Ralph Crenshaw - Academia.edu (original) (raw)
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VTU Belgaum, Karnataka, INDIA
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Papers by Ralph Crenshaw
L'invention porte sur un procede et sur un appareil de modification d'un reseau de distri... more L'invention porte sur un procede et sur un appareil de modification d'un reseau de distribution de courant dans un bâtiment afin de generer une communication de donnees en utilisant un signal de courant porteur en ligne envoye a un point de localisation proche, central, electrique d'un systeme de distribution de courant distant du point d'entree des donnees du bâtiment. Un coupleur passif est relie a un panneau de service central et recoit le signal du courant porteur en ligne provenant du point d'entree eloigne au niveau du bâtiment et conditionne le signal pour l'entree au niveau du panneau de service sur chaque phase du reseau de distribution de courant.
International Journal of Satellite Communications, 1999
Current frequency allocations for non-geostationary mobile-satellites (NGSO-MSS) are all below 1 ... more Current frequency allocations for non-geostationary mobile-satellites (NGSO-MSS) are all below 1 GHz, a very crowded portion of the radio frequency spectrum. To the extent that feeder links to satellites in that service can use frequencies in bands above 1 GHz, the demand for additional spectrum below that point will be lessened. Feeder links can use higher bands that would be less desirable, or even unusable, for service links to the large number of small, low-power, user terminals with low-gain antennas envisaged for this service. Two possible bands above 1 GHz, 1390}1393 MHz and 1429}1432 MHz, are close to the 1400}1427 MHz band that is important to two passive (non-radiating) science services. To the extent that out-of-band emissions from NGSO MSS systems can be reduced to levels acceptable to the science services, the e$ciency of use of orbit and spectrum resources can be increased.
ABSTRACT A method for detecting multi-user signals including conducting a first energy burst dete... more ABSTRACT A method for detecting multi-user signals including conducting a first energy burst detection detecting a first plurality of user signals as a first energy burst, attempting to decode a user signal from the first plurality of signals within the first energy burst, cancelling out a first user signal from the first energy burst if the first user signal is successfully decoded from the first energy burst, determining a second user signal to be discarded if the second user signal is not successfully decoded from the first energy burst, conducting a second energy burst detection detecting a second plurality of signals as a second burst, and iteratively cancelling out the first user signal successfully decoded from the first energy burst from the second energy burst, wherein the second energy burst detection is conducted when all user signals within the first energy burst are either cancelled out or determined to be discarded.
L'invention porte sur un procede et sur un appareil de modification d'un reseau de distri... more L'invention porte sur un procede et sur un appareil de modification d'un reseau de distribution de courant dans un bâtiment afin de generer une communication de donnees en utilisant un signal de courant porteur en ligne envoye a un point de localisation proche, central, electrique d'un systeme de distribution de courant distant du point d'entree des donnees du bâtiment. Un coupleur passif est relie a un panneau de service central et recoit le signal du courant porteur en ligne provenant du point d'entree eloigne au niveau du bâtiment et conditionne le signal pour l'entree au niveau du panneau de service sur chaque phase du reseau de distribution de courant.
International Journal of Satellite Communications, 1999
Current frequency allocations for non-geostationary mobile-satellites (NGSO-MSS) are all below 1 ... more Current frequency allocations for non-geostationary mobile-satellites (NGSO-MSS) are all below 1 GHz, a very crowded portion of the radio frequency spectrum. To the extent that feeder links to satellites in that service can use frequencies in bands above 1 GHz, the demand for additional spectrum below that point will be lessened. Feeder links can use higher bands that would be less desirable, or even unusable, for service links to the large number of small, low-power, user terminals with low-gain antennas envisaged for this service. Two possible bands above 1 GHz, 1390}1393 MHz and 1429}1432 MHz, are close to the 1400}1427 MHz band that is important to two passive (non-radiating) science services. To the extent that out-of-band emissions from NGSO MSS systems can be reduced to levels acceptable to the science services, the e$ciency of use of orbit and spectrum resources can be increased.
ABSTRACT A method for detecting multi-user signals including conducting a first energy burst dete... more ABSTRACT A method for detecting multi-user signals including conducting a first energy burst detection detecting a first plurality of user signals as a first energy burst, attempting to decode a user signal from the first plurality of signals within the first energy burst, cancelling out a first user signal from the first energy burst if the first user signal is successfully decoded from the first energy burst, determining a second user signal to be discarded if the second user signal is not successfully decoded from the first energy burst, conducting a second energy burst detection detecting a second plurality of signals as a second burst, and iteratively cancelling out the first user signal successfully decoded from the first energy burst from the second energy burst, wherein the second energy burst detection is conducted when all user signals within the first energy burst are either cancelled out or determined to be discarded.