J. Lischka and H. Karl, “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, pp. 81--88.

T. Biermann, Z. A. Polgar, and H. Karl, “Cooperation and coding framework,” in Communications Workshops, 2009. ICC Workshops 2009. IEEE International Conference on, 2009, pp. 1--5.

S. Valentin, D. H. Woldegebreal, T. Volkhausen, and H. Karl, “Combining for cooperative WLANs-a reality check based on prototype measurements,” in Communications Workshops, 2009. ICC Workshops 2009. IEEE International Conference on, 2009, pp. 1--5.

T. Volkhausen, D. H. Woldegebreal, and H. Karl, “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, pp. 1--6.

D. Warneke and C. Dannewitz, “Statistics-based ID management for load balancing in structured P networks,” in 2009 IEEE 34th Conference on Local Computer Networks, 2009.

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

A. Brinkmann 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, pp. 103–110.

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

S. Valentin, H. S. Lichte, D. Warneke, T. Biermann, R. Funke, and H. Karl, “Mobile Cooperative WLANs - MAC and Transceiver Design, Prototyping, and Field Measurements,” in 2008 IEEE 68th Vehicular Technology Conference, 2008.

S. Valentin, T. Freitag, and H. Karl, “Integrating Multiuser Dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC Extensions and System Performance,” in 2008 IEEE International Conference on Communications, 2008.

D. H. Woldegebreal and H. Karl, “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, pp. 141–155.

D. H. Woldegebreal and H. Karl, “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, pp. 141--155.

S. Valentin, T. Freitag, and H. Karl, “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, pp. 3328--3334.

H. S. Lichte, S. Valentin, H. Karl, I. Aad, L. Loyola, and J. Widmer, “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, pp. 1858--1866.

S. Valentin, H. S. Lichte, H. Karl, I. Aad, L. Loyola, and J. Widmer, “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, pp. 193--202.

S. Valentin, T. Volkhausen, F. Atay Onat, H. Yanikomeroglu, and H. Karl, “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, pp. 1--6.

S. Valentin, H. S. Lichte, D. Warneke, T. Biermann, R. Funke, and H. Karl, “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, pp. 1--5.

D. H. Woldegebreal, S. Valentin, and H. Karl, “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, pp. 1--5.

D. Platz, D. H. Woldegebreal, and H. 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, 2008, pp. 654--660.

S. Valentin, T. Volkhausen, F. A. Onat, H. Yanikomeroglu, and H. Karl, “Enabling partial forwarding by decoding-based one and two-stage selective cooperation,” in Communications Workshops, 2008. ICC Workshops’ 08. IEEE International Conference on, 2008, pp. 129--133.

F. Eitzen, S. Valentin, K. Gossens, H. Karl, and O. Rolfes, Experimental evaluation of IEEE 802.11a-based WLANs for medium range communication. 2007.

D. H. Woldegebreal and H. Karl, “Multiple-Access Relay Channel with Network Coding and Non-Ideal Source-Relay Channels,” in 2007 4th International Symposium on Wireless Communication Systems, 2007.

H. Karl, “Optimizing sleeping intervals in preamble sampling MAC for WSNs,” 2007.

A. Festag, H. Karl, and A. Wolisz, “Investigation of multicast-based mobility support in all-IP cellular networks,” Wireless Communications and Mobile Computing, no. 3, pp. 319--339, 2007.

P. van der Stok 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, pp. 426--429.

D. H. Woldegebreal, S. Valentin, and H. Karl, “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, pp. 36--44.

S. Valentin, H. von Malm, and H. Karl, “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, pp. 1--6.

H. S. Lichte, S. Valentin, F. Eitzen, M. Stege, C. Unger, and H. Karl, “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, pp. 1--9.

S. Valentin and H. Karl, “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, pp. 896--901.

L. Marie Feeney, B. Cetin, D. Hollos, M. Kubisch, S. Mengesha, and H. Karl, “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, pp. 201--212.

S. Valentin and H. 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.

S. Valentin et al., “Implementing cooperative wireless networks,” Cognitive Wireless Networks, pp. 155--178, 2007.

S. Valentin, H. von Malm, and H. Karl, Evaluating the GNU Software Radio platform for wireless testbeds. 2006.

S. Valentin et al., “Cooperative wireless networking beyond store-and-forward: Perspectives for PHY and MAC design,” 2006.

C. Dannewitz, S. Berg, and H. Karl, “An IEEE 802.21-based Universal Information Service ,” in  Proc. of the Wireless World Research Forum Meeting , 2006.

C. Hoene, H. Karl, and A. Wolisz, “A perceptual quality model intended for adaptive VoIP applications,” Int. J. Communication Systems, no. 3, pp. 299--316, 2006.

J. Gross, H.-Florian Geerdes, H. Karl, and A. Wolisz, “Performance analysis of dynamic OFDMA systems with inband signaling,” IEEE Journal on Selected Areas in Communications, no. 3, pp. 427--436, 2006.

E. Carlson, C. Prehofer, C. Bettstetter, H. Karl, and A. Wolisz, “A Distributed End-to-End Reservation Protocol for IEEE 802.11-Based Wireless Mesh Networks,” IEEE Journal on Selected Areas in Communications, no. 11, pp. 2018--2027, 2006.

F. Mattern, H. Karl, and K. Römer, “Wireless Sensor Networks,” in Third European Workshop, EWSN 2006, Zurich, Switzerland, February 13-15, 2006, Proceedings, 2006.

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

H. Karl and A. Willig, Protocols and architectures for wireless sensor networks. 2005.

J.-P. Ebert, D. Hollos, H. Karl, and M. Löbbers, “Does Multi-Hop Communication Reduce Electromagnetic Exposure?,” Comput. J., no. 1, pp. 72--83, 2005.

M. Savoric, H. Karl, M. Schläger, T. Poschwatta, and A. Wolisz, “Analysis and performance evaluation of the EFCM common congestion controller for TCP connections,” Computer Networks, no. 2, pp. 269--294, 2005.

J. Gross, S. Valentin, H. Karl, and A. Wolisz, “A study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system,” European Transactions on Telecommunications, no. 1, pp. 37--49, 2005.

H. Karl, T. Lentsch, and H. Ritter, “Drahtlose Sensornetze,” Praxis der Informationsverarbeitung und Kommunikation, no. 2, pp. 66--67, 2005.

A. Willig and H. Karl, “Data Transport Reliability in Wireless Sensor Networks. A Survey of Issues and Solutions,” Praxis der Informationsverarbeitung und Kommunikation, no. 2, pp. 86--92, 2005.

A. Kopke, H. Karl, and M. Lobbers, “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, pp. 226--235.

H. Karl, “Ad Hoc Networks,” in The Industrial Information Technology Handbook, 2005, pp. 1--16.

S. Valentin, J. Gross, H. Karl, and A. Wolisz, “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.

J. Gross, S. Valentin, H. Karl, and A. Wolisz, “A study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system,” European Transactions on Telecommunications, vol. 16, no. 1, pp. 37–49, 2005.