Adaptive Encoding/Decoding for Turbo codes

Original turbo codes are series or parallel concatenation of component codes. In this paper, we present a new structure of turbo code suitable for parallel Turbo code and serial Turbo code, for very low BER once Eb/N0 reached a certain point in the error floor region. The proposed code is modified Turbo code which uses parallel and serial concatenation of component codes. Compared with turbo codes, proposed code can achieve nearly the same decoding complexity with significantly reduced performance of BER in the error floor region. Simulation results demonstrate that the proposed Turbo code achieves good performance. The proposed Turbo code is easily adaptable to a large range of data block sizes. It can be used in any communication system where a significant power saving is required or the operating signal--to--noise ratio is very low.