Design for the asymmetric turbo codes

Two types of asymmetric turbo codes are proposed, i.e., the parallel concatenated turbo codes that use the non-identical component encoder with different constraint lengths and mixed types of generator polynomials. The proposed schemes can optimize the BER performance of both water-fall region at low SNR and error-floor region at high SNR. The simulation results show the presented asymmetric turbo codes can achieve better performance than the conventional symmetric system over the entire ranges of SNR with a reduced decoding computational complexity.