constellations
RSS constellationsIntelligent Routing and Bandwidth Allocation in Wireless Networks
White Paper Sensor networks and satellite constellations face a number of challenges for reliable and robust communications. Increasingly heterogeneous nodes and a multitude of new emerging Earth science applications put additional restrictions on throughput... [11 Jul 2008]
MPLS Networking for Non-GEO Satellite Constellations
White Paper The main advantage of satellite networks is that they provide large-area (up to global) coverage at competitive infrastructure costs. However, communication over geostationary satellites suffers from high free space attenuation and long delays. [10 Jul 2008]
Photos: Microsoft beams outer space to the desktop
Photo The main screen of the WorldWide Telescope contains stars visible to the human eye that are mapped into constellations. Microsoft has released a free public beta of its WorldWide Telescope, which is software that lets both amateur and professional... [19 May 2008]
Microsoft users surf the skies from the web
News The program is similar to Google Sky, a mode of Google Earth that offers views of the universe, including high-resolution photographs from the Hubble Space Telescope and background information on discoveries and constellations. [14 May 2008]
Multimedia Satellite Networks and TCP/IP Traffic Transport
White Paper A number of satellite communication systems have been proposed using geosynchronous (GEO) satellites, medium earth orbit (MEO) and low earth orbit (LEO) constellations operating in the Ka-band and above. [10 Apr 2008]
Sun breaks through supercomputer haze with Constellation
News After Tacc, Sun hopes to start selling Constellations to more customers. After a slight delay a new, somewhat unusual, supercomputer from Sun Microsystems will get formally unveiled next week. Photo stories [14 Feb 2008]
A Simulation Study of QoS for TCP Over LEO Satellite Networks With Differentiated Services
White Paper A number of satellite communication systems have been proposed using GEOsynchronous (GEO) satellites, Medium Earth Orbit (MEO) and Low Earth Orbit (LEO) constellations operating in the Ka-band and above. [14 Jan 2008]
TCP Via Satellite Constellations
Studies mainly concentrate on use of Geostationary Earth Orbit (GEO) constellations. However interest in use of Low Earth Orbit (LEO) constellations is increasing, especially for multimedia transmissions within the UMTS (Universal Mobile... [06 Dec 2007]
TCP Via Satellite Constellations
White Paper Studies mainly concentrate on use of Geostationary Earth Orbit (GEO) constellations. However interest in use of Low Earth Orbit (LEO) constellations is increasing, especially for multimedia transmissions within the UMTS (Universal Mobile... [05 Dec 2007]
Performance Evaluation of TCP Based Applications Using Double Constellation Geo/Leo Architecture
Satellite systems based on the use of geostationary (GEO) or Low Earth Orbit (LEO) constellations suffer from their intrinsic limitations in terms of coverage or flexibility. The implementation of an IP based worldwide network needs the... [05 Dec 2007]
Performance Evaluation of TCP Based Applications Using Double Constellation Geo/Leo Architecture
White Paper Satellite systems based on the use of geostationary (GEO) or Low Earth Orbit (LEO) constellations suffer from their intrinsic limitations in terms of coverage or flexibility. The implementation of an IP based worldwide network needs the... [04 Dec 2007]
Photos: The best of Google Sky
Photo The Google Sky application lets users navigate space in a similar way to Google Earth - with constellations drawn out and labelled to help cyber star gazers. Pictured is the 'Big Dipper' or 'Plough' constellation - depending on what side of the... [28 Nov 2007]
Space-Time-Frequency Transmit Diversity in Broadband Wireless OFDM Systems
White Paper Based on capacity considerations for Gaussian as well as real world signal constellations, it shows that the concatenation of an outer error control code, a bit interleaver and orthogonal spatial transmit diversity provides an attractive MIMO... [14 Apr 2007]
Joint Data Detection and Channel Estimation for OFDM Systems
White Paper This paper considers how the blind detector performs under mismatch, generalize the basic data detectors to nonunitary constellations, and extend them to systems with pilots and virtual carriers. The paper develops new blind and semi-blind data... [11 Apr 2007]
Construction of Non-Square M-QAM Sequences With Low PMEPR for OFDM Systems
White Paper After the mean envelope power for these sequences was computed, the general upper bound for the PMEPR of M-QAM sequences with non-square constellations was derived. The author considers the use of coding to reduce the Peak-to-Mean Envelope Power... [11 Apr 2007]
