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Constellation diagram limited extended code modulation method, demodulation and decoding method and system thereof

A technology of extending coding and modulation methods, applied in transmission systems, multi-carrier systems, digital transmission systems, etc., can solve the problem of inability to backward compatible modulation constellation diagrams, and achieve the effect of good Shaping gain and improved diversity order.

Inactive Publication Date: 2010-09-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Due to its strong pertinence, proprietary digital communication systems have been widely used, such as wireless local area network, fixed wireless access, wireless digital audio and video broadcasting and other communication systems, European digital TV terrestrial broadcasting standards and Chinese digital TV terrestrial broadcasting Standards, etc., and the existing modulation and demodulation technologies are all seeking the optimal way to approach the channel capacity, and cannot be backward compatible with the modulation constellation diagram in the original system

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  • Constellation diagram limited extended code modulation method, demodulation and decoding method and system thereof
  • Constellation diagram limited extended code modulation method, demodulation and decoding method and system thereof
  • Constellation diagram limited extended code modulation method, demodulation and decoding method and system thereof

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Embodiment 1

[0072] In order to further demonstrate the performance advantages of the multi-dimensional constellation diagram and backward compatibility of the original system proposed by the present invention, this embodiment proposes a 2D-8APSK extended coding modulation system using backward compatible 16QAM according to an embodiment of the present invention. In this embodiment, the original system adopts 16QAM constellation mapping mode, and the new M-point K-dimensional constellation diagram adopts rotated 2D-8APSK constellation mapping in the spread coding modulation system.

[0073] Such as image 3 Shown is the system block diagram of the 2D-8APSK extended coding modulation system backward compatible with 16QAM in this embodiment, including the following steps:

[0074] S101. Perform channel coding and bit interleaving on the input information bits to obtain coded and interleaved bits;

[0075] S102. Carry out the constellation mapping of the rotated 8-point amplitude phase keyin...

Embodiment 2

[0083] In order to further demonstrate the performance advantage of adopting multi-dimensional constellation diagram and being backward compatible with the original system proposed by the present invention, this embodiment provides a 3D-2PAM extended modulation system adopting backward compatible 64QAM. In this embodiment, the original system adopts 64QAM constellation mapping mode, and the new M-point K-dimensional constellation diagram is adopted in the extended coding modulation system, and the 3D-2PAM constellation diagram is combined with SSD technology at the same time.

[0084] Such as Figure 5 Shown is the block diagram of the 3D-2PAM extended modulation system backward compatible with 64QAM in this embodiment, including the following steps:

[0085] S201. Perform channel coding and bit interleaving on the input information bits to obtain coded and interleaved bits;

[0086] S202. Perform constellation mapping of 3D pulse amplitude modulation on coded interleaving bi...

Embodiment 3

[0099] In order to further demonstrate the performance advantages of the multi-dimensional constellation diagram and backward compatibility with the original system proposed by the present invention, this embodiment provides a 4D-2PAM extended modulation system with backward compatibility with 64QAM. In this embodiment, the original system uses 64QAM as the constellation mapping method, and a new M-point K-dimensional constellation diagram is used in the extended coding modulation system, and the 4D-2PAM constellation diagram is combined with SSD technology at the same time.

[0100] Such as Figure 8 Shown is the block diagram of the 4D-2PAM extended modulation system backward compatible with 64QAM in this embodiment, including the following steps:

[0101] S301. Perform channel coding and bit interleaving on the input information bits to obtain coded and interleaved bits;

[0102]S302. Perform constellation mapping of 4-dimensional pulse amplitude modulation on coded interl...

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Abstract

The invention relates to a constellation diagram limited extended code modulation method, a demodulation and decoding method and a system thereof. The extended code modulation method comprises the following steps: conducting channel coding and bit interleaving to input information bits to obtain coded and interleaved bits; conducting constellation mapping to the coded and interleaved bits by using an M-point K-dimensional constellation diagram to obtain constellation diagram limited K-dimensional extended constellation mapping symbols, wherein M and K are positive integers larger than one; and conducting coordinate interleaving to the K-dimensional extended constellation mapping symbols to obtain extended code modulation symbol output of an N-point constellation diagram in a backward compatible original system, wherein N is a positive integer no less than M. By adopting the novel code modulation method, on the premise that the modulation constellation diagram of the original system isnot changed, the invention has the advantages that the application scope of the original system is expanded and improved, the spectrum utilization is reasonable and the system resources are saved.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a constellation-diagram-limited spread coding and modulation method, a demodulation and decoding method and a system thereof. Background technique [0002] In the past two decades, modern communication technology has developed rapidly, and people's demand for wireless communication services is increasing day by day. The fundamental task of digital communication systems, including typical wireless mobile communication systems and terrestrial digital broadcasting systems, is to use limited bandwidth to provide users with their own Efficient and error-free transmission of information is required. For typical harsh transmission channels with limited power and bandwidth, such as broadband wireless mobile communications and terrestrial digital broadcasting systems, coding and modulation technology is an important guarantee for transmission reliability and syste...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/34
Inventor 杨昉王晓晴宋健王劲涛张彧
Owner TSINGHUA UNIV
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