A new iterative scheduling for BICM-ID embedded turbo codes

The iterative receiver for BICM embedded turbo codes is considered. In a simple iteration scheme, the two RSC decoders are treated as a single component. The demapper only takes the priori information from the second RSC decoder to generate new soft outputs for the first RSC decoder. However, this scheme gets worse BER performance with simple computation complexity. In the conventional iteration scheme, a component takes the priori information provided by the other two components to generate new soft information. However, this scheme has high iterative computation complexity with general BER performance. This paper proposes a new iteration scheduling among the components in the receiver, in which inner iteration between two RSC decoders and outer iteration between detector and decoders are used simultaneously. Simulation results show that the proposed scheme can achieve a good performance and complexity trade-off compared with the simple iteration scheme and the conventional scheme.