Check patentability & draft patents in minutes with Patsnap Eureka AI!

A Papr Suppression Method of Ofdm System Based on Wavelet Transform

A technology of wavelet transform and modulation method, which is applied in the field of mobile communication, can solve the problems of reducing PAPR value and unsatisfactory improvement effect, and achieve the effect of suppressing PAPR

Active Publication Date: 2021-07-27
XIDIAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the methods nowadays are based on the IFFT / FFT transformation to carry out subsequent algorithm improvements to reduce the PAPR value. Without the root cause, the improvement effect is not ideal.

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
  • A Papr Suppression Method of Ofdm System Based on Wavelet Transform
  • A Papr Suppression Method of Ofdm System Based on Wavelet Transform
  • A Papr Suppression Method of Ofdm System Based on Wavelet Transform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The invention is further described below with reference to the accompanying drawings.

[0035] A wavelet transform based OFDM system PAPR suppression method, including the following steps:

[0036] 1) Select the appropriate sub-carrier number n and modulation mode, the modulation method is 16QAM modulation;

[0037] 2) Generate a random matrix X, then perform 16QAM modulation of the random matrix X to obtain a mapping matrix X, while generating a random vector of XF1;

[0038] 3) The IFFT transform is performed and the different wavelet is used for IDWT transformation. The method samples 5000 point power level values, resulting in a distribution of the PAPR value of 5,000 points:

[0039] 1 For the XF and XF1 for IFFT transformation, obtain the transformed plurality of XT1, then calculate the XT1 according to the formula, the specific formula is:

[0040]

[0041] Among them, XT1 is the X of the formula. t ;

[0042] 2 Change the orthogonal branch, use a wavelet orthogona...

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

A wavelet transform-based PAPR suppression method for OFDM systems. The method is based on IDWT transform, setting two-point thresholds, and using weighting to calculate a new sequence of clipping techniques. The decomposition and reconstruction under different wavelets and the use of new clipping techniques are verified by simulation. performance of the PAPR obtained after the web technique. By comparison, the method of the present invention has a significant improvement in the effect of reducing the PAPR value compared with the improved algorithm in IFFT / FFT technology and the basic clipping technology based on wavelet transform that only sets a threshold.

Description

Technical field [0001] This method belongs to the field of mobile communication, specifically, the data transmission of the OFDM system is achieved after the DWT of the orthogonal group replaces the traditional FFT of the orthogonal group. Background technique [0002] With the rapid development of mobile communication systems, the reliability of wireless high-speed data transmission is increasingly important, and the technology has also put forward higher requirements. Orthogonal Frequency Division (OFDM, ORTHOGONAL FREQUENCYDIVISION MULTIPLEXING) is considered to be a very effective means of achieving high speed data transmission. It utilizes many parallel, low-rate data transmission subcarriers to implement a high-rate data communication, with high spectrum utilization, strong anti-min arms interference (ICI, Inter-Carriers Interference) and symbolic interference (ISI , Inter-Symbol Interference capabilities. [0003] The wavelet analysis is based on a multi-resolution analysi...

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): H04L27/34H04L27/36
CPCH04L27/3411H04L27/362
Inventor 杨刚骆要叶新泉
Owner XIDIAN UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com