Method and device for rate matching of Polar code

Abstract

The invention discloses a method and device for rate matching of Polar codes. The method comprises the steps of: performing Polar code encoding on an information bit sequence with a K-bit length, and generating an encoding bit sequence with an M-bit length; selecting Nmin bits from the encoding bit sequence as the first bit to Nmin-th bit of a bit sequence to be transmitted during a hybrid automatic repeat request (HARQ) process; and determining each bit of (Nmin+1)th bit to Nmax-th bit of the bit sequence to be transmitted from the information bit sequence and the encoding bit sequence, wherein each bit of the (Nmin+1)th bit to the Nmax-th bit of the bit sequence to be transmitted is determined according to a frame error rate of the bit sequence to be transmitted when each bit is added into the bit sequence to be transmitted. By adopting the method of the embodiment of the invention, HARQ transmission based on Polar code encoding can be achieved, and better encoding gain can be obtained.

Description

technical field [0001] Embodiments of the present invention relate to the field of coding, and more specifically, to a method and device for rate matching of polar codes. Background technique [0002] Communication systems usually use channel coding to improve the reliability of data transmission and ensure the quality of communication. Recently, the polar (Polar) code proposed by Arikan is the first good code that can obtain Shannon capacity and have low encoding and decoding complexity theoretically. When the code length is short, the performance of the traditional Serial Cancellation (Successive Cancellation, SC) decoding is not ideal, and its performance is not as good as the Low-Density Parity-Check (LDPC) which has been widely used at present. code or Turbo code. [0003] The latest research shows that based on the improvement of the SC algorithm, the serial cancellation list (Successive CancellationList, SCL) decoding, the serial cancellation stack (Successive Cance...

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Problems solved by technology

[0006] However, the code length of traditional Polar codes is strictly limited and must be an integer power of 2, which cannot be applied to systems that require code lengths that can be flexibly adapted to system requirements using HARQ transmission schemes.

In the prior art improved on this, the coding is simply repeated during retransmission, and a good coding gain cannot be obtained.

When the coding gain is improved, the decoding complexity is very large

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