Drytkiewicz, W., Sroka, S., Handziski, V., Köpke, A., &; Karl, H. (2003). A mobility framework for omnet++. In 3rd International OMNeT++ workshop.

Gross, J., Klaue, J., Karl, H., &; Wolisz, A. (2003). Subcarrier allocation for variable bit rate video streams in wireless OFDM systems. In Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th (pp. 2481--2485).

Karl, H., Löbbers, M., &; Nieberg, T. (2003). A data aggregation framework for wireless sensor networks. In Proc. Dutch Technology Foundation ProRISC Workshop on Circuits, Systems and Signal Processing.

Klaue, J., Gross, J., Karl, H., &; Wolisz, A. (2003). Semantic-aware link layer scheduling of mpeg-4 video streams in wireless systems. In 3rd Workshop of Applications and Services in Wireless Networks 2003 (ASWN 2003).

Neumann, A., Fu, X., &; Karl, H. (2003). Prototype implementation and performance evaluation of a QoS-conditionalized handoff scheme for mobile IP networks. In Computer Communications, 2003. CCW 2003. Proceedings. 2003 IEEE 18th Annual Workshop on (pp. 24--29).

Aguiar, A. C. C., Hoene, C., Klaue, J., Karl, H., Miesmer, H., &; Wolisz, A. (2003). Channel-Aware Schedulers For Voip And Mpe For Wireless Communications. In Proc. of 8th Intl. Workshop on Mobile Multimedia Communications (MoMuC’03).

Köpke, A., Handziski, V., &; Karl, H. (2002).  Making sensor networks intelligent. In Proc. 7th Wireless World Research Forum (WWRF). Eindhoven/Netherlands.

Miesmer, H., Sanneck, H., Aguier, A., &; Karl, H. (2002). Concepts for a QoS-enabled, TCP/IP-oriented Link Layer in Beyond 3G Networks. In Proc. of 6th Wireless World Forum. London / GB.

Hollos, D., &; Karl, H. (2002). A HiperLAN/2 simulation model in OMNeT++. In Proc. of 2nd Intl. OMNet Workshop. Berlin .

Ngo-Quynh, T., Karl, H., Wolisz, A., &; Rebensburg, K. (2002). New Scheduling Algorithm for Providing Proportional Jitter in  Differentiated Service Network . In Proc. IST Mobile &; Wireless Telecommunications Summit 2002.

Fu, X., Karl, H., &; Kappler, C. (2002). QoS-Conditionalized Handoff for Mobile IP. In NETWORKING 2002, Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; and Mobile and Wireless Communications, Second International IFIP-T Networking Conference, Pisa, Italy, May 19-24, 2002, Proceedings (pp. 721--730).https://doi.org/10.1007/3-540-47906-6_58 

Hollos, D., &; Karl, H. (2002). A protocol extension to HiperLAN/2 to support single-relay networks. In Mobile Ad-Hoc Netzwerke, 1. deutscher Workshop über Mobile Ad-Hoc Netzwerke WMAN 2002, 25.-26. März 2002 in Ulm (pp. 91--107).

Xing, W., Karl, H., Wolisz, A., &; Müller, H. (2002). M-SCTP: Design and prototypical implementation of an end-to-end mobility concept. In In Proc. 5th Intl. Workshop The Internet Challenge: Technology and Applications (p. 43).

Quynh, T. N., Karl, H., Wolisz, A., &; Rebensburg, K. (2002). Using only Proportional Jitter Scheduling at the boundary of a Differentiated Service Network: simple and efficient. In Universal Multiservice Networks, 2002. ECUMN 2002. 2nd European Conference on (pp. 116--123).

Sroka, S., &; Karl, H. (2002). Using akaro with omnet++. In 2nd International OMNeT++ Workshop, Berlin, Germany.

Aguiar, A., Karl, H., &; Wolisz, A. (2002). Effects of prediction inaccuracy on the performance of channelstate-aware link layer schedulers. In Proc. of 1st Intl. Conf. on Mobile and Ubiquitous Multimedia (pp. 21--33).

Karl, H. (2001). Relaying in Wireless Access Networks –   A Capacity and Energy-Efficiency Perspective . In Proc. Wireless World Research Forum Kickoff Meeting (WWRF). München.

Karl, H. (2001). Relaying ñ bad for energy,  good for capacity? Rom/Italy: Eork-in-progress session of mobicom 2001.

Karl, H., &; Hentschel, T. (2001). IBMS 2 - Integriertes Bandbreiteneffizientes Mobiles Software-Radio System. In Zukunftsperspektiven der Mobilkommunikation, Symposium Bundesministerium für Bildung und Forschung.

Mengesha, S., Karl, H., &; Wolisz, A. (2001). Improving Goodput by Relaying in Transmission-Power-Limited Wireless Systems. In GI Jahrestagung (1) (pp. 537--544).