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AWGN channel analysis of terminated LDPC convolutional codes

It has previously been shown that ensembles of terminated protograph-based low-density parity-check (LDPC) convolutional codes have a typical minimum distance that grows linearly with block length and that they are capable of achieving capacity approaching iterative decoding thresholds on the binary erasure channel (BEC). In this paper, we review a recent result that the dramatic threshold improve

Antropologiska porträtt

Möt kvinnorna och männen bakom de stora verken om mänskligheten: Margaret Mead, James Frazer, Knud Rasmussen, Claude Lévi-Strauss m.fl. Antropologiska porträtt är en serie biografiska essäer om antropologer skrivna av antropologer – en odyssé i tid och rum som spänner över två sekel från Amazonas och Thule till Mloda Polskas Kraków och intelligentsians Paris. Antropologiska porträtt är en lättillg

Scanning Tunneling Microscopy Induced Luminescence Studies of Semiconductor Nanostructures

This thesis treats scanning tunneling luminescence (STL) investigations of semiconductor nanostructures. The STL technique combines scanning tunneling microscopy (STM) with detection of photons, induced by the tunneling electrons. The high spatial resolution in STM and the local excitation allow for optical investigations on the nanometer-scale. The work concerns design and implementation of an o

On the necessity of barrier certificates

A methodology for safety verification of nonlinear systems using barrier certificates has been proposed recently. The condition was stated in a sufficiency form: if there exists a barrier certificate, then the system is safe, in the sense that there is no trajectory starting from a given set of initial states that reaches some given unsafe region. Using the concepts of convex duality and density,