An Achievable Rate Region for Three-Pair Interference Channels with Noise

An achievable rate region for certain noisy three-user-pair interference channels is proposed. The channel class under consideration generalizes the three-pair deterministic interference channel (3-DIC) in the same way as the Telatar-Tse noisy two-pair interference channel generalizes the El Gamal-Costa injective channel. Specifically, arbitrary noise is introduced that acts on the combined interference signal before it affects the desired signal. This class of channels includes the Gaussian case. The rate region includes the best-known inner bound on the 3-DIC capacity region, dominates treating interference as noise, and subsumes the Han-Kobayashi region for the two-pair case.Comment: 9 pages, 3 figures; abbreviated version to be presented at IEEE International Symposium on Information Theory (ISIT 2012

Gaussian State Amplification with Noisy State Observations

The problem of simultaneous message transmission and state amplification in a Gaussian channel with additive Gaussian state is studied when the sender has imperfect noncausal knowledge of the state sequence. Inner and outer bounds to the rate--state-distortion region are provided. The coding scheme underlying the inner bound combines analog signaling and Gelfand-Pinsker coding, where the latter deviates from the operating point of Costa's dirty paper coding.Comment: 5 pages, 4 figures; submitted to IEEE International Symposium on Information Theory (ISIT 2013

A Comparison of Superposition Coding Schemes

There are two variants of superposition coding schemes. Cover's original superposition coding scheme has code clouds of the identical shape, while Bergmans's superposition coding scheme has code clouds of independently generated shapes. These two schemes yield identical achievable rate regions in several scenarios, such as the capacity region for degraded broadcast channels. This paper shows that under the optimal maximum likelihood decoding, these two superposition coding schemes can result in different rate regions. In particular, it is shown that for the two-receiver broadcast channel, Cover's superposition coding scheme can achieve rates strictly larger than Bergmans's scheme.Comment: 5 pages, 3 figures, 1 table, submitted to IEEE International Symposium on Information Theory (ISIT 2013

On the Capacity Region for Index Coding

A new inner bound on the capacity region of a general index coding problem is established. Unlike most existing bounds that are based on graph theoretic or algebraic tools, the bound is built on a random coding scheme and optimal decoding, and has a simple polymatroidal single-letter expression. The utility of the inner bound is demonstrated by examples that include the capacity region for all index coding problems with up to five messages (there are 9846 nonisomorphic ones).Comment: 5 pages, 6 figures, accepted to the 2013 IEEE International Symposium on Information Theory (ISIT), Istanbul, Turkey, July 201

On the Sum Capacity of A Class of Cyclically Symmetric Deterministic Interference Channels

Certain deterministic interference channels have been shown to accurately model Gaussian interference channels in the asymptotic low-noise regime. Motivated by this correspondence, we investigate a K user-pair, cyclically symmetric, deterministic interference channel in which each receiver experiences interference only from its neighboring transmitters (Wyner model). We establish the sum capacity for a large set of channel parameters, thus generalizing previous results for the 2-pair case.Comment: 5 pages; submitted to IEEE International Symposium on Information Theory (ISIT 2009

Die Hamburger HafenCity – Leben (in) der Zukunft?

Der Hamburger Hafen prägt die Wirtschaft und Optik der Stadt. Der stattfindende Strukturwandel von Gewerbebetrieben zu einer Mischung aus Wohnen und modernen Dienstleistungen soll Image prägend nicht nur für das Gebiet um den Hafen, sondern ganz Hamburg werden. Das städtebauliche Großprojekt HafenCity und insbesondere die Elbphilharmonie werden hier einer Analyse aus kulturanthropologischer Perspektive unterzogen

Die Hamburger HafenCity - Leben (in) der Zukunft?

Der Hamburger Hafen prägt die Wirtschaft und Optik der Stadt. Der stattfindende Strukturwandel von Gewerbebetrieben zu einer Mischung aus Wohnen und modernen Dienstleistungen soll Image prägend nicht nur für das Gebiet um den Hafen, sondern ganz Hamburg werden. Das städtebauliche Großprojekt HafenCity und insbesondere die Elbphilharmonie werden hier einer Analyse aus kulturanthropologischer Perspektive unterzogen