News and events - Tampere University of Technology

Investigation of device-to-device integration into OFDMA-based cellular networks

In his dissertation, Lic.Tech. Hongnian Xing provides an overview of device-to-device (D2D) integration into OFDMA cellular systems, aiming to enhance the performance of systems like the 4th generation LTE network.

Until now, most of the terrestrial radio networks have been cellular-based. In order to meet the requirement of high user data rate and high user density, small cell operation is preferable to achieve local area transmission and reception. Dense deployment of small cells is one way to reach this goal. This method has been adopted to LTE and it is a central element in the development of future 5th generation networks. An alternative way is to utilize the concept of D2D communication within a radio network, i.e., direct communication between closely located user devices. Currently one strong research direction is to improve the cellular radio network efficiency by a D2D function.

For better spectrum efficiency and utilization, the emphasis is on underlay D2D-integrated systems, in which user devices in D2D mode share the same (licensed) band with normal cellular mode devices. Interference analysis and mitigation are therefore key issues that affect the overall performance of such integrated systems.

In his dissertation, Lic.Tech. Hongnian Xing analyzes interference scenarios and models of D2D-integrated LTE-like cellular systems. Some key issues related to interference management of the integrated system, including receiver algorithms, multiple access schemes, power control schemes, resource management methods, and power leakage effects, are investigated at both link level and system level. Some practical solutions for these issues are proposed.

Public defence of a doctoral dissertation on Friday, 31 March 2017

Lic.Tech. Hongnian Xing’s doctoral dissertation in the field of wireless communication, entitled “Contributions to OFDMA Cellular Network Integrated Device-to-Device Communication”, will be publicly examined at the Faculty of Computing and Electrical Engineering of Tampere University of Technology (TUT) in auditorium TB109 in the Tietotalo building (Korkeakoulunkatu 1) at 12 noon on Friday, 31 March 2017.

The opponent will be Professor Marcos Katz from Centre for Wireless Communications, University of Oulu, Oulu, Finland. Professor Markku Renfors from the Laboratory of Electronics and Communications Engineering (TUT) will act as Chairman.

Further information: Hongnian Xing, tel. +358 40 730 8926,

News submitted by: Sanna Kähkönen
Keywords: science and research, electronics and communications engineering