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Method and device for mapping/de-mapping constellation as well as linear transformation constellation map

A technology of constellation diagram and mapping method, applied in the field of digital information transmission, can solve the problems of not improving performance, not improving the Euclidean distance of constellation points on the constellation diagram, etc.

Inactive Publication Date: 2008-11-05
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique has been shown to not improve the performance of the system in Gaussian channels because it does not improve the Euclidean distance of the constellation points on the constellation map

Method used

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  • Method and device for mapping/de-mapping constellation as well as linear transformation constellation map
  • Method and device for mapping/de-mapping constellation as well as linear transformation constellation map
  • Method and device for mapping/de-mapping constellation as well as linear transformation constellation map

Examples

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no. 1 example

[0033] Such as figure 2 As shown, the linear constellation conversion device at the transmitting end includes a mapper, a first random interleaver, and a linear constellation converter connected in sequence, and the mapper is figure 1 The mapper in , that is to say, a random interleaver and a linear constellation converter are added after the original mapper.

[0034] A mapper, configured to map the coded information bit stream according to the constellation map of the first mapping method, the first mapping method may be natural mapping or Gray mapping or other mapping methods, wherein image 3 with Figure 4 Constellation diagrams for 64QAM natural mapping or Gray mapping are shown, respectively.

[0035] a first random interleaver, configured to randomly interleave the output signal of the mapper;

[0036] The linear constellation converter is configured to perform linear constellation transformation on the randomly interleaved signal stream, and output the signal strea...

no. 2 example

[0067] In the previous embodiment, the constellation mapping in the mapping mode of the present invention is obtained by adding linear transformation on the basis of the original mapping, which can be used for upgrading existing equipment and improves the compatibility of the present invention. However, in this embodiment, the constellation map mapping of the present invention is directly adopted.

[0068] The constellation mapping device of this embodiment (corresponding to figure 1 mappers in ) include:

[0069] The storage module is used to save the corresponding relationship information between constellation points and codewords on the constellation diagram satisfying that the value of G(α·d+β·D) is smaller than the set threshold.

[0070] A mapping module, configured to map the coded and interleaved bit stream to a constellation map based on the configured correspondence information.

[0071] The corresponding constellation mapping method is:

[0072] The coded and int...

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Abstract

The invention discloses a constellation mapping de-mapping and the linear transformation planisphere mapping de-mapping method and the device, wherein the planisphere mapping method includes: performing the planisphere mapping to the coded and interweaved stream of bits according to planisphere satisfying G(alpha*d+ beta*D) smaller than the given threshold, mapping the code word onto the corresponding constellation point, transmitting the output signal flow after the post-treatment, wherein G is the cost function, d is the statistical value of the smallest euclidean distance of the input code word set, D is the statistical value of the smallest Hamming distance of the input code word set, alpha and beta are the weight coefficients which are selected according to the characteristics of the practical channel. The invention causes the modulation demodulation system to obtain the compromise between the receptivity of the gaussian channel and the fading channel, namely causes the modulation demodulation system to have the satisfying receptivity below the gaussian channel and the fading channel and other channels therebetween.

Description

technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to a constellation mapping demapping method and a linear transformation constellation mapping demapping method and device. Background technique [0002] In communication systems, the commonly used modulation methods such as QPSK (Quadrature Phase-ShiftKeying), 16QAM (Quadrature Amplitude Modulation, Quadrature Amplitude Modulation) and 64QAM generally use natural mapping or Gray mapping. In order to obtain better demodulation performance under Gaussian channel. However, it has been proved in theory that the optimal mapping method under the Gaussian channel cannot provide the optimal demodulation under the wireless fading channel. [0003] The Chinese patent with the publication number CN1430353 and titled "Constellation Mapping Cascade Error Correction Coding Method with Maximized Minimum Euclidean Distance" discloses a method of combining convoluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34H04L1/06H04L1/00
Inventor 黄晓
Owner VIMICRO CORP
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