Code modulation method and system

A technology of coding modulation and coding bits, which is applied in the field of coding modulation methods and systems, can solve the problems of increased complexity and inability to adapt to the needs of various services, and achieve the goals of improving flexibility, improving the highest throughput, and simplifying bit interleaving technology Effect

Active Publication Date: 2015-04-29
TSINGHUA UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0013] 3. The information bit length of this scheme is constant, which is 4800 bits. Changing the length of the information bit requires redesigning the interleaver, which cannot meet the needs of various servic...

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  • Code modulation method and system
  • Code modulation method and system

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Embodiment Construction

[0048] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present invention, but should not be understood as limiting the present invention.

[0049] The encoding and modulation method and system according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0050] figure 1 It is a flowchart of a coding modulation method according to an embodiment of the present invention. figure 2 It is a schematic flowchart of a coding modulation method according to another embodiment of the present invention. Combine figure 1 with figure 2 As shown, the method includes the following steps:

[0051] Step S1...

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Abstract

The invention provides a code modulation method and system adopting a Raptor-like Irregular QC-LDPC code. The code modulation method includes the steps that the code modulation system receives input information bits; LDPC channel coding is conducted on the information bits according to a check matrix of the Raptor-like Irregular QC-LDPC code to generate coding bits; bit mapping is conducted on the coding bits to obtain mapping bits; constellation mapping is conducted on the mapping bits to obtain constellation mapping symbols, and the constellation mapping symbols pass through an equivalent transmission channel to obtain receiving symbols; bit soft de-interleaving is conducted on extrinsic information of the mapping bits to generate prior information of the coding bits; the prior information of the coding bits is decoded to obtain the extrinsic information of the coding bits; bit soft interleaving is conducted on the extrinsic information of the coding bits to generate the prior information of the mapping bits, and LDPC decoding results are output after multiple iterations. The code modulation method improves the flexibility of a communication system, simplifies a realization method of a channel decoder applied to a variety of services and facilitates improvement of the handling capacity and the expansibility of a code modulation system.

Description

Technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to a coding modulation method and system. Background technique [0002] In the field of communication, channel coding technology is usually used to ensure the effectiveness and reliability of communication in noise and interference channels. For example, in a satellite communication system, due to the influence of geographical and environmental factors, there are a large number of noise sources. These communication channels have their theoretical maximum communication capacity (that is, the Shannon limit of information theory), which can be represented by the bit rate (bps) of a given channel under a specific signal-to-noise ratio (SNR) condition. One of the error control codes close to the Shannon limit is the low-density parity-check code (LDPC). At present, LDPC codes have been widely used due to their error correction performance approaching the Sha...

Claims

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Application Information

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IPC IPC(8): H04L1/00
CPCH04L1/0009H04L1/0023H04L1/0061
Inventor 彭克武刘玥宋健陈霜杨昉
Owner TSINGHUA UNIV
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