Institute for Theoretical Information Technology

OFDM Networks

OFDM Networks strongly suffer from interference from neighboring cells using the same frequency band. Hence, network planning is important to support interference mitigation in the operating phase. The technical development even allows for reconfiguration of networks, though, the degrees of freedom are lower than in the planning phase. Frequency reuse schemes, partial frequency reuse schemes or no frequency reuse schemes as in LTE, where inter-cell interference coordination (ICIC) becomes very important, are used to alleviate interference. In modern (future) networks the ICIC shall be self-organized, see Self-organized Networks. In addition to the single cell investigations the cell association becomes an important issue.

Related research topics and publications

Cell Association

• S. Corroy, R. Mathar, Semidefinite Relaxation and Randomization for Dynamic Cell Association in Heterogeneous Networks, Proceedings: IEEE Global Communications Conference 2012 (GLOBECOM 2012), Anaheim, California, USA, December 2012.
• S. Corroy, L. Falconetti, R. Mathar, Dynamic Cell Association for Downlink Sum Rate Maximization in Multi-Cell Heterogeneous Networks, Proceedings: IEEE International Conference on Communications (ICC 2012), Ottawa, Canada, June 2012.
• S. Corroy, L. Falconetti, R. Mathar, Cell Association in Small Heterogeneous Networks: Downlink Sum Rate and Min Rate Maximization, Proceedings: IEEE Wireless Communications and Networking Conference (WCNC 2012), Paris, France, March 2012.

Frequency Reuse Schemes

• C. Liu, P. Wang, A. Schmeink, R. Mathar, Joint BS Selection and Subcarrier Assignment for Multicell Heterogeneous OFDM Unicasting, Proceedings: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Toronto, Canada, September 2011.

Reconfiguration

• A. Engels, M. Reyer, R. Mathar, Profit-Oriented Combination of Multiple Objectives for Planning and Configuration of 4G Multi-Hop Relay Networks, Proceedings: 7th International Symposium on Wireless Communication Systems (IEEE ISWCS), York, United Kingdom, September 2010.

Related projects

• Network Planning
• Self-organized Networks
• Self Organization for 4G Multi-Tier Networks

Related student work

• Master thesis Channel Quality Feedback Strategies for LTE Networks
• Master thesis Resourcenallokation in LTE-Netzen unter Berücksichtigung von Interferenz und heterogenem Verkehr
• Student research project A Study on Computational Complexity of Different Mobility Models in a Realistic Wireless Communication Environment
• Student reserach project Implementation of Mobility Models for Heterogeneous Cellular Networks in a Residential Area
• Diploma thesis Resource Allocation for Heterogeneous Transmission in Multicell OFDM Systems
• Bachelor thesis Algorithmen zur Ressourcenallokation in OFDM-Netzen unter Berücksichtigung von Interferenz
• Diploma thesis Algorithmic Resource Allocation for Multicell OFDM Systems with Spatially Separated Cells

Contact

For further information contact Michael Reyer.