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Discrete Multitone (DMT) modulation is a multicarrier technique which makes efficient use of the channel, maximizing the htroughput by sending different numbers of bits on different subchannels. The number of bits on each subchannel depends in the Signal-to-Noise Ratio of the subchannel. The performance of a DMT system can be further increased by using powerful coding techniques. This thesis investigates an implementation of coding for a DMT system. The coding techniques considered are Ree-Solomon coding combined with interleaving, and Trellis Coded Modulation. Wei's 4-dimensional 16-state coder combined with trellis shaping is the suggested trellis code. A single encoder is used which codes across the tones of each DMT-symbol. At a bit error probability of 10 -7 the suggested codes gain 3-6 dB over uncoded transmission. Hardware complexity and algorithmic aspects of coding are covered, as well as simulations to verify it.

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I dagens IT-verksamheter är anskaffning av ny IT- plattform ett sätt att utveckla ett företag och dess affärsverksamhet. Plattformar kan köpas eller byggas av företaget själv. Om företaget bestämmer att köpa in ett standardsystem finns det ett enormt utbud av standardiserade plattformar att välja mellan. Dock ger många standardsystem inte önskat resultat för verksamheten eller förblir i vissa fall oanvända. Det är då av stor vikt att utföra ett kravarbete där man identifierar och beskriver en verksamhets behov på rätt sätt för att undvika inhandling av ett standardsystem som inte ger resultat. Genom att använda sig av kravmetoder får företag en sorts ramverk de kan jobba efter och det finns idag många olika kravmetoder såsom RUP (Rational Unified Process) eller ISO/IEC 25000 som kallas SQuaRE (System and Software Quality Requirements and Evaluation ). En av dessa kravmetoder är Stjärnan som är en svenskutvecklad metod att använda i Sverige. Stjärnan baseras ursprungligen på den internationellt erkända kravmetoden RUP. Stjärnan har tagit delar av RUP och skalat ner vissa delar för att skapa en kravmetod anpassad till svenska verksamheter. Stjärnan används generellt för att fånga in och strukturera kravarbeten i ett systemutvecklingsprojekt. Vi har utvärderat Stjärnan i en systemarkitektonisk kontext för att se hur välanpassad den är till IT-verksamheter . Vi har i vår kravprocess framställt en kravspecifikation, denna utgör en praktisk del av den utvärdering vi utför. I vår utvärdering har vi använt oss av en utvärderingsmodell vi valt att kalla Bass-modellen. Denna modell mäter hur väl en kravmetod uppfyller kriterier inom kravprocessen. Rapportens empiri är baserad på intervjuer och mailkorrespondens samt dokumentinsamling. Detta har genomförts för att besvara vår frågeställning “Täcker Stjärnan viktiga delar av kravhanteringsprocessen i en systemarkitektonisk kontext ?” Resultatet i vår rapport visar på att Stjärnan täcker viktiga delar av kravhanteringsprocessen i en systemarkitektonisk kontext . Detta resultat framkommer ur vår analys där vi genom en matris visar huruvida Stjärnan uppfyller de kriterier Bass-modellen efterfrågar / In today's IT operations, procurement of a new IT platform is a way of developing a business and its business. Platforms can be purchased or built by the company itself. If the company decides to buy a standard system, there’s a huge range of standardized platforms to choose from. However, many standard systems do not provide desired results for the business or remain unused in some cases.It is therefore important to carry out a task in which you correctly identify and describe an activity's needs to avoid the procurement of a standard system that does not produce results. By using methodologies, companies get a kind of framework they can work from and in this age there are many different requirements such as Rational Unified Process (RUP) or ISO / IEC 25000 called System and Software Quality Requirements and Evaluation (SQuaRE). One of these requirements is Stjärnan, which is a popular method of use in Sweden. Stjärnan is initially based on the internationally recognized method RUP. Stjärnan has taken parts of RUP and scaled it down to create a method adapted to Swedish operations. Stjärnan is generally used to capture and structure the work of crafts in a system development project. We have evaluated Stjärnan in a system architectural context to see how well adapted it is to Swedish operations. We have produced a requirement specification in our process, which is a practical part of the evaluation we carry out. In our evaluation we have used an evaluation model we chose to call the Bass model. This model measures how well a method meets criteria within the process. The empirical report is based on interviews and mail correspondence as well as document collection. This has been done to answer our question "Does Stjärnan cover key parts of the requirements management process in a system architectural context?" The result of our report shows that Stjärnan covers important parts of the requirement management process in a system architectural context. This result emerges from our analysis, where we show through a matrix whether the star meets the criteria the Bass model demands

The thesis tried to understand how renowned open data initiatives work, and give an attempt to investigate the relations between actors in an open data ecosystem. This was with ambitions to understand managerial approaches open data initiatives have adopted, to develop an understanding of actions and relations; where, how and whom initiatives support and facilitate. This is understandably of concern as not all open data initiatives reach a point where they have managed to bring about valuable impacts. The underlying assumption here is that it is difficult to visualise where and how open data can be beneficial, as such governmental open data initiatives remain stagnant with a limited understanding of strategies to adopt. The method of approach has been semi-structured interviews with international governmental open data officials. The findings suggest that open data management remarkably consist of approaches that are user-orientated and aim for governmental data management capacities. These two measures combined can instigate greater interaction between data users and publishers, which subsequently uncovers degrees of uncertainty and aids in building an open and digital system. Furthermore, the initiatives focus heavily on building awareness and consequently demonstrating value. It is crucial for open data initiatives to build momentum in activities through informing, teaching and engaging data users and publishers. Their end target is to demonstrate value for both sharing and using data. Certain risk is still inherent in opening up data, with that it is recommended to start small and safe - to build on small projects, observe outcomes, and then take directions. / open data initiative; ecosystem; complex; uncertainty; stagnant; change management; simple order-generating rule

Uppsatsen undersöker om blockkedjeteknik kan användas för att möjliggöra internetröstning i Sverige. Den redogör för de krav som ställs på ett sådant system, blockkedjeteknik i sig samt samlar kunskap om liknande system som redan finns implementerade i andra länder. Uppsatsen kommer fram till att blockkedjeteknik kan vara en möjliggörare i vissa avseenden, främst gällande lagring och räkning av valsedlar, men att det ensamt inte tillgodoser alla de krav som ställs på ett sådant system.

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A company that does not exist on the Internet will not survive and will lose its current customers.  The purpose of this study is to create a website for a foodstore that uses a community to support the food business to survive. There are a number of problems to be solved in terms of communication between the customers and the supermarket Årstaberg life. Using an agile manner, the work created a web portal to Årstaberg livs. Where previous studies and theories is a basis to show the way to a useful design suggestions of a web portal to support other activities.  Qualitative method was used to develop the requirements needed to make the web portal useful. There will be developed a specification, using the creation of a design proposals using a CMS tool. To ensure that the web portal will be made that two users tests to finally get a web portal.