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

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

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

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

van der Stok, P., Karl, H., De Ambroggi, F., Decotignie, J., Siegemund, F., Lokhorst, K., &; Hellenschmidt, M. (2007). WASP - Wirelessly Accessible Sensor Populations: A Project Overview. In Constructing Ambient Intelligence - AmI 2007 Workshops Darmstadt, Germany, November 7-10, 2007 Revised Papers (pp. 426--429).https://doi.org/10.1007/978-3-540-85379-4_49 

H. Woldegebreal, D., Valentin, S., &; Karl, H. (2007). 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 (pp. 36--44).https://doi.org/10.1145/1298126.1298136 

Valentin, S., von Malm, H., &; Karl, H. (2007). 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 (pp. 1--6).https://doi.org/10.1109/PIMRC.2007.4394223 

S. Lichte, H., Valentin, S., Eitzen, F., Stege, M., Unger, C., &; Karl, H. (2007). 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 (pp. 1--9).https://doi.org/10.1109/TRIDENTCOM.2007.4444671 

Valentin, S., &; Karl, H. (2007). 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 (pp. 896--901).https://doi.org/10.1109/WCNC.2007.170 

Marie Feeney, L., Cetin, B., Hollos, D., Kubisch, M., Mengesha, S., &; Karl, H. (2007). 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 (pp. 201--212).https://doi.org/10.1007/978-3-540-72697-5_17 

Valentin, S., &; Karl, H. (2007). 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).

Valentin, S., Lichte, H. S., Karl, H., Simoens, S., Vivier, G., Vidal, J., &; Agustin, A. (2007). Implementing cooperative wireless networks. Cognitive Wireless Networks, 155--178.https://doi.org/10.1007/978-1-4020-5979-7_8 

Valentin, S., von Malm, H., &; Karl, H. (2006). Evaluating the GNU Software Radio platform for wireless testbeds.

Valentin, S., Lichte, H. S., Karl, H., Vivier, G.,  Simoens, S., Vidal, J.,  Aad, I. (2006). Cooperative wireless networking beyond store-and-forward: Perspectives for PHY and MAC design.

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

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

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

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

Mattern, F., Karl, H., &; Römer, K. (2006). Wireless Sensor Networks. In K. R\'22omer, H. Karl, &; F. Mattern (Eds.), Third European Workshop, EWSN 2006, Zurich, Switzerland, February 13-15, 2006, Proceedings.https://doi.org/10.1007/11669463 

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

Karl, H., &; Willig, A. (2005). Protocols and architectures for wireless sensor networks.

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

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

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

Karl, H., Lentsch, T., &; Ritter, H. (2005). Drahtlose Sensornetze. Praxis Der Informationsverarbeitung Und Kommunikation, (2), 66--67.https://doi.org/10.1515/PIKO.2005.66 

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

Kopke, A., Karl, H., &; Lobbers, M. (2005). 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 (pp. 226--235).https://doi.org/10.1109/EWSN.2005.1462015 

Karl, H. (2005). Ad Hoc Networks. In The Industrial Information Technology Handbook (pp. 1--16).

Valentin, S., Gross, J., Karl, H., &; Wolisz, A. (2005). 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.

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

Köpke, A., Karl, H., &; Wolisz, A. (2004). Consensus in WSN – Identifying critical protocol mechanisms. In GI / ITG Fachgespräche Drahtlose Sensornetzwerke.

Aguiar, A., Karl, H., &; Wolisz, A. (2004). Channel Adaptive Techniques in the Presence of Channel Prediction Inaccuracy. In Proceedings of European Wireless 2004, Barcelona / Spain .

Gross, J., Klaue, J., Karl, H., &; Wolisz, A. (2004). Cross-layer optimization of OFDM transmission systems for MPEG-4 video streaming. Computer Communications, (11), 1044--1055.https://doi.org/10.1016/j.comcom.2004.01.010 

Niebert, N., Schieder, A., Abramowicz, H., Malmgren, G., Sachs, J., Horn, U.,https://doi.org/10.1109/MWC.2004.1295733__Karl, H. (2004). Ambient networks: An architecture for communication networks beyond 3G. IEEE Wireless Communications, (2), 14--22.https://doi.org/10.1109/MWC.2004.1295733 

