Prasanth Karunakaran

• Fraunhofer Institute for Integrated Circuits

Providing reliable low latency wireless links for advanced manufacturing and processing systems is a vision of Industry 4.0. Developing, testing and rating requires accurate models of the radio propagation channel. The current 3GPP-NR model as well as the QuaDRiGa model lack the propagation parameters for the industrial indoor scenario. To close th...

Reliability of wireless communication is the key to the next stages of the imminent industrial evolution known as Industry 4.0. Removing the bonds of cabling and wires will provide the ability of free movement and the possibility of deployment in previously unreachable locations. To build confidence in the reliability of wireless transmission syste...

Most of the existing wireless services operate in the 8 kHz - 5 GHz part of the electromagnetic spectrum. With the different regions of this band already being reserved for a myriad of wireless services, finding suitable spectrum for new services and the further development of existing services pose a significant challenge. Meanwhile, recent studie...

Given the prevalence of multicarrier waveforms in wireless systems, the sensing of such signals is of high importance for cognitive radio applications. In this work, we exploit periodic power boosting of subcarriers in multicarrier signals which is applied e.g. in LTE to improve the performance of sensing compared to state-of-the-art schemes under...

We explore the application of simultaneous sensing and reception (SSR) for cognitive communication in orthogonal frequency division multiplexing (OFDM) based wireless systems such as 3GPP LTE-A which may find application in multi-tier spectrum sharing paradigms such as the spectrum access system (SAS). In such a system, a cognitive radio (CR) synch...

Wearable wireless devices (WWDs) have been emerging as an important tool for future communication and control systems. When multiple uncoordinated WWD bearers exist in close proximity, the issue of interference between cochannel transmissions presents a major challenge. In this work, we exploit the molecular absorption (MA) regions of the Terahertz...

LTE-Unlicensed (LTE-U) involving the deployment of LTE in unlicensed bands has been gaining significant interest lately. The standardization of LTE-U has been proposed for Release 13 of 3GPP LTE. The two main requirements mandated for such an operation are the coexistence mechanisms with the WiFi systems and the sensing before transmission by an LT...

We consider the application of cognitive radio technology in future LTE-A systems. The carrier aggregation (CA) features of LTE-A can be exploited for enabling a cognitive operation in a subset of component carriers. Spectrum sharing between different network operators, device-to-device communications and the use of unlicensed bands for LTE-A are p...

In this work we present a case for dynamic spectrum sharing between different operators in systems with carrier aggregation (CA) which is an important feature in 3GPP LTE-A systems. Cross-carrier scheduling and sensing are identified as key enablers for such spectrum sharing in LTE-A. Sensing is classified as Type 1 sensing and Type 2 sensing and t...

We consider the problem of sensing in the presence of a desired signal in the context of future 3GPP LTE-A based cognitive cellular systems employing multiple-input multiple-output (MIMO) transmission. Energy detection (ED) based on equal gain combining and beamforming are investigated. Receive beamformers for energy detection (ED) are designed acc...

The advent of smartphones has brought about a new change in the traffic pattern of mobile users, for instance, there is a growing demand for high quality media content. In this paper, we consider a group of users within proximity of each other, who are interested in downloading the same content. Instead of the conventional cellular method of downlo...

In this paper, we investigate cooperative architectures and cloud formation mechanisms within the concept of mobile clouds, where multi-standard multi-radio devices in close proximity communicate to each other over short-range radio links while preserving connectivity to the overlay cellular network. Four architecture approaches are considered, nam...

Data reception over cellular and similar architectures is extremely power hungry, resulting in quick battery drain. In order to improve the quality of experience, the energy consumption has to be reduced. A mobile cloud, formed using cellular and short-range platforms of the mobiles is considered. It is shown that when all users of the cloud are ac...

Modern cellular networks are inherently interference limited, and therefore, pilot design is extremely important to the overall system performance. The pilots have to be carefully arranged and modulated to track the fading channel as well as to suppress the interference efficiently. 4G wireless systems based on OFDMA use pilot design strategies tha...