Study On Pilot-Based Channel Estimation For MIMO-OFDM Systems

Data transmission in wireless channels with high speed and reliability is required in future wireless systems. 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. Therefore, the application of MIMO-OFDM in wireless communication systems is robust and remarkable.In this paper, based on the introduction of fading channel, the basic principle and key technologies of MIMO-OFDM system are analyzed. Furthermore the channel estimation techniques and methods in MIMO-OFDM are discussed in detail, with the emphasis on pilot-based estimation methods, and also several basic algorithms are given. A reduced calculation channel estimation method is proposed, based on optimally designing the pilot symbols, then the complexity and computational work of traditional method is greatly reduced. Finally, the analysis and comparison of these algorithms is made by computer simulation.