Hybrid concatenated super-orthogonal space-time trellis codes applying iterative decoding

Hybrid concatenated code is a combination of parallel and serial concatenated codes. In this paper, two hybrid concatenated super-orthogonal space-time trellis code (SOSTTC) applying iterative decoding is proposed for flat fading channels. The encoding operation is based on the concatenation of convolutional codes, interleaving and super-orthogonal space-time trellis codes. The first concatenated scheme consists of a serial concatenation of a parallel concatenated convolutional code with a SOSTTC while the second consist of parallel concatenation of two serially concatenated convolutional and SOSTTC codes. The decoding of these two schemes is described and their bit error rate (BER) and frame error rate (FER) performance evaluated by computer simulation in Rayleigh fading channels. The proposed topologies are shown to perform better than existing concatenated schemes with constituent code of convoluntional and space time codes in literatures.