Polar code hybrid automatic repeat request method based on channel reliability and code distance

Abstract

The invention discloses a polar code hybrid automatic repeat request method based on channel reliability and code distance. According to the method, an IR-HARQ strategy is constructed by using the extensible attribute of a polarization code generation matrix; a brand-new method for constructing a protection pair is provided, the reliability of a bit polarization channel is used, a high-reliabilitybit is used for protecting a low-reliability bit, the overall code distance attribute of an obtained code word is also considered, and the protection pair is finally established only when the code distance increasing requirement is met; an adjustable protection pair number concept is further introduced; the retransmission efficiency is improved by using the optimal or suboptimal protection pair number; after the retransmission input bit is coded, a retransmission bit string is obtained; and performing QPSK modulation and transmitting, cascading the retransmission bit string and the first packet polarization code word by the receiver, decoding the code word according to a standard SCL decoding algorithm, and finally estimating and detecting all original information bits until the decodingis successful or the maximum retransmission frequency is reached to finish the retransmission process.

Description

technical field [0001] The invention belongs to the technical field of wireless communication. Specifically, it relates to a polar code hybrid automatic retransmission request method based on channel reliability and code distance. Background technique [0002] Channel coding technology is a key technology to realize the requirements and goals of the fifth generation mobile communication system (5G). At the 3GPP RAN 87 meeting in November 2016, the final evaluation of candidate code classes for 5G enhanced mobile broadband (eMBB) data channels and control channels was performed. It is determined that the data channel in the 5G eMBB scenario uses binary low-density parity-check code (LDPC, low-density parity-check code), and the control channel uses polar code (polarcode). The polar code proposed by scholar Arikan is widely regarded as another milestone in the field of channel coding after LDPC code, and it is also the first channel coding method that is theoretically proven...

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Problems solved by technology

However, only the channel reliability is considered in the construction process of the retransmission input bits, and the overall code distance property of the codeword is ignored, which limits the performance of the polar code IR-HARQ strategy

[0007] In addition, according to the results of literature search, no existing IR-HARQ strategies based on polar codes have been specifically researched on small packet transmission scenarios.

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