Network-Coding-Based Cooperative Transmission in Wireless Sensor Networks: Diversity-Multiplexing Tradeoff and Coverage Area Extension
D. H. Woldegebreal, H. Karl, in: Wireless Sensor Networks, 5th European Conference, EWSN 2008, Bologna, Italy, January 30-February 1, 2008, Proceedings, 2008, pp. 141--155.
LibreCat: /record/822
DOI: 10.1007/978-3-540-77690-1_9

Integrating Multiuser Dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC Extensions and System Performance
S. Valentin, T. Freitag, H. Karl, in: Proceedings of IEEE International Conference on Communications, ICC 2008, Beijing, China, 19-23 May 2008, 2008, pp. 3328--3334.
LibreCat: /record/823
DOI: 10.1109/ICC.2008.626

Design and Evaluation of a Routing-Informed Cooperative MAC Protocol for Ad Hoc Networks
H. S. Lichte, S. Valentin, H. Karl, I. Aad, L. Loyola, J. Widmer, 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.
LibreCat: /record/824
DOI: 10.1109/INFOCOM.2008.249

Opportunistic relaying vs. selective cooperation: analyzing the occurrence-conditioned outage capacity
S. Valentin, H. S. Lichte, H. Karl, I. Aad, L. Loyola, J. Widmer, 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.
LibreCat: /record/825
DOI: 10.1145/1454503.1454539

Decoding-based channel estimation for selective cooperation diversity protocols
S. Valentin, T. Volkhausen, F. Atay Onat, H. Yanikomeroglu, H. Karl, 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.
LibreCat: /record/826
DOI: 10.1109/PIMRC.2008.4699545

Mobile Cooperative WLANs - MAC and Transceiver Design, Prototyping, and Field Measurements
S. Valentin, H. S. Lichte, D. Warneke, T. Biermann, R. Funke, H. Karl, in: Proceedings of the 68th IEEE Vehicular Technology Conference, VTC Fall 2008, 21-24 September 2008, Calgary, Alberta, Canada, 2008, pp. 1--5.
LibreCat: /record/827
DOI: 10.1109/VETECF.2008.350

Incremental Network Coding in Cooperative Transmission Wireless Networks
D. H. Woldegebreal, S. Valentin, H. Karl, in: Proceedings of the 68th IEEE Vehicular Technology Conference, VTC Fall 2008, 21-24 September 2008, Calgary, Alberta, Canada, 2008, pp. 1--5.
LibreCat: /record/828
DOI: 10.1109/VETECF.2008.346

Random network coding in wireless sensor networks: Energy efficiency via cross-layer approach
D. Platz, D.H. Woldegebreal, H. Karl, in: Spread Spectrum Techniques and Applications, 2008 IEEE 10th International Symposium On, 2008, pp. 654--660.
LibreCat: /record/1003

Enabling partial forwarding by decoding-based one and two-stage selective cooperation
S. Valentin, T. Volkhausen, F.A. Onat, H. Yanikomeroglu, H. Karl, in: Communications Workshops, 2008. ICC Workshops’ 08. IEEE International Conference On, 2008, pp. 129--133.
LibreCat: /record/1007

Experimental evaluation of IEEE 802.11a-based WLANs for medium range communication
F. Eitzen, S. Valentin, K. Gossens, H. Karl, O. Rolfes, Experimental Evaluation of IEEE 802.11a-Based WLANs for Medium Range Communication, 2007.
LibreCat: /record/2515

Multiple-Access Relay Channel with Network Coding and Non-Ideal Source-Relay Channels
D.H. Woldegebreal, H. Karl, in: 2007 4th International Symposium on Wireless Communication Systems, IEEE, 2007.
LibreCat: /record/1840
DOI: 10.1109/iswcs.2007.4392437

Optimizing sleeping intervals in preamble sampling MAC for WSNs
H. Karl, in: Communication in Distributed Systems (KiVS), 2007 ITG-GI Conference, Bern / Switzerland, 2007.
LibreCat: /record/1842

Investigation of multicast-based mobility support in all-IP cellular networks
A. Festag, H. Karl, A. Wolisz, Wireless Communications and Mobile Computing (2007) 319--339.
LibreCat: /record/830
DOI: 10.1002/wcm.328

WASP - Wirelessly Accessible Sensor Populations: A Project Overview
P. van der Stok, H. Karl, F. De Ambroggi, J. Decotignie, F. Siegemund, K. Lokhorst, M. Hellenschmidt, in: Constructing Ambient Intelligence - AmI 2007 Workshops Darmstadt, Germany, November 7-10, 2007 Revised Papers, 2007, pp. 426--429.
LibreCat: /record/831
DOI: 10.1007/978-3-540-85379-4_49

