A Design Method of Degree Distribution Function for Network Layer Fountain Code and Channel Joint Coding
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A joint coding and degree distribution technology, which is applied in the design of the degree distribution function of the network layer fountain code and the channel joint coding, and can solve the problem of the inapplicability of the degree distribution function.
Active Publication Date: 2020-09-04
广州市端方物联科技有限公司
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[0007] An embodiment of the present invention provides a method for designing a degree distribution function of joint encoding of fountain codes and channel encoding at the network layer, which is used to solve the problem in the prior art that the traditional degree distribution function is not suitable for the joint decoding method of fountain codes and channel encoding
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Embodiment 1
[0099] Assume that the source has sent k=1000 data packets, and is disturbed by channel noise, etc., and n=400 correct data packets are received, and the rest are all erroneous data packets. choose l max = 3, that is, 1 coded packet is adjacent to 2 error packets or 3 error packets can be adjacent with probability p c(2) or p c(3) Recover the error data packet to achieve the purpose of error correction. Parameters in the degree distribution function c=0.03, δ=0.5. Matlab is used for simulation, and the number of simulations is 2000.
[0100] The influence of channel erasure probability changes on the number of encoded packets required for decoding:
[0101] Channel deletion probability p er The change range is 0~0.95, and the step size is 0.05, and the probability p of the two error data packets adjacent to the encoded packet is restored at the same time c(2) =0.6, the probability of recovering 3 error packets p c(3) =0.2, the simulation results are as follows figure ...
Embodiment 2
[0110] Joint coding and decoding method of fountain code at network layer and channel coding at physical layer:
[0111] Assuming that the source needs to transmit k groups of data packets with verification functions, the fountain code is used to encode them at the network layer, and the fountain code at the network layer is jointly decoded with the physical layer, and l max ≤3. Its implementation method is as follows:
[0112] 1) The source sends a set of information to estimate the channel, and the channel deletion probability P is measured er and the probability P of encoding packets to recover multiple erroneous packets c(2) P c(3) .
[0113] 2) Send k groups of original data packets with error detection function to the receiving end, and the receiving end will perform error detection on the received original data packets to determine whether the data packets are correct, and count the number n of correct data packets.
[0114] 3) If n=k, then send an ACK to the sourc...
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Abstract
The invention discloses a degree distribution function design method of network layer fountain code and channel joint encoding. The method comprises the following steps: importing a channel deletion probability and an error correction probability of MP joint decoding into an EISD degree distribution function, and determining the degree distribution function of a signal source to send an encoding packet by an expression of a channel deletion and error correction probability influence function and the expression of a Per-Pc-EISD degree distribution function; importing a strong robust factor, and determining an expanded Per-Pc-EISD degree distribution function based on the channel deletion probability and the error correction probability; performing transfer and normalization processing on the Per-Pc-EISD degree distribution function, and determining the degree distribution function of joint encoding of network layer fountain code encoding and physical layer channel encoding. According to the degree distribution function design method disclosed by the invention, when the Per-Pc-EISD degree distribution function is designed, the probability of restoring a plurality of wrong data packets during the encoding and the channel deletion probability are imported into the degree distribution function, with respect to the joint encoding method of adopting fountain code encoding on a network layer and adopting channel encoding on a physical layer, the decoding cost is effectively reduced, and the reliability and speed of wireless transmission are improved.
Description
technical field [0001] The invention relates to the technical field of wireless transmission information security, in particular to a method for designing a degree distribution function of network layer fountain code and channel joint coding. Background technique [0002] With the rapid development of modern communication technology, wireless communication technologies such as mobile communication, Internet and wireless sensor network have gradually entered people's daily life, but wireless channels will be affected by various interferences, resulting in errors in signal transmission, affecting Signal transmission quality. How to ensure the high-speed and reliable transmission of signals has become a hot spot in the research of wireless communication networks. [0003] Digital fountain code is to linearly encode data packets at the network layer according to the probability distribution. It has the characteristics of small decoding overhead and low computational complexity....
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