.mimo / Ofdm System Channel Estimation Techniques

The need for wireless data and multimedia services promotes the development and applications of many high-speed wireless communication techniques. Orthogonal Frequency Division Multiplexing (OFDM) techniques and Multiple Input and Multiple Output (MIMO) techniques have gained more and more interest in the last a few years. As a combination of OFDM with space-time coding technique, MIMO-OFDM has recently received considerable attentions, which can not only effectively enhance the transmission rate and capacity of the wireless communication system but also effectively combat multi-path fading and interfere.In this paper, we discuss the principle of MIMO-OFDM system based on the introduction of fading channels. Furthermore, the channel estimation technique in MIMO-OFDM system is investigated, with the emphasis on training sequence-based and pilot-based channel estimation methods, and also several basic and improved algorithms are given respectively. Finally, the analysis and comparison of these algorithms is made by computer simulation.