Outage probability analysis of cooperative transmission protocols without and with network coding: inter-user channels based comparison
D. H. Woldegebreal, S. Valentin, H. Karl, 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.
LibreCat: /record/832
DOI: 10.1145/1298126.1298136

Traffic-Aware Asymmetric Cooperation Diversity for Media Streaming in Wireless Networks
S. Valentin, H. von Malm, H. Karl, 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.
LibreCat: /record/833
DOI: 10.1109/PIMRC.2007.4394223

Integrating multiuser dynamic OFDMA into IEEE 802.11a and prototyping it on a real-time software-defined radio testbed
H. S. Lichte, S. Valentin, F. Eitzen, M. Stege, C. Unger, H. Karl, 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.
LibreCat: /record/834
DOI: 10.1109/TRIDENTCOM.2007.4444671

Effect of User Mobility in Coded Cooperative Systems with Joint Partner and Cooperation Level Selection
S. Valentin, H. Karl, in: IEEE Wireless Communications and Networking Conference, WCNC 2007, Hong Kong, China, 11-15 March, 2007, 2007, pp. 896--901.
LibreCat: /record/835
DOI: 10.1109/WCNC.2007.170

Multi-rate Relaying for Performance Improvement in IEEE 802.11 WLANs
L. Marie Feeney, B. Cetin, D. Hollos, M. Kubisch, S. Mengesha, H. Karl, in: Wired/Wireless Internet Communications, 5th International Conference, WWIC 2007, Coimbra, Portugal, May 23-25, 2007, Proceedings, 2007, pp. 201--212.
LibreCat: /record/836
DOI: 10.1007/978-3-540-72697-5_17

Analyzing the effect of asymmetric mobility and channel configurations on the outage performance of coded cooperative systems
S. Valentin, H. Karl, in: Proc. of the European Wireless Conference (EW), 2007.
LibreCat: /record/1015

Implementing cooperative wireless networks
S. Valentin, H.S. Lichte, H. Karl, S. Simoens, G. Vivier, J. Vidal, A. Agustin, Cognitive Wireless Networks (2007) 155--178.
LibreCat: /record/1018
DOI: 10.1007/978-1-4020-5979-7_8

Evaluating the GNU Software Radio platform for wireless testbeds
S. Valentin, H. von Malm, H. Karl, Evaluating the GNU Software Radio Platform for Wireless Testbeds, 2006.
LibreCat: /record/2518

Cooperative wireless networking beyond store-and-forward: Perspectives for PHY and MAC design
S. Valentin, H.S. Lichte, H. Karl, G. Vivier, S.  Simoens, J. Vidal, A. Agustin, I. Aad, in: 2006.
LibreCat: /record/2523

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

A perceptual quality model intended for adaptive VoIP applications
C. Hoene, H. Karl, A. Wolisz, Int. J. Communication Systems (2006) 299--316.
LibreCat: /record/837
DOI: 10.1002/dac.755

Performance analysis of dynamic OFDMA systems with inband signaling
J. Gross, H.-Florian Geerdes, H. Karl, A. Wolisz, IEEE Journal on Selected Areas in Communications (2006) 427--436.
LibreCat: /record/838
DOI: 10.1109/JSAC.2005.862386

A Distributed End-to-End Reservation Protocol for IEEE 802.11-Based Wireless Mesh Networks
E. Carlson, C. Prehofer, C. Bettstetter, H. Karl, A. Wolisz, IEEE Journal on Selected Areas in Communications (2006) 2018--2027.
LibreCat: /record/839
DOI: 10.1109/JSAC.2006.881633

Wireless Sensor Networks
F. Mattern, H. Karl, K. Römer, in: K. R\'22omer, H. Karl, F. Mattern (Eds.), Third European Workshop, EWSN 2006, Zurich, Switzerland, February 13-15, 2006, Proceedings, 2006.
LibreCat: /record/840
DOI: 10.1007/11669463

Channel-Adaptive Schedulers with State-of-the-Art Channel Predictors
A. Aguiar, A. Wolisz, H. Lederer, H. Karl, in: Proceedings of the 11th European Wireless Conference 2005, 2005.
LibreCat: /record/1843

Protocols and architectures for wireless sensor networks
H. Karl, A. Willig, Protocols and Architectures for Wireless Sensor Networks, 2005.
LibreCat: /record/841

