Bagayoko A.,The Optima |
Fijalkow I.,Cergy-Pontoise University |
Tortelier P.,Orange S.A.
IEEE Transactions on Signal Processing | Year: 2011
This paper addresses the spectrum-sharing for wireless communication where a cognitive or secondary user shares a spectrum with an existing primary user (and interferes with it). We propose two lower bounds, for the primary user mean rate, depending on the channel state information available for the secondary-user power control and the type of constraint for spectrum access. Several power control policies are investigated and the achieved primary-user mean rates are compared with these lower bounds. Specially, assuming all pairs of transmitterreceiver are achieving real-time delay-sensitive applications, we propose a novel secondary-user power control policy to ensure for both users, at a given occurrence, predefined minimum instantaneous rates. This power control uses only the secondary-user direct links gains estimations (secondary-to- secondary link and secondary-to-primary link). © 2011 IEEE. Source
Agency: GTR | Branch: Innovate UK | Program: | Phase: European | Award Amount: 8.41K | Year: 2011
The Optima | Date: 2015-02-18
A method, system and product for circuit simulation using a recording of a reference execution. The method comprises obtaining a design of a circuit, wherein the circuit comprises nodes which are assigned values during execution. The method further comprises obtaining a recording of a reference execution of the circuit, wherein the recording comprises recorded values of the nodes in a plurality of cycles. The method further comprises simulating, by a processor, an execution of the circuit, wherein said simulation is performed using the recorded values of the reference execution.
The Optima | Date: 2015-01-21
A method, system and product for determining error infliction probability or probability. The method comprises obtaining a representation of a circuit, wherein the circuit comprises nodes, wherein the nodes comprise at least one critical node; obtaining a trace, wherein the trace comprises recorded values of the nodes in a plurality of cycles; determining, by a processor, a Soft Error Infliction Probability (SEIP) of a node, wherein the SEIP is a value representing a probability that a Single Event Upset (SEU) effecting the node in a cycle will inflict a soft error by propagating through the circuit to the at least one critical node, wherein said determining comprises simulating a propagation of the SEU from the cycle to consecutive cycles, wherein said simulating utilizes values from the trace which are associated with the consecutive cycles; and outputting the SEIP of the node.
The Optima | Date: 2013-10-21
Systems and methods for placement of an introducer needle into the subclavian vein. A needle for subclavian vein penetration includes a straight needle portion, a bent needle portion, and a hub. The bent portion allows for needle placement with minimized chance of complications. The needle and hub form a lumen through which a guide wire can be placed. The bent needle portion has an inner diameter substantially similar to the inner diameter of the straight needle portion to reduce resistance due to movement of the guide wire.