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Raptor code method of system unequal error protection

An error protection and systematic code technology, applied in the direction of error prevention, transmission system, digital transmission system, etc., to achieve the effect of maintaining excellent decoding performance and increasing the amount of calculation

Inactive Publication Date: 2015-01-28
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology

[0015] The present invention can solve the limitation of the implementation method of the unequal error protection Raptor code in the existing system, fully compatible with the Raptor code codec of the existing standard system on the one hand, and fully utilizes the redundant symbols on the other hand

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited in any form. Based on the embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art through several modifications and improvements without creative efforts all belong to the protection scope of the present invention.

[0045] source symbol sequence (X 1 , X 2 ,...,X K ) length is K. Without loss of generality, r=2 is taken, that is, the source symbol sequence is divided into subsequences of two protection levels: the first category (X 1 1 , X 2 1 ,...,X K1 1 ) and Category 2 (X 1 2 , X 2 2 ,...,X K2 2 ), of which category 1 has a higher level of protection than category 2. The lengths of the sequences of type 1 and type 2 are K1 and K2 respectively, and K1+K2=K. The present invention is the unequal error protection Raptor code encodin...

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Abstract

The invention discloses a Raptor code method of system unequal error protection. The Raptor code method of the system unequal error protection solves the problems that an existing Raptor code method of the system unequal error protection either modifies degree distribution and structure of standard system Raptor codes and damages code word performance, or uses a standard system Raptor encoder to distribute different amounts of redundancy (code rate) for different important data and causes difficulty and waste of redundancy data distribution. According to the Raptor code method of the system unequal error protection, coding is performed based on a standard system Raptor coding algorithm, an algorithm similar to window extension is used for a middle symbol, the unequal error protection for a source symbol is achieved, decoding is performed by only slightly modifying a generation matrix, and a standard system Raptor decoder is still used. The Raptor code method of the system unequal error protection has the advantages of being achieved completely through standard system Raptor code stepping coding and decoding, especially performing the increment decoding according to the classification of the protected degree of the source symbol, and simultaneously maintaining the advantages of original degree distribution, high efficiency of coding and decoding and the like of the standard system Raptor encoder and the standard system Raptor decoder, and achieving the high efficiency unequal error protection.

Description

technical field [0001] This application relates to a Raptor code method for system unequal error protection, which can be widely used in digital communication, audio and video communication, multicast or unicast communication systems. Background technique [0002] Raptor code is the most mature and advanced fountain code technology. Luby and Shokrollahi and others proposed and formed the international standard RFC5053 (later called "standard system Raptor code" or "standard Raptor code"), which was adopted by more than a dozen digital communication standards ( Such as 3GPP MBMS and DVB-H) adopted as the upper AL-FEC scheme, can significantly improve the anti-error performance and robustness of the entire communication system. The systematic code can restore the source data to the greatest extent when the decoding fails, so the systematic code is an important form of FEC coding. The degree distribution of the standard system Raptor code is carefully designed to ensure a very...

Claims

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Application Information

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IPC IPC(8): H03M13/37H04L1/00
Inventor 石东新王非非张远杨占昕赵艳明史萍
Owner COMMUNICATION UNIVERSITY OF CHINA
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