Differential super-orthogonal space-time trellis coded modulation

In this paper, first, we extend the design of super-orthogonal space-time trellis codes to improve their performance. Then, we present a differential space-time trellis coded modulation scheme based on these extended super-orthogonal codes when the channel state information is not available at the transmitter and the receiver. We compare our differential modulation scheme with the trellis coded differential unitary space-time modulation scheme and note that not only does the proposed differential trellis coded modulation scheme achieve full diversity, but also it provides identical or higher coding gain and much lower decoding complexity for a given transmission rate. Simulation results demonstrate the good performance of our proposed scheme.