LTE-Advanced Downlink Mimo Enhancement And Simulation

With the development of LTE-Advanced standardization process, more and more new technology is introduced. With the increasing demand for network capacity and diverse scenarios, LTE-A enhancement policy is studied extensively. Enhanced MIMO plays a key role in the LTE-A technology evolution. Multi-antenna enhancement MIMO technology as an enhancement MIMO hot topics provides technical support to enhance the effectiveness.Feedback enhancement as a hot sport for downlink MIMO enhancement in the whole standardizationprocess is widespreas concern. This thesis aimes to discuss CQI feedback enhancement, combined with the corresponding simulation evalution scene, gives reasonable standardized recommendations. The main work of this thesis include the following:Based on the LTE-A study background, this thesis introduces the LTE-A MIMO enhancement standardization and the LTE-A system of CQI reporting, analyzes deficiencies of the existing MU-CQI feedback mode exists. For CQI feedback occurs during multi-user pairing and other key technologies, this thesis analyzes the CQI feedback to further enhancement, and propoes a CQI feedback strategy; based on feedback enhanced homogeneous scene A and heterogeneous scene C, conductes a simulation. With the MU-CQI reported by UE, the system performance has6%to10%improved, on the required evaluation points of UE spectral efficiency CDF curve5%,50%.Aiming to solve the indoor converage, like femtocell scene, conbined with the reality of the specific characteristics of the deployment of distributed rendering, establish the vertical distributiong model and does the simulation assessment for different CQI feedback includeing the proposed strategy. For CQI feedback enhancement provides a proposal to the femtocell scene.Finally, this thesis summarizes the full text, and points out the direction of future research.