Method and system for efficiently restraining large peak-to-average power ratio (PAPR) of OFDM system based on companding

A technology of average power and average power, which is applied in the field of effectively suppressing large peak-to-average power ratios and systems in OFDM systems based on companding. distribution, etc.

Inactive Publication Date: 2010-06-23
NO 50 RES INST OF CHINA ELECTRONICS TECH GRP
View PDF0 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As μ increases, this improvement becomes more and more obvious, but due to the companding curve characteristics of the traditional companding transformation function, it is not enough for the compression of very large signals and the expansion of very small signals, so the data symbols after companding transformation cannot presents a uniform and tight distribution
Although the inverse companding transform can basically restore the received signal, because the average power of OFDM sy

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
  • Method and system for efficiently restraining large peak-to-average power ratio (PAPR) of OFDM system based on companding
  • Method and system for efficiently restraining large peak-to-average power ratio (PAPR) of OFDM system based on companding
  • Method and system for efficiently restraining large peak-to-average power ratio (PAPR) of OFDM system based on companding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0088] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0089] An embodiment of a method for effectively suppressing a large peak-to-average power ratio of an OFDM system based on companding

[0090] image 3 The flowchart of an embodiment of the method for effectively suppressing the large peak-to-average power ratio of the OFDM system based on companding in the present invention is shown. See image 3 , the following is a detailed description of each step in the method. The method of this embodiment includes the process of companding and transforming the OFDM signal at the transmitting end (steps S100-S103) and the process of restoring the companded OFDM signal at the receiving end (steps S104-S108).

[0091] Step S100: For the time-domain sampling sequence {x of the OFDM system n} to calculate the average amplitude V of the OFDM signal in the time domain.

[0092] The time-domain sampling sequence ...

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 and a system for efficiently restraining large PAPR of OFDM system based on companding, wherein the PAPR is debased and the error rate is reduced. The invention is characterized in that the invention provides a companding method for reducing the probability of generating large PAPR based on hyperbolic asymptote companding function by analyzing the fundamental reasons to the PAPR problem in the OFDM system and the factors of generating low probability of large PAPR, starting compressing time-domain large signal, enlarging time-domain dwarf signal and limiting super-large signal in combination with the advantages of amplitude limiting and companding. The invention is applied to OFDM system.

Description

technical field [0001] The invention relates to the problem of peak-to-average power ratio in an OFDM communication system, in particular to a nonlinear companding method and system for effectively suppressing a large peak-to-average power ratio of the OFDM system. Background technique [0002] Orthogonal frequency division multiplexing OFDM technology is considered to be one of the core technologies of the fourth generation mobile communication 4G because of its efficient spectrum utilization and good anti-multipath fading performance. At present, OFDM technology has been used in asymmetric digital subscriber line ADSL , digital audio broadcasting DAB and digital TV broadcasting DVB, IEEE 802.11, IEEE 802.16 and power line broadband data communication have been widely used. [0003] The basic principle of OFDM is to distribute high-speed data streams to several sub-channels with relatively low transmission rates for transmission through serial-to-parallel conversion. Since...

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
IPC IPC(8): H04L27/26H04B7/005
CPCY02D30/70
Inventor 周云峰
Owner NO 50 RES INST OF CHINA ELECTRONICS TECH GRP
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