Performance analysis of 3G systems in presence of UWB interference

In this paper, the impact of the interference from multiple ultra wideband (UWB) transmitters to a 3rd-generation (3G) terminal is evaluated under UWB emission power limit regulations of federal communications commission (FCC), european telecommunications standards institute (ETSI) and Japan respectively. A three-dimensional interference model is presented where a discrete spatial distribution of UWB transmitters is considered. It is assumed that a mobile terminal and a large number of UWB devices exist in one room simultaneously. A parameter which characterizes the link budget degradation at the victim receiver is defined to measure the UWB interference to 3G systems. The maximum acceptable density of UWB transmitters and the minimum acceptable distance between UWB transmitters and the 3G terminal are analyzed under different link budget degradations. The simulation results demonstrate that the performance of time division-synchronous code division multiple access (TD-SCDMA) is the best, the one of code division multiple access 2000 (CDMA2000) is the worst and the one of wideband code division multiple access (WCDMA) lies between them in presence of UWB interference.