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Channel encoding modulation method adopting hierarchial block product code

A technology of channel coding and modulation method, which is applied in the field of multi-layer block product code error correction coding and modulation, which can solve the problems of few priorities, poor error correction performance of convolutional codes, complex implementation, etc., and achieve strong error correction ability and priority Multiple, simple effects

Inactive Publication Date: 2002-02-13
TSINGHUA UNIV
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Problems solved by technology

[0017] The disadvantage of the above-mentioned method is: the modulation adopts 16QAM, so the implementation is complicated, and because there are only two layers of modulation, the priority is less, so it cannot meet the requirements of various services; in addition, the hierarchical 64QAM in European DVB-T The previous error correction codes used convolutional codes, and the error correction performance of convolutional codes was poor, resulting in reduced reliability.

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  • Channel encoding modulation method adopting hierarchial block product code
  • Channel encoding modulation method adopting hierarchial block product code
  • Channel encoding modulation method adopting hierarchial block product code

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Embodiment Construction

[0048] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] According to the characteristics of digital communication transmission and digital TV broadcasting, the present invention proposes an embodiment of a channel coding modulation method using a multi-level block product code (Multi-level Block Product Code), which can achieve priority transmission information and meet various Various priority service needs, and the purpose of better service coverage.

[0050] The flow process of the present embodiment method is as follows Figure 6 As shown, it includes: the input data streams of three different priorities (high, medium, and low) respectively pass through their respective block product code BPC (3762, 2992) encoders to obtain the block product code stream, and the According to the definition, the block product code stream is respectively mapped to different bits of the constellation diagr...

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Abstract

The present invention relates to the field of digital information transmission technology. The hierarchical block product code (BPC) error correcting, encoding and modulation method includes: coding the input data code stream with different priority level in separate BPC code to obtain BPC stream, mapping the BPC stream based on definition to different bits of planisphere symbol of set modulationmode to obtain hierarchical modulation signal output with different antijamming capability. The present invention has the advantages of simple embodiment, more priority levels, powerful error correcting capacity and high reliability, and may be used in ground digital TV broadcasting system and other fields.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and relates to a multi-level block product code (Multi-level Block Product Code) error correction encoding modulation method, and more specifically relates to a multi-level block product code error correction encoding modulation in a terrestrial digital television broadcasting system method. Background technique [0002] In digital information transmission, no matter what type of channel the signal is transmitted through, due to the influence of attenuation, distortion and various interferences, there will be bit errors in the received data. Therefore, any actual digital communication system needs to adopt channel coding modulation technology for error correction. Generally, the Forward Error Correction (FEC) method is used, which is to add extra symbols to the data according to certain rules at the sending end. , forming an error-correcting code with error-correcting ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/015H04N7/24
Inventor 杨林杨知行
Owner TSINGHUA UNIV
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