Lischka J, Karl H. A virtual network mapping algorithm based on subgraph isomorphism detection. In: Proceedings of the 1st ACM SIGCOMM Workshop on Virtualized Infrastructure Systems and Architectures, VISA 2009, Barcelona, Spain, August 17, 2009. ; 2009:81--88. doi:10.1145/1592648.1592662

Biermann T, Polgar ZA, Karl H. Cooperation and coding framework. In: Communications Workshops, 2009. ICC Workshops 2009. IEEE International Conference On. ; 2009:1--5.

Valentin S, Woldegebreal DH, Volkhausen T, Karl H. Combining for cooperative WLANs-a reality check based on prototype measurements. In: Communications Workshops, 2009. ICC Workshops 2009. IEEE International Conference On. ; 2009:1--5.

Volkhausen T, Woldegebreal DH, Karl H. Improving network coded cooperation by soft information. In: Sensor, Mesh and Ad Hoc Communications and Networks Workshops, 2009. SECON Workshops’ 09. 6th Annual IEEE Communications Society Conference On. ; 2009:1--6.

Warneke D, Dannewitz C. Statistics-based ID management for load balancing in structured P networks. In: 2009 IEEE 34th Conference on Local Computer Networks. IEEE; 2009. doi:10.1109/lcn.2009.5355086

Biermann T, Dannewitz C, Karl H. Extended Results on an Adaptive Resource/Performance Trade-Off for Resolving Complex Queries in P Networks.; 2008.

Brinkmann A, Gudenkauf S, Hasselbring W, et al. Employing WS-BPEL Design Patterns for Grid Service Orchestration using a Standard WS-BPEL Engine and a Grid Middleware. In: Proc. Cracow Grid Workshop (CGW). ; 2008:103-110.

Brinkmann A, Karl H, eds. Proceedings of the 1. GI/ITG KuVS Fachgespräch Virtualisierung. Paderborn Center for Parallel Computing, Paderborn University; 2008.

Valentin S, Lichte HS, Warneke D, Biermann T, Funke R, Karl H. Mobile Cooperative WLANs - MAC and Transceiver Design, Prototyping, and Field Measurements. In: 2008 IEEE 68th Vehicular Technology Conference. IEEE; 2008. doi:10.1109/vetecf.2008.350

Valentin S, Freitag T, Karl H. Integrating Multiuser Dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC Extensions and System Performance. In: 2008 IEEE International Conference on Communications. IEEE; 2008. doi:10.1109/icc.2008.626

Woldegebreal DH, Karl H. Network-Coding-Based Cooperative Transmission in Wireless Sensor Networks: Diversity-Multiplexing Tradeoff and Coverage Area Extension. In: Lecture Notes in Computer Science. Berlin, Heidelberg: Springer Berlin Heidelberg; 2008:141-155. doi:10.1007/978-3-540-77690-1_9

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

Valentin S, Freitag T, Karl H. Integrating Multiuser Dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC Extensions and System Performance. In: Proceedings of IEEE International Conference on Communications, ICC 2008, Beijing, China, 19-23 May 2008. ; 2008:3328--3334. doi:10.1109/ICC.2008.626

S. Lichte H, Valentin S, Karl H, Aad I, Loyola L, Widmer J. Design and Evaluation of a Routing-Informed Cooperative MAC Protocol for Ad Hoc Networks. 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. ; 2008:1858--1866. doi:10.1109/INFOCOM.2008.249

Valentin S, S. Lichte H, Karl H, Aad I, Loyola L, Widmer J. Opportunistic relaying vs. selective cooperation: analyzing the occurrence-conditioned outage capacity. 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. ; 2008:193--202. doi:10.1145/1454503.1454539

Valentin S, Volkhausen T, Atay Onat F, Yanikomeroglu H, Karl H. Decoding-based channel estimation for selective cooperation diversity protocols. 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. ; 2008:1--6. doi:10.1109/PIMRC.2008.4699545

Valentin S, S. Lichte H, Warneke D, Biermann T, Funke R, Karl H. Mobile Cooperative WLANs - MAC and Transceiver Design, Prototyping, and Field Measurements. In: Proceedings of the 68th IEEE Vehicular Technology Conference, VTC Fall 2008, 21-24 September 2008, Calgary, Alberta, Canada. ; 2008:1--5. doi:10.1109/VETECF.2008.350

H. Woldegebreal D, Valentin S, Karl H. Incremental Network Coding in Cooperative Transmission Wireless Networks. In: Proceedings of the 68th IEEE Vehicular Technology Conference, VTC Fall 2008, 21-24 September 2008, Calgary, Alberta, Canada. ; 2008:1--5. doi:10.1109/VETECF.2008.346

Platz D, Woldegebreal DH, Karl H. 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. ; 2008:654--660.

Valentin S, Volkhausen T, Onat FA, Yanikomeroglu H, Karl H. Enabling partial forwarding by decoding-based one and two-stage selective cooperation. In: Communications Workshops, 2008. ICC Workshops’ 08. IEEE International Conference On. ; 2008:129--133.

Eitzen F, Valentin S, Gossens K, Karl H, Rolfes O. Experimental Evaluation of IEEE 802.11a-Based WLANs for Medium Range Communication.; 2007.

Woldegebreal DH, Karl H. Multiple-Access Relay Channel with Network Coding and Non-Ideal Source-Relay Channels. In: 2007 4th International Symposium on Wireless Communication Systems. IEEE; 2007. doi:10.1109/iswcs.2007.4392437

Karl H. Optimizing sleeping intervals in preamble sampling MAC for WSNs. In: Bern / Switzerland: Communication in Distributed Systems (KiVS), 2007 ITG-GI Conference; 2007.

