Time-domain maximum-likelihood (ML) estimators of time and frequency offsets are derived for three orthogonal frequency division multiplexing (OFDM) signal models: a pulse-shaped one-shot OFDM signal, a stream of multiple OFDM signals and an OFDM signal in a dispersive channel environment. We then develop structures to simplify their implementation. Simulation results show the relative performance

Popular Abstract in Swedish Hur lär vi oss ett nytt språk och hur påverkas språkinlärningen av de språk vi kan sedan tidigare? Syftet med denna avhandling är att undersöka hur utvecklingsstadier i inlärningen av ordformer och ordföljd i ett språk påverkas av tidigare inlärda språk (s.k. transfer). Avhandlingen undersöker dels transfer av modersmålet (L1) och dels transfer av andra tidigare förvärvThe aim of this thesis is to examine how learner-general developmental stages in syntax and morphology interact with a language-specific factor, the influence of—or transfer from— the language learner’s first (L1) or previously learned second (L2) language on the acquisition of a third language (L3). It thereby aims to bring together two lines of research whose main concepts—transfer and developme

Retinitis Pigmentosa involves a hereditary degeneration of photoreceptors by as yet unresolved mechanisms. The secretable protein α-Klotho has a function related to ageing processes, and α-Klotho deficient mice have reduced lifespan and declining functions in several tissues. Here, we studied Klotho in connection with inherited photoreceptor degeneration. Increased nuclear immunostaining for α-Klo

Designers focus on fashion and appearance, whereas safety and protection engineers and physiologists emphasize functions in terms of developing functional and protective clothing. Phase change materials (PCMs) have been used in textiles and clothing to achieve cooling or warming function. The objective of this paper was to compare effectiveness of PCM cooling or warming determined by critical fact

Fuel cells are promising for future energy systems, since they are energy efficient and, when hydrogen is used as fuel, there are no emissions of greenhouse gases. Fuel cells have during recent years various improvements, however the technology is still in the early phases of development. This can be noted by the lack of a dominant design both for singe fuel cells, stacks and for entire fuel cell

Abstract in Undetermined Archaeological research on pre-Christian religion has increased greatly during the last two decades. Studies of ritual and religion appear frequently in scholarly, popular and antiquarian publications of the 1990s. Selected publications in Scandinaviau archaeology are presented in order to characterise and discuss different approaches. Central theoretical and methodologica

The T-matrix method is applied to the problem of scattering of Rayleigh-Lamb modes from a twodimensional cavity in an elastic plate. A formal solution is obtained which is valid also for non-planar surfaces. Explicit expressions and numerical results are given for a plate with plane surfaces.