Capacity Analysis And Research On Channel Estimation Technique In MIMO-OFDM System

MIMO-OFDM technique is deemed to have large potential in B3G/4G and future wireless communications system. A multiple-input and multiple- output MIMO-OFDM system is a system that employs multiple transmit and receive antennas in an Orthogonal Frequency Division Multiplexing (OFDM) communication system. The combination of MIMO and OFDM has greatly improved the communication capacity and transmission rate. In the meantime, MIMO-OFDM system can effectively combat multi-path fading and interference. Therefore, the application of MIMO-OFDM in wireless communication systems is robust and remarkable.Channel estimation technique plays a quite meaningful and challengeable role in MIMO-OFDM system. So this paper has studied the technique of channel estimation in MIMO-OFDM system by both theoretical analysis and computer simulation. 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 estimationmethods, and also several basic and improved algorithms are given respectively. Finally, the analysis and comparison of these algorithms is made by computer simulation.