Improved Interference Alignment Performance for MIMO OFDM Systems by Multimode MIMO Antennas

authored by: Mohamed El-Hadidy, Mohammed El-Absi, Leen Sit, Markus Kock, Thomas Zwick, Holger Blume, Thomas Kaiser
Abstract: This contribution presents an improved Interference Alignment (IA) method for arbitrary MIMO-OFDM communication systems by exploiting spatial degrees of freedom of sophisticated multimode MIMO antennas. It is widely known that IA needs sufficient orthogonality between all the multi-user channels which is in typical indoor environments often not given due to insufficient spatial diversity. A significant improvement of the IA system performance has been achieved by using multimode MIMO antennas instead of classical and idealized omni-directional antennas. Such multimode MIMO antennas are capable to switch between different modes of the radiation patterns which significantly reduces the relevant channel coherence. Simulations of an indoor multi-user environment are carried out by a deterministic MIMO-OFDM channel model based on hybrid Electro Magnetic (EM) ray-tracing for being as close as possible to reality. Moreover, hardware implementation aspects are discussed as well demonstrating the feasibility of the overall IA based MIMO OFDM system.
Organisation(s): Institute of Microelectronic Systems
External Organisation(s): University of Duisburg-Essen
Karlsruhe Institute of Technology (KIT)
Type: Conference contribution
Publication date: 07.09.2012
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electrical and Electronic Engineering, Nuclear and High Energy Physics, Atomic and Molecular Physics, and Optics
Electronic version(s): https://ieeexplore.ieee.org/document/6293038 (Access: Closed)