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Constellation mapping method

A technology of constellation mapping and constellation diagram, which is applied in the field of digital information coding and transmission, can solve problems such as the absence of an ideal solution, and achieve the effects of improving hard decision capabilities, eliminating inter-subcarrier interference, and improving channel estimation

Inactive Publication Date: 2014-02-05
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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Problems solved by technology

[0006] On the other hand, for the receiving end, it is necessary to perform constellation demapping from the received constellation symbols to obtain the demapped bit soft information. For each constellation point on the constellation diagram, the bit soft information corresponding to the constellation point is determined by hard decision. information, so higher requirements are placed on the accuracy of transmission channel estimation and the reduction of inter-subcarrier interference, but there is no ideal solution in the prior art

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Embodiment 1

[0033] The input bit data is multiple sets of bit vectors with a length of M, and the constellation symbols obtained after mapping the bit data through an irregular constellation mapping method are output as real number vectors with a length of N. For example, the input kth bit vector is X k =[b k，0 , b k，1 ,...,b k，M-1 ], the output kth real vector is Y k =[y k，0 、y k，1 ,...,y k，M-1 ]. In this example, the X k map to Y k , so you can use a from {0,1} M to R N To describe the function F, where {0,1} M Represents an M-dimensional bit vector, which is represented by 0 and 1, such as 0011 (M=4), 0100010 (M=6), etc., R N Represents an N-dimensional real number vector, R is the Euclidean distance between the constellation point and the center of the constellation diagram, and R is a real number.

[0034] Among them, the function F satisfies the following two conditions:

[0035] 1. The function F will at least two different {0,1} M The vector in R maps to N The sa...

Embodiment 2

[0042] This embodiment is the same as the irregular constellation mapping method adopted in the first embodiment above, the difference is that in this embodiment, the function F will be {0,1} M map to R N Among them, M=6, N=2.

[0043] Such as figure 2 Shown is a constellation mapping diagram of a specific embodiment of a constellation mapping method.

[0044] refer to figure 2 , the function F maps [0, 0, 0, 0, 0, 0] to [-6.5, 6.5], where two -6.5 and 6.5 correspond to figure 2 The abscissa and ordinate in .

[0045] From figure 2 As can be seen in the function F maps [0, 0, 0, 0, 1, 0] and [0, 0, 0, 0, 1, 1] to the same constellation point (ie [-1, 6.5]) superior. Function F takes [0, 1, 1, 0, 1, 0], [0, 1, 0, 0, 1, 0], [0, 1, 1, 0, 1, 1] and [0, 1, 0, 0, 1, 1] are mapped to the same constellation point (ie [-1, 1]).

[0046] At the same time, the closest constellation point to [-6.5, -6.5] (including [-6.5, -5] and [-5, -6.5]) has a Euclidean distance of 1.5,...

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Abstract

Provided is a constellation mapping method. The constellation mapping method comprises the step that mapping is carried out on bit data in an irregular constellation mapping mode to obtain constellation symbols, wherein the irregular constellation mapping mode meets the following conditions that (1) at least two different pieces of the bit data are mapped to the same constellation symbol; (2) at least one first constellation symbol and one second constellation symbol exist in a set of constellation symbols so that the minimum value of the Euclidean distances between all the constellation symbols and the first constellation symbol can be different from the minimum value of the Euclidean distances between all the constellation symbols and the second constellation symbol, wherein the minimum value is larger than zero. According to the technical scheme, Shaping gain of a communication system is improved, channel estimation is improved, and inter-subcarrier interference is eliminated.

Description

[0001] technical field [0002] The invention relates to the field of digital information encoding and transmission, in particular to a constellation mapping method. Background technique [0003] Constellation mapping refers to mapping a bit sequence carrying digital information into a symbol sequence suitable for transmission. Constellation mapping includes two elements, namely constellation diagram (constellation) and constellation point mapping (Labeling) method. Wherein, the constellation diagram represents a set of all values ​​of the output symbols of the constellation map, and each point in the constellation diagram corresponds to a value of the output symbols. The constellation point mapping method represents the specific mapping relationship between input bits or bit groups to constellation points, or the specific mapping relationship between constellation points and bits or bit groups. Usually, each constellation point corresponds to a bit or a bit group composed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 张文军管云峰史毅俊何大治尧勇仕李虎
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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