The Study in Capacity Analyse and Interference Coexistence for TD-LTE
|School||Beijing University of Posts and Telecommunications|
|Course||Signal and Information Processing|
|Keywords||TD-LTE Orthogonal Frequency-Division Multiplexing(OFDM) Multiple-Input Multiple-Output (MIMO) capacity interference coexistence|
High speed data service becomes development direction of wireless communication. Many states and many organizations spare no effort in this field. TD-LTE is a communication standard which belongs to China based on Long Term Evolution (LTE) technology of 3Gpp. It takes Time Division Duplex (TDD) as one of its technologies.Comparing with FDD(Frequency Division Duplex) LTE, TD-LTE choose Time Division Duplex as its duplex model. There are some differences between these two systems, such as Frame structure, radio resource distribution. These differences bring some advantage to TD-LTE. Of course, Orthogonal frequency-division multiplexing (OFDM) and Multiple-Input Multiple-Output (MIMO) are also its key technologies. Based on the two technologies, the frequency efficiency and throughput increase. Now, in these fields, there are many literatures introducing the content about OFDM and MIMO. In this paper, according to these contents, we analyze the system outage probability and capacity in different technologies. And, we also study the part about the coexistence performance of two LTE systems. The main work is as follows:Firstly, under the technology of OFDM, we analyze the system outage probability in different condition. According to Shannon theorem we get the user capacity and the system capacity.Secondly, as we know, the technology of MIMO contains two schemes:single-user MIMO and multiple-user MIMO. Under these two schemes, we get the capacity model, and provide the capacity value by numerical examples. Moreover, we also introduce some technologies come down to MIMO, such as pre-coding. Thirdly, in this part, we analyze the coexistence performance of two LTE systems which contains link model, antenna model, transmit model, evaluation method and so on. According to the simulation hypothesis of 3Gpp, we design a simulation platform, and provide some output results. Through these results, we can give some reference in future frequency planning.