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Markus Nentwig's DSP Blog
Markus received his Dipl. Ing. degree in electrical engineering / communications in 1999. Work interests include RF transceiver system design, implementation and modeling. He works as senior architect for Renesas Mobile Europe in Finland.
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Delay estimation by FFT
Summary: The delay between a signal and a reference appears in the frequency domain as linear phase shift. It can be estimated with subsample accuracy using FFT methods.This article provides a ...
posted by Markus Nentwig on Sep 22 2007 under Matlab | Basics | Tips and Tricks Comments (20) |
A brief look at multipath radio channels
Summary: Discussion of multipath propagation and fading in radio links Radio channels, their effects on communications links and how to model them are a popular topic on comp.dsp. Unfortunately, for m...
posted by Markus Nentwig on Oct 31 2007 under Basics | Tips and Tricks Comments (7) |
A multiuser waterfilling algorithm
Hello,this blog entry documents a code snippet for a multi-user waterfilling algorithm. It's heuristic and relatively straightforward, making it easy to implement additional constraints or rules.I rew...
posted by Markus Nentwig on Nov 5 2010 under Wireless | Communication Comments (0) |
Least-squares magic bullets? The Moore-Penrose Pseudoinverse
Hello, the topic of this brief article is a tool that can be applied to a variety of problems: The Moore-Penrose Pseudoinverse.While maybe not exactly a magic bullet, it gives us least-squares optima...
posted by Markus Nentwig on Oct 24 2010 under Matlab | Basics | Tips and Tricks Comments (5) |
Design study: 1:64 interpolating pulse shaping FIR
This article is the documentation to a code snippet that originated from a discussion on comp.dsp. The task is to design a root-raised cosine filter with a rolloff of a=0.15 that interpolates to 64x...
posted by Markus Nentwig on Dec 26 2011 under Matlab | Basics | Multirate DSP Comments (4) |
Polyphase filter / Farrows interpolation
Hello, this article is meant to give a quick overview over polyphase filtering and Farrows interpolation. A good reference with more depth is for example Fred Harris' paper: http://www.signumconce...
posted by Markus Nentwig on Sep 18 2007 under Basics Comments (11) |
Through the tube...
Hello all,something completely different... there was some recent discussion on the forum about modeling guitar amplifiers.I have been wondering for quite a while, whether the methods that I use to mo...
posted by Markus Nentwig on Sep 15 2007 under Audio DSP Comments (2) |
Understanding Radio Frequency Distortion
Overview The topic of this article are the effects of radio frequency distortions on a baseband signal, and how to model them at baseband. Typical applications are use as a simulation model or i...
posted by Markus Nentwig on Sep 26 2010 under Basics | Wireless | Communication Comments (0) |
Radio Frequency Distortion Part II: A power spectrum model
Summary This article presents a ready-to-use model for nonlinear distortion caused by radio frequenfcy components in wireless receivers and linear transmitters. Compared to the similar model pre...
posted by Markus Nentwig on Oct 11 2010 under Matlab | Wireless | Communication Comments (1) |
Bank-switched Farrow resampler
Bank-switched Farrow resampler Summary A modification of the Farrow structure with reduced computational complexity.Compared to a conventional design, the impulse response is broken into a higher nu...
posted by Markus Nentwig on Aug 13 2011 under Matlab | Basics | Multirate DSP Comments (0) |