The Decoder Of Space-time Block Codes Over Time-varying Channels And Its Application In OFDM System

With the development of mobile communication, the demands for the limited frequency resource are booming. The major challenge in today's wireless communication is how to serve the explosively increasing demand of multimedia service within the limited bandwidth. Among those emerging technologies, multiple-input multiple-output (MIMO) communication architecture has showed its infinite potential to improve spectral efficiency dramatically. By deploying multiple antenna elements at both transmitter and receiver, MIMO has been regarded as an inevitable promising approach to exploit maximum spatial resources among many emerging technologies. Space-time coding (STC), a new coding technique based on the MIMO system enormously increases the wireless communication system capacity and the data rate without additional system bandwidth and transmitting power.The dissertation focuses on the space-time block coding (STBC), a kind of STC with simple decoding scheme, which may be used in the next generation mobile communication systems. The main contents are arranged as follows. Firstly we surveyed background and elements of MIMO techniques. Comparison is given between other techniques and MIMO wireless communications to demonstrate necessity and inevitability of research on MIMO.The chapter 2 provides time-selective and frequency- selective fading channel's model which will be used in the later chapter. In the last of this chapter, we overviews the Alamouti' space- time block coding. In third chapter, we propose two new decoders for space-time block codes using multi received antennas over time-selective rayleigh fading channels that arise due to Doppler shifts and carrier frequency offsets. The better performance is shown by simulation results presented for various channel-fading rates. The chapter four provides the well-known Jakes channel model and the joint channel estimation...