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A new frequency offset tracking approach for OFDM has been addressed. Two-dimensional pilot-symbol assisted modulation (2D-PSAM) is employed in coherent OFDM for channel estimation and it is based on inserting known symbols spread out through the 2D time-frequency grid. We show that these scattered symbols can also be employed to perform frequency synchronization. Maximum likelihood estimation has

In the Bologna process, the use of explicit learning goals and formative assessment are central elements in improving student learning. Ideally, formative assessment provides feedback to the student about how his present state relates to the learning goals and enables him to reflect on and regulate his learning. However, we found that it was easier said than done – not just to carry out, but in pa

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I kapitlet diskuteras hur sorg över att mista ett barn uttrycks och kommuniceras i olika tider. Texten tar sin utgångspunkt i en samling fotografier från 1900-talets början föreställande döda spädbarn. Dessa, som hör till en särskild genre - dödsbäddsporträtt - och idag återfinns i många arkiv, sätts i relation till minnessidor på Internet över barn som avlidit i samband med förlossningen. Sorg oc

Popular Abstract in Swedish KLINISK, GENETISK OCH METABOLISK KARAKTERISERING AV LADA (LATENT AUTOIMMUNE DIABETES IN ADULTS) Diabetes mellitus, sockersjuka, har blivit en allt vanligare sjukdom över hela världen. Det finns totalt drygt 100 miljoner diabetiker idag och antalet förväntas åtminstone fördubblas till år 2010. Viktiga skäl till denna nästan epidemiska utveckling är livsstilsförändringar Latent autoimmune diabetes in adults (LADA) comprises about 10% of patients initially diagnosed with type 2 diabetes but who are positive for pancreatic islet antibodies, especially to glutamic acid decarboxylase (GADabs). The present studies focused on clinical, genetic and metabolic characterisation of patients with LADA. In LADA, the frequency of the type 1 diabetes susceptibility genotype HLA-

A number of researchers have attempted to define and encapsulate the essence of ‘critical research’. It has been suggested to encompass interpretation of social phenomena, and seeks for understandings that could support efforts to bring about beneficial change. It has been further suggested that such work is characterised by: concern with substantive social issues (e.g. power, values); foundation

Popular Abstract in Swedish För många cancerpatienter är strålbehandling ett viktigt behandlingsalternativ. En framgångsrik behandling kräver att den absorberade dosen till patienten kan ges med stor noggrannhet. Detta eftersom en liten avvikelse i absorberad dos kan påverka behandlingens resultat. Strålbehandling sker idag med avancerad teknik och utrustning där osäkerheterna i varje led i behandThis thesis presents a new verification concept, the virtual accelerator, for dose calculation algorithms used in treatment planning systems (TPSs) for external beam radiotherapy. The algorithm input data required to implement a treatment unit in the TPS are generated by Monte Carlo simulations as are the beam reference data needed for the subsequent evaluation of the dose calculation algorithm. T

A growing body of research suggests that a firm’s governance system can significantly impact the long-term value creative potential of an enterprise by disciplining and encouraging organizational efforts to pursue risky entrepreneurial projects. Following this stream of research, we present a study of the impact of ownership and board governance on entrepreneurship in small technology-based firms.