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I'm somewhat confused by your question.
For clarity, I'm going to go over some basics which you probably already know in an attempt to find your gap in understanding.
You must first define the OFDM symbol in the frequency domain on N tones or 'subcarriers'. After the N-point IDFT, in...
Re: OFDM with ICI Frequency Equalization
Can you be more specific about your equalization algorithm? Are your operations in the frequency or time domain? What are your dimensions for H and X? What is your model for ICI?
Unlike ISI (which is cyclic in the time domain thanks to the cyclic...
Re: OFDM with ICI Frequency Equalization
Hi David,
Interesting topic. Can you provide some more details?
Are you equalizing each subcarrier independently? If so, I'm surprised that equalization mitigates ICI.
Perhaps the equalization is only removing the ISI (intersymbol interference)...
Just a minor point, but OFDM signals don't HAVE to be pulse-shaped. By adding null guard subcarriers on the edge of the spectrum (as in all OFDM standards), you are effectively bandlimiting the signal.
Now, you may want to add a pulse-shaping filter to improve the transition regions on the...
For an overview of fading channels (with math), see Sklar's tutorial: http://faraday.ee.emu.edu.tr/ee569/art_sklar5_fading.pdf
Intuitively, it's pretty straightforward. ISI is the result of many copies of the transmitted signal arriving on top of each other at the receiver, each from different...
Just to be clear, the effective bandwidth is 5 MHz, but the spectrum width before the edge transition is around 4.5 MHz = (301 non-edge subcarriers) * (15 kHz subcarrier width).
I think your confusion is very common.
The sampling theorem tells you that you need a sampling rate at least 2x the...
Re: sampling frequency in LTE&OFDM downlink.
The sampling frequency is the minimum baseband digital symbol rate of data at the transmitter (before DAC and RF upconversion). Bandwidth here is not a precise number. Remember that all time-limited signals have infinite bandwidth. Here...
What exactly do you want to do with the pilots?
Also, what exactly do you mean by pilots in LTE?
For example, in the LTE downlink there are different types of training signals which could be thought of as `pilots'.
- cell-specific reference signals added to specific distributed subcarriers...
I have found that polar coordinates interpolation works better, in general. This is fine for MATLAB simulations, but in practice, it will be more complexity since you'll have to use the CORDIC algorithm for fixed-point, real-time implementation.
I usually don't use simulink, so I don't know the exact block you're using, but I'm assuming the second branch is the parity bits of the interleaved branch. I suggest looking at this: https://www.mathworks.com/help/comm/ref/turboencoder.html
I think it is correct that, unless there are device technology breakthroughs, we won't see any order of magnitude improvements in PHY capabilities...at least from theoretical research. Increasing the data rate right now seems to be about increasing the availability of physical spectrum. Hence...
Wow. They took it down today...I just checked the PDF before I included the link.
Here is the dissertation which contains the same work (postscript): **broken link removed**
That depends, what do you consider 5G? Be wary of marketing. There is no standard for 5G yet. Most people have not even experienced 4G. LTE does not meet ITU 4G requirements.
3G - WiMax, HSPA, EV-DO
3.5G - HSPA+, Wimax revision, LTE
4G - LTE Advanced
I'm assuming Samsung's recent press...
I can't give you this analysis without more information, but it seems like you could easily make your point through symbol/bit error calculations. Sorry I can't help more, but my definition of a (non)regenerative repeater and your definition are slightly different. Does your non-regenerative...
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