Digital Front-end Downlink Of Lte Base Station Rf Unit Design And Research

With the rapid development of global information,as well as the rise of multi-media entertainment and the development of online game,the current 2G and 3G telecommunication system can't meet the requirements of the wideband communication in the future.Therefore,with the increasing demand of wireless broadband ,and mobile communication technology continues to advance,the 4th generation mobile communication system which has high-speed transfer data rate begin to come into people's vision.LTE is considered as the mainstream technology from 3G to 4G.Compared with the former system,it has the higher data peak-rate,lower lantency and higher spectral efficiency. LTE mobile stations are normally taken by the distributed (MU + RRU) of the structure.RRU as the radio unit, palys an important role in base station.The digital IF part is the core of RRU. which not only convert the data rate, but also through some techniques to linearize the PA and improve the efficiency of PA. the digital IF part is generally component of DUC,DDC,CFR,DPD.the thesis will research the DUC and CFR which is the key part of the down link.the efficient algorithm of DUC and CFR can improve the utilization of spectrum and Anti-jamming capability,and reduce the PAPR in the LTE system.effectively reducing the requirement for PA linearity.This thesis reviews the development of mobile communication and software radio,introduces the the application of software radio in RRU.Then the signal sample theory,multirate signal processing,and efficient filter design of an important foundation for software radio is introduced.followed by the principle of DUC and CFR and a detailed description.Then,based on the theory of software radio,DUC and CFR module which are suitable for TDD-LTE system are designed.Firstly we use matlab to design and simulate the filters.then use System Generator to setup the model.After simulation and verification,the code is self-generated by System Genrator.Then the code is download to FPGA to verify.The result shows that the design of DUC and CFR can meet the requirement of productions .The disadvantage is discussed finally.