Coexistence Study On TD-SCDMA And WCDMA Systems

This paper is the subtopic of the research and application of the next generationtelecommunication network coverage key technology which is Tianjin science and technologyinnovation special funds project. It is mainly to study the issue of coexistence betweentelecommunication systems, analyze the impact of interference on the system capacity andpropose measures for improvement.With the increases of the number of mobile users and demand for mobile data, the thirdgeneration telecommunication network has been obtained rapid developments. There are threestandards for the generation telecommunication network adopted by the InternationalTelecommunication Union. They are TD-SCDMA, WCDMA and CDMA2000 respectively.They are used by different operator in China. And there are some frequency bands which havenot yet been used. Therefore, in order to ensure the system’s operation with high performance,it needs to study the coexistence between the different systems.This paper is mainly to study the issue of coexistence between TD-SCDMA system usingthe core frequency band and WCDMA system using the supplementary frequency band. It ismainly to complete the following work.1. This paper analyzed the causes of interference of coexistence systems, studied theinterference between the TD-SCDMA and WCDMA systems. In order to ensure the systemscan run in high performance, it got the additional isolation loss requirements for the twocoexistence systems.2. The TD-SCDMA system’s performance has been studied when it coexists withWCDMA system. The simulation model of the two coexistence systems has been established.The communication quality and system capacity have been analyzed under the coexistence ofthe two systems. At the same time, the effect of power control on the coexistence systemsperformance has been studied.3. Finally, the power control technology which has significant impacts on theTD-SCDMA system performance has been studied. In particular, inner loop power controltechnology of the uplink has been research. And the process of inner loop power control hasbeen also analyzed. In addition, the power control algorithms have been studied. It has beenimproved based on DCPC and CSOPC algorithm. From the results of simulation, it can beseen that the performance of the power control algorithm proposed in this paper has beenimproved significantly.