BCJR algorithm

BCJR Algorithm is a way of solving problems quickly. It stands for the "Bahl–Cocke–Jelinek–Raviv" algorithm and was invented by computer scientists. It's used to quickly and accurately solve problems related to things like coding and decoding in communications systems. It works by breaking a problem down into smaller parts and then solving them one at a time. This makes it much faster than solving the whole problem all at once. It's like building a puzzle from the outside in. First you put together the bigger pieces and then fill in the details.