Parallel decoding method for turbo decoding and turbo decoder using the same

摘要

Parallel decoding method for turbo decoding according to the present invention, by dividing the input data signal into sub-blocks of a predetermined number and parallel decoding method for turbo decoding the respective sub-blocks that are parallel and independently, the predetermined number of times according to the performance specifications and by performing the iterative decoding process, a decoding process is repeated ; The odd-numbered sub-block performs the forward state metric calculation first, and the even-numbered sub-blocks comprising a reverse state metric calculation process, first; The odd-numbered sub-blocks comprising a reverse state metric calculation process, even-numbered sub-block performs the forward state metric calculations; And each sub-block is characterized by having a step for calculating the extrinsic information value. ; According to the present invention First, no time delay by eliminating the overhead of the training period when the parallel decoding for turbo decoding. Second, by using a boundary condition metric value calculated for inaccuracies in the initial state metric value that is a problem when the block division in the adjacent block is obtained the effect to put a longer training period than a conventional algorithm. Therefore, the performance degradation does not occur in a shorter length than the sub-block. Decoding delay is proportional to the length of the sub-blocks. Therefore, it is possible to implement turbo decoder with a smaller decoding delay, according to the present invention.