Master Student Electrical Engineering - Signal Processing

Re: Impulse response in OFDM system using IFFT

Reply posted 3 weeks ago (04/25/2021)
Hi @kaz, I believe the channel is UE sending to eNB and eNB is estimating the UL channel response based on pilot tones from UE.I am aware LTE uses 1200 subcarriers...

Re: Impulse response in OFDM system using IFFT

Reply posted 3 weeks ago (04/25/2021)
Hi @kaz, I will rephrase my task below.The measurement data is indeed from a 20 MHz LTE system with 1200 subcarriers. The measurements are the estimated channel...

Re: Impulse response in OFDM system using IFFT

Reply posted 3 weeks ago (04/25/2021)
Hi @MarkSitkowski , thanks for taking a look at my data. Your results indeed show me that my data should produce correct results. Do you have any information on...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/22/2021)
Yes exactly, that is the format of the CSV file.

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/22/2021)
Hi, it is real - imaginary data on linear scale. The dimension 10 is indeed for 10 different channel measurements in 1 file.regards, cel

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/21/2021)
Hi CharlieRader, thanks for the advice! By coincidence I switched to a plot with individual dots today, exactly because the phase response is hard to read otherwise.Can...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/21/2021)
Hi MarkSitkowski, thanks for your interest. I have prepared some npy and csv files for you at the following WeTranfer link.Included are raw complex channel measurements...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/20/2021)
Apologies for any confusion caused, I am indeed working in telecom on a typical 4G LTE system (it is a massive MIMO research testbed but I'm not yet working on MIMO...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/20/2021)
Hi David, thanks for the great answer!I have implemented the interpolation before doing the IFFT again (I had already done something similar before but it didn't...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/20/2021)
You're right indeed, I have updated my comment with a result using the complex oscillation. I had to update the formula to t/N to get a visible change in the phase...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/20/2021)
Hi, thanks for your answer josefsepp. I will try out this approach and report back. It actually sounds quite logical the factor t in the phase correction.Update:...

Re: Impulse response in OFDM system using IFFT

Reply posted 4 weeks ago (04/20/2021)
Hi, thanks for your answer!If I understand it correctly, I should only take first N/2 (with N=100 the ifft size) samples of my complex IFFT as the time domain impulse...

Impulse response in OFDM system using IFFT

New thread started 4 weeks ago
Hi all, for my masters thesis I have acquired some measurements of the channel frequency response for 100 pilot subcarriers in a 1024 subcarrier OFDM system. Now...

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