The Turbo decoder consists of two single soft-in soft-out (SISO) decoders, which work
iteratively. The output of the first (upper decoder) feeds into the second to form a
Turbo decoding iteration. Interleaver and deinterleaver blocks re-order data in this
process.
Figure 8. Turbo Decoder Block Diagram
The Turbo decoder supports the MaxLogMAP decoding algorithm. This algorithm is a simplified version of LogMAP that uses less logic resource and offers slightly reduced BER performance relative to LogMAP.