I am PhD student.

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/12/2021)
Sorry for not being clear enough. By saying "filtering out" I meant to down-convert this signal and reject another signals (so if I want to demodulate let's say...

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/11/2021)
Dear Y(J)STo better understand my problem I have prepared an image which shows exemplary situation. There are few signals in the spectrum. My task is to filter out...

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/04/2021)
Interferences must be filtered out because in the end signal has to be demodulated. I said that signals might be narrowband but on the other hand signal might be...

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/04/2021)
yes, I want to run it in real time indeed, so implementation is also crucial. We have quiet powerful hardware but it is also easy to overload by too long FFTs. I...

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/04/2021)
Dear kaz,I get it now. First design a narrow-passband lowpass filter with sharp cutoff edge and then if pass-band is not wide enough, decimate filter coefficients...

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/04/2021)
Dear Y(J)S,Thanks for answer. Are you talking about fast convolution algorithm?Zeroing don't wanted bins sounds good, but I am not loosing some information during...

Re: Band-variable signals filtration - best approach

Reply posted 3 months ago (02/04/2021)
Dear kaz,Could you explain that little bit more? What do you mean by saying "reference filter"?
Dear forum Members,I have to design a filtration in wide 650 MHz band. Detection algorithm finds signals in this band and provides information like: start and stop...
Dear forum Members,I am looking for IQ samples data which represents signals for different communication systems i.e. WiFi, LTE, 3G, DVB-T, FM radio etc. Anyone...

Re: Spectrum monitoring - signal detection problem

Reply posted 4 months ago (01/07/2021)
Yes, 500 MHz is my focus span and this is already in baseband but I still have a feeling that we don't understand each other. ADC has antialiasing filters so its...

Re: Spectrum monitoring - signal detection problem

Reply posted 4 months ago (01/07/2021)
What do you mean by saying: "filtered from either side" ?Discard anything above random noise? Sorry but I dont get it. The point is that, I should take into account...

Re: Spectrum monitoring - signal detection problem

Reply posted 4 months ago (01/07/2021)
Dear Platybel,If it comes to details, input samples will be complex and present 500 MHz bandwidth. Task is to find transmissions in whole 500 MHz spectrum. I would...

Re: Spectrum monitoring - signal detection problem

Reply posted 4 months ago (01/07/2021)
Dear kaz,Thank you for your answer. So you are suggesting that first step is to calculate power in 500 MHz band and if detected power is greater than some threshold...

Spectrum monitoring - signal detection problem

New thread started 4 months ago
Dear friends,I got a task where I have to monitor wide range of frequency spectrum (500 MHz). If any transmission happens in that band, I need to extract as much as...

Re: How to synthesize band-limited noise?

Reply posted 5 months ago (11/30/2020)
Hello Mr Lyons!Yeah thats true, I feel honored cause so many living legends wrote under my question, including you! Thank you all, problem was resolved using IFFT...

Re: How to synthesize band-limited noise?

Reply posted 5 months ago (11/30/2020)
Dear CharlieRader,First of all, thank you for your answer. Replying to your questions:- its going to be definite length of samples,- its not have to be fast cause...

Re: How to synthesize band-limited noise?

Reply posted 5 months ago (11/27/2020)
...

Re: How to synthesize band-limited noise?

Reply posted 5 months ago (11/27/2020)
Thanks!What do you think about using FFT? By zeroing bins for each subcarries and put random complex numbers in place where noise has to occur? I have an access...

Re: How to synthesize band-limited noise?

Reply posted 5 months ago (11/27/2020)
Yeah! Thats was my idea also! I know that in Octave or Matlab there are plenty of usefull functions but as I mentioned, I need to write it in C/C++. Question is,...

How to synthesize band-limited noise?

New thread started 5 months ago
Hello everyone,My goal is to generate band-limited noise. Simply: user defines BW and my task is to generate time domain complex samples to imitate defined band...

Re: PhD in E.E. is it really worth it

Reply posted 1 year ago (05/09/2020)
Thank you very much for your answer. It really gave me better view of my current situation. Its really helpful to get good advises and guidance in your life by simple...

Re: PhD in E.E. is it really worth it

Reply posted 1 year ago (05/09/2020)
Hi Jeff,Thank you for your answer. To be honest I thought about ML. During my free time I enjoy to develop myself into that field. I think I have strong background...

Re: PhD in E.E. is it really worth it

Reply posted 1 year ago (05/09/2020)
Sorry, maybe I didn't make myself clear enough. By saying "being an engineer than scientist" I thought about my duties which are invloving mainly coding, simulating...

PhD in E.E. is it really worth it

New thread started 1 year ago
Hi everyone,Maybe this is not an ordinary question but I would like to ask all of you, who has many years of experience as professionals engineers, and who knows...

Re: New quiz question by Rick Lyons

Reply posted 1 year ago (04/24/2020)
Mr Rick LyonsI've never thought that I'll speak to you even through online forum. I have no words to say how your book was, and still is, helpful for me during my...

Re: New quiz question by Rick Lyons

Reply posted 1 year ago (04/24/2020)
Idk if its only me but there is only one question, right?
Hi,With dual channel mode you have max BW = fs. After proper signal filtration you can capture band from 5,4 to 8,1 GHz or from 8,1 GHz to 10,8. With single channel...
Hi,I can see that difference is negligible. Keep in mind that interp function unlike upsampling/downsampling provides averaging (lowpass filtration) which possibly...

Re: Design a preamble structure for OFDM

Reply posted 1 year ago (04/09/2020)
Dear Milruwan,Large plateau? I don't think so, it gives you ten peaks if it comes to STS. You just have to correlate a priori known sequence of STS with received...

Re: Design a preamble structure for OFDM

Reply posted 1 year ago (04/08/2020)
Dear Milruwan,Yes you are right its coarse estimation but thats how its done in 802.11a. There is a threshold value for STS correlation peaks. Sharpness depends...

Re: Design a preamble structure for OFDM

Reply posted 1 year ago (04/08/2020)
Hi,Originally CFO is estimated using well known Schmidl&Cox algorithm based on STS. LTS is used for channel estimation and equalization. Best reference is MATLAB...

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