Does Multi-Hop Communication Reduce Electromagnetic Exposure?
J.-P. Ebert, D. Hollos, H. Karl, M. Löbbers, Comput. J. (2005) 72--83.
LibreCat: /record/842
DOI: 10.1093/comjnl/bxh062

Analysis and performance evaluation of the EFCM common congestion controller for TCP connections
M. Savoric, H. Karl, M. Schläger, T. Poschwatta, A. Wolisz, Computer Networks (2005) 269--294.
LibreCat: /record/843
DOI: 10.1016/j.comnet.2005.01.012

A study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system
J. Gross, S. Valentin, H. Karl, A. Wolisz, European Transactions on Telecommunications (2005) 37--49.
LibreCat: /record/844
DOI: 10.1002/ett.1030

Drahtlose Sensornetze
H. Karl, T. Lentsch, H. Ritter, Praxis Der Informationsverarbeitung Und Kommunikation (2005) 66--67.
LibreCat: /record/845
DOI: 10.1515/PIKO.2005.66

Data Transport Reliability in Wireless Sensor Networks. A Survey of Issues and Solutions
A. Willig, H. Karl, Praxis Der Informationsverarbeitung Und Kommunikation (2005) 86--92.
LibreCat: /record/846
DOI: 10.1515/PIKO.2005.86

Using energy where it counts: protecting important messages in the link layer
A. Kopke, H. Karl, M. Lobbers, in: Wireless Sensor Networks, Second European Workshop, EWSN 2005, Istanbul, Turkey, January 31 - February 2, 2005, Proceedings, 2005, pp. 226--235.
LibreCat: /record/847
DOI: 10.1109/EWSN.2005.1462015

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

Adaptive scheduling for heterogeneous traffic flows in cellular wireless OFDM-FDMA systems
S. Valentin, J. Gross, H. Karl, A. Wolisz, in: 10th IFIP International Conference on Personal Wireless Communications/PWC’05, Comar, France, 2005, 2005.
LibreCat: /record/1013

A study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system
J. Gross, S. Valentin, H. Karl, A. Wolisz, European Transactions on Telecommunications 16 (2005) 37–49.
LibreCat: /record/1378
DOI: 10.1002/ett.1030

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

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

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

Ambient networks: An architecture for communication networks beyond 3G
N. Niebert, A. Schieder, H. Abramowicz, G. Malmgren, J. Sachs, U. Horn, C. Prehofer, H. Karl, IEEE Wireless Communications (2004) 14--22.
LibreCat: /record/851
DOI: 10.1109/MWC.2004.1295733

Improving the Energy Efficiency of Directed Diffusion Using Passive Clustering
V. Handziski, A. Köpke, H. Karl, C. Frank, W. Drytkiewicz, in: Wireless Sensor Networks, First European Workshop, EWSN 2004, Berlin, Germany, January 19-21, 2004, Proceedings, 2004, pp. 172--187.
LibreCat: /record/852
DOI: 10.1007/978-3-540-24606-0_12

Research Challenges in Mobility and Moving Networks: An Ambient Networks View
V. Typpö, J. Eisl, J. Höller, R. Agüero, H. Karl, 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, pp. 145--155.
LibreCat: /record/853
DOI: 10.1007/0-387-24043-8_15

Consistency challenges of service discovery in mobile ad hoc networks
C. Frank, H. Karl, 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, pp. 105--114.
LibreCat: /record/854
DOI: 10.1145/1023663.1023684

A Geometric Derivation of the Probability of Finding a Relay in Multi-rate Networks
L. Marie Feeney, D. Hollos, M. Kubisch, S. Mengesha, H. Karl, 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, pp. 1312--1317.
LibreCat: /record/855
DOI: 10.1007/978-3-540-24693-0_112

Regionalizing global optimization algorithms to improve the operation of large ad hoc networks
D. Hollos, H. Karl, A. Wolisz, in: 2004 IEEE Wireless Communications and Networking Conference, WCNC 2004, Atlanta, Georgia, USA, 21-25 March 2004, 2004, pp. 819--824.
LibreCat: /record/856
DOI: 10.1109/WCNC.2004.1311292

Queue-driven cut-through medium access in wireless ad hoc networks
D. Raguin, M. Kubisch, H. Karl, A. Wolisz, in: 2004 IEEE Wireless Communications and Networking Conference , WCNC 2004, Atlanta, Georgia, USA, 21-25 March 2004, 2004, pp. 1909--1914.
LibreCat: /record/857
DOI: 10.1109/WCNC.2004.1311845

Data Transmission in Mobile Communication Systems
H. Karl, in: Location-Based Services, 2004, pp. 207--244.
LibreCat: /record/858