(2006-09-28) (Data obrony: 2007) Kułakowski, Paweł Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
In this thesis, the performance of the MIMO (Multiple-Input Multiple-Output) systems in slow and fast varying radio channels is discussed. In the chapter 1, the general issues of MIMO systems are considered. The tradeoff between the spatial multiplexing and the diversity is explained. The importance of the channel knowledge is discussed. Also, the telecommunication standards concerning the MIMO systems are described. The chapter 2 is devoted to the channel aspects of MIMO systems. Then, the most important MIMO channel models are presented. The issues of the channel estimation and the time variations are included. In the last two chapters, the research results of the author of this thesis are presented. The broad analysis of the wireless MIMO indoor network in slow varying radio channel is performed in the chapter 3. The directivity of the access point antennas and their location are carefully studied. The MIMO system with adaptive antennas is also considered. Ali the calculations are made on the basis of the deterministic ray tracing model. In the chapter 4, the new algorithm for channel estimation in fast varying radio channels is introduced and verified. It is shown that bit error rate can be decreased without frequent transmissions of pilot symbols. The thesis closed with the general conclusions about the author's research and the MIMO systems in time-varying channels.
