at the same time compensates for the decrease in data rate caused by the reduction of the number of effective sub-carriers.

Description

technical field [0001] The present invention relates to the field of underwater acoustic communication, more particularly, to an OCDM underwater acoustic communication method based on index modulation. Background technique [0002] With the development of human marine undertakings, the requirements for the development of underwater information transmission technology are also increasing day by day. As we all know, electromagnetic waves cannot be transmitted over long distances underwater, so underwater acoustic communication technology is currently the only reliable method for long-distance wireless underwater information transmission. However, compared with other communication channels, the underwater acoustic channel is considered to be one of the most challenging channels in the field of communication due to its severe multipath spread, delay spread and Doppler effect, as well as various fading characteristics caused by it. one. [0003] Orthogonal Frequency Division Mu...

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): H04L27/26H04J14/00H04B11/00H04B13/02
CPCH04J14/005H04B13/02H04B11/00
Inventor 何成兵张晓洋张阳史文涛戴祥飞吴新宇
Owner RES & DEV INST OF NORTHWESTERN POLYTECHNICAL UNIV IN SHENZHEN