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Physical-layer security | |||
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Joint source-channel coding | ||||
We focus on the design of joint Tanner graphs for source and channel coding for sources with memory. Dependencies from a Markov model are treated as further a-priori information linking variable nodes. Furthermore, we join source and channel polarization for combined source-channel coding. |
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Nonstationary interference treatment | |||
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DSL, Power-Line Communication, DMT, OFDM | ||||
Work in DSL and Power-Line Comm. focuses on problems of multicarrier transmission, like PAR reduction, time-domain equalization, bit-allocation, noise suppression, ... . To name just a few outcomes of this research: - First real capacity optimizing time-domain equalizer - PAR reduction scheme which is widely used (many million installations) - A bit-allocation scheme allowing for arbitrary SNR margins between priority classes - First MIMO-DMT proposal based on singular-value decomposition - Noise cancellation in DSL and power-line comm. - Communication scheme over DC power liens. - Multi-line fully automatic 24-pair cable measurement tool (ftw.) |
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Unequal error protecting codes | |||
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Analog codes and iterative decoding | ||||
We found that the iterative decoding of analog concatenated codes may be described as iterative projections realizing a least-mean-square solution. This allows for a very intuitive understanding of the iterative Turbo-like decoding procedures. Furthermore, we investigate the correction of bursty noise in additional background noise. |
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UEP network coding and routing | |||
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MIMO and Multiuser Communication | ||||
Our MIMO research focuses on the treatment of imperfect channel information and a possible realization of UEP properties just as in the case of multicarrier transmission. We consider multi-user bit loading, multi-user hierarchical modulation, LDPC coded hierarchical modulation. |
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Acoustical data transmission | |||
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The code of life | ||||
In a joint project with life sciences, we investigate the communications and code properties of the DNA. Our share deals with reasoning of the codon/aminoacid encoding structure, the error-protection, and source coding properties, whereas Prof. Mushelishvili's group concentrates more on the influences of the three dimensional orientation leading to analog control mechanisms in gene expression. |