Results 1 to 10 of about 13,582,991 (332)
Design and Simulation of Stellar Occultation Infrared Band Constellation
Remote Sensing, 2022 This study provides an in-depth analysis of the characteristics of stellar occultation events. Using 10 target star sources, the influence of orbital elements on the number, duration, and distribution of stellar occultation events was simulated and ...
Qinglin Zhu +3 more
doaj +1 more source
Understanding business strategies of networked value constellations using goal- and value modeling [PDF]
, 2006 In goal-oriented requirements engineering (GORE), one usually proceeds from a goal analysis to a requirements specification, usually of IT systems. In contrast, we consider the use of GORE for the design of IT-enabled value constellations, which are ...
Gordijn, Jaap +2 more
core +2 more sources
Joint Coding Design based on CSK and FSM
Guangtongxin yanjiu, 2021 In the Visible Light Communication (VLC) system based on circle Color Shift Keying (CSK) modulation constellation, the bit error rate performance is poorer under certain number of modulation order.
Jia-hui LI, Zong-yan LI, Shi-yin LI
doaj +3 more sources
Optimization of satellite resource scheduling under regional target coverage conditions
Open Astronomy, 2022 This study presented a mathematical description of an arbitrary shape area, and after analyzing the characteristics of the near-polar orbital co-ground trajectory constellation that satisfies the revisit interval constraint, an optimization model of the ...
Liu Kaixi +5 more
doaj +1 more source
Unitary Space-Time Modulation Based on Coherent Codes
Sensors, 2022 This paper analyzes the relationship between pilot symbol-assisted modulation (PSAM) and unitary space-time modulation (USTM). In particular, we present a map that transforms any PSAM into a USTM and vice versa.
Daniel Calabuig
doaj +1 more source
A Numerical Approach for Designing Unitary Space Time Codes with Large Diversity [PDF]
, 2002 A numerical approach to design unitary constellation for any dimension and any transmission rate under non-coherent Rayleigh flat fading channel.Comment: 32 pages, 6 ...
Han, Guangyue, Rosenthal, Joachim
core +1 more source
Tundra Constellation Design and Stationkeeping
Journal of Spacecraft and Rockets, 2005 Constellations of satellites in Tundra orbits provide an innovative alternative to the increasingly crowded geostationary orbit belt. The Tundra constellation uses three or more spacecraft in inclined geosynchronous orbits. The nominal orbit design for the constellation must minimize any undesirable perturbation effects to provide affordable ...
Michael J. Bruno, Henry J. Pernicka
openaire +3 more sources
IEEE Access, 2017 Physical-layer network coding holds the great potential of improving the power efficiency and the spectral efficiency for the two-stage transmission scheme. The first stage is the multiple access stage, where two source nodes (SN1 and SN2) simultaneously
Zhijiang Yu +4 more
doaj +1 more source
Mars Constellation Design and Low-Thrust Deployment Using Nonlinear Orbit Control
The Journal of the astronautical sciences, 2022 This research addresses the design of a Mars constellation composed of 12 satellites and devoted to telecommunications. While 3 satellites travel areostationary orbits, the remaining 9 satellites are placed in three distinct quasi-synchronous, inclined ...
M. Pontani, M. Pustorino, P. Teofilatto
semanticscholar +1 more source
Representation theory for high-rate multiple-antenna code design [PDF]
, 2000 Multiple antennas can greatly increase the data rate and reliability of a wireless communication link in a fading environment, but the practical success of using multiple antennas depends crucially on our ability to design high-rate space-time ...
Hassibi, Babak +3 more
core +4 more sources