Future wireless systems must find ways to make use of the increase of availability of spectrum for wireless applications that can co-exist with higher-priority users. Such techniques include: (1) Ultra Wideband (UWB) which attempts to share the spectrum by transmitting at very low power so as not to interfere with narrow-band transmissions, (2) Cognitive Radios that use spectrum sampling techniques to transmit at a given time, place and frequency that is in between that of the other users, and (3) advances in CMOS technology that allow operation in higher frequency bands like 60 GHZ. In order to effectively make use of this new spectrum availability, designers must use a multidisciplinary approach making use of new algorithms and modulation techniques, reduced power circuits, new microwave techniques and other innovations.
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