Research Of Channel Estimation Algorithm For MIMO-OFDM System

There are two serious challenges in the future broadband wireless communication systems: multi-path fading in the wireless channel and spectral efficiency. Wireless channel is a great limitation for reliable video transmission. The transmission loss, time-varying characteristics, noise, interference and the frequency-selective fading caused will bring too high an error rate to provide a reliable service quality during high-speed data transmission. Thus, it becomes a pressing problem to solve robust transmission for video business over wireless channels.As a combination of OFDM with space-time coding technique, MIMO-OFDM has received considerable attentions recently, which can not only effectively enhance the transmission rate and capacity of the wireless communication system but also combat multi-path fading and interfere.In this paper, we discuss the principle of MIMO-OFDM system based on the introduction of fading channels. We mainly analysis the STBC-OFDM system, focusing on the key technique of channel estimation in this system. An research of two kinds of channel estimation method based on comb-type-pilot and block-type-pilot has been taken in-depth. Several basic and improved algorithms are given respectively. We focused on the time-domain estimation algorithm using m-sequence method, and then presents a multi-phase sequence as an improved algorithm with simulations using matlab. At the last of the paper, we hold some to be researching. Finally, we put forward the contents in the MIMO-OFDM systems to be in-depth studied...