Handziski, V., Köpke, A., Karl, H., Frank, C., &; Drytkiewicz, W. (2004). Improving the Energy Efficiency of Directed Diffusion Using Passive Clustering. In Wireless Sensor Networks, First European Workshop, EWSN 2004, Berlin, Germany, January 19-21, 2004, Proceedings (pp. 172--187).https://doi.org/10.1007/978-3-540-24606-0_12 

Typpö, V., Eisl, J., Höller, J., Agüero, R., &; Karl, H. (2004). Research Challenges in Mobility and Moving Networks: An Ambient Networks View. In Broadband Satellite Comunication Systems and the Challenges of Mobility - IFIP T Workshops on Broadband Satellite Communication Systems and Challenges of Mobility, World Computer Congress, August 22-27, 2004, Toulouse, France (pp. 145--155).https://doi.org/10.1007/0-387-24043-8_15 

Frank, C., &; Karl, H. (2004). Consistency challenges of service discovery in mobile ad hoc networks. In Proceedings of the 7th International Symposium on Modeling Analysis and Simulation of Wireless and Mobile Systems, MSWiM 2004, Venice, Italy, October 4-6, 2004 (pp. 105--114).https://doi.org/10.1145/1023663.1023684 

Marie Feeney, L., Hollos, D., Kubisch, M., Mengesha, S., &; Karl, H. (2004). A Geometric Derivation of the Probability of Finding a Relay in Multi-rate Networks. In NETWORKING 2004, Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communication, Third International IFIP-T Networking Conference, Athens, Greece, May 9-14, 2004, Proceedings (pp. 1312--1317).https://doi.org/10.1007/978-3-540-24693-0_112 

Hollos, D., Karl, H., &; Wolisz, A. (2004). Regionalizing global optimization algorithms to improve the operation of large ad hoc networks. In 2004 IEEE Wireless Communications and Networking Conference, WCNC 2004, Atlanta, Georgia, USA, 21-25 March 2004 (pp. 819--824).https://doi.org/10.1109/WCNC.2004.1311292 

Raguin, D., Kubisch, M., Karl, H., &; Wolisz, A. (2004). Queue-driven cut-through medium access in wireless ad hoc networks. In 2004 IEEE Wireless Communications and Networking Conference , WCNC 2004, Atlanta, Georgia, USA, 21-25 March 2004 (pp. 1909--1914).https://doi.org/10.1109/WCNC.2004.1311845 

Karl, H. (2004). Data Transmission in Mobile Communication Systems. In Location-Based Services (pp. 207--244).

Karl, H., Willig, A., &; Wolisz, A. (Eds.). (2004). Wireless Sensor Networks. First European Workshop, EWSN 2004, Berlin, Germany, January 19-21, 2004, Proceedings.https://doi.org/10.1007/b94854 

Niebert, N., Flinck, H., Hancock, R., Karl, H., &; Prehofer, C. (2004). Ambient Networks--Research for Communication Networks Beyond 3G. In 13th IST Mobile and Wireless Communications-Summit 2004.

Gross, J., Paoluzzi, I., Karl, H., &; Wolisz, A. (2004). Throughput study for a dynamic OFDM-FDMA system with inband signaling. In Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th (pp. 1787--1791).

Klimin, N., Enkelmann, W., Karl, H., &; Wolisz, A. (2004). A hybrid approach for location-based service discovery in vehicular ad hoc networks. Proc. of WIT.

Carlson, E., Karl, H., Wolisz, A., &; Prehofer, C. (2004). Distributed allocation of time slots for real-time traffic in a wireless multi-hop network. In Proc. European Wireless. Barcelona/Spain.

Mengesha, S., Karl, H., &; Wolisz, A. (2004). Capacity increase of multi-hop cellular wlans exploiting data rate adaptation and frequency recycling. Proc. of MedHocNet 2004.

Carlson, E., Bettstetter, C., Karl, H., Prehofer, C., &; Wolisz, A. (2004). Distributed maintenance of resource reservation paths in multihop 802.11 networks. In Vehicular Technology Conference, 2004. V-Fall. 2004 IEEE 60th (pp. 2994--2998).

Gross, J., Karl, H., &; Wolisz, A. (2004). On the effect of inband signaling and realistic channel knowledge on dynamic OFDM-FDMA systems. In European Wireless 2004.

Kubisch, M., Karl, H., &; Wolisz, A. (2004). A MAC protocol for wireless sensor networks with multiple selectable, fixed-orientation antennas. Frequenz, (3–4), 92--96.https://doi.org//10.1.1.3.3185