Multiple antenna transmitter and receiver architectures that combine antenna selection with RF pre-processing have been shown to significantly outperform conventional antenna selection with the same number of RF chains. Often, performance close to a full complexity architecture (with more RF chains) is also achieved. This work studies the effect of hardware and signal processing non-idealities on

The antenna scattering matrix is based on a spherical vector wave expansion and contains a complete description of the matching, transmission, receiving, and scattering properties of an antenna. It is commonly utilized in near-field measurements and it can also be used to model MIMO antennas. Here, an approach based on the holomorphic properties of the antenna scattering matrix is used to derive p

Companies spend a lot of attention and resources on something commonly referred to as ‘risk management’. Despite its apparent importance and intuitive appeal, corporate risk management is fraught with many difficulties, both on the conceptual and practical level. This may partly be explained by the fact that the role of risk management in increasing firm value is not very clear-cut. A contributing

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Review of Berg Eriksen, T., H. Harket och Einhart, L. Judehatets svarta bok: Antisemitismens historia från antiken till i dag. Stockholm: Bonniers, 2008

The current family of 802.11 protocols are based on the Carrier Sense Multiple Access (CSMA) mechanism which is a simple and robust means of sharing a channel. However, two current trends in wireless networks point towards a situation where CSMA fails to perform better than pure random access solutions such as ALOHA. The first trend is the ever increasing raw data rate in each generation of 802.11

The making of artefacts is a core activity in society, the result of which contributes to the building up of our physical surroundings and material culture. Throughout history, craft skills have been highly appreciated and have often been seen as crucial component of a capable human. Despite this, the knowledge base that constitutes the actual making is often overlooked in research. In this sessio

This paper presents the concepts of model-based course assessments. This involves a mathematical model to define the grading scheme of a course, based on a set of items to be scored. We report lessons learned from using this approach. An important conclusion is that model-based assessment promotes clear definitions of assessment criteria.