Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, 2010
ABSTRACT A femto access point (FAP) is a low-cost, low-power device in-tended to be installed by ... more ABSTRACT A femto access point (FAP) is a low-cost, low-power device in-tended to be installed by a home owner, to turn the home into a tiny wireless communication cell, that operates underneath a standard cell, in licensed spectrum bands. Femto-cells can improve user experience in ...
In any wireless communication environment in which a transmitter creates interference to the othe... more In any wireless communication environment in which a transmitter creates interference to the others, a system of non-linear equations arises. Its form (for 2 terminals) is p1=g1(p2;a1) and p2=g2(p1;a2), with p1, p2 power levels; a1, a2 quality-of-service (QoS) targets; and g1, g2 functions akin to "interference functions" in Yates (JSAC, 13(7):1341-1348, 1995). Two fundamental questions are: (1) does the system have a solution?; and if so, (2) what is it?. (Yates, 1995) shows that IF the system has a solution, AND the "interference functions" satisfy some simple properties, a "greedy" power adjustment process will always converge to a solution. We show that, if the power-adjustment functions have similar properties to those of (Yates, 1995), and satisfy a condition of the simple form gi(1,1,...,1)<1, then the system has a unique solution that can be found iteratively. As examples, feasibility conditions for macro-diversity and multiple-connection rec...
2007 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, 2007
Abstract Recently, ultra-wide-band (UWB) technology has been approved for communi-cation applica... more Abstract Recently, ultra-wide-band (UWB) technology has been approved for communi-cation applications, utilising spectrum in use by other technologies. Recent studies have evaluated the technological impact of UWB on UMTS, but not the corresponding economic impact. ...
2007 16th IST Mobile and Wireless Communications Summit, 2007
Abstract Existing regulations for ultra-wide-band technology make negligible its impact on incumb... more Abstract Existing regulations for ultra-wide-band technology make negligible its impact on incumbent networks. But compliant UWB devices are severely range-limited, and hence useful for a limited class of applications. More powerful UWB devices could be allowed in ...
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, 2010
ABSTRACT A femto access point (FAP) is a low-cost, low-power device in-tended to be installed by ... more ABSTRACT A femto access point (FAP) is a low-cost, low-power device in-tended to be installed by a home owner, to turn the home into a tiny wireless communication cell, that operates underneath a standard cell, in licensed spectrum bands. Femto-cells can improve user experience in ...
In any wireless communication environment in which a transmitter creates interference to the othe... more In any wireless communication environment in which a transmitter creates interference to the others, a system of non-linear equations arises. Its form (for 2 terminals) is p1=g1(p2;a1) and p2=g2(p1;a2), with p1, p2 power levels; a1, a2 quality-of-service (QoS) targets; and g1, g2 functions akin to "interference functions" in Yates (JSAC, 13(7):1341-1348, 1995). Two fundamental questions are: (1) does the system have a solution?; and if so, (2) what is it?. (Yates, 1995) shows that IF the system has a solution, AND the "interference functions" satisfy some simple properties, a "greedy" power adjustment process will always converge to a solution. We show that, if the power-adjustment functions have similar properties to those of (Yates, 1995), and satisfy a condition of the simple form gi(1,1,...,1)<1, then the system has a unique solution that can be found iteratively. As examples, feasibility conditions for macro-diversity and multiple-connection rec...
2007 2nd IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, 2007
Abstract Recently, ultra-wide-band (UWB) technology has been approved for communi-cation applica... more Abstract Recently, ultra-wide-band (UWB) technology has been approved for communi-cation applications, utilising spectrum in use by other technologies. Recent studies have evaluated the technological impact of UWB on UMTS, but not the corresponding economic impact. ...
2007 16th IST Mobile and Wireless Communications Summit, 2007
Abstract Existing regulations for ultra-wide-band technology make negligible its impact on incumb... more Abstract Existing regulations for ultra-wide-band technology make negligible its impact on incumbent networks. But compliant UWB devices are severely range-limited, and hence useful for a limited class of applications. More powerful UWB devices could be allowed in ...
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Papers by Virgilio Rodriguez