LTE System Coexistence Interference Studies

With the rapid development of the WiMAX technology,3GPP launched the LTE project to keep its advantage in wireless communicaiton field. LTE is a wireless technology between HSPA and IMT-Advanced.The wirless frequency that can be used is rare. Because of the non-perfect performance of the transmitter and receiver, there is adjacent channel interference between the systems working in adjacent channels. CCSA TC5 WG8 is now studying the 2500MHz to 2690MHz frequency allocation. Coexistence study is one of the most important parts. Studying the coexistence between LTE systens can provoid technical support not only for frequency allocation but also for network planning.This thesis mainly focuses on the interference analysis between the LTE FDD and FDD, FDD and TDD, TDD and TDD. Based on the technology charactistic, systematic interference analysis model is established. The power control, ACLR model and throughput calculation are introduced. Monte Carlo method is used to do the simulation. Macro celluler interfers Macro cellular and Macro cellular interfers Pico cellular are both studied. The studied interference links include not only BS to UE and UE to BS, but also BS to BS. The performance degradation due to the co-existence interference is quantified by comparing with single system scenarios. The isolation value is got to ensure the interferend system having good performance.