|Total Volume (kEUR)||520.0|
|Public Funding Rate (%)||72.6|
|Project Portfolio Number||I-5|
|Project Manager||CN=Czink\, Nicolai,OU=User,OU=-FTW-,DC=ftw,DC=local|
|Project Type||Non K-plus Publicly Funded|
Providing satisfactory indoor coverage of cellular networks in cities like Vienna is both difficult and costly. We propose cooperation between co-located mobile stations in a room or building to solve this problem. Such cooperation improves the link quality efficiently. It enables higher data rates in mobile broadband services for all cooperating users. We will measure and model the indoor-to-outdoor link, as well as the links between the cooperating nodes. Cooperative synchronization and collaborative transmission schemes will be analyzed and tested. We will demonstrate the feasibility of the most promising scheme on a real-time testbed.
- Nicolai Czink (project manager), FTW
- Fernando Andrés Sánchez González, FTW
- Florian Kaltenberger, EURECOM Institute, Sophia-Antipolis, France
- Claude Oestges, Université Catholique du Louvain, Louvain la Neuve, Belgium
- Thomas Zemen, FTW
Project Background & Motivation
Indoor coverage of wireless communication networks is difficult and costly to achieve in cities like Vienna. Radio waves are strongly attenuated by modern reinforced-concrete buildings but also by thick-walled old buildings. Currently, mobile network operators try to solve this problem by deploying additional base stations. This strategy is costly and unpopular among the local citizens. One promising approach to solve the problem on the users' side is by establishing cooperation between co-located mobiles, thus acting as nodes of an ad-hoc network. These nodes form a cooperating cluster, enabling a reliable link to a base station for all nodes, even if each node cannot reach the base station individually. Cooperation between nodes in a multi-hop fashion was already suggested as a general solution for coverage extension, but faced the skepticism of the potential users, which are not willing to cooperate without a benefit. In our case, all users being part of a cooperating cluster should intrinsically be willing to cooperate because they benefit by significantly enhancing the quality of their own link in this cooperation.
We will develop transmission schemes that collaboratively establish a reliable wireless link from a set of cooperating nodes to a base station not in reach from the individual devices. Particularly, we will focus on
- an unsynchronized initial state,
- unknown channel information at the users' side, and
- realistic propagation conditions.
Based on radio channel measurements, we will design novel channel models describing the cooperative links to the base station, and between the nodes. Using these models, we will develop timing and phase synchronization schemes based on synchronization mechanisms inspired by nature (e.g., firefly communication). We will investigate two different transmission methods under realistic propagation conditions: (i) collaborative beamforming, which needs phase synchronization, and (ii) asynchronous coding schemes, which require coarse timing synchronization. Finally, we will demonstrate one promising scheme on a real-time testbed.
Major Topics & Key Technologies
- Cooperative communications
- Distributed channel measurements
- Timing synchronization
- Collaborative beamforming
- Distributed space-time coding
- Demonstration on hardware testbed
- B. Bandemer, C. Oestges, N. Czink and A. Paulraj, "Physically motivated fast-fading model for indoor peer-to-peer channels", IET Electronics Letters, Vol. 45, pp. 515 - 517, May 2009.
- Florian Kaltenberger, Rizwan Ghaffar, Raymond Knopp, Hicham Anouar, Christian Bonnet, "Design and Implementation of a Single-frequency Mesh Network using OpenAirInterface", EURASIP Journal on Wireless Communications and Networking, vol. 2010, Article ID 719523, 16 pages, 2010. doi:10.1155/2010/719523.
- Claude Oestges, Nicolai Czink, Bernd Bandemer, Paolo Castiglione, Florian Kaltenberger, and Arogyaswami J. Paulraj, "Experimental Characterization and Modeling of Outdoor-to-Indoor and Indoor-to-Indoor Distributed Channels", IEEE Trans. on Vehicular Technology, 2010. (in press).
