| In the4G network planning, it is possible that TD-LTE and LTE FDD will coexist in adjacentfrequency bands. So, it is meaningful to research the coexistence interference.The interference between TD-LTE working under F-Band and LTE FDD working under1.8GHzis researched in this thesis. Firstly, basic concept and key technologies of LTE are introduced, basedon the analysis about spurious interference, blocking interference and inter-modulation interference,it can be shown that the mainly interference is spurious emission when the two systems are adjacentin frequency bands. Secondly, two methods of interference analysis are introduced, the Monte Carlosimulation method and certainty analysis method. And the interference isolation between the twoLTE base stations is evaluated by the latter. Then with the analysis of spurious interference withinthe system in each other’s working band, combined with3GPP standard, the conclusion can bedrawn that the two systems can be co-existing and this conclusion can be verified by the subsequentexperiments. Thus, recommendations are put forward to solve the interference problem in case thatthe two systems’ base station should be co-existing. Finally, summaries and prospects are given forthe development of hybrid network planning and optimization. |
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