Questions tagged [lte]
The lte tag has no usage guidance.
0
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2answers
28 views
Frequency Domain Correction of Frequency Offset or Doppler Frequency in LTE
We are working on LTE Uplink CFO Correction for 3 MHz band. The time domain CFO correction is easy, which depends on the processing of 3840 samples step by step multiply by $\exp(-j 2\pi f_\text{...
0
votes
0answers
21 views
Is there a software/application that shows the FM base stations nearby us?
I want to collect a list of FM base stations near me. I have found apps/software for finding LTE base station but found no success in finding an app for FM base station.
0
votes
1answer
16 views
How multi layer map to different beams in LTE Beamforming
I understand for SU-MIMO Beamforming single layer maps to all antennas with phase shift applied to create beam. Also I understand in this case all beams will be carrying same signal (say s1).
But in ...
0
votes
0answers
10 views
Calculating the Channel state information for localization
I want to build a localization system using 4G LTE for a project. Intuitively, I can get the position measuring the time a signal leaves the Base Station to the User Equipment. Knowing that these ...
1
vote
1answer
37 views
Quantized error in scatter plots for a hamming windowed LTE signal
I have a time domain signal based on LTE standards.
Carrier spacing = 15KHz, Symbols per slot = 6, extended Cyclic Prefix = 512 samples
FFT size = 2048, No. of sub carriers = 1200, channel BW = 20MHz, ...
0
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0answers
60 views
How to do carrier aggregation?
I have generated 20 MHz bandwidth LTE waveform. I wanted to do carrier aggregation of this signal to get 100 MHz Signal.
I want to understand how carrier aggregation is done mathematically, so using ...
1
vote
1answer
152 views
am I recording LTE uplink signals?
I have this app in my phone which tells me the LTE UL frequency and power:
so I went with my SDR and measured the received signal at that frequency:
Now, how can I be sure this is the transmitted ...
1
vote
1answer
1k views
What is the difference between Antenna port and Physical Antenna in LTE?
I have just started working on the 5G NR physical layer and I have difficulty understanding the concept of Antenna Port at the downlink.
In release 10 there supposedly 15-22 antenna ports for CSIRS (...
-1
votes
2answers
97 views
What is the transmission frequency of mimo antennas?
I was wondering what is the operating frequency of different antenna's in a MIMO system? Do they work in the same band or separate band that the LTE(22 bands) assigned with?
Thank you.
2
votes
2answers
814 views
Why is LTE either FDD or TDD?
In LTE systems, up- and downlink are duplexed either using FDD or TDD. Why has this not been designed to utilize the same multiplexing technique as used for the downlink (OFDMA)? Resource blocks could ...
1
vote
1answer
217 views
SC-FDMA in LTE system
I am trying to understand how SC-FDMA is used in LTE system. Every description I found so far refers to DFT and IDFT.
However, when I checked 3GPP TS 36.211 chapter 5.4 (SC-FDMA baseband signal ...
0
votes
1answer
68 views
Why OFDM is more appropriate with MIMO than other multiple access method?
As read from MIMO-OFDM wikipidia page says
Research conducted during the mid-1990s showed that while MIMO can be used with other popular air interfaces such as time-division multiple access (TDMA) ...
4
votes
1answer
3k views
The necessity of null subcarrier in OFDM?
In looking to LTE specifications, with the subcarrier spacing $\Delta f = 15 \textrm{kHz}$,
for bandwidth $10 \textrm{MHz}$, fft size $N_{fft} = 1024$ that needs a sampling rate $F_s \geq 1024 \times ...
2
votes
2answers
2k views
System Frame Number in LTE Specifications
What exactly is System Frame Number in LTE specifications? What is the use of it?
I have read that it is a 10 bit number and used for synchronization purposes. But it's not clear how it helps for ...
1
vote
1answer
680 views
SC-FDMA disadvantages
I understand the advantages of SC-FDMA over OFDM and I also understand the disadvantage of additional complexity (FFT block), are there another disadvantages?
Also, if $N$ has to be bigger than $M$ ($...
0
votes
0answers
847 views
Difference between single layer and dual layer beamforming in LTE
I'm trying to understand the difference between single and dual layer beamforming in LTE as described in TS 36.101 section B.4.1 and B.4.2 respectively. Also refer to TS 36.211 section 6.3.4.2.3 for ...
1
vote
0answers
119 views
How often do a LTE eNodeB scheduler schedule?
Scheduler schedules the resource for each UE. How often do a LTE eNodeB scheduler schedule? Is the time between each scheduling fixed?
any idea/reference will be great help on this regard. Thanks.
