RESEARCH ACTIVITIES
Frans M.J. Willems

Petry Codes (co-author: Tjalling Tjalkens)
Datacompression and Repetition Times. First conference paper: “Repetition Times and Universal Data Compression,” Seventh Symposium on Information Theory in the Benelux, Noordwijkerhout, The Netherlands, May 22-23, 1986, pp. 73 – 80.
Modified Lawrence Codes (co-author: Tjalling Tjalkens)
Context (-Tree) Weighting Methods (principal co-authors: Yuri Shtarkov and Tjalling Tjalkens)
Coding for Piecewise Stationary Sources (co-authors: Franco Casadei and Marco Krom)

Write-Unidirectional Memories (co-authors: Han Vinck and Ineke van Overveld). First conference paper: “Repeated Recording for an Optical Disc,” Seventh Symposium on Information Theory in the Benelux, Noordwijkerhout, The Netherlands, May 22-23, 1986, pp. 49 - 53.
The Restricted Delay Bound (co-authors: Jan Bergmans and Guy Kerpen)
Shaping Codes (co-authors: Jos Wuijts and Brian de Bart)
Decoding Techniques (co-author: Aljosa Pasic)
Signaling for Parallel Channels Via an Input Permuter (with Alexei Gorokhov)

Coding for Networks

Informationtheoretical Results for Multiple Access Channels (Ph.D.-thesis, K.U. Leuven, advisor: Prof. Edward van der Meulen, 1982).
Computation of the Wyner-Ziv Function (auxiliary thesis, K.U. Leuven, advisor: Prof. Edward van der Meulen, 1982).
Feedback ("A coding scheme for the AWGN MAC with semi-feedback," with E.C. van der Meulen and J.P.M. Schalkwijk).
The Gaussian Channel with Causal Side-Information at the Transmitter (1988 and 2000).
Asynchronous Slepian-Wolf Communication
Coding Theorem for the AWGN Channel in Terms of Jointly Typical Sequences (10th Symp. on Inform. Th. in the Benelux, Houthalen, Belgium, May 25 & 26, 1989, Proc. pp. 13 - 18.). Tutorial paper, for stronger results, see Cover and Pombra, “Gaussian Feedback Capacity”, IEEE-IT, Jan. 1989, pp. 37-43.
Maximal and Average Error Probabilities for the Broadcast Channel (1990)
The Dependence-Balance Bound (co-author: Andries Hekstra)
Communication Via a Broadcasting Satellite, joint work with Aaron D. Wyner, Jack K. Wolf, appeared in IEEE Trans. Inform. Th., Special Issue on Shannon Theory, June 2002, pp. 1243 - 1249. Invited paper. Final version. These results were first presented at ISIT 1990 (ProcPage28, ProcPage29) San Diego. Network Coding “avant la lettre ... ”.
Data Embedding and Semantic Coding (co-workers: Dirk van de Borne, Martin van Dijk, Ton Kalker, Deran Maas)
Biometric Systems (co-workers: Tanya Ignatenko, Jasper Goseling, Ton Kalker, Jean-Paul Linnartz)

Keynote lecture at International Zurich Seminar on Communications, March 3-5, 2010. Three parts: A. Dependence Balance Bounds, B. Semantic Codes, C. Biometric Search Codes.