an ldpc encoder

Abstract

The present invention provides an LDPC encoder, comprising: an encoding memory for storing a set LDPC encoding matrix and an LDPC code table; N random access memory RAMs; and a storage controller for controlling the reading and writing of the N RAMs in parallel; The operator is used to perform operations on the information bit part in the encoded codeword and the LDPC encoding matrix; the delay module represents a necessary delay for the input information bit part, so that the generated parity bit part can be continuous with the information bit part Output; the splicing module is used to splice the information bit part and the parity bit part to output, wherein the operation result obtained by the operator is stored in the coding memory, and the number of the coding memory is determined by the maximum column weight N of the coding matrix , the present invention can make the storage space of the LDPC coder as small as possible without making the design too difficult, and can also take into account the versatility of different codewords.

Description

technical field [0001] The invention belongs to the technical field of channel coding, in particular to an LDPC coder. Background technique [0002] LDPC (Low Density Parity Check Code, Low Density Parity Check Code) coding technology is a research hotspot in the field of channel coding in recent years, and has been widely used in satellite communication, optical fiber communication, mobile communication, digital broadcast communication and other fields. The advantage of LDPC code is that it is close to the Shannon limit, flexible structure, and lower error floor; but the disadvantage is that the hardware resource requirements are relatively large, especially the longer codewords can reflect the performance advantages, resulting in more complex encoding and requiring more hardware. The resources are larger; if the encoder is designed purely from the perspective of saving resources, the control of the encoder will be complicated or excessive processing delay will be brought. ...

AI Technical Summary

Problems solved by technology

Such a large storage capacity requirement is very unfavorable for the miniaturization and low power consumption of the LDPC encoder; in order to save storage space, only 1*25920 storage units can be used, but the corresponding addressing operations will become quite complicated. The processing delay will also be greatly increased, which will bring great difficulties to achieve fast and reliable LDPC encoding

In addition, because LDPC codewords also have certain "irregular" characteristics, that is, a considerable part of the codewords cannot be obtained through calculations, so that the implementation structure of the LDPC encoder is closely related to the construction structure of the codewords, thus changing the code table is likely to lead to The entire LDPC encoder design is pushed back to the

[0004] In summary, when constructing an LDPC encoder, if we can find a way to make the storage space of the LDPC encoder as small as possible, without making the design too difficult, and taking into account the versatility of different codewords—— Replacing the codeword will not make the whole design overturned and restarted, so this method can be regarded as a significantly improved LDPC encoder design method

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