Research Of CoMP Technology In LTE-A

Long Term Evolution Advanced is a new standard,based on Long Term Evolution technology.LTE and LTE-A network structure posed a serious inter-cell interference,so in order to better solve the interference,improve spectrum efficiency,3GPP proposed CoMP(Coordinated Multi-Point)technology in the LTE-A.CoMP technology principle is aimed at edge cell,through several poor community collaboration community,in collaboration with resource allocation,information transmission,avoiding interference or jamming into useful signals.Through researching the principle of CoMP technology,design several specific plan based on CoMP,that is the Terminal joint transmission scheme,including collaborative terminals selection and matching,collaboration sets selection and division of resources,etc.This thesis selected LTE-A as a prototype,explored the CoMP specific implementation plan,roughly as follows:Firstly,introduced the technology and application of LTE-A system,and proposed CoMP technology and solutions facing the problems of interference between edge cells.Based on CoMP,proposed single(double)terminal joint transmission scheme,jamming into useful signals to improve spectral efficiency.Secondly,researched the selection of collaboration terminals and base stations in CoMP technology.In communication,looked poor-quality interactive terminals as collaboration.What to do is to set the received power of reference signals to distinguish collaboration terminals and central terminals.And for double terminals joint transmission scheme,normalized and sum the inner product of the channel,selected the minimum matrix to pair.Finally,in order to verify the CoMP plan,designed the system simulation platform,mainly to select the CoMP to determine network topology of the system,including deployment of Pico Cell in the cell edge regions and terminal release process.Due to the property of channel multiple path in the wireless communication systems.Focused onsending and receiving channels of the system,as well as path loss and signal fading issues.The innovations can be summarized as follows:Firstly,considering of the waste of resources based on cooperative base station to serve the single terminal,designed multiple terminal joint transport research shame,saving resources and more practical.Collaboration set make a service for multiple Terminal in a time-frequency resources on the block at the same time,each cooperative base station has more than one terminal data information,but each cooperative base station has different precoding matrix.Also,if the channel information between each terminal to all collaborative sets can be get by all collaborative sets,it will have a set of interference between multiple terminals,so the base station requires using precoding scheme to eliminate the interference.Secondly,for double terminals joint transmission scheme,normalized and sum the inner product of the channel,selected the minimum matrix to pair,greatly reduced computation compared to the SVD decomposition.In the simulation,given the computation of the SVD decomposition between the edge UEs of their virtual MIMO channel is too great,and it not too easy to achieve the maximum singular value and the ratio of minimum singular worth not too big,it cannot access to multi-user multiplexing gain.In order to simplify the calculation,instead of on each h-matrix SVD decomposition on the PRB,it will transmit information in the same TTI and same time and frequency block,calculate the inner product of each collaboration channel matrix rows vector,and normalize to sum.