Encoding and decoding method of online fountain codes with unequal error protection strategy

Abstract

The present invention relates to a method for encoding and decoding an online fountain code with unequal error protection strategy, comprising: step A: an encoder selects a window W according to an extended window strategy 1 or W 2 , the coded symbol with coding degree 2 is sent to the receiving end; Step B: the receiving end receives the coded symbol with coding degree 2 and the corresponding source code symbol sequence number and is used to form different connection groups; Step C: Repeat step A and step B, When the number of elements in the connection group with the largest number of elements in MISs reaches the preset value k 1 alpha 0 When the receiving end feeds back to the encoding end, the encoding end stops encoding and sending the coded symbols with the coding degree of 2 after receiving the feedback; Step D: the coding end obtains the coded symbols with the coding degree of 1 from the MISs and sends it to the receiving end; Step E : The receiving end receives the coded symbol with a coding degree of 1 and the corresponding source symbol serial number and uses it to decode the connection group, etc. Compared with the prior art, the present invention has the advantages of reducing decoding overhead on the premise of ensuring unequal error protection performance.

Description

technical field [0001] The present invention relates to the field of channel coding of wireless communication technology, in particular to an on-line fountain code coding and decoding method with unequal error protection strategy. Background technique [0002] Fountain code is a rateless code, which can continuously generate coded symbols from k source symbols. When the receiving end receives slightly more than k coded symbols, the source symbols can be solved, so it can well cope with changes in packet loss rate. network transmission environment. The online fountain code adjusts the coding strategy in time through the feedback of the receiver to keep it optimal in real time and further improves the reliability of transmission. Traditional online fountain codes provide equal error protection and equal recovery time for all source symbols. [0003] However, in the case of video coding and communication, some more important symbols in the decoding process require a higher sy...

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Problems solved by technology

[0005] However, the problem in the current research work is that the unequal error protection performance is achieved by selecting MISs to participate in encoding with a higher probability. Compared with LISs, MISs can be decoded faster and have lower decoding overhead. Thus leading to high priority of MISs at the cost of reduced performance of LISs

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