Encoding method for cyclic redundancy check code of transmission block

Abstract

The invention relates to a coding method of a transmission block cycle redundancy check code CRC, which is applied for a coding device comprising a CRC coder and a subsequent coder, according to the maximum coding length of the other coder, if the CRC coder judges a transmission block is larger than the maximum coding length after CRC check bits are added, the CRC coder performs segmented encoding once or for a plurality of times and obtains a plurality of CRC code blocks the lengths of which are smaller than or equal to the maximum coding length, and each CRC code block comprises at least one CRC check bit. The coding method of the invention can satisfy the false check demand of a system and reduce the computational complexity of a Turbo decoder or an LDPC (low density parity check) decoder.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a method for encoding a cyclic redundancy check code of a transmission block. Background technique [0002] The Cyclic Redundancy Check Code (CRC) is a systematic shortened cyclic code widely used in frame checking. [0003] The structure of the transmission block with added CRC check bits is as follows figure 1 shown. Wherein, C(x) is a polynomial of degree n-1, X(x) is a polynomial of degree k-1, and r(x) is a polynomial of degree n-k-1. The k coefficients of X(x) correspond to k information bits in the CRC, and the n-k coefficients of r(x) correspond to n-k CRC check bits. It is customary to record n-k CRC check bits as CRC. In fact, CRC refers to the entire frame. [0004] In the prior art, a CRC coding scheme in a transmission block defined by the 3GPP system is as follows: figure 2 shown, including the following steps: [0005] The first step: carry out 24 CRC co...

AI Technical Summary

Problems solved by technology

[0008] The possible disadvantage of this method of adding CRC check bits is: when the transport block is much larger than the transport block in the existing system, if each transport block still only uses a 24-bit CRC check bit for error detection, it is possible Cannot meet the system's requirements for false detection rate

If still according to the above method, each transmission block uses a 24-bit CRC check bit for error detection, the false detection rate may not meet the requirements of the system, and it is not conducive to the realization of fast and high-throughput hybrid automatic retransmission (HARQ) and Reduce the complexity of terminal implementation

Images