# Reserach

*If you are having any problems with accessing any of my papers, let me know and I will help you.*

### Journal papers

- E. Ringh, and E. Jarlebring,
*Nonlinearizing two-parameter eigenvalue problems*, SIAM J. Matrix Anal. Appl., 42:2 (2021), 775-799. (Open acces)

Code for the problem: E. Jarlebring's homepage. - T. Breiten and E. Ringh,
*Residual-based iterations for the generalized Lyapunov equation*, BIT, 59:4 (2019), pages 823-852. (Open acces)

Code for the problem: Here. - E. Jarlebring, G. Mele, D. Palitta, and E. Ringh,
*Krylov methods for low-rank commuting generalized Sylvester equations*, Numer. Linear Algebra Appl., 25 (2018), pages e2176.

Code for the problem: Here, and at D. Palitta's homepage. - E. Ringh, G. Mele, J. Karlsson, and E. Jarlebring,
*Sylvester-based preconditioning for the waveguide eigenvalue problem*, Linear Algebra Appl., 542 (2018), pages 441-463.

Code for the problem: Here.

### Conference papers

- A. Gattami, E. Ringh, and J. Karlsson,
*Time Localization and Capacity of Faster-Than-Nyquist Signaling*, IEEE Global Communications Conference (GLOBECOM), San Diego, California, USA Dec. 2015. - M. Larsson, J. Lindberg, J. Lycke, K. Hansson, A. Khakulov, E. Ringh, F. Svensson, I. Tjernberg, A. Alam, J. Araujo, F. Farokhi, E. Gadhimi, A. Teixeira, D. V. Dimarogonas and K. H. Johansson,
*Toward an Indoor Testbed for Mobile Networked Control Systems*, Proceedings of the First Workshop on Research, Development and Education on Unmanned Aerial Systems (RED-UAS), Seville, Spain 2011.

### Books

- G. Mele, E. Ringh, D. Ek, F. Izzo, P. Upadhyaya, E. Jarlebirng,
*Preconditioning for linear systems*, Kindle direct publishing, 2020. (free pdf, or purchase book)

### Technical reports

- E. Jarlebring, M. Fasi, E. Ringh,
*Computational graphs for matrix functions*, arXiv, (2021), 2107.12198.

Here is the documentation, and the code is on Github as matrixfunctions/GraphMatFun.jl. - E. Jarlebring, M. Bennedich, G. Mele, E. Ringh, and P. Upadhyaya,
*NEP-PACK: A Julia package for nonlinear eigenproblems - v0.2*, arXiv, (2018), 1811.09592.

Here is the documentation, and the code is on Github as nep-pack/NonlinearEigenproblems.jl. - A. Gattami, E. Ringh, and J. Karlsson,
*Time Localization and Capacity of Faster-Than-Nyquist Signaling*, arXiv, (2015), 1505.03309.

### Software

- Core developer of GraphMatFun.jl, a software package in Julia for representation, manipulation and optimization of algorithms for matrix functions. For more info see the documentation, and/or the pre-print.
- Core developer of NEP-PACK, a software package for nonlinear eigenvalue problems in Julia. For more info see the documentation for NEP-PACK, and/or the pre-print.

### Patents

- S. Parkvall, et al.,
*Network architecture, methods, and devices for a wireless communications network*, US patents: 10 367 677 , 10 630 410 , 10 638 253 , and 10 938 497. - E. Ringh and A. Gattami,
*Processing of a faster-than-Nyquist signaling reception signal*, US patent: 10 237 096 - M. Hashemi, J. Li, E. Ringh, and H. Sahlin,
*Cell search procedure frame format*, US patents: 10 034 253 and 10 356 737 - A. Gattami and E. Ringh,
*Pre-coding in a faster-than-Nyquist transmission system*, US patent: 9 838 230

### Theses

- E. Ringh,
*Numerical methods for Sylvester-type matrix equations and nonlinear eigenvalue problems*(PhD thesis, 2021) (complete pdf, errata) - E. Ringh,
*Low complexity algorithms for faster-than-Nyquist signaling*(Master thesis, 2013) - E. Ringh and M. Larsson,
*Movement Detection and Tracking using Wireless Camera Networks*(Bachelor thesis, 2011).