Online fountain code encoding and decoding method with unequal error protection strategy

Abstract

The invention relates to an encoding and decoding method of an online fountain code with an unequal error protection strategy. The encoding and decoding method comprises the following steps: step A, an encoder selects a window W1 or W2 and an encoding symbol with an encoding degree of 2 according to an extended window strategy and sends the encoding symbol to a receiving end; step B, the receiving end receives the coding symbol with the coding degree of 2 and the corresponding source code symbol sequence number and forms different connection groups; step C, the step A and the step B are repeated, when the number of the elements in the connection group with the largest number of the elements in the MISs reaches a preset value k1 alpha 0, the receiving end feeds back to the coding end, andthe coding end stops coding and sending of the coding symbol with the coding degree of 2 after receiving the feedback; step D, the encoding end encodes an encoding symbol with the encoding degree of 1from the MISs and sends the encoding symbol to the receiving end; and step E, the receiving end receives the coded symbol with the coding degree of 1 and the corresponding source code symbol sequencenumber and decodes the connection group and the like. Compared with the prior art, the method has the advantages of reducing decoding overhead and the like on the premise of ensuring unequal error protection performance.

Description

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

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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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