Abstract
This thesis is focus on a MIMO-OFDM system, which uses space frequency block coding algorithm for high mobility environment. An inner transmitter and receiver for IEEE 802.16e uplink specification is designed to implement this algorithm. In order to model a high mobility environment, ITU-VA channel model, which is constituted by 3GPP, is used for the simulation. Additionally, Jakes model is added to simulate the high mobility environment. Compare with space time block code and space frequency block code, space frequency block code has better performance in outdoor environment with high mobility. Thus, this thesis propose a SFBC decoding algorithm to against Doppler effect. An 2x2 SFBC-OFDM is defined in IEEE 802.16e standard. The simulation result shows that Doppler effect can be alleviated through this algorithm. In general SFBC system, the adjacent channel responses are assumed constant. However, channel responses are not constant in real communication systems, especially in high mobility environment. The variation between adjacent channel responses causes interference while decoding, so the error will occur in high SNR. Thus, an interference cancellation method is needed to solve this problem. The demapping result is sent back to the SFBC decoder for the interference cancellation. The simulation result shows that this cancellation can prevent error floor in high SNR region. In order to implement this system, we designed an inner transmitter platform for high speed emulation. This platform consist hardware part and software part. Some complicated operations can be implement in hardware, so the emulation time can be reduced. Furthermore, the receiver is designed in software, so the user can change or replace the receiving method easily. If designer want to develop a new receiving algorithm, it can save the development time. Additionally, this platform is built on the webpage, so everyone can use this platform from anywhere through the internet.