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Construction method of multi-dimensional constellation graph, and method and system for code modulation and demodulation and decoding

A construction method and coding and modulation technology, applied in the field of digital information transmission, can solve problems such as complex construction of multi-dimensional Gaussian-like constellations, inability to meet low spectral efficiency, and diversity order restrictions

Active Publication Date: 2011-11-16
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the defects of the existing BICM-ID technology are as follows: the multi-dimensional Gaussian-like constellation diagram is complex in construction; it cannot meet the requirements of low spectral efficiency; the constellation point mapping method is limited; the diversity order is limited by the output symbols; Shaping loss is large

Method used

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  • Construction method of multi-dimensional constellation graph, and method and system for code modulation and demodulation and decoding
  • Construction method of multi-dimensional constellation graph, and method and system for code modulation and demodulation and decoding
  • Construction method of multi-dimensional constellation graph, and method and system for code modulation and demodulation and decoding

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Experimental program
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Embodiment 1

[0119] Embodiment 1 Constructs a 256-point four-dimensional Gaussian-like constellation diagram from a two-dimensional 16APSK constellation diagram:

[0120] This embodiment proposes a method for constructing a 256-point four-dimensional Gaussian-like constellation diagram according to an embodiment of the present invention, the steps of which include:

[0121] A1. Select a two-dimensional 16APSK constellation diagram, such as Image 6 shown.

[0122] The set of all constellation points of the two-dimensional 16APSK constellation diagram is specifically χ 16APSK ={X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8 , X 9 , X 10 , X 11 , X 12 , X 13 , X 14 , X 15 , X 16},in

[0123] x 1 =(x 1 ,y 1 ) = (0.7660, 0.3173) X 2 =(x 2 ,y 2 ) = (-0.3173, 0.7660)

[0124] x 3 =(x 3 ,y 3 ) = (-0.3173, 0.7660) X 4 =(x 4 ,y 4 ) = (-0.7660, 0.3173)

[0125] x 5 =(x 5 ,y 5 ) = (-0.7660, -0.3173) X 6 =(x 6 ,y 6 ) = (-0.3173, -0.7660)

[0126] x 7 =(x 7 ,y 7...

Embodiment 2

[0144] Embodiment 2 constructs 512-point three-dimensional Gaussian-like constellation diagrams from two-dimensional 8APSK constellation diagrams:

[0145] This embodiment proposes a method for constructing a 512-point three-dimensional Gaussian-like constellation diagram according to an embodiment of the present invention, the steps of which include:

[0146] B1. Select a two-dimensional 8APSK constellation diagram, such as Figure 9 shown.

[0147] The set of all constellation points of the two-dimensional 8APSK constellation diagram is specifically χ 8APSK ={X 1 , X 2 , X 3 , X 4 , X 5 , X 6 , X 7 , X 8},in

[0148] x 1 =(x 1 ,y 1 ) = (0.5863, 0.5863) X 2 =(x 2 ,y 2 ) = (-0.5863, 0.5863)

[0149] x 3 =(x 3 ,y 3 ) = (-0.5863, -0.5863) X 4 =(x 4 ,y 4 ) = (0.5863, -0.5863)

[0150] x 5 =(x 5 ,y 5 ) = (0.0000, 1.8200) X 6 =(x 6 ,y 6 ) = (-1.8200, 0.0000)

[0151] x 7 =(x 7 ,y 7 ) = (0.0000, -1.8200) X 8 =(x 8 ,y 8 ) = (1.8200, 0.0000)

[01...

Embodiment 3

[0163] Embodiment 3 adopts the BICM-ID method and system of the multidimensional Gaussian-like constellation diagram:

[0164] This embodiment proposes a BICM-ID method using a multi-dimensional Gaussian-like constellation diagram according to an implementation manner of the present invention. In order to enable the BICM-ID system to provide performance close to Shannon’s limit in AWGN and fading channels at the same time with medium and low spectral efficiency, this embodiment proposes to use a multi-dimensional Gaussian-like constellation in the BICM-1D coded modulation system, and combine the signal Space diversity (SSD) technology, including constellation rotation technology and coordinate interleaving technology.

[0165] The coding and modulation method of the transmitting end of the BICM-ID system includes steps:

[0166] C01. Perform channel coding and bit interleaving on the input information bits to obtain coded and interleaved bits, which are called coded interleav...

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Abstract

The invention discloses a construction method of a multi-dimensional constellation graph, and a code modulation system and a demodulation and decoding system based on the multi-dimensional constellation graph. The multi-dimensional constellation graph is a K-dimensional constellation graph, and the construction method comprises the following steps of: taking M points of a K0-dimensional constellation graph, wherein K0 is less than K; expanding dimensions of the K0-dimensional constellation graph to get a K0L-dimensional constellation graph; performing constellation rotation on the K0L-dimensional constellation graph to get a K0L-dimensional rotated constellation graph; and obtaining the K-dimensional constellation graph from the K0L-dimensional constellation graph. The construction method provided by the invention is simple; the system using the multi-dimensional constellation graph can significantly reduce Shaping loss and improve diversity order of the system so as to obtain diversity gain in a fading channel; and overall performance of a receiving end using the construction method can approach the channel capacity in both low and middle spectrum efficiency and various channel conditions.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a method for constructing a multi-dimensional constellation diagram and an encoding and modulation system and a demodulation and decoding system based on the constellation diagram. Background technique [0002] Constellation mapping is a digital modulation technique. The process of constellation mapping is to map the finite field "bit" sequence carrying digital information into a "symbol" sequence suitable for transmission. The value space of each symbol can be a one-dimensional real number space, a two-dimensional real number space (ie complex number space), or a higher-dimensional real number space. Constellation mapping includes two elements, namely constellation diagram (Constellation) and constellation point mapping method (Labeling). The constellation diagram represents a set of all values ​​of the output symbols of the constellation map, wherein ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/34
Inventor 彭克武程涛杨昉宋健阳辉
Owner TSINGHUA UNIV
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