I am PhD student.

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 1 week 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 1 week 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 1 week 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 1 week 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...
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 2 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 2 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 2 months ago (11/27/2020)
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Re: How to synthesize band-limited noise?

Reply posted 2 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 2 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 2 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 8 months 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 8 months 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 8 months 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 8 months 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 9 months 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 9 months 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 9 months 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 9 months 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 9 months 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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