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

Abstract

The invention discloses a polar code hybrid automatic retransmission request method based on channel reliability and code distance. The method utilizes the scalable property of the polar code generation matrix to construct an IR-HARQ strategy, and proposes a new method of constructing protection pairs. method, not only using bit-polarized channel reliability, using high-reliability bits to protect low-reliability bits, but also taking into account the overall code distance properties of the obtained codewords, and finally establishing protection when the code distance increase requirements are met. Yes; the concept of the number of adjustable protection pairs is further introduced, and the retransmission efficiency is improved by using the number of optimal or suboptimal protection pairs. The retransmission input bits are encoded to obtain a retransmission bit string, and then QPSK modulation is performed to transmit and receive The machine concatenates the retransmitted bit string and the polar code word of the first packet together, decodes the code word according to the standard SCL decoding algorithm, and finally estimates and detects all the original information bits until the decoding is successful or reaches the maximum weight. The retransmission process is completed.

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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