Pre-study LTE MIMO Coding System

With the rapid development of wireless communication technologies, the number of devices who enjoy various applications of wireless communication is growing exponentially, and the demand for high data rate becomes far more urgent than before. Multiple-input multiple-output (MIMO) technology has becomes a hot topic in the field of wireless communication. MIMO technology can significantly improve the data rate and link reliability, which has great theoretical significance and practical value. MIMO technology can be categorized into closed-loop and open-loop MIMO. In open-loop MIMO downlink, the transmitter can not obtain the channel state information (CSI). However, the transmitter can also enhance the signal strength or obtain the spatial multiplexing gain by using open-loop MIMO technology. In closed-loop MIMO downlink, the receiver can enjoy benefit from the precoding which is done according to the feedback.In this paper, I focus on precoding technology in LTE system to expand the research:the implementation of open-loop MIMO precoding and its application; the implementation of closed-loop MIMO precoding and it application; the implementation of alternating multiple differential codebooks and its performance. The advantages and disadvantages of these precoding technologies are analysed by simulation.