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

Identification Method of Broadband Signal Modulation

A modulation method and wideband signal technology, applied in modulation type identification, modulation carrier system, baseband system, etc., can solve the problems of poor system real-time performance and large amount of calculation, and achieve easy programming, simple algorithm, and small amount of calculation. Effect

Active Publication Date: 2021-07-13
NANJING UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the statistical pattern recognition method is that it does not need to calculate the threshold value in advance, and there is no problem of the sequence of using the characteristic parameters. The disadvantage is that the real-time performance of the system is not good and the calculation amount is large

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
  • Identification Method of Broadband Signal Modulation
  • Identification Method of Broadband Signal Modulation
  • Identification Method of Broadband Signal Modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0072] 1) Simulation conditions:

[0073] All modulated signals to be identified are simulated through the MATLAB program, and the main simulation parameters are: carrier frequency f c =150kHz, sampling frequency f s =1200kHz, digital signal baseband waveform adopts rectangular pulse, symbol rate r b =12.5kbit / s, the number of sampling points for each identification sample is 2048. The signal-to-noise ratio is 5dB, 10dB, 15dB and 20dB, and each signal is simulated 2000 times under the same signal-to-noise ratio.

[0074] After a large number of simulation comparisons, referring to Table 1, the characteristic parameter judgment threshold value in the recognition algorithm is given.

[0075] Table 1 Threshold value of each characteristic parameter under different SNR

[0076]

[0077] like figure 2 shown, using N 1 The value of is compared with the threshold value to distinguish the analog modulation signal from the digital modulation signal. Then make an in-depth com...

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 discloses a method for identifying modulation modes of broadband signals, comprising the following steps: performing blind estimation on the received signal to obtain the instantaneous frequency, amplitude, phase and carrier frequency of the received signal; adopting a hypothesis testing method based on decision theory combined with spectrum analysis Judging the modulation mode of the received signal: Firstly, distinguish the analog modulation signal and the digital modulation signal according to the nonlinear transformation difference point of the received signal, and then distinguish the AM, FM, DSB, VSB, LSB and USB signals in the analog modulation signal through different characteristic parameters , and ASK, FSK, PSK and QAM signals in digitally modulated signals. The present invention receives various signals in the broadband frequency range, combines the FPGA module to process the baseband signal and extracts the characteristic value to determine the modulation mode and modulation parameters of the broadband signal, and provides a basis for further signal processing and analysis.

Description

technical field [0001] The invention relates to a broadband signal modulation technology, in particular to a method for identifying a broadband signal modulation mode. Background technique [0002] Broadband communication is a radio communication technology that sends radio waves to receivers through the reflection of the ionosphere. Its frequency ranges from 1MHz to 18GHz, and it is mainly used for medium and long-distance communications. The advantages of broadband communication signals are as follows: First, active relays and network hubs in the communication system will not affect the use of broadband communication technology, even in the event of disasters or wars, other communication networks including satellites will Affected, only the broadband communication signal network remains intact. Second, broadband communication signals can be used in remote areas that are not covered by UWB. Third, broadband communication signals are much cheaper to operate than satellite ...

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): H04L27/00H04L25/02
CPCH04L25/0238H04L27/0012
Inventor 秦强张彬超陆锦辉马超
Owner NANJING UNIV OF SCI & TECH