LDPC encoder based on DVB-S2 standard multi-rate compatibility

Abstract

The invention provides an LDPC encoder based on DVB-S2 standard multi-rate compatibility, which comprises a control signal generation unit and a check bit updating unit. The control signal generation unit generates, according to set encoding rates and an encoding initial identifier signal, a state control signal for controlling operation of the entire encoder, a plurality of addresses of corresponding rows in an address table, which are provided by easy input information bit to be encoded correspondingly to a DVB-S2 standard, and control identifier signals corresponding to the encoding rates, and outputs the state control signal, the addresses and the control identifier signals to the check bit updating unit; the check bit updating unit carries out binary addition operation on the information bits to be encoded and check bits read from the plurality of addresses corresponding to the information bits to be encoded, and writes an operation result into an original address. According to the LDPC encoder provided by the invention, by separately designing a control unit and an operation unit, the LDPC encoder compatible to various code rates is implemented; and encoding operation of the corresponding code rates can be completed only by setting the corresponding encoding rates at an external interface.

Description

technical field [0001] The invention relates to the technical field of channel coding and decoding, in particular to an LDPC coder based on DVB-S2 standard multi-code rate compatibility. Background technique [0002] The DVB-S2 standard is a new generation of digital satellite broadcasting standard launched by ETSI (European Telecommunications Standards Institute). The concatenated code of BCH code and LDPC code is used as the channel coding scheme in this standard. In order to adapt to different application scenarios and improve the transmission performance of satellites, the DVB-S2 standard adopts a variable coding and modulation scheme, that is, a combination of LDPC channel coding schemes with multiple code rates and multiple high-order modulation schemes. , using LDPC channel coding with an appropriate code rate and an appropriate high-order modulation scheme to obtain maximum transmission performance. [0003] In the DVB-S2 standard, a total of 11 different code rate...

AI Technical Summary

Problems solved by technology

[0012] Based on the above-mentioned algorithm requirements for the input coded information bits to be calculated simultaneously with multiple parity bits, and the influence of factors such as the different sizes of the seed matrix, the difficulty of realizing the multi-code rate LDPC coding circuit is increased; in order to reduce the difficulty of calculation, in the existing In the encoding technology, encoders with various code rates can be used to realize their encoding functions separately, or LDPC codes with different code rates can be used to store the seed address in the same memory, but due to the different calculation structures of the encoding, this increases the circuit Implemented hardware overhead

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