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A Realization Method of Adaptive Analog Fountain Code Oriented to Ka Frequency Band Communication

An implementation method and self-adaptive technology, applied in the direction of digital transmission system, error prevention, electrical components, etc., can solve the problem of not being able to get feedback, and achieve the effect of good link transmission performance

Active Publication Date: 2019-08-09
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

On the other hand, the long propagation delay in the space communication environment makes it difficult for the sender to obtain channel state information (CSI) for correction in real time. Existing space communication transmission protocols such as CFDP (CCSDS file delivery protocol) and LTP (Licklider transport protocol) Both provide delayed feedback confirmation mode, the sender can only obtain delayed CSI through negative acknowledgment (NAK), and even cannot get feedback

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  • A Realization Method of Adaptive Analog Fountain Code Oriented to Ka Frequency Band Communication
  • A Realization Method of Adaptive Analog Fountain Code Oriented to Ka Frequency Band Communication
  • A Realization Method of Adaptive Analog Fountain Code Oriented to Ka Frequency Band Communication

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[0031] Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail:

[0032] Such as figure 1 As shown, this example provides an implementation method of an adaptive analog fountain code for Ka-band communication, including the following steps:

[0033] Step S1, establishing a noise model of the N-state Markov chain, and predicting the channel state of the noise model of the N-state Markov chain;

[0034] In step S2, the simulated fountain code is optimized based on the predicted channel state to obtain an adaptive simulated fountain code.

[0035] In step S1 described in this example, the receiver noise temperature corresponding to the weather state near the ground station is divided into N states, and the noise model of the N-state Markov chain is established, and the autoregressive moving average model (Autoaggressive Moving-Average, ARMA ) establishes the prediction algorithm of channel state, and described...

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Abstract

The present invention provides an implementation method of adaptive simulation fountain codes facing Ka frequency band communication. The method comprises the following steps: the step S1, establishing an N-state markov-chain noise model, and performing predication of the channel state of the N-state markov-chain noise model; and S2, optimizing the simulation fountain codes based on the predicated channel state, and obtaining the adaptive simulation fountain codes. According to the invention, the N-state markov-chain noise model is subjected to the channel state prediction through an autoregressive and moving average model to allow the simulation fountain codes to be linear in the coding and decoding complexity so as to improve the high-speed bit rate transmission which is not less than 1 in the large signal to noise ratio range. The implementation method of adaptive simulation fountain codes facing Ka frequency band communication combines the prediction model and the simulation fountain codes and provides the encoding implementation method capable of fitting for the adaptive simulation fountain codes of Ka frequency band rain attenuation, and the throughput rate is far higher than the constant bit rate coding scheme and the adaptive LT code scheme so as to obtain a good link transmission performance.

Description

technical field [0001] The invention relates to a method for realizing an analog fountain code, in particular to a method for realizing an adaptive analog fountain code oriented to Ka frequency band communication. Background technique [0002] In order to further improve the space information transmission capability, my country successfully launched the "Communication Technology Test Satellite No. 1" in September 2015 to test and verify the communication link in the Ka frequency band (28-35GHz). The Ka frequency band can greatly increase the communication bandwidth, but its signal is affected by atmospheric absorption, rain attenuation near the receiving end, and multipath effects, and the bit error rate (BER) of the link fluctuates greatly. Studies have shown that the receiving signal-to-noise ratio of Ka-band satellite communications fluctuates to 10-25dB. When the rainfall intensity is 10 mm / hour, the link communication of 31 to 35 GHz is interrupted; when the rainfall i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0057
Inventor 焦健陈晨冯博文姚朋飞吴绍华张钦宇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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