SELECTION OF CODE AND INTERLEAVER FOR TURBO CODING Figure 2 Encoder and decoder for turbo codes

ABSTRACT encoder. This is in fact the reason why we use the The selection of component codes for turbo coding has often been based on the performance at high SNR’s. However, we will argue that the selection mainly should be based on the performance at low SNR’s, i.e. the convergence properties. Further, we will present a way to construct interleavers that significantly improve the performance of the turbo coding scheme at high SNR’s, i.e. lowers the error floor 1