FEC coding IP core for LEO satellite VCM data transmission system

The invention discloses an FEC coding IP core for an LEO satellite VCM data transmission system. The FEC coding IP core comprises an input cache module, a BCH coding module, an LDPC coding module, a parallel bit interleaving module and an output cache module, wherein the input cache module is used for receiving and caching to-be-coded information bits and VCM mode parameters set by a user; the VCMmode comprises a code rate R, a coding frame length L and a modulation mode; the BCH coding module is used for performing BCH coding on the kbch information bits according to a DVB-S2 standard, generating a code word with the length of nbch, and transmitting coded information to the LDPC coding module; the LDPC coding module is used for performing LDPC coding on the kldpc information bits according to a DVB-S2 standard to generate a code word with the length of nldpc; kldpc is equal to nbch, nldpc is equal to L, and the information bits and check bits are output to the parallel bit interleaving module in parallel in sequence; and the parallel bit interleaving module is used for realizing row and column interleaving required by a modulation mode in the DVB-S2 standard, and the coded and interleaved code words are transmitted to the output cache module in a symbol form for caching.