A new modulation technique called combinatorial pulse position modulation (CPPM) is
presented as a power-efficient alternating to quaternary pulse position modulation (QPPM) for …

To help increase the capacity and efficiency of the nation s airports, a secure wideband
wireless communications system is proposed for use on the airport surface. This paper provides …

There are hefty constraints levied on all space systems, and some of the most fundamental
of them are purely physical. Much of the literature published on optical communications for …

Due to its simplicity and robustness against wave-front distortion, pulse position modulation (PPM)
with photon counting detector has been seriously considered for long-haul optical …

The US Federal Aviation Administration (FAA) and Eurocontrol jointly initiated the future
communications study (FCS) to develop a common approach for a globally harmonized air traffic …

This paper summarizes recent activities to understand and establish technical standards for
a C-Band airport surface communications system based on the IEEE 802.16e standard for …

The utilization of frequency spectrum for space-to-ground communications applications has
generally progressed from the lowest available bands capable of supporting transmission …

The spatial and temporal resolution of digital computer systems interfaced to gamma cameras
and other nuclear medicine imaging devices are not adequate for clinical or research …

Methods of three-dimensional isotope distribution reconstruction from multiple two-dimensional
views are similar to those employed in astrophysics, electron microscopy, and radiology; …

Rationale: Acute lung injury and the acute respiratory distress syndrome are characterized
by increased lung oxidant stress and apoptotic cell death. The contribution of epithelial cell …