A Hybrid Automatic Repeat Request Transmission Method Based on Polar Code

Abstract

The invention discloses a hybrid automatic repeat request transmission method based on a polarization code. The hybrid automatic repeat request transmission method based on the polarization code comprises the following steps: after a coding bit sequence obtained after polarization coding is carried out to a sent information bit sequence is punched via a sending end, sending into a channel to be transmitted; decoding a received signal by a receiving end for CRC (cyclic redundancy check); if the received signal passes the check, feeding back an ACK (acknowledgement character) signal to the sending end, and otherwise, sending a NACK (negative acknowledgement) signal; if the sending end receives the NACK signal, sending one part of uncoded information bits to a receiving end again; according to the coding bit received for the first time and a newly-received information bit, decoding again by the receiving end; if a decoding result still does not pass the CRC, sending the other part of uncoded information bits to the receiving end again by the sending end; according to the coding bit received for the first time, the information bit received in the previous time and the newly-received information bit, decoding again by the receiving end; continuously executing the process; and finishing one whole transmission process until the sending end receives the ACK signal or the number of sending times reaches a preset maximum value.

Description

technical field [0001] The invention relates to a hybrid automatic repeat request transmission method based on polar codes, which is used to solve the problem of errors in transmitted data due to the interference of transmission channels on the communication process in digital communication systems; In digital communication systems where polar codes are used as error-correcting codes, a method for signal transmission through hybrid automatic repeat requests. The invention belongs to the technical field of channel coding of digital communication. Background technique [0002] Polar Codes (PolarCodes) was developed in 2009 by A constructive channel coding method that is rigorously proven to achieve channel capacity is proposed. Before polar coding, N=2 n independent binary input channels (or N consecutive uses of the same channel, that is, N available time slots of a channel), the application figure 1 The shown basic unit of channel polarization repeatedly polarizes binar...

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Problems solved by technology

[0022] The disadvantage of the above-mentioned prior art is that because the code length of a practical coding system cannot be infinitely long, after performing polarization operations on a limited number of channels, there will still be some channels whose transmission performance is not particularly good or not particularly bad

Therefore, under the existing decoding methods, the anti-noise performance of polar codes with limited code length is not ideal

Therefore, directly applying the polar code to the actual system cannot obtain a very ideal throughput rate

On the other hand, most of the HARQ systems that have been applied in actual systems are based on turbo codes or LDPC codes. Due to the limitation of the code construction method, the adjustment range of the code length is limited, resulting in a large system throughput and channel capacity. the distance

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