## Forums comp.dsp

## Frequency offset compensation for 802.15.4 (ZigBee-MSK)

inHi all, I am working on implementation of zigbee device on FPGA. Till now I have made Tx which is compatible with commercial devices. Also I...

Hi all, I am working on implementation of zigbee device on FPGA. Till now I have made Tx which is compatible with commercial devices. Also I have Rx which is working with my own Tx, but does not work with commercial devices. Major reason why my receiver can not decode signals from commercial devices is frequency offset. So far I tried to apply zero crossing approach to decode signal, but that d...

## FIR filter verification

inHello All, My area of expertise is verification of functions and have theoretical exposure to DSP. To get started with some practical...

Hello All, My area of expertise is verification of functions and have theoretical exposure to DSP. To get started with some practical exercises, I have started working on a simple filter. Basically, I have designed a moving average filter with co-efficient - 0.2 0.2 0.2 0.2 0.2 I have used two stimulus' currently to do a sanity check if the implementation is working. Firstly, I have p...

## OT: Global warming

in...

http://www.news.com.au/national/western-australia/miranda-devine-perth-electrical-engineers-disc overy-will-change-climate-change-debate/story-fnii5thn-1227555674611 A MATHEMATICAL discovery by Perth-based electrical engineer Dr David Evans may change everything about the climate debate, on the eve of the UN climate change conference in Paris next month. A former climate modeller for the

## OT: I'm ticked off at DSP guru fred harris

inHi Guys, DSP guru fred harris has published journal and conference papers with a lady co-author named Elettra Venosa. This ticks me off!...

Hi Guys, DSP guru fred harris has published journal and conference papers with a lady co-author named Elettra Venosa. This ticks me off! Fred's co-authors look like Ms. Venosa and my co-authors look like Eric Jacobsen, Randy Yates, and Grant Griffin? http://www.eeweb.com/bio/elettra_venosa Like just ain't fair. [-Rick-]

## How to simplify a rolling average in an FPGA

inI am trying to replicate some C code in an FPGA and am getting wrapped around the axle of the rolling average that is being used. I am sure there...

I am trying to replicate some C code in an FPGA and am getting wrapped around the axle of the rolling average that is being used. I am sure there is a simple way to do what is being done in C (or at least close), but I seem to keep going in mental circles trying to converge onto it. The C code is pretty simple: rolling_average = rolling_average*((rolling_average_num-1)/rolling_average_num) ...

## IQ Data from ADC

inCan I somehow obtain IQ Data by using two ADCs on same input real signal and are there some limitations to this? I see Texas Instrument ADCs...

Can I somehow obtain IQ Data by using two ADCs on same input real signal and are there some limitations to this? I see Texas Instrument ADCs have two channels named I and Q but I do not understand if I have two inputs (for two analog signals representing I and Q) or they form I and Q from real signal. Thank you very much in advance. --------------------------------------- Posted through http...

## Fast method to compute large Covariance Matrix on FPGA?

Hi, i have a serious problem with the architecture of a correlator for a planar antenna array (16 x 16). Theoretically i can't implent the...

Hi, i have a serious problem with the architecture of a correlator for a planar antenna array (16 x 16). Theoretically i can't implent the normal expression sum(X*X^H) because i would obtain a covariance matrix of 256 x 256. Then i can think to implement the spatial smoothing technique, namely it takes an average of overlapped subarray, with the advantage to have a smaller covariance matrix....

## Quantization Error

inI wonder, How could the quantization (by truncation) error, E, for negative fractional numbers represented using ones complement is bounded...

I wonder, How could the quantization (by truncation) error, E, for negative fractional numbers represented using ones complement is bounded by 0

## Loss of low frequency response on a windowed HRTF

inWhy is there low frequency response attenuation on HRTFs (or impulse responses) that are windowed to a shorter length. One explanation I've...

Why is there low frequency response attenuation on HRTFs (or impulse responses) that are windowed to a shorter length. One explanation I've heard is that because the measurements are AC- coupled having less bins on the FFT "smooths" the frequency response. I would like to be able to calculate this attenuation for a window of any size. Any clues on how to do this? I haven't found any literatu...

## How to detect pulses superimposed on a slow varying signals

inHi, I have to detect pulses depicted in the following picture: http://postimg.org/image/ud1usxcwr/ They are pulses superimposed on a...

Hi, I have to detect pulses depicted in the following picture: http://postimg.org/image/ud1usxcwr/ They are pulses superimposed on a slow varying signal. Any ideas? Thanks, Enrico Migliore --------------------------------------- Posted through http://www.DSPRelated.com