MAP04T

This is a very high speed 16 state maximum a posteriori (MAP) soft-in-soft-out (SISO) triple interleaved error control decoder with log-likelihood-ratio outputs for both the data and parity bits.

Features

• 16 state soft-in-soft-out (SISO) maximum a posteriori (MAP) triple interleaved error control decoder and systematic recursive convolutional encoder
• Up to 95 Mbit/s decoding speed
• Rate 1/2, 1/3, or 1/4 with optional punctured inputs
• 6-bit received data, 8-bit soft-in and soft-out data for information and parity bits for all rates
• 8-bit branch metric inputs for rate 1/2
• Optional code polynomials
• Optional block decoding with or without tail
• Optional max-log-MAP or log-MAP algorithm with 9 or 17 programmable SNR's
• Continuous sliding block algorithm with sliding block lengths of 32 or 64
• Low decoding delay (400 or 784 CLK cycles)
• No external RAM required
• Asynchronous logic free design
• Ideal for high speed iterative decoding of CCSDS turbo codes
• Available as BIT/MCS files for download into Xilinx Virtex field programmable gate arrays (FPGA) or EDIF/VHDL core.
• Data Sheet

Last update 19 Dec 2000. Home