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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, can solve the problems of deterioration of reception performance, complex hardware configuration, errors, etc., and achieve the effect of minimizing the reduction of reception performance

Inactive Publication Date: 2013-12-04
ELECTRONICS & TELECOMM RES INST
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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

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Embodiment Construction

[0029] 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.

[0030] 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...

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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...

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Application Information

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Patent Type & Authority Patents(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
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