Keyword: Communication systems

Briefs: Physical Sciences
Attitude Estimation in Fractionated Spacecraft Cluster Systems

An attitude estimation was examined in fractioned free-flying spacecraft. Instead of a single, monolithic spacecraft, a fractionated free-flying spacecraft uses multiple spacecraft modules. These modules are connected only through wireless communication links and, potentially,...

Briefs: Mechanical & Fluid Systems

One of the major technical problems deep-space optical communication (DSOC) systems need to solve is the isolation of the optical terminal from vibrations produced by the spacecraft...

Briefs: Electronics & Computers

Systems that measure the angles of arrival of ultra-wideband (UWB) radio signals and perform triangulation by use of those angles in order to locate the sources of those signals are undergoing...

Articles: Electronics & Computers

In the design process, after the first prototype returns from fabrication, engineers often use traditional test equipment to make low-level measurements such as digital rise times, voltage...

Briefs: Photonics/Optics
Maximum Likelihood Time-of-Arrival Estimation of Optical Pulses via Photon-Counting Photodetectors

Many optical imaging, ranging, and communications systems rely on the estimation of the arrival time of an optical pulse. Recently, such systems have been increasingly employing photon-counting photodetector technology, which changes the statistics...

Application Briefs: Communications
The Communicator! NXT emergency
notification system
PlantCML, an EADS North America company
Franklin, TN
951-719-2423
...
Briefs: Software

Short-block low-density parity-check (LDPC) codes of a special type are intended to be especially well suited for potential applications that include transmission of command and control data, cellular...

Articles: Test & Measurement

Multi-paction effects can impact microwave components in high-power satellite communications (sat-com) systems. The nonlinear break-down-voltage phenomenon occurs in high-vacuum environments...

Application Briefs: Communications
DICES Subsystem Multiplexer (Sub-MUX) communications equipment
Quintron Systems
Santa Maria, CA
805-928-4343
www.quintron.com

NASA is installing Quintron’s...

Briefs: Photonics/Optics
Optical Structural Health Monitoring Device

This non-destructive, optical fatigue detection and monitoring system relies on a small and unobtrusive light-scattering sensor that is installed on a component at the beginning of its life in order to periodically scan the component in situ. The method involves using a laser beam to scan the surface...

Briefs: Electronics & Computers
Wavefront Correction for Large, Flexible Antenna Reflector

A wavefront-correction system has been proposed as part of an outer-space radio communication system that would include a large, somewhat flexible main reflector antenna, a smaller subreflector antenna, and a small array feed at the focal plane of these two reflector antennas. Part of...

Briefs: Electronics & Computers
A 311-GHz Fundamental Oscillator Using InP HBT Technology

This oscillator uses a single-emitter 0.3-μm InP heterojunction bipolar transistor (HBT) device with maximum frequency of oscillation (fmax) greater than 500 GHz. Due to high conductor and substrate losses at submillimeter-wave frequencies, a primary challenge is to...

Articles: Communications

Communications engineers today must design to accommodate changing missions, shorter product lifecycles, and increasing computer power. As a result, they create hybrid systems that include...

Briefs: Information Technology

Some non-traditional signal constellations have been proposed for transmission of data over the Additive White Gaussian Noise (AWGN) channel using such channel-capacity-approaching codes as low-density...

Articles: Electronics & Computers

With each new generation of FPGA devices, Xilinx continues to push the performance envelope to match the ever-increasing requirements of target applications. The recent announcement of the Virtex-6 is no exception....

Briefs: Information Technology

A method has been developed of computing bounds on the performance of a code comprised of two linear binary codes generated by two encoders serially concatenated through an...

Briefs: Information Technology

A recently developed algorithm for demodulation and decoding of a pulse-position-modulation (PPM) signal is suitable as a basis for designing a single hardware decoding apparatus to be capable of...

Application Briefs: Photonics/Optics

The TDM-to-packet network transformation has been underway in transport/ telecommunications networks for some years now, fueled primarily by two trends: (a) the advent of triple-play (voice, video,...

Briefs: Electronics & Computers

Two packaged monolithic microwave integrated-circuit (MMIC) mixers have been designed to operate as subharmonically pumped frequency down-converters in receivers of satellite- or...

Articles: Manufacturing & Prototyping

While automotive, aerospace, and high-tech equipment manufacturers are early adopters of wireless networks, the overall manufacturing industry has been...

Briefs: Information Technology

A method of constructing certain low-density parity-check (LDPC) codes by use of relatively simple loop-free coding modules has been developed. The subclasses of LDPC codes to which the...

Briefs: Information Technology

Low-density parity-check (LDPC) codes characterized by minimum Hamming distances proportional to block sizes have been demonstrated. Like the codes mentioned in the immediately...

Briefs: Physical Sciences

A method of dynamic self-locking has been demonstrated to be effective as a means of stabilizing the wavelength of light emitted by a vertical-cavity surface-emitting laser (VCSEL) that is an...

Briefs: Information Technology

A recently developed method of constructing protograph-based low-density parity-check (LDPC) codes provides for low iterative decoding thresholds and minimum distances proportional to...

Briefs: Software

In a proposed coding-and-modulation/ demodulation-and-decoding scheme for a free-space optical communication system, an error-correcting code of the low-density parity-check (LDPC) type would...

Articles: Software

The traditional engineering response to testing a new wireless standard often involves selecting a box instrument with the closest specifications. For automated test systems with...

Briefs: Information Technology

Efforts are under way to develop data- acquisition, data- processing, and data- communication systems for monitoring disasters over large geographic areas by use of uninhabited...

Articles: Electronics & Computers

Capacitive sensors can be used to measure many different physical parameters that are important when monitoring the health of patients. In particular, the technical advances made by sensor...

Application Briefs: Communications
Voice-over-IP communications system
Quintron
Santa Maria, CA
805-928-4343
www.quintron.com

Quintron was selected by NASA’s Ames Research Center (ARC)...

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