Method and coding device for LDPC coding

Abstract

The invention discloses a method to achieve LDPC codes and a coder, which comprises a plurality of member coders, a control unit and a selector unit. The member coders are connected in parallel, and encode input information by making use of corresponding check matrix, and output corresponding encoded results to the selector unit. The control unit controls the encoded results of corresponding member coders selected by the selector unit according to the set code rate, and outputs the results. By adopting the invention, LDPC codes of various speeds are generated under the circumstance that the check matrix structure is not destroyed; structures of all of the member coders are independent, and are unrestricted by each other to achieve simplicity. In addition, when the HARQ technology is adopted to send the information, LDPC codes of various speeds can be generated through simple combination according to the preset variable rate proposal, accordingly, the invention works flexibly.

Description

technical field [0001] The present invention relates to the communication field, in particular to coding technology. Background technique [0002] The performance of the Low Density Parity Check code (LDPC code, Low Density Parity Check code) is close to the Shannon limit, and after the LDPC code is used at the sending end, the parallel decoder is used for decoding at the corresponding receiving end. Due to the characteristics of low decoding complexity and high decoding throughput when using a parallel decoder and the performance of the LDPC, the LDPC coding technology becomes one of the main candidate technologies for the next generation of mobile communication. [0003] In the communication system, in order to improve the throughput of the system, the hybrid automatic error detection and retransmission (HARQ, Hybrid Automatic Repeat request) technology of increasing redundancy is usually adopted. If the receiving end cannot decode correctly, then send some redundant info...

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Problems solved by technology

[0009] Since the output of the previous member encoder is constrained as the input of its next member encoder in the prior art 2, it is required that the code block lengths of two adjacent member encoders must match, that is, the output length of the current encoder N i Must be equal to the input length K of the member encoder of the next level i+1 , so that the structure of each member encoder is constrained to each other

[0010] In addition, due to the serial connection of multiple member encoders in the prior art 2, the HARQ technology can only be used to encode the information in sequence when retransmitting information, and then output the retransmitted information, so the flexibility is poor

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