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Deep space exploration multimedia service-oriented independent window unequal protective fountain coding method

A technology for multimedia services and fountain coding, which is applied in the field of protection fountain coding, can solve the problems of time-varying channel signal loss in deep space and cannot guarantee data reliability, etc., and achieves the effect of good picture effect.

Active Publication Date: 2013-10-23
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0003] At the same time, the signal loss and burst errors of deep space time-varying channels make the underlying channel coding unable to guarantee data reliability

Method used

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  • Deep space exploration multimedia service-oriented independent window unequal protective fountain coding method
  • Deep space exploration multimedia service-oriented independent window unequal protective fountain coding method
  • Deep space exploration multimedia service-oriented independent window unequal protective fountain coding method

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] see Figure 1 to Figure 6 , The invention provides a coding method for independent window unequal protection fountains oriented to deep space exploration multimedia services. The present invention selects the code-free fountain code with low encoding and decoding complexity as the LEC unequal protection erasure correction coding scheme for multimedia data packets: firstly, fountain decoding does not require continuous data packets, and adapts to the characteristics of easy interruption of deep space links; Secondly, the fountain code can generate encoding packets "online", which can reduce the complexity of the sending end and the receiving end, and can be combined with the transmission protocol for optimal design; most importantly, the code-free characteristic of the fountain code can approach the Shannon limit with any probability , s...

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Abstract

The invention provides a deep space exploration multimedia service-oriented independent window unequal protective fountain coding method, and coding packages are generated according to the different important levels of information source grouping data. According to the coding scheme of the invention, the asymptotic performance is deduced based on and / or tree analysis technology, the multi-target optimization is performed by utilizing NSGA-II, and optimal parameter sets of unequal protection degree distribution parameters and coding selecting probabilities are obtained. Proved by the simulation contrast of the asymptotic performance of EWF under the same gain, and under the premise of the same decoding spending, the IW-LT scheme is much lower than the EWF scheme in error rate. The multimedia information source coding is enabled to meet the different service demands under the highly dynamic deep space communication environment, and only basis information and less assisting information are received by the limiting selection of the service transmission time delay, or the whole multimedia information is selected to be received to obtain a better picture effect.

Description

technical field [0001] The invention relates to a coding method for independent window unequal protection fountains facing deep space exploration multimedia services. Background technique [0002] With the frequent and in-depth deep space exploration activities of various aerospace powers, the amount of data and business types that need to be transmitted are increasing day by day. The most intuitive and core information of cognition; and in manned space missions, the efficient transmission of voice and video across agencies and mission systems is a necessary guarantee for the smooth progress of the mission and the monitoring of the safety of astronauts. The Consultative Committee on Spatial Data (CCSDS) recommends that for multimedia services such as images and high-resolution videos, discrete wavelet transform should be used as the core, and algorithms that support both lossless and lossy compression can be used to process source information (for example, the Mars explorati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/37
Inventor 张钦宇焦健陈英顾术实于淼吴绍华
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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