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Non-equal probability constellation labeling method based on absolute phase shift keying (APSK) constellation diagram

A technology of constellation mapping and constellation diagram, which is applied in the field of approximate constellation mapping, can solve the problems that further shaping gains cannot be provided, and non-equal approximate APSK constellation mapping cannot approach the Shannon limit, so as to achieve excellent performance, reduce the threshold of signal-to-noise ratio, and improve performance Effect

Active Publication Date: 2013-04-10
TSINGHUA UNIV +1
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  • Description
  • Claims
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Problems solved by technology

[0005] The present invention provides a non-isoprobable constellation mapping method based on an APSK constellation diagram, which is used to solve the problem that the non-isoprobable APSK constellation map obtained based on the prior art cannot further provide Shaping gain in the case of independent demapping or iterative demapping, thereby The problem that the non-isoprobable APSK constellation mapping obtained by the existing technology cannot approach the Shannon limit

Method used

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  • Non-equal probability constellation labeling method based on absolute phase shift keying (APSK) constellation diagram
  • Non-equal probability constellation labeling method based on absolute phase shift keying (APSK) constellation diagram
  • Non-equal probability constellation labeling method based on absolute phase shift keying (APSK) constellation diagram

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Embodiment 1

[0047] According to the mapping scheme of a 64-order non-isoprobable APSK constellation obtained by the non-isoprobable constellation mapping method based on the APSK constellation diagram described in Embodiment 1 of the present invention, the generating method includes steps:

[0048] S1. Construct an APSK constellation diagram, the constellation mapping order is M, M=2 m , m is a positive integer; the constellation points of each ring are equal, and the phase offset of each ring is also equal;

[0049] Among them, the parameters are selected as follows, assuming that the constellation mapping order M=64, the number of rings R=4, the number of constellation points on each ring is 16, and the phase offset of all rings is π / 16; the radius value of the lth ring is given by formula Calculated; After the average power is normalized, the radii of the first ring to the fourth ring are 0.3818, 0.7164, 1.0348, 1.5067 respectively.

[0050] S2. Designing a constellation mapping met...

Embodiment 2

[0063] According to a scheme of 256-order non-isoprobable APSK constellation mapping obtained by the non-isoprobable constellation mapping method based on the APSK constellation diagram described in Embodiment 2 of the present invention, the generating method includes steps:

[0064] S1. Construct an APSK constellation diagram, the constellation mapping order is M, M=2 m , m is a positive integer; the constellation points of each ring are equal, and the phase offset of each ring is also equal;

[0065] Among them, the parameter selection is as follows, the constellation mapping order M=256, the number of rings R=8, the number of constellation points on each ring is 32, and the phase offset of all rings is π / 32. The radius of the lth ring is given by the formula calculated. After the average power is normalized, the radii of the first ring to the eighth ring are 0.2596, 0.4657, 0.6256, 0.7752, 0.9293, 1.1023, 1.3223, and 1.7018 respectively. Fine-tuning the above radius valu...

Embodiment 3

[0080] A 256-order non-isoprobable constellation mapping scheme obtained according to the non-isoprobable constellation mapping method based on the APSK constellation diagram described in the embodiment of the present invention, the generating method includes the steps:

[0081] S1. Construct an APSK constellation diagram, the constellation mapping order is M, M=2 m , m is a positive integer; the constellation points of each ring are equal, and the phase offset of each ring is also equal;

[0082] Among them, the parameter selection is as follows, the constellation mapping order M=256, the number of rings R=8, the number of constellation points on each ring is 32, and the phase offset of all rings is π / 32. The radius of the lth ring is given by the formula Calculated, after the average power is normalized, the radii of the 1st ring to the 8th ring are 0.2596, 0.4657, 0.6256, 0.7752, 0.9293, 1.1023, 1.3223, 1.7018, fine-tuning the above radius value between 0.9 and 1.1 times ...

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Abstract

Disclosed is a non-equal probability constellation labeling method based on an absolute phase shift keying (APSK) constellation diagram. The non-equal probability constellation labeling method based on the APSK constellation diagram is characterized by comprising the steps that: the APSK constellation diagram is constructed, number of steps of the constellation labeling is M, M=2m, and m is a positive integer, numbers of constellation points on each ring is the same, phase deviations of each ring are also the same; a constellation labeling mode of the APSK constellation diagram is designed, and the constellation labeling mode is enabled to be a gray labeling; the constellation points are grouped, and constellation points on the same ring are combined to be a new constellation point; labeling bits of the prior constellation points on the same ring are distributed to the new constellation point in sequence. According to the non-equal probability constellation labeling method based on the APSK constellation diagram, the inhomogeneous constellation diagram and a non-equal probability labeling technology are adopted, distribution of output signals of the constellation labeling is enabled to be close to Gaussian distribution, shaping gain is achieved, performance of a coded modulation system is improved, and signal to noise ratio in a modulation process is reduced.

Description

technical field [0001] The invention belongs to the technical field of coding and modulation, and in particular relates to a non-isoprobable constellation mapping method based on an APSK constellation diagram. Background technique [0002] With the rapid development of Internet technology and multimedia services, the speed and scale of information collection and dissemination have reached unprecedented levels. Digital communication systems need to transmit more and more information and data, and the requirements for high transmission rates and high transmission reliability are increasing. increase. In digital communication, digital modulation is one of the core technologies to ensure reliable and efficient transmission of digital signals. How to design a modulation scheme with high reliability and high transmission efficiency is a major research hotspot in the field of digital communication. [0003] In digital communications, a sequence of digital bits generated by a sour...

Claims

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Application Information

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IPC IPC(8): H04L27/36H04L1/00
Inventor 杨昉颜克茜宋健薛永林
Owner TSINGHUA UNIV
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