Essays about: "spatial propagation"

Showing result 31 - 35 of 38 essays containing the words spatial propagation.

  1. 31. Directional Spectrum Sensing and Transmission Using a Sector Antenna

    University essay from Institutionen för informationsteknologi och medier

    Author : Bilal Hasan Qureshi; [2012]
    Keywords : Spectrum Sensing; Ray-tracing and Sector Antennas;

    Abstract : Spectrum sensing plays a key role for radio resource awareness in cognitive radio. To enhance the capabilities of cognitive radio nodes, exploiting the spatial resource in addition to frequency and time re-sources seems reasonable. READ MORE

  3. 32. Multiantenna Time Of Arrival Estimation

    University essay from KTH/Signalbehandling

    Author : Ferran Torrent Fontbona; [2011]
    Keywords : ;

    Abstract : In the communications literature exist many documents that explain how to use spatial diversity to improve the performance of the system. However, the use of spatial diversity has not been studied in depth for GNSS, although in the last years the subject has received some interest, [6] and [20]. READ MORE

  4. 33. Distributed gateways for terabit/s satellite : Study of smart gateway diversity

    University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Author : Florian Romain Gain; [2011]
    Keywords : ;

    Abstract : Future Satcom systems will be required to provide Internet at high capacity to an increasing number of users. Because of demanding applications the throughput should approach the Tb/s. To achieve such a data rate, large bandwidths are required. So considering spectrum congestion below 15 GHz, communications should use Ka and Q/V bands. READ MORE

  5. 34. Ionospheric modification by powerful HF-waves : Underdense F-region heating by X-Mode

    University essay from Institutionen för fysik och astronomi

    Author : Henrik Löfås; [2008]
    Keywords : Ionosphere; Wave propagation; Radio science; Ionospheric propagation; Waves in plasma; EISCAT;

    Abstract : Observations of modifications of the electron temperature in the F-region produced by powerful high-frequency waves transmitted in X-mode are presented. The experiments were performed during quiet nighttime conditions with low ionospheric densities so no reflections occurred. READ MORE

  6. 35. Spatial correlation between lightning strikes and whistler observations

    University essay from KTH/Rymd- och plasmafysik

    Author : Jonas Öster; [2008]
    Keywords : ;

    Abstract : A whistler wave is a Very Low frequency (VLF) trace that obtains its characteristics from dispersive propagation in the magnetosphere. Field-aligned ducts of enhanced plasma density ensure the propagation from one hemisphere to the other. READ MORE