Festag A, Karl H, Wolisz A. Investigation of multicast-based mobility support in all-IP cellular networks. Wireless Communications and Mobile Computing. 2007;(3):319--339. doi:10.1002/wcm.328

van der Stok P, Karl H, De Ambroggi F, et al. WASP - Wirelessly Accessible Sensor Populations: A Project Overview. In: Constructing Ambient Intelligence - AmI 2007 Workshops Darmstadt, Germany, November 7-10, 2007 Revised Papers. ; 2007:426--429. doi:10.1007/978-3-540-85379-4_49

H. Woldegebreal D, Valentin S, Karl H. Outage probability analysis of cooperative transmission protocols without and with network coding: inter-user channels based comparison. 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. ; 2007:36--44. doi:10.1145/1298126.1298136

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

S. Lichte H, Valentin S, Eitzen F, Stege M, Unger C, Karl H. Integrating multiuser dynamic OFDMA into IEEE 802.11a and prototyping it on a real-time software-defined radio testbed. 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. ; 2007:1--9. doi:10.1109/TRIDENTCOM.2007.4444671

Valentin S, Karl H. Effect of User Mobility in Coded Cooperative Systems with Joint Partner and Cooperation Level Selection. In: IEEE Wireless Communications and Networking Conference, WCNC 2007, Hong Kong, China, 11-15 March, 2007. ; 2007:896--901. doi:10.1109/WCNC.2007.170

Marie Feeney L, Cetin B, Hollos D, Kubisch M, Mengesha S, Karl H. Multi-rate Relaying for Performance Improvement in IEEE 802.11 WLANs. In: Wired/Wireless Internet Communications, 5th International Conference, WWIC 2007, Coimbra, Portugal, May 23-25, 2007, Proceedings. ; 2007:201--212. doi:10.1007/978-3-540-72697-5_17

Valentin S, Karl H. 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 S, Lichte HS, Karl H, et al. Implementing cooperative wireless networks. Cognitive Wireless Networks. 2007:155--178. doi:10.1007/978-1-4020-5979-7_8

Valentin S, von Malm H, Karl H. Evaluating the GNU Software Radio Platform for Wireless Testbeds.; 2006.

Valentin S, Lichte HS, Karl H, et al. Cooperative wireless networking beyond store-and-forward: Perspectives for PHY and MAC design. In: ; 2006.

Dannewitz C, Berg S, Karl H. An IEEE 802.21-based Universal Information Service . In:  Proc. of the Wireless World Research Forum Meeting . ; 2006.

Hoene C, Karl H, Wolisz A. A perceptual quality model intended for adaptive VoIP applications. Int J Communication Systems. 2006;(3):299--316. doi:10.1002/dac.755

Gross J, Geerdes H-Florian, Karl H, Wolisz A. Performance analysis of dynamic OFDMA systems with inband signaling. IEEE Journal on Selected Areas in Communications. 2006;(3):427--436. doi:10.1109/JSAC.2005.862386

Carlson E, Prehofer C, Bettstetter C, Karl H, Wolisz A. A Distributed End-to-End Reservation Protocol for IEEE 802.11-Based Wireless Mesh Networks. IEEE Journal on Selected Areas in Communications. 2006;(11):2018--2027. doi:10.1109/JSAC.2006.881633

Mattern F, Karl H, Römer K. Wireless Sensor Networks. In: R\'22omer K, Karl H, Mattern F, eds. Third European Workshop, EWSN 2006, Zurich, Switzerland, February 13-15, 2006, Proceedings. Lecture Notes in Computer Science. ; 2006. doi:10.1007/11669463

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

Karl H, Willig A. Protocols and Architectures for Wireless Sensor Networks.; 2005.

Ebert J-P, Hollos D, Karl H, Löbbers M. Does Multi-Hop Communication Reduce Electromagnetic Exposure? Comput J. 2005;(1):72--83. doi:10.1093/comjnl/bxh062

Savoric M, Karl H, Schläger M, Poschwatta T, Wolisz A. Analysis and performance evaluation of the EFCM common congestion controller for TCP connections. Computer Networks. 2005;(2):269--294. doi:10.1016/j.comnet.2005.01.012

Gross J, Valentin S, Karl H, Wolisz A. A study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system. European Transactions on Telecommunications. 2005;(1):37--49. doi:10.1002/ett.1030

Karl H, Lentsch T, Ritter H. Drahtlose Sensornetze. Praxis der Informationsverarbeitung und Kommunikation. 2005;(2):66--67. doi:10.1515/PIKO.2005.66

Willig A, Karl H. Data Transport Reliability in Wireless Sensor Networks. A Survey of Issues and Solutions. Praxis der Informationsverarbeitung und Kommunikation. 2005;(2):86--92. doi:10.1515/PIKO.2005.86

Kopke A, Karl H, Lobbers M. Using energy where it counts: protecting important messages in the link layer. In: Wireless Sensor Networks, Second European Workshop, EWSN 2005, Istanbul, Turkey, January 31 - February 2, 2005, Proceedings. ; 2005:226--235. doi:10.1109/EWSN.2005.1462015

Karl H. Ad Hoc Networks. In: The Industrial Information Technology Handbook. ; 2005:1--16.

Valentin S, Gross J, Karl H, Wolisz A. Adaptive scheduling for heterogeneous traffic flows in cellular wireless OFDM-FDMA systems. In: 10th IFIP International Conference on Personal Wireless Communications/PWC’05, Comar, France, 2005. ; 2005.

Gross J, Valentin S, Karl H, Wolisz A. A study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system. European Transactions on Telecommunications. 2005;16(1):37-49. doi:10.1002/ett.1030