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POLQA (ITU P863) [2 articles]

I downloaded the P.863 POLQA source code from the ITU website. As far as I can see there is no guide to how the project should be built. So I created a new console application (empty project) in Vis...

Very Nice Error Control (and general comms) Presentation

Hey Guys, I just stumbled across this from a friend who was a member of the TAPR and it looks really fgreat (even though it was written in 1995) in that it presents information at the crossroads ...

The harder the work the less it's paid? [18 articles]

First, by harder I mean more knowledge required. Having cleared that up it seems to me that the harder the work the less it's paid. For instance firmware developers which spend years writing cod...

Cryptography: serial-link validation [18 articles]

I'm not even sure of the correct term to use. I want to build some security into a product that uses a pair of controllers communicating by RS-232. I'd like the "slave" controller to require t...

Gibbs sampling jump/step size

I'm trying to perform Gibbs sampling. I've written the algorithm but I'm not sure how to calculate the jump/step size so that successful iterations would be independent (Gibbs is MCMC). I have ...

FIR as variable upsampler [5 articles]

I have to design a single FIR filter to upsample input by either 16, 8, 4, 2 according to selection. I tried 384 taps (h = fir1(383, .01) but soon ended up with some conflict of mind. In all case...

Polyphase Filter [5 articles]

Hi , I am designing a polyphase filter in HW, which will do a sample rate upconversion by a factor of 1.25 on the incoming data.It is implemented as a upsampling by 5 followed by a decimation(pol...

does FFTW break when subjected to multiple simultaneous requests? [9 articles]

Anyone know if multiple simultaneous requests to (the same instance of) FFTW are made, will FFTW either: (1) simply serialize these requests (e.g. perform one right after the other), thereby comple...

Fine frequency offset estimation [3 articles]

Hi, I am working on a QPSK receiver (20 Mbps) for short packet reception and based on a preamble. In a first step I use a CW preamble for timing and coarse frequency acquisition, and with a differ...

Estimating signals with irrational spectra [4 articles]

OK. This is sort of off the wall, and I know that the best practical answer is probably "approximate it with a lumped-paremeter system and use a Kalman filter". But: Assume that you have a si...