Research On Key Technologies For CSI Acquisition For 5G

In real life,wireless communication has become an indispensable part.However,the explosive growth of mobile data services,massive terminal connections and energy-saving communications have made the traditional fourth-generation communication system unsatisfactory.For this reason,5G has higher requirements than 4G.He demanded significant improvements in energy efficiency,spectrum utilization,transmission rate,system security,and user experience.As one of the key technology of 5G,massive MIMO increases the data transmission rate by increasing the number of antennas and changing the antenna array to maximize the use of space resources.The performance of massive MIMO mainly determined by the accuracy of the channel state information.This paper first studies the key technology of channel state information acquisition,and then studies the demodulation reference signal of demodulated transmission data.Finally,it studies the CSI reference signal for acquiring channel state information to improve the flexibility and accuracy of CSI acquisition.The main research work include:1.Study the relevant technical solutions for CSI acquisition in 5G,and start from three aspects:CSI framework design,CSI measurement and CSI reporting,and introduce related technical issues.2.The principle and insertion method of DMRS and CSI-RS pilots are mainly studied,and a downlink-level simulation platform based on 5G multi-antenna is built for subsequent simulation verification.3.A CSI acquisition scheme based on DMRS adaptive density adjustment is proposed to solve the problem of balance between data transmission quality and effective data transmission rate.4.A CSI-RS-based CSI measurement and feedback enhancement scheme is proposed,and a deep learning-based channel prediction algorithm and adaptive codebook selection algorithm are introduced to achieve higher precision prediction of the channel.In this thesis,the link-level simulations of the above two schemes are carried out to verify the effectiveness and feasibility of the scheme.