Hybrid automatic repeat request method based on improved effective signal-to-noise ratio

Abstract

The invention discloses a hybrid automatic repeat request method based on an improved effective signal-to-noise ratio. The method comprises the following steps: establishing a hybrid prediction model based on an HMM and an LSTM network; training a hybrid prediction model through the change data of the historical signal-to-noise ratio SNR, and obtaining the change trend of the effective signal-to-noise ratio ESNR of the channel at the next moment by using the trained hybrid prediction model; adjusting a check bit of a Hamming code according to the change trend of the effective signal-to-noise ratio ESNR and completing a data transmission process; in the transmission process, enabling the receiving end to carry out decoding and judging whether the decoding is successful or not: if the decoding is successful, continuing the transmission, if the decoding is failed, carrying out the retransmission, continuing to judge whether the decoding is successful or not, if the decoding is not successful and the number of retransmission times does not reach an upper limit value, continuing the retransmission of the data. According to the method, the bit error rate can be obviously reduced, the retransmission times are reduced, and the throughput rate of the system is improved.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a hybrid automatic retransmission request method based on an improved effective signal-to-noise ratio. Background technique [0002] With the rapid development of satellite communication in the world today, in the field of space information transmission, the demand for effective and reliable data transmission is increasing. How to minimize the bit error rate under the condition of ensuring the efficiency of data transmission has become an increasingly issues of increasing concern. However, satellite communication has the characteristics of long delay, high bit error and discontinuity. In order to improve the shortcomings of satellite communications, in 1982, several major space agencies in the world jointly established the Consultative Committee for Space Data Systems (CCSDS), and developed advanced on-orbit systems based on conventional on-orbit systems. System (Advanced...

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Problems solved by technology

[0004] Aiming at the problem that the traditional hybrid automatic repeat request method in the AOS system is difficult to take into account the bit error rate and transmission efficiency of data transmission at the same time during the transmission process, the present invention proposes a hybrid automatic repeat request method based on improved effective signal-to-noise ratio

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