Brain recordings in large animal models and humans typically rely on a tethered connection, which has restricted the spectrum of accessible experimental and clinical applications. To overcome this limitation, we have engineered a compact, lightweight, high data rate wireless neurosensor capable of recording the full spectrum of electrophysiological signals… (More)
—Pseudochaotic time hopping (PCTH) is a recently proposed encoding/modulation scheme for ultra-wideband (UWB) impulse radio. PCTH exploits concepts from symbolic dynamics to generate aperiodic spreading sequences, resulting in a noise-like spectrum. In this paper, we present a multiple-access technique suitable for the PCTH scheme. In particular, we provide… (More)
2010 iii DEDICATION To all those willing to wait for the fruits of their labor. iv EPIGRAPH When the facts change, I change my mind. What do you do, sir?
SUMMARY RF system and circuit approaches for cognitive radios, based on software defined radio technology, are discussed. The increasing use of digital techniques, combined with wideband data converters and tunable front-end technologies, will enable these systems to become cost effective in the coming years.
Founded in 1995 by the University of California, San Diego and Industrial Participants, the Center for Wireless Communications collaborates to identify emerging opportunities, pursue basic research, and transfer relevant technology for subsequent commercialization.