Valentin, Stefan, Hermann S. Lichte, Daniel Warneke, Thorsten Biermann, Rafael Funke, and Holger Karl. “Mobile Cooperative WLANs - MAC and Transceiver Design, Prototyping, and Field Measurements.”https://doi.org/10.1109/vetecf.2008.350__In 2008 IEEE 68th Vehicular Technology Conference. IEEE, 2008.https://doi.org/10.1109/vetecf.2008.350 .

Valentin, S., T. Freitag, and Holger Karl. “Integrating Multiuser Dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC Extensions and System Performance.”https://doi.org/10.1109/icc.2008.626__In 2008 IEEE International Conference on Communications. IEEE, 2008.https://doi.org/10.1109/icc.2008.626 .

Woldegebreal, Dereje H., and Holger Karl. “Network-Coding-Based Cooperative Transmission in Wireless Sensor Networks: Diversity-Multiplexing Tradeoff and Coverage Area Extension.”https://doi.org/10.1007/978-3-540-77690-1_9__In Lecture Notes in Computer Science, 141–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008.https://doi.org/10.1007/978-3-540-77690-1_9 .

H. Woldegebreal, Dereje, and Holger Karl. “Network-Coding-Based Cooperative Transmission in Wireless Sensor Networks: Diversity-Multiplexing Tradeoff and Coverage Area Extension.”https://doi.org/10.1007/978-3-540-77690-1_9__In Wireless Sensor Networks, 5th European Conference, EWSN 2008, Bologna, Italy, January 30-February 1, 2008, Proceedings, 141--155, 2008.https://doi.org/10.1007/978-3-540-77690-1_9 .

Valentin, Stefan, Thomas Freitag, and Holger Karl. “Integrating Multiuser Dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC Extensions and System Performance.”https://doi.org/10.1109/ICC.2008.626__In Proceedings of IEEE International Conference on Communications, ICC 2008, Beijing, China, 19-23 May 2008, 3328--3334, 2008.https://doi.org/10.1109/ICC.2008.626 .

S. Lichte, Hermann, Stefan Valentin, Holger Karl, Imad Aad, Luis Loyola, and J Widmer. “Design and Evaluation of a Routing-Informed Cooperative MAC Protocol for Ad Hoc Networks.”https://doi.org/10.1109/INFOCOM.2008.249__In INFOCOM 2008. 27th IEEE International Conference on Computer Communications, Joint Conference of the IEEE Computer and Communications Societies, 13-18 April 2008, Phoenix, AZ, USA, 1858--1866, 2008.https://doi.org/10.1109/INFOCOM.2008.249 .

Valentin, Stefan, Hermann S. Lichte, Holger Karl, Imad Aad, Luis Loyola, and J. Widmer. “Opportunistic Relaying vs. Selective Cooperation: Analyzing the Occurrence-Conditioned Outage Capacity.”https://doi.org/10.1145/1454503.1454539__In Proceedings of the 11th International Symposium on Modeling Analysis and Simulation of Wireless and Mobile Systems, MSWiM 2008, Vancouver, British Columbia, Canada, October 27-31, 2008, 193--202, 2008.https://doi.org/10.1145/1454503.1454539 .

Valentin, Stefan, Tobias Volkhausen, Furuzan Atay Onat, Halim Yanikomeroglu, and Holger Karl. “Decoding-Based Channel Estimation for Selective Cooperation Diversity Protocols.”https://doi.org/10.1109/PIMRC.2008.4699545__In Proceedings of the IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008, 15-18 September 2008, Cannes, French Riviera, France, 1--6, 2008.https://doi.org/10.1109/PIMRC.2008.4699545 .

Valentin, Stefan, Hermann S. Lichte, Daniel Warneke, Thorsten Biermann, Rafael Funke, and Holger Karl. “Mobile Cooperative WLANs - MAC and Transceiver Design, Prototyping, and Field Measurements.”https://doi.org/10.1109/VETECF.2008.350__In Proceedings of the 68th IEEE Vehicular Technology Conference, VTC Fall 2008, 21-24 September 2008, Calgary, Alberta, Canada, 1--5, 2008.https://doi.org/10.1109/VETECF.2008.350 .

H. Woldegebreal, Dereje, Stefan Valentin, and Holger Karl. “Incremental Network Coding in Cooperative Transmission Wireless Networks.”https://doi.org/10.1109/VETECF.2008.346__In Proceedings of the 68th IEEE Vehicular Technology Conference, VTC Fall 2008, 21-24 September 2008, Calgary, Alberta, Canada, 1--5, 2008.https://doi.org/10.1109/VETECF.2008.346 .

Platz, Daniel, Dereje H Woldegebreal, and Holger Karl. “Random Network Coding in Wireless Sensor Networks: Energy Efficiency via Cross-Layer Approach.” In Spread Spectrum Techniques and Applications, 2008 IEEE 10th International Symposium On, 654--660, 2008.

Valentin, Stefan, Tobias Volkhausen, Furuzan Atay Onat, Halim Yanikomeroglu, and Holger Karl. “Enabling Partial Forwarding by Decoding-Based One and Two-Stage Selective Cooperation.” In Communications Workshops, 2008. ICC Workshops’ 08. IEEE International Conference On, 129--133, 2008.

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 .