- Ankit Bhamri, Florian Kaltenberger, Raymond Knopp, Jyri Hämäläinen, "Smart Hybrid-ARQ (SHARQ) for Cooperative Communication via Distributed Relays in LTE-Advanced", SPAWC, San Francisco, USA, June 2011
- Nicolai Czink, Bernd Bandemer, Claude Oestges, Thomas Zemen and Arogyaswami Paulraj, "Subspace Modeling of Multi-User MIMO Channels", VTC 2011 Fall, San Francisco, USA, September 2011 (Submitted)
- F. Sánchez, A. Stephanides, N. Czink and C. Oestges, "Fast Fading Characterization for Indoor to Indoor and Outdoor to Indoor Channels", VTC2011-Fall, San Francisco, United States, September 2011.
- C. Oestges, P. Castiglione, and N. Czink, “Empirical modeling of nomadic peer-to-peer networks in office environment”, in VTC 2011 Spring, Budapest, Hungary, May 2011.
- M. Gan, N. Czink, P. Castiglione, C. Oestges, F. Tufvesson, and T. Zemen, “Modeling time-variant fast fading statistics of mobile peer-to-peer radio channels”, in VTC 2011 Spring, Budapest, Hungary, May 2011.
- F. Sánchez, T. Zemen, G. Matz, F. Kaltenberger, N. Czink, "Cooperative Space-Time Coded OFDM with Timing Errors and Carrier Frequency Offsets", IEEE International Conference on Communications ICC 2011, Kyoto, Japan, June 5-9, 2011.
- Florian Kaltenberger, Rizwan Ghaffar, Raymond Knopp, "Low-complexity Distributed MIMO Receiver and its Implementation on the OpenAirInterface Platform", IEEE PIMRC 2009, Tokyo, Japan, 13.-16.9.2009.
- Claude Oestges, Nicolai Czink, Bernd Bandemer, Paolo Castiglione, Florian Kaltenberger and Arogyaswami Paulraj, "Experimental Characterization of indoor multi-link channels," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC ’09 (Tokyo, Japan), September 2009.
- Claude Oestges, Nicolai Czink, Bernd Bandemer and Arogyaswami Paulraj, "Capacity performance of outdoor-to-indoor relay schemes in measured radio channels," IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC ’09 (Tokyo, Japan), September 2009.
- Nicolai Czink, Bernd Bandemer, Gonzalo Vazquez-Vilar, Louay Jalloul, Claude Oestges, Arogyaswami Paulraj, "Spatial Separation of Multi-User MIMO Channels", IEEE PIMRC 2009, Tokyo, Japan, Sep 14-16, 2009.
- F. Sánchez González, B. Bandemer, G. Matz, C. Oestges, F. Kaltenberger, N. Czink, "Performance of transmission-time optimized relaying schemes in real-world channels", 4th European Conference on Antennas and Propagation, EuCAP 2010, Barcelona, Spain, April 2010.
- P. Castiglione, C. Oestges, N. Czink, B. Bandemer, F. Kaltenberger, A. Paulraj, Multi-link level simulation model of indoor peer-to-peer radio channels, 4th European Conference on Antennas and Propagation, EuCAP 2010, Barcelona, Spain, April 2010.
- Florian Kaltenberger, Haiyon Jiang, Maxime Guillaud and Raymond Knopp, "Relative Channel Reciprocity Calibration in MIMO/TDD Systems," in Proc. ICT Future Network and Mobile Summit, Florence, Italy, June 2010.
- N. Czink, B. Bandemer, C. Oestges and A. Paulraj, "An Analytic Multi-User MIMO Channel Model Including Subspace Alignment," TD(10)11028, COST 2100 11th Management Committee Meeting, Aalborg, Denmark, 2.-4.6.2010.
- Florian Kaltenberger and Maxime Guillaud, "Exploitation of reciprocity in measured MIMO channels," TD(09)950, COST 2100 9th Management Committee Meeting, Vienna, Austria, 28.-30.9.2009.
- F. Sánchez González, B. Bandemer, G. Matz, C. Oestges, F. Kaltenberger, N. Czink, "Performance of transmission-time optimized relaying schemes in real-world channels", TD(10)10030, COST 2100 10th Management Committee Meeting, Athens, Greece, 3.-5.2.2010.
- P. Chambers, P. Castiglione, L. Liu, F. Mani, F. Quitin, O. Renaudin, F. Sanchez, N. Czink, C. Oestges, PUCCO Radio Measurement Campaign, TD(10)11015, COST 2100 11th Management Committee Meeting, Aalborg, Denmark, 2.-4.6.2010.