Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Petri Eloranta Name of the doctoral dissertation Direct-Digital RF Modulator for Multi-Standard Radio Transmitters Publisher School of Electrical Engineering Unit Department of Micro and Nanosciences Series Aalto University publication series DOCTORAL DISSERTATIONS 186/2014 Field of research Electronic Circuit Design Manuscrip...

Cognitive radio is expected to be aware of the changing channel environment and adjust the services and resources accordingly by changing the radio's transmission parameters. In order to achieve automatic adaptation, the radio must have the ability to reason about the facts from the environment or from other radios/nodes, i.e. to infer implicit knowledge from the explicitly represented knowledg...

In conventional transmission schemes, the transmitter algorithms are a priori given, whereas the algorithms to be used by the receivers have to be a posteriori adapted. Such schemes can be termed transmitter (Tx) oriented and have the potential of simple transmitter implementations. The opposite to Tx orientation would be receiver (Rx) orientation in which the receiver algorithms are a priori g...

We investigate a cognitive radio scenario involving a single cognitive transmitter equipped with K antennas sharing the spectrum with M primary users (PUs) communicating with their respective receivers. Each terminal has a queue to store its incoming traffic. We propose a novel protocol where the cognitive user transmits its packet over a channel formed by the aggregate of the inactive (empty) ...

For a long time the capability of wireless devices to be configured either as a transmitter or a receiver at a time was the norm. The invention of full duplex shattered this norm. Theoretically, given N-RF chains with full-duplex capability, if each one can be configured as a receiver or a transmitter, we should be able to generate N transmission modes. Can a system capable of utilizing all pos...

Abstract: Abstract: Analog integration plays an important role in addressing new challenges faced by LTEAdvanced radio engineers. The 3rd Generation Partnership Project (3GPP) is working on Release 12 (Rel-12) of the LTE-Advanced standard. 3GPP Rel-12 includes many enhancements to 4G radio access technology including wideband carrier aggregation, multi-layer spatial multiplexing and advanced an...

Abstract: Analog integration plays an important role in addressing new challenges faced by LTE-Advanced radio engineers. The 3rd Generation Partnership Project (3GPP) is working on Release 12 (Rel-12) of the LTE-Advanced standard. 3GPP Rel-12 includes many enhancements to 4G radio access technology including wideband carrier aggregation, multi-layer spatial multiplexing and advanced antenna con...

Cognitive radio networks are being studied intensively. The major motivation for this is the heavily underutilized frequency spectrum. The development is being pushed forward by the rapid advances in software defined radio technology which enable a spectrum agile and highly configurable radio transmitter/receiver. We conduct a literature survey on recent major research advances in cognitive rad...