Interference Management for Wireless Networks Beyond Present Horizon (IMANET+) J. Hämäläinen, August 2013 Department of Communications and Networking

Transcription

1 Interference Management for Wireless Networks Beyond Present Horizon (IMANET+) J. Hämäläinen, August 2013 Department of Communications and Networking

2 IMANET researchers MSc Turo Halinen (until ) MSc Renauld-Alexander Pitaval MSc Byungjin Cho MSc Konstantinos Koufos Dr. Alexis Dowhuszko (Instructor work) Prof. Jyri Hämäläinen (scientific advisory) Prof. Olav Tirkkonen (scientific advisory) Prof. Riku Jäntti (scientific advisory)

3 WP1: Fundamental limits of wireless networks with interference Some Aalto topics: Codebook (CB) design for CoMP Fundamental bounds for precoding on Stiefel manifold Algebraic framework for creating large precoding codebooks Vector quantization for CBs performing simultaneous directional precoding (Grassmannian) and orthogonalization Characterization of the research: The work in WP was mainly basic research where aim was to achieve fundamental theoretical principles, justified by solid mathematical analysis Work was carried out by Renauld-Alexander Pitaval in research group of Prof. Olav Tirkkonen.

4 WP2: Decentralised radio network optimisation Aalto topics: Distributed beamforming for dense deployments in case of limited feedback. Special focus on clusters of local low power transmitters Design and analysis of practical limited feedback beamforming (precoding) methods Characterization of the research: The work was mainly basic research but our goal was to find principles that can be used when designing cooperative methods in ultra dense networks Work was carried out by Turo Halinen and Alexis Dowhuszko in the research group of Prof. Jyri Hämäläinen

5 WP2: System model for distributed BF Generalized system model composed by a main transmitter, a main receiver, and a cluster of relaying network elements (around main transmitter) Communication in the first hop assumed costless The feedback link between main receiver and relaying cluster enables the implementation of a DBF scheme in second hop

6 WP3: Interference statistics aware resource management Aalto topics: Power allocation, interference modeling, control and avoidance in cognitive radio networks, Special focus on systems that employ TV white space. Example problem: Estimate interference from random access networks to some incumbent system. Possible application in primary-secondary setup, co-primary shared access and license shared access Characterization of the research: Both basic and applied research done where goal was to find principles for credible interference modeling and means to reliably estimate the interference between secondary and primary TV WS system Work was carried out by Konstantinos Koufos and Byungjin Cho in the research group of Prof. Riku Jäntti

7 Aalto results T. Halinen: Distributed transmission for cooperative wireless networks, Licentiate Thesis, R.-A. Pitaval and O. Tirkkonen, Incorporating Stiefel Geometry in Codebook Design and Selection for Improved Base Station Cooperation, IEEE VTC-Spring 2012, published, journal version under preparation. R.-A. Pitaval and O. Tirkkonen, Joint Grassmann-Stiefel Codebook Design for Base Station Cooperation Precoding, under review in IEEE Transactions on Wireless Communications R.-A. Pitaval and O. Tirkkonen, Codebooks in Flag Manifolds for Limited Feedback MIMO Precoding, presented in SCC conference R.-A. Pitaval and O. Tirkkonen, Grassmannian Packings from Orbits of Projective Group Representations, accepted to Asilomar conf., Nov

8 Aalto results T. Halinen, A. Dowhuszko, J. Hämäläinen: Performance of Distributed Beamforming for Dense Relay Deployment in Presence of Limited Feedback, EURASIP Journal on Signal Processing, 2013:88. M. Husso, A. Dowhuszko, J. Hämäläinen: Combined Transmit Beamforming and Channel-Aware Scheduling for Interference Mitigation in Femtocells, EURASIP Journal on Wireless Communications and Networking, 2012:293. R.-A. Pitaval and O. Tirkkonen, Volume of Ball and Hamming-type Bounds for Stiefel Manifold with Euclidean Distance, accepted to Asilomar conf., Nov M. Husso, J. Hämäläinen, R. Jäntti, J. Nieminen, T. Riihonen, R. Wichman: Performance of On-Off Scheduling Strategy in Presence of Transmit Beamforming, Elsevier Physical Communication, Vol.4, No.1, pp. 3-12, March 2011.

9 Aalto results C. Karaiskos, A. Dowhuszko, J. Hämäläinen: Performance of Altruistic Beamforming for Mitigation of Multiple Cross-layer Interference Sources, accepted to IEEE International Conference on Communications - Wireless Communications Symposium ('ICC'13 WCS'), June B. Cho, K. Koufos, K. Ruttik, and R. Jäntti, Power allocation in the TV whitespace under constraint on secondary system self-interference, Journal of Electrical and Computer Engineering, B. Cho, K. Koufos, and R. Jäntti, Interference control in cognitive wireless networks by tuning the carrier sensing threshold, in Proc. Crowncom 2013, B. Cho, K. Koufos, K. Ruttik, and R. Jäntti, Modeling the interference generated from car base stations towards indoor femto-cells, submitted and under review

10 Aalto results B. Cho, K. Koufos, and R. Jäntti, "Bounding the Mean Interference in Matern type II Hard-Core Wireless Networks", submitted and under review Ongoing work: A. Dowhuszko, J. Hämäläinen: Distributed Beamforming with Binary Signaling for Interference Suppression, a draft initiative that serve as a basis for joint work with Aalto and CWC researchers. Work continued. A. Dowhuszko, F. Vitiello, J. Hämäläinen: Model for Admission Control in Heterogeneous Networks with Relay Nodes, a draft report to initiate new research on relaying. Work stopped since Federica is on maturity leave.

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