TU Darmstadt / ULB / TUbiblio

Practical Interference Alignment in the Frequency Domain for OFDM-based Wireless Access Networks

Loch, Adrian ; Nitsche, Thomas ; Kuehne, Alexander ; Hollick, Matthias ; Widmer, Joerg ; Klein, Anja (2014):
Practical Interference Alignment in the Frequency Domain for OFDM-based Wireless Access Networks.
In: Proceeding of IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks 2014,
IEEE, 15th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, Sydney, Australia, 19.06.2014, ISBN 978-1-4799-4786-7,
DOI: 10.1109/WoWMoM.2014.6918922,
[Conference or Workshop Item]

Abstract

Interference alignment (IA) is often considered in the spatial domain in combination with MIMO systems. In contrast, aligning interference in the frequency domain among multiple subcarriers can also benefit single-antenna OFDM-based access networks. It allows for flexible operation on a per-subcarrier basis. We investigate the gains achievable by frequency IA in practice for a scenario with multiple access points and clients. Previous work is predominantly theoretical and focuses on idealized cases where all nodes have the same average signal-to-noise ratio (SNR). On the contrary, in practical networks, nodes typically have heterogeneous SNRs depending on channel conditions, which might have a significant impact on IA performance. We tackle this problem by designing mechanisms that adaptively choose which nodes shall perform IA on which subcarriers depending on current channel conditions. We implement and validate our approach on software-defined radios. To the best of our knowledge, this is the first practical implementation of IA in the frequency domain. Our measurements show that (1) frequency IA is feasible in practice, and (2) choosing appropriate nodes and subcarriers overcomes the main limitations due to heterogeneous SNRs. Our mechanisms enable IA in scenarios where it would be infeasible otherwise, achieving throughput gains close to the 33% theoretical maximum.

Item Type: Conference or Workshop Item
Erschienen: 2014
Creators: Loch, Adrian ; Nitsche, Thomas ; Kuehne, Alexander ; Hollick, Matthias ; Widmer, Joerg ; Klein, Anja
Title: Practical Interference Alignment in the Frequency Domain for OFDM-based Wireless Access Networks
Language: English
Abstract:

Interference alignment (IA) is often considered in the spatial domain in combination with MIMO systems. In contrast, aligning interference in the frequency domain among multiple subcarriers can also benefit single-antenna OFDM-based access networks. It allows for flexible operation on a per-subcarrier basis. We investigate the gains achievable by frequency IA in practice for a scenario with multiple access points and clients. Previous work is predominantly theoretical and focuses on idealized cases where all nodes have the same average signal-to-noise ratio (SNR). On the contrary, in practical networks, nodes typically have heterogeneous SNRs depending on channel conditions, which might have a significant impact on IA performance. We tackle this problem by designing mechanisms that adaptively choose which nodes shall perform IA on which subcarriers depending on current channel conditions. We implement and validate our approach on software-defined radios. To the best of our knowledge, this is the first practical implementation of IA in the frequency domain. Our measurements show that (1) frequency IA is feasible in practice, and (2) choosing appropriate nodes and subcarriers overcomes the main limitations due to heterogeneous SNRs. Our mechanisms enable IA in scenarios where it would be infeasible otherwise, achieving throughput gains close to the 33% theoretical maximum.

Title of Book: Proceeding of IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks 2014
Publisher: IEEE
ISBN: 978-1-4799-4786-7
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Telecommunications
18 Department of Electrical Engineering and Information Technology > Institute for Telecommunications > Communications Engineering
20 Department of Computer Science
20 Department of Computer Science > Sichere Mobile Netze
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
LOEWE
LOEWE > LOEWE-Zentren
LOEWE > LOEWE-Zentren > CASED – Center for Advanced Security Research Darmstadt
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1053: MAKI – Multi-Mechanisms Adaptation for the Future Internet
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1053: MAKI – Multi-Mechanisms Adaptation for the Future Internet > C: Communication Mechanisms
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1053: MAKI – Multi-Mechanisms Adaptation for the Future Internet > C: Communication Mechanisms > Subproject C1: Network-centred perspective
Event Title: 15th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks
Event Location: Sydney, Australia
Event Dates: 19.06.2014
Date Deposited: 18 Aug 2014 09:29
DOI: 10.1109/WoWMoM.2014.6918922
Identification Number: MAKI-2014-005
Corresponding Links:
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details