The Research Of Space-Time Turbo Trellis Codes

With the fast development of mobile communication and emerging services, the demands for the limited frequency resource are booming. To develop highly efficient coding, modulation and signal processing technologies is becoming the most necessary measure to realize these demands. Space-time coding, which is based on multi-antenna transmit diversity, is a new coding/signal processing technique applied to wireless communication systems. It can increase system capacity and data rates through different mechanisms, without spreading the system bandwidth or increasing the transmit power. Space-time coding technology is the combination of channel coding and antenna diversity techniques and it enormously increases the wireless communication system capacity as well as diversity advantage and coding gain. Furthermore, its spectrum efficiency significantly exceeds that of conventional single-antenna systems. Since the advance of space-time coding, there has been an extensive research and it is very likely to be used in next-generation mobile communication systems.The major point of this thesis is to research the space-time trellis code (STTC)techniques and the space-time turbo trellis code techniques. Firstly, the compiling principle and design criteria of STTC, as well as decoding performance, have been analysed and emulated detailedly. The coding and decoding technique of Turbo codes is studied in follow. Finally on the basis of circumstantiating the theory of space-time turbo trellis code, a new class of space-time coding method that aims at improving the decoding performance will be presented. The experiment result indicates that the improved scheme has a smaller storage and time-delay of decoding compared with Log-MAP algorithm, which is more applicable to practical systems.