Algorithm Research Of MIMO-OFDM Channel Estimation

Because OFDM technique supports high-speed data's delivering, resists many path letter way interference and frequency chart utilization are high, so it is generally considered to be the core technology in 4G mobile communication systems. MIMO technology can greatly increase the capacity of wireless communications systems, and improve the performance of wireless communications systems,it is ideal for 4G mobile communications systems in the high-speed business requirements. Therefore unite MIMO technique and OFDM's these two techniques the consideration becomes a kind of very natural viewpoint.Channel estimation is one of the key technologies in MIMO-OFDM system, channel estimate of accurate or not the quality for relating to system function directly, so looking for quickly, accurate and dependable channel estimate algorithm is an important research topic by raising channel estimate accuracy.This text mainly launches the discussion now.Based on the analysis of the main features of wireless channel and the channel model this text discusses MIMO, OFDM system's main principles and key technologies, in-depth study based on the training sequence channel estimation, the text Introduce LS channel estimation algorithm and MMSE channel estimation algorithm.Delay for wireless channel is a discrete spectrum of this, multipath channel overlooked component zero or minimal path thereby reducing time-domain algorithm LS matrix inverse operation of the complex,at the same time gives its optimization training sequence; Thus improving system performance through the design of appropriate training sequence estimation method MMSE antenna into a single channel estimation,in order to further simplify the algorithm in this LMMSE introduced on the basis of estimation algorithm is proposed to use a single value decomposition method to reduce the complexity of the algorithm. Finally combining computer to imitate to really carry on to usefulness and possibility of these calculate ways finally to analyze and compare completely...