Study of Co-existent Interference for TD-LTE with Different System and Construction of Indoor Distribution
|School||South China University of Technology|
|Course||Electronics and Communication Engineering|
|Keywords||TD-LTE MCL Stray interference Block interference Isolation Interference avoidance Spatial segregation|
LTE is the evolution of 3G is a transition between 3G and 4G technology , is 3.9G 's global standards . TD-LTE uses OFDM , MIMO and higher order modulation and other key technologies , can improve the spectrum efficiency , greatly improving the user peak rate . TD-LTE indoor distribution system 2320 ~ 2370MHz, and WLAN band closely spaced , there is a certain degree of interference . Indoor coverage will be the focus and difficulty of the construction of TD-LTE . Indoor distribution system operators have built in the 2G/3G other system is of great significance for the introduction of the new TD-LTE system , the analysis of interference with other systems and avoidance measures . This paper analyzes the TD-LTE possible interference with other systems , and then theoretically calculated on all kinds of interference , we use the minimum coupling loss ( MCL ) interference between the studied system , according to the TD-LTE with a variety of systems between the stray interference indicators and blocking interference tolerance , calculated stray interference isolation requirements and blocking interference isolation , come to the end of the TD-LTE with different isolation requirements indicators . TD-LTE with different system interference isolation calculated , based on the results , combined with operators and manufacturers of network and equipment conditions , TD-LTE and WLAN interference test results from the test TD-LTE interference between WLAN indoor distribution system with different main TD-LTE system of the WLAN system interference , in particular interference between the TD-LTE and WLAN terminal is particularly serious . On the basis of theoretical analysis and test validation reasonable interference avoidance measures and recommendations the Combiner port isolation to meet the requirements when the TD-LTE with different systems share the room subsystem , Combiner port isolation does not meet the requirements, the need to add filters ; when the TD-LTE with different systems of subsystems with room , requiring spatial isolation between the use of TD-LTE antenna .