Apparatus and method for hierarchical modulation and apparatus and method for hierarchical demodulation

A technology of hierarchical modulation and modulation method, applied in the field of bit mapping technology and hierarchical demodulation, which can solve problems such as deterioration of reception performance, complex hardware configuration, errors, etc., and achieve the effect of minimizing the reduction of reception performance

Inactive Publication Date: 2010-08-04
ELECTRONICS & TELECOMM RES INST
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the receiving device incorrectly determines the HP stream, an error is caused in estimating channel distortion, and the error in estimating channel distortion degrades reception performance
Also, since the receiving device performs decision-based channel estimation, the hardware configuration becomes complicated

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
  • Apparatus and method for hierarchical modulation and apparatus and method for hierarchical demodulation
  • Apparatus and method for hierarchical modulation and apparatus and method for hierarchical demodulation
  • Apparatus and method for hierarchical modulation and apparatus and method for hierarchical demodulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] In the following detailed description, only certain exemplary embodiments of the present invention have been shown and described, simply by way of illustration. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not restrictive. The same reference numerals denote the same elements throughout the description.

[0028] It will be further understood that the terms "comprises" and / or "comprising" when used in this specification indicate the presence of stated features, integers, steps, operations, elements, and / or components , but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. In addition, the terms -er, -or, module, and block described in the specifica...

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

An apparatus for hierarchical modulation generates a first hierarchical symbol sequence by mapping a first hierarchical bit sequence corresponding to an information bit sequence into a bit position in a first signal constellation according to a first modulation method. Further, the apparatus for hierarchical modulation generates a second hierarchical symbol sequence by mapping a second hierarchical bit sequence corresponding to an additional information bit sequence into a bit position in a second signal constellation according to a second modulation method and then phase-rotating the second hierarchical bit sequence as much as the phase of each first hierarchical symbol. The apparatus for hierarchical modulation generates a hierarchical modulating symbol sequence by adding up symbols in the generated second hierarchical symbol sequence and symbols in the first hierarchical symbol sequence.

Description

technical field [0001] The present invention relates to a device and method for hierarchical modulation and a device and method for hierarchical demodulation. More specifically, the present invention relates to a bit mapping technique in a signal constellation diagram based on the modulation method. [0002] This work was supported by the IT R&D program of MIC / IITA [2006-S-016-02, Development of Distributed Translator Technology for Terrestrial DTV]. Background technique [0003] With the advent of digital broadcasting, various broadcasting services have been provided per mass media. OFDM (Orthogonal Frequency Division Multiplexing), which is a modulation method used in terrestrial digital broadcasting, is mainly used for communications such as high-speed wired / wireless communications because it has high spectral efficiency and strength in fading channels. [0004] Currently, digital broadcasting systems use a hierarchical modulation method in which the modulation method i...

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): H04L27/34
CPCH04L27/183H04L27/3483H04L27/3488H04L27/2601H04L5/005H04L27/34
Inventor 林炯秀金成勋金兴默林钟秀李寿寅
Owner ELECTRONICS & TELECOMM RES INST
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