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In this paper a flexible FFT processor for OFDM systems is presented. In future wireless systems using OFDM each terminal should be able to handle a wide range of different applications, from pure voice communication to high-speed data transfers, with as little overhead in power consumption and protocol procedure as possible. As the terminals will be battery powered and should be cheap to manufact
Popular Abstract in Swedish Växthuseffekten och klimatförändringar har de senaste decennierna påskyndat forskning och utveckling av alternativa energikällor, däribland bränslecellen. En första skiss på en bränslecell föddes redan på 1830-talet. Det dröjde dock till 1950-talet innan den första kommersiella bränslecellen användes i ett av NASAs projekt. I Sverige har forskning runt bränsleceller medProton-exchange membrane fuel cells (PEMFC)s are increasingly regarded as promising environmentally benign power sources. Intensive development is today directed towards reducing the cost and increasing the durability of the fuel cell, as well as expanding the operational window for the PEMFC for a range of applications. The proton-conducting membrane is one of the key components in the PEMFC. The
Inget statligt ingrepp har någonsin haft en så negativ inverkan på den fackliga organisationsgraden i Sverige som den förändring av a-kassornas finansiering som den borgerliga alliansregeringen genomförde från årsskiftet 2006/2007. Under loppet av två år sjönk andelen fackligt anslutna löntagare med sex procentenheter: från 77 procent 2006 till 71 procent 2008. Den 1 januari 2007 höjdes avgifterna
The purpose of this paper is to reflect on how potential circumventing media and communication technologies could potentially assist the information flow when authoritarian regimes decide to block the main channels, such as the Internet and the mobile phone networks. The point of departure is the recent Internet blackouts in countries in the Middle East and North Africa (MENA), such as Egypt, Bahr
Popular Abstract in Swedish Förpackningar finns nästan överallt! Ta en titt nästa gång du äter frukost – redan där på morgonen möter och hanterar du ett flertal olika livsmedelsförpackningar. De finns där även om du kanske inte tänker så mycket på dem, mer än när de är svåröppnade, svåra att hälla ur eller när de rent av läcker. Förpackningar har som jag ser det tre funktioner: de ska kunna skyddaPrevious research has argued that packaging has a great potential to contribute to sustainable development, but how to put this potential into practice is not yet fully explored. The theoretical foundation of the research presented is at the intersection of packaging logistics and sustainable development. This foundation was chosen because it offers established models that are well linked to the h
This work describes a novel fully integrated inductive tongue computer interface for disabled people. The interface consists of an oral unit placed in the mouth, including inductive sensors, related electronics, a system for wireless transmission and a rechargeable battery. The system is activated using an activation unit placed on the tongue, and incorporates 18 inductive sensors, arranged in bot
This study tries to find out if increased contact leads to increased trust between individuals and communities that earlier were enemies. The theoretical baseline for the study is the contact theory. According to the contact theory the more contact, under the right circumstances, the less trouble. Empirical research supports the theory on the individual level. However, when it comes to an aggregat
