Interoperability analysis of 3rd generation mobile system in military applications
Publish date: 2001-02-14
Report number: FOA-R--00-01692-504
Pages: 25
Written in: Swedish
Abstract
It is likely that WCDMA (Wideband Code Division Multiple Access), in 3rd Generation Mobile System UMTS (Universal Mobile Telecommunications System) will be investigated as a possible technique for future military applications. In such applications, robustness against interference is one of several important features. By this reason, it is important to make an early judgement of the robustness of WCDMA against intersystem interference. The purpose of this report is to briefly analyze a WCDMA receiver´s sensitivity to interference in military applications. This work is an initial analysis, which will be continued with more thorough studies of the weaknesses the work suggests. The report consists of a survey of potential disturbance sources that might appear in military applications. Furthermore, estimations of the interference power in a mobile receiver from broadband interference and sine signal interference are presented. A number of system functions are identified as sensitive to interference. Furthermore, the impact of different interfering signal wave forms on the actual receiver is studied. It is shown that a WCDMA receiver is much more sensitive to Gaussian noise than to sine signals. It is stated that the interference levels from colocated COTS equipment can constitue a large threat to UNITS. Furthermore, power control and intitial cell search are identified as two important functions that can be highly affected by interference and should be further analyzed.