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Hierarchical modulation type 32APSK planisphere design method

A layered modulation and design method technology, applied in the modulation carrier system, digital transmission system, electrical components, etc., to achieve the effect of improving the performance threshold of demodulation and decoding, and easy to deal with

Inactive Publication Date: 2018-04-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To achieve such a configuration, the traditional constellation diagram is no longer applicable and a specific constellation map must be used

Method used

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  • Hierarchical modulation type 32APSK planisphere design method
  • Hierarchical modulation type 32APSK planisphere design method
  • Hierarchical modulation type 32APSK planisphere design method

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Embodiment Construction

[0018] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0019] One, such as figure 1 As shown in the basic structure of the present invention, the constellation points are distributed on three concentric circles, the first circle has 4 constellation points; the second circle has 12 constellation points, and the ratio of the radius of the second circle to the radius of the first circle is γ 1 =R 2 / R 1 ; There are 16 constellation points in the third circle, and the ratio of the radius of the third circle to the radius of the first circle is γ 2 =R 3 / R 1 . The constellation points in the same quadrant move closer to the bisector of the angle between the coordinate axes of the quadrant, forming a sector with an angle of 2θ, and the constellation points in the same quadrant are evenly distributed in the same circle.

[0020] Each constellation symbol is mapped to five bits, and the quadrant where the conste...

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Abstract

The invention provides a hierarchical modulation type 32APSK planisphere design method, which can be applicable to 32-order APSK hierarchical modulation systems. The method comprises the following steps: step 1, constellation point arrangement: allocating 32 constellation points in three concentric circles with different radiuses in a two-dimensional plane, wherein 4 constellation points are allocated in the first circle, and 1 constellation point is allocated in each quadrant, 12 constellation points are allocated in the second circle and 3 constellation points are allocated in each quadrant,16 constellation points are allocated in the third circle and 4 constellation points are allocated in each quadrant, the constellation points in the same circle are not uniformly distributed in a 360-degree plane, and the coordinate axes of different quadrants are symmetrical; step 2, on the basis of the arrangement of the constellation points in step 1, determining the positions of the constellation points in the plane; and step 3, on the basis of the planisphere obtained in step 2, determining mapping codes of the constellation points in the modulation to obtain an optimal mapping code set,namely a complete planisphere.

Description

technical field [0001] The invention relates to the field of layered modulation and constellation diagram design in broadband satellite digital video broadcast communication, and is especially suitable for layered modulation multi-service transmission systems that need to suppress attenuation factors such as rain attenuation. Background technique [0002] In traditional satellite digital video broadcast communication, strategies such as adaptive coding and modulation are used to suppress the attenuation of signal transmission such as rain attenuation. In layered modulation, a traditional data symbol is divided into multiple layers, and each layer carries different services or provides different protection levels. When the channel condition is good, the receiver can receive all the services, and when the channel condition is poor, the receiver preferentially receives the high-priority service with a lower decoding threshold, so that the communication will not be completely in...

Claims

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Application Information

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IPC IPC(8): H04L27/34
CPCH04L27/3427H04L27/3483H04L27/3494
Inventor 何睿杨德伟王华匡镜明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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