Ultra Wide Bandwidth (UWB) spread-spectrum techniques are getting an increased importance due to their many desirable features such as high bit rates support and low power consumption. UWB is considered one enabling technology for advanced wireless local area networks providing integrated multimedia services to nomadic users over hot-spot areas. The assessment of the interference caused by UWB devices on already existing systems is fundamental to guarantee not conflicting coexistence and, therefore, the acceptance of this new technology worldwide. In this paper we use simulation to analyze the coexistence issues between and indoor UWB system and an outdoor fixed wireless access (FWA) system in the 3.5÷5.0 GHz frequency range. We consider a realistic UWB system architecture and we show that in many cases UWB system can coexist with FWA without causing dangerous interference.

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