Advanced concepts for wireless communications present a vision of technology that
is embedded in our surroundings and practically invisible, but present whenever
required. From established radio techniques like GSM, 802.11, or Bluetooth to those
more recently emerging like ultra wideband (UWB) or smart dust motes, a common
denominator for future progress is underlying integrated circuit (IC) technology.
Although the use of deep submicron complementary metal oxide semiconductor
(CMOS) processes allows for an unprecedented degree of scaling in digital circuitry,
it complicates the implementation and integration of traditional radio frequency (RF)
circuits. The explosive growth of standard cellular radios and radically different new
wireless applications m