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Non rate coding forward error control method suitable for dynamic long time delay channel transmission

A forward error control, rateless coding technology, applied in the direction of error prevention, transmission system, digital transmission system, etc., can solve the problem of channel transmission not suitable for wide dynamic range, affecting transmission efficiency, etc.

Active Publication Date: 2013-05-01
ZHEJIANG UNIV
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Problems solved by technology

The HARQ protocol requires the receiving end to return different types of feedback information for each encoded packet according to the decoding situation, which greatly affects the transmission efficiency under long-delay channel transmission; at the same time, FEC encoding with a fixed code rate is not suitable for wide dynamic range. channel transmission

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  • Non rate coding forward error control method suitable for dynamic long time delay channel transmission
  • Non rate coding forward error control method suitable for dynamic long time delay channel transmission
  • Non rate coding forward error control method suitable for dynamic long time delay channel transmission

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Embodiment Construction

[0034] Further illustrate the present invention below in conjunction with accompanying drawing.

[0035] The rateless coded forward error control method suitable for dynamic long-delay channel transmission of the present invention is that when the sending end sends a message packet each time, the length of the coded packet is pre-designed according to the known channel state distribution, and the message packet is coded according to the length Carry out the rateless encoding transmission of "segment finite length", and send each message packet continuously without rate encoding without interval. The rateless encoding method can use Raptor Code (see "Raptor Codes", IEEE Transactions on Information Theory, Vol.52, No.6, pp.2551-2567, June 2006). At the same time, the sender uses the estimated round-trip propagation delay at the current moment to estimate a timeout period for each encoded packet and starts a timer. If the ACK feedback information returned by the receiver is not r...

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Abstract

The invention discloses a non rate coding forward error control method suitable for dynamic long time delay channel transmission. A sending terminal adopts known time-following change distribution of channel state to estimate the coding length transmitted each time, adopts a mode of segmented finite length to accomplish nonseptate continuous non-rate coding transmission of each message packet, and is simultaneously used for controlling the sending of a forward incremental redundancy coding packet according to the two-way propagation time delay of each coding length packet. A receiving terminal accumulatively receives all coding packets of each message packet, performs non-rate decoding on all coding packets of each message packet, and feeds back ACK feedback information of the message packet to the sending terminal if decoding is successful. The method can be properly suitable for wide dynamic channel change, and simultaneously effectively avoids loss of channel resources and time slot resources brought by long time delay cannel of the traditional non rate coding transmission method.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a rateless coding forward error control method suitable for dynamic long-delay channel transmission. Background technique [0002] In dynamic long-delay channels, such as deep space channels, the transmission of coded packets and feedback information needs to experience a large delay due to the very long distance between the receiver and the receiver; at the same time, due to the complexity of the communication environment, the channel is dynamically changing , the sender can only obtain the dynamic change distribution of the channel state over time through learning, and it is difficult to obtain the instantaneous channel state at each moment. For example, a deep-space channel can be modeled as an additive white Gaussian noise (AWGN) channel with variable parameters, and its noise variance varies within a range according to a certain statistical distribution. For such a dyn...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/16
Inventor 姚创沐张朝阳屠坤张亮王献斌
Owner ZHEJIANG UNIV
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