| Our country distributed the frequency of 3G in October 2002.According to this project , SCDMA system and 3GFDD system (WCDMA system and CDMA2000 system) will near at several points of frequency. Because of the faultiness of transmitters and receivers, coexistent systems will bring interference to each other, and make the reduction of link's quality and system's capacity. So in November 2004, CCSA-TC5-WG1-SWG1 decided to begin to study the concomitance between SCDMA system and 3GFDD system.Firstly, in this paper,we introduce the background and the content of the interference study,includes SCDMA bases interfere 3G FDD bases and SCDMA terminals interfere 3G FDD bases. We only study voice operation in macro-cellular scenario. Then we present the essential characteristic of WCDMA system, CDMA2000 system and SCDMA system, specially the network configuration and main technique of SCDMA system.Secondly, we explain the reason of the interference is the faultiness of transmitters and receivers.We use two methods to calculate the interference, one is Minimum Coupling Loss method, the other is Monte Carlo method. Using Minimum Coupling Loss method, we get the needed ACIR between SCDMA system and CDMA system. The result is strict because the calculation is based on the worst situation. Monte Carlo method is the main method in this paper, we introduce the process and supposition in the later chapters. We circulate many snapshots to get the final result.The supposition is composed of the system deployment, system parameters, propagation model, smart antenna model, power control and capacity rule.Finally, the simulation results and resolution suggestions are supplied. |
