Eitzen, Falk, Stefan Valentin, Kai Gossens, Holger Karl, and Oliver Rolfes. Experimental Evaluation of IEEE 802.11a-Based WLANs for Medium Range Communication, 2007.

Woldegebreal, Dereje H., and Holger Karl. “Multiple-Access Relay Channel with Network Coding and Non-Ideal Source-Relay Channels.”https://doi.org/10.1109/iswcs.2007.4392437__In 2007 4th International Symposium on Wireless Communication Systems. IEEE, 2007.https://doi.org/10.1109/iswcs.2007.4392437 .

Karl, Holger. “Optimizing Sleeping Intervals in Preamble Sampling MAC for WSNs.” Bern / Switzerland: Communication in Distributed Systems (KiVS), 2007 ITG-GI Conference, 2007.

Festag, Andreas, Holger Karl, and Adam Wolisz. “Investigation of Multicast-Based Mobility Support in All-IP Cellular Networks.”https://doi.org/10.1002/wcm.328__Wireless Communications and Mobile Computing, no. 3 (2007): 319--339.https://doi.org/10.1002/wcm.328 .

Stok, Peter van der, Holger Karl, Fabio De Ambroggi, JeanDominique Decotignie, Frank Siegemund, Kees Lokhorst, and Michael Hellenschmidt. “WASP - Wirelessly Accessible Sensor Populations: A Project Overview.”https://doi.org/10.1007/978-3-540-85379-4_49__In Constructing Ambient Intelligence - AmI 2007 Workshops Darmstadt, Germany, November 7-10, 2007 Revised Papers, 426--429, 2007.https://doi.org/10.1007/978-3-540-85379-4_49 .

H. Woldegebreal, Dereje, Stefan Valentin, and Holger Karl. “Outage Probability Analysis of Cooperative Transmission Protocols without and with Network Coding: Inter-User Channels Based Comparison.”https://doi.org/10.1145/1298126.1298136__In Proceedings of the 10th International Symposium on Modeling Analysis and Simulation of Wireless and Mobile Systems, MSWiM 2007, Chania, Crete Island, Greece, October 22-26, 2007, 36--44, 2007.https://doi.org/10.1145/1298126.1298136 .

Valentin, Stefan, Holger von Malm, and Holger Karl. “Traffic-Aware Asymmetric Cooperation Diversity for Media Streaming in Wireless Networks.”https://doi.org/10.1109/PIMRC.2007.4394223__In Proceedings of the IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2007, 3-7 September 2007, Athens, Greece, 1--6, 2007.https://doi.org/10.1109/PIMRC.2007.4394223 .

S. Lichte, Hermann, Stefan Valentin, Falk Eitzen, Matthias Stege, Carsten Unger, and Holger Karl. “Integrating Multiuser Dynamic OFDMA into IEEE 802.11a and Prototyping It on a Real-Time Software-Defined Radio Testbed.”https://doi.org/10.1109/TRIDENTCOM.2007.4444671__In 3rd International ICST Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, TridentCom 2007, Orlando, Florida, USA, May 21-23 2007, 1--9, 2007.https://doi.org/10.1109/TRIDENTCOM.2007.4444671 .

Valentin, Stefan, and Holger Karl. “Effect of User Mobility in Coded Cooperative Systems with Joint Partner and Cooperation Level Selection.”https://doi.org/10.1109/WCNC.2007.170__In IEEE Wireless Communications and Networking Conference, WCNC 2007, Hong Kong, China, 11-15 March, 2007, 896--901, 2007.https://doi.org/10.1109/WCNC.2007.170 .

Marie Feeney, Laura, Bilge Cetin, Daniel Hollos, Martin Kubisch, Seble Mengesha, and Holger Karl. “Multi-Rate Relaying for Performance Improvement in IEEE 802.11 WLANs.”https://doi.org/10.1007/978-3-540-72697-5_17__In Wired/Wireless Internet Communications, 5th International Conference, WWIC 2007, Coimbra, Portugal, May 23-25, 2007, Proceedings, 201--212, 2007.https://doi.org/10.1007/978-3-540-72697-5_17 .

Valentin, Stefan, and Holger Karl. “Analyzing the Effect of Asymmetric Mobility and Channel Configurations on the Outage Performance of Coded Cooperative Systems.” In Proc. of the European Wireless Conference (EW), 2007.

Valentin, Stefan, Hermann S Lichte, Holger Karl, Sebastien Simoens, Guillaume Vivier, Josep Vidal, and Adrian Agustin. “Implementing Cooperative Wireless Networks.”https://doi.org/10.1007/978-1-4020-5979-7_8__Cognitive Wireless Networks, 2007, 155--178.https://doi.org/10.1007/978-1-4020-5979-7_8 .

Valentin, Stefan, Holger von Malm, and Holger Karl. Evaluating the GNU Software Radio Platform for Wireless Testbeds, 2006.

Valentin, Stefan, Herman S. Lichte, Holger Karl, Guillaume  Vivier, Sebastien  Simoens, Josep Vidal, Adrian Agustin, and Imad Aad. “Cooperative Wireless Networking beyond Store-and-Forward: Perspectives for PHY and MAC Design,” 2006.

Dannewitz, Christian, Stefan Berg, and Holger Karl. “An IEEE 802.21-Based Universal Information Service .” In  Proc. of the Wireless World Research Forum Meeting , 2006.

Hoene, Christian, Holger Karl, and Adam Wolisz. “A Perceptual Quality Model Intended for Adaptive VoIP Applications.”https://doi.org/10.1002/dac.755__Int. J. Communication Systems, no. 3 (2006): 299--316.https://doi.org/10.1002/dac.755 .

Gross, James, Hans-Florian Geerdes, Holger Karl, and Adam Wolisz. “Performance Analysis of Dynamic OFDMA Systems with Inband Signaling.”https://doi.org/10.1109/JSAC.2005.862386__IEEE Journal on Selected Areas in Communications, no. 3 (2006): 427--436.https://doi.org/10.1109/JSAC.2005.862386 .

Carlson, E., Christian Prehofer, Christian Bettstetter, Holger Karl, and Adam Wolisz. “A Distributed End-to-End Reservation Protocol for IEEE 802.11-Based Wireless Mesh Networks.”https://doi.org/10.1109/JSAC.2006.881633__IEEE Journal on Selected Areas in Communications, no. 11 (2006): 2018--2027.https://doi.org/10.1109/JSAC.2006.881633 .

Mattern, Friedemann, Holger Karl, and Kay Römer. “Wireless Sensor Networks.”https://doi.org/10.1007/11669463__In Third European Workshop, EWSN 2006, Zurich, Switzerland, February 13-15, 2006, Proceedings, edited by Kay R\'22omer, Holger Karl, and Friedemann Mattern. Lecture Notes in Computer Science, 2006.https://doi.org/10.1007/11669463 .

Aguiar, A., A. Wolisz, H. Lederer, and Holger Karl. “Channel-Adaptive Schedulers with State-of-the-Art Channel Predictors.” In Proceedings of the 11th European Wireless Conference 2005, 2005.