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
LibreCat: /record/1834
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
LibreCat: /record/1839
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
LibreCat: /record/1841
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
LibreCat: /record/822
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
LibreCat: /record/823
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
LibreCat: /record/824
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
LibreCat: /record/825
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
LibreCat: /record/826
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
LibreCat: /record/827
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
LibreCat: /record/828
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.
LibreCat: /record/1003

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.
LibreCat: /record/1007

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
LibreCat: /record/1840
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.
LibreCat: /record/1842

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
LibreCat: /record/830
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
LibreCat: /record/831
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
LibreCat: /record/832
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
LibreCat: /record/833
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
LibreCat: /record/834
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
LibreCat: /record/835
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
LibreCat: /record/836
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.
LibreCat: /record/1015

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
LibreCat: /record/1018
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.
LibreCat: /record/2518

Valentin S, Lichte HS, Karl H, et al. Cooperative wireless networking beyond store-and-forward: Perspectives for PHY and MAC design. In: ; 2006.
LibreCat: /record/2523

Dannewitz C, Berg S, Karl H. An IEEE 802.21-based Universal Information Service . In:  Proc. of the Wireless World Research Forum Meeting . ; 2006.
LibreCat: /record/2526

Rammig F-J, Dangelmaier W, Karl H, Mertsching B, Meyer auf der Heide F, Trächtler A, eds. Self-Coordinating Systems: The Next Challenge in Research on Distributed Systems. Verlagsschriftenreihe des Heinz Nixdorf Instituts; 2006.
LibreCat: /record/17417

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
LibreCat: /record/837
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
LibreCat: /record/838
DOI: 10.1109/JSAC.2005.862386

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
LibreCat: /record/840
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.
LibreCat: /record/1843

Karl H, Willig A. Protocols and Architectures for Wireless Sensor Networks.; 2005.
LibreCat: /record/841

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
LibreCat: /record/842
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
LibreCat: /record/843
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
LibreCat: /record/844
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
LibreCat: /record/845
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
LibreCat: /record/846
DOI: 10.1515/PIKO.2005.86

Karl H. Ad Hoc Networks. In: The Industrial Information Technology Handbook. ; 2005:1--16.
LibreCat: /record/848

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.
LibreCat: /record/1013

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
LibreCat: /record/1378
DOI: 10.1002/ett.1030

Köpke A, Karl H, Wolisz A. Consensus in WSN – Identifying critical protocol mechanisms. In: GI / ITG Fachgespräche Drahtlose Sensornetzwerke. ; 2004.
LibreCat: /record/2529

Aguiar A, Karl H, Wolisz A. Channel Adaptive Techniques in the Presence of Channel Prediction Inaccuracy. In: Proceedings of European Wireless 2004, Barcelona / Spain . ; 2004.
LibreCat: /record/1911

Gross J, Klaue J, Karl H, Wolisz A. Cross-layer optimization of OFDM transmission systems for MPEG-4 video streaming. Computer Communications. 2004;(11):1044--1055. doi:10.1016/j.comcom.2004.01.010
LibreCat: /record/850
DOI: 10.1016/j.comcom.2004.01.010

Niebert N, Schieder A, Abramowicz H, et al. Ambient networks: An architecture for communication networks beyond 3G. IEEE Wireless Communications. 2004;(2):14--22. doi:10.1109/MWC.2004.1295733
LibreCat: /record/851
DOI: 10.1109/MWC.2004.1295733

Handziski V, Köpke A, Karl H, Frank C, Drytkiewicz W. 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. ; 2004:172--187. doi:10.1007/978-3-540-24606-0_12
LibreCat: /record/852
DOI: 10.1007/978-3-540-24606-0_12

Typpö V, Eisl J, Höller J, Agüero R, Karl H. 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. ; 2004:145--155. doi:10.1007/0-387-24043-8_15
LibreCat: /record/853
DOI: 10.1007/0-387-24043-8_15

Frank C, Karl H. 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. ; 2004:105--114. doi:10.1145/1023663.1023684
LibreCat: /record/854
DOI: 10.1145/1023663.1023684

Marie Feeney L, Hollos D, Kubisch M, Mengesha S, Karl H. 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. ; 2004:1312--1317. doi:10.1007/978-3-540-24693-0_112
LibreCat: /record/855
DOI: 10.1007/978-3-540-24693-0_112

Hollos D, Karl H, Wolisz A. 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. ; 2004:819--824. doi:10.1109/WCNC.2004.1311292
LibreCat: /record/856
DOI: 10.1109/WCNC.2004.1311292

Raguin D, Kubisch M, Karl H, Wolisz A. 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. ; 2004:1909--1914. doi:10.1109/WCNC.2004.1311845
LibreCat: /record/857
DOI: 10.1109/WCNC.2004.1311845