Communication system design
Communication and information theories for digital and analog systems design
Frasco, L. A.↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Advances in gallium arsenide monolithic microwave integrated-circuit technology for space communications systems
Future communications satellites are likely to use gallium arsenide (GaAs) monolithic microwave integrated-circuit (MMIC) technology in most, if not all, communications payload subsystems. Multiple-scanning-beam antenna systems are expected to use GaAs MMIC's to increase functional capability, to reduce volume, weight, and cost, and to greatly improve system reliability. RF and IF matrix switch technology based on GaAs MMIC's is also being developed for these reasons. MMIC technology, including gigabit-rate GaAs digital integrated circuits, offers substantial advantages in power consumption and weight over silicon technologies for high-throughput, on-board baseband processor systems. In this paper, current developments in GaAs MMIC technology are described, and the status and prospects of the technology are assessed.
Bhasin, K. B.↗
Digital communication system
A digital communication system is reported for parallel operation of 16 or more transceiver units with the use of only four interconnecting wires. A remote synchronization circuit produces unit address control words sequentially in data frames of 16 words. Means are provided in each transceiver unit to decode calling signals and to transmit calling and data signals. The transceivers communicate with each other over one data line. The synchronization unit communicates the address control information to the transceiver units over an address line and further provides the timing information over a clock line. A reference voltage level or ground line completes the interconnecting four wire hookup.
Monford, L. G., Jr.↗
RCT: Module 2.02, Communication Systems [Slides]
Good communication skills are essential to an RCT. RCTs need to develop an ability to communicate using both verbal and non-verbal media. These skills will ensure important information is transmitted to the proper individuals in a clear and concise manner. This unit will provide an overview of communication systems at LANL.
99 GENERAL AND MISCELLANEOUS↗
RCT Module: 2.02 Communication Systems [Slides]
Good communication skills are essential to an RCT. RCTs need to develop an ability to communicate using both verbal and non-verbal media. These skills will ensure important information is transmitted to the proper individuals in a clear and concise manner. This unit will provide an overview of communication systems at LANL.
96 KNOWLEDGE MANAGEMENT AND PRESERVATION↗
The SAINT project - Preliminary design of an international satellite communication system
Economic synchronous communications satellite system in equatorial orbit for handling world telecommunications needs
SYNCHRONOUS SATELLITE SYSTEM↗
A 10.6-mu optical heterodyne communication system.
Optical heterodyne communication system with single mode and frequency carbon dioxide laser, noting coherent photon noise limit
Mocker, H. W.↗
Elimination of frequency shift in a multiplex communication system Patent
Multiplexed communication system design including automatic correction of transmission errors introduced by frequency spectrum shifts
Parker, G. L.↗
Radiofrequency testing of satellite segment of simulated 30/20 GHz satellite communications system
A laboratory communications system has been developed that can serve as a test bed for the evaluation of advanced microwave (30/20 GHz) components produced under NASA technology programs. The system will ultimately permit the transmission of a stream of high-rate (220 Mbps) digital data from the originating user, through a ground terminal, through a hardware-simulated satellite, to a receiving ground station, to the receiving user. This report contains the results of radiofrequency testing of the satellite portion of that system. Data presented include output spurious responses, attainable signal-to-noise ratios, a baseline power budget, usable frequency bands, phase and amplitude response data for each of the frequency bands, and the effects of power level variation.
Leonard, R. F.↗
Electronics systems test laboratory testing of shuttle communications systems
Shuttle communications and tracking systems space to space and space to ground compatibility and performance evaluations are conducted in the NASA Johnson Space Center Electronics Systems Test Laboratory (ESTL). This evaluation is accomplished through systems verification/certification tests using orbiter communications hardware in conjunction with other shuttle communications and tracking external elements to evaluate end to end system compatibility and to verify/certify that overall system performance meets program requirements before manned flight usage. In this role, the ESTL serves as a multielement major ground test facility. The ESTL capability and program concept are discussed. The system test philosophy for the complex communications channels is described in terms of the major phases. Results of space to space and space to ground systems tests are presented. Several examples of the ESTL's unique capabilities to locate and help resolve potential problems are discussed in detail.
Stoker, C. J.↗
Communication systems research at MSFC
Communication system research on hydrogen maser, solid state image converter, and telemetry signal propagation
IMAGE CONVERTER↗
Ultramicrowave communications system, phase 3
The ultramicrowave communications system program investigated the feasibility of a solid state system that meets the projected space to space requirements, while using the advantages of the 100 to 200 GHz band. The program successfully demonstrated a laboratory model of a high frequency communications system operating between 100 to 200 GHz. In the process, vendor claims for performance specifications of discrete components were evaluated, and a window was provided into system design and integration problems.
Source record↗
Studying impacts of communication system performance on dynamic stability of networked microgrid
The development of smart grid technologies has resulted in increased interdependence between power and communication systems. Many of the operations in the existing power system rely on a stable and secured communication system. For electrically weak systems and time‐critical applications, this reliance can be even greater, where a small degradation in communication performance can degrade system stability. However, despite inter‐dependencies between power and communication systems, only a few studies have investigated the impacts of communication system performance on power system dynamics. This study investigates the dependencies of power system dynamics operations on a communication system performance. First, a detailed, dynamic networked microgrid model is developed in the GridLAB‐D simulation environment, along with a representative multi‐traffic, multi‐channel, multi‐protocol communication system model, developed in the network simulator (ns‐3). Second, a hierarchical engine for large‐scale infrastructure co‐simulation framework is developed to co‐simulate microgrid dynamics, its communication system, and a microgrid control system. The impact of communication system delays on the dynamic stability of networked microgrids is evaluated for the loss of generation using three use‐cases. While the example use‐cases examine microgrid applications and the impact to resiliency, the framework can be applied to all levels of power system operations.
24 POWER TRANSMISSION AND DISTRIBUTION↗
Communication system modeling
This report presents the results of work on communications systems modeling and covers three different areas of modeling. The first of these deals with the modeling of signals in communication systems in the frequency domain and the calculation of spectra for various modulations. These techniques are applied in determining the frequency spectra produced by a unified carrier system, the down-link portion of the Command and Communications System (CCS). The second modeling area covers the modeling of portions of a communication system on a block basis. A detailed analysis and modeling effort based on control theory is presented along with its application to modeling of the automatic frequency control system of an FM transmitter. A third topic discussed is a method for approximate modeling of stiff systems using state variable techniques.
Holland, L. D.↗
A high data rate laser communication system.
High data rate laser communication system, discussing integration of laser and wideband modulator and experimental results under field conditions
COMMUNICATION SYSTEM↗
An adaptive on-off communication system.
Adaptive on-off communication system for binary data transmission over noisy channel of unknown attenuation
ADAPTIVE CONTROL↗
Communication systems and methods
A communication system is provided that includes a first quantum key distribution device and a communication device. The first quantum key distribution device is configured to be coupled to a second quantum key distribution device over a quantum channel and to generate a quantum key based on a quantum state transmitted along the quantum channel. The communication device is communicatively connected to the first quantum key distribution device within a network. The communication device is configured to receive the quantum key from the first quantum key distribution device and transmit the quantum key to an end device in the network via a classical link to enable the end device to use the quantum key for encrypting and/or decrypting messages communicated through the network.
97 MATHEMATICS AND COMPUTING↗