Together with my colleague Jens I recently stumbled across a widely linear estimation problem. More precisely, we were trying to estimate a vector $\ma{x} \in \compl^{N}$ such that $\ma{C} \cdot \begin{bmatrix}\ma{x}\\ \ma{x}^*\end{bmatrix}$ was as close as possible to a given $\ma{b} \in \compl^{M}$ for a given matrix $\ma{C} \in \compl^{M \times 2N}$. This is not […]

# Author Archives: admin

## A funny series

One of the reasons I posted a funny number was to tell you the story of a funny series I discovered by chance. It had to do with my fascination for simple constructs like $j^j$ giving unexpected results like ${\rm e}^{-\pi/2}$. I always wondered: are there more numbers connected to powers of $j$ or numbers […]

## A funny number

I was giving tutorials for an undergraduate course in Signals and Systems theory. Since students came from quite varying backgrounds I had to start very simple – my first tutorial used to be just on complex numbers. This left some of the students bored, saying they’ve seen it all. To keep them thinking I usually […]

## Finally

Finally, I managed to update the site a bit and to put my dissertation online. You can now find it on the main site unter “Dissertation”, here is a link for you. I’d be very happy to hear your feedback. I hope you will enjoy reading it.

## Long time no post…

… I apologize. But I have a good excuse: I was really really busy trying to finish my thesis. That’s right folks, this guy has submitted his dissertation recently and the last weeks towards this goal were quite … intense. I’m not entirely happy with the result but that’s normal I think, noone ever is. […]