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Direct broadcast satellite variable coding modulation and self-adaptive coding modulation hybrid working method

An adaptive coding and coding modulation technology, which is applied in the direction of pulse modulation TV signal transmission, TV, electrical components, etc., can solve the problem of single working mode of the forward link, so as to improve the transmission efficiency, optimize the use of satellite frequency resources, The effect of refining coverage requirements

Inactive Publication Date: 2010-10-13
ACAD OF BROADCASTING SCI SARFT
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Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a method for the hybrid operation of direct broadcast satellite variable coding and modulation and adaptive coding and modulation, in order to solve the problem of single forward link working mode in the prior art

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  • Direct broadcast satellite variable coding modulation and self-adaptive coding modulation hybrid working method

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Embodiment Construction

[0019] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.

[0020] In the method described in the embodiment of the present invention, the ABS-S signal transmission can be used to flexibly configure the transmission structure of the next frame of data according to requirements, change the code rate and modulation mode of the next frame of data, and realize the VCM and ACM working modes. figure 1 Shown is the ABS-S transmission signal configuration structure. By configuring the NFCT field in it, the modulation method and error correction code coding rate adopted by the next physical frame of the current transmission signal can be quickly indicated. figure 2 The structure of the NFCT field is shown, from which it...

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Abstract

The invention discloses a direct broadcast satellite variable coding modulation and self-adaptive coding modulation hybrid working method, which comprises: a step A, in which a front-end system changes the modulation mode and code rate of a frame of data dynamically during program transmission according to program content transmission needs and thus a variable code rate modulation working mode is realized; and a step B, in which the front-end system, in the variable code rate modulation working mode, changes the variable code rate modulation working mode into a self-adaptive coding modulation working mode when acquiring the current system signal-to-noise ratio of a user. In the invention, based on the real-time variable characteristic of a transmission frame structure in a direct broadcast satellite system and the combination of the respective advantages of both the variable code rate modulation working mode and the self-adaptive coding modulation working mode, the utilization of satellite frequency resources is further optimized, the coverage requirements of the satellite broadcast systems are detailed, and the transmission effectiveness of the direct broadcast satellite system is improved.

Description

technical field [0001] The invention relates to the technical field of digital television broadcasting, in particular to a method for mixed work of direct broadcast satellite variable coding modulation and self-adaptive coding modulation. Background technique [0002] Satellite bandwidth resources are the most valuable resources in the entire satellite system. Any satellite system hopes to transmit as much data or carry out as many services as possible in limited satellite bandwidth resources, and also hopes to realize broadcasting service and Internet service in one transponder at the same time. [0003] In ABS-S (Direct Broadcast Satellite System), three working modes are adopted in the forward link, including: 1. CCM (fixed code modulation technology); 2. VCM (variable code rate modulation technology); 3. ACM ( Adaptive coding and modulation technology). Among them, especially the two technologies of variable code rate modulation and adaptive coding and modulation can g...

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Application Information

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IPC IPC(8): H04N7/24H04N7/64H04N7/20H04N19/89
Inventor 施玉海杨明
Owner ACAD OF BROADCASTING SCI SARFT
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