Research On MIMO Wireless Channel Modeling And Characteristic

MIMO technology is the most promising breakthroughs in improving system performance, capacity and spectrum efficiency. MIMO system adopts multi-antenna systems on both sides of sender and receiver, sending and receiving signals at the same time, fully making use of space resource, improving system performance without extra transmitting power and spectrum resource. The performance promised by MIMO is highly depended on the propagation channel models. So the corresponding MIMO radio channel models are established to study and evaluate the system performance.This paper describes the research background, significance and the study of MIMO channel status. Then, radio channel fading characteristics including large-scale fading, small-scale fading and statistical properties of channel envelope are fully described. Furthermore, the physical model and non-physical model of MIMO channel are particularly introduced. Sort existing MIMO channel model, and fully describe the method, parameter and process of SCM and Distributed MIMO System (DMS). The theory of MIMO channel capacity and spatial-time correlation are studied, and formulas are analyzed. And then, simulate SCM and DMS, and study the impact which antenna structure, polarization diversity and space diversity played on channel capacity. The relationship between spatial-time correlation and antenna spacing, AS, AOA is investigated. Finally, some ideas and suggestions are brought forward for the further work.