CCSDS 231.0 LDPC Encoder and Decoder

The CCSDS 231.0 LDPC IP core supports the LDPC coding schemes as defined by the CCSDS standard. The LDPC codes with rate 1/2, coded block lengths 128 and 512 are specially designed for telecommand applications, but the excellent error correction performance makes it an ideal fit for further applications with highest demands on forward error correction.







  • Telecommand communication
  • Free space optical (FSO) communication
  • Further applications with the highest demands on forward error correction

Standard Features the Core Supports

  • Support for code rate 1/2
  • Uncoded block sizes of 64 and 256
  • Compliant with “TC synchronization
    and channel coding, Recommended
    Standard, CCSDS 231.0-B-3, Blue
    Book, September 2017”


   Your Benefits


  • Gains of up to 3 dB compared to Viterbi decoders
  • Low-power and low-complexity design
  • Layered LDPC decoder architecture, for convergence behavior that is twice as fast as non-layered LDPC decoders
  • Early stopping criterion for iterative LDPC decoder, saving a considerable amount of energy
  • Optional fixed number of iterations for fixed latency of blocks with the same code rate and block length

  • Configurable amount of LDPC decoding iterations for trading-off throughput and error correction performance
  • Collection of statistic information (number of iterations, decoding success, number of modified bits)
  • Available for ASIC and FPGAs (AMD Xilinx, Intel, Microchip)
  • Deliverable includes VHDL source code or synthesized netlist, VHDL testbench, and bit-accurate Matlab, C or C++ simulation model

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