Questions tagged [communication-standard]
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0answers
60 views
No. of Cyclic prefix for 5G NR signal with 100Mhz bandwidth different subcarrier spacing?
I want to generate a 100Mhz bandwidth 5G NR signal with different subcarrier spacing(15,30,60,120Khz) in matlab. What is the no. of CP to be added for 1st OFDM symbol and the other symbols and also ...
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3answers
104 views
Quality of experience engineer
I have noticed certain overlap between digital signal processing and quality assurance for jobs that require expertise in evaluating the quality of the transmitted signals on telecommunication systems ...
1
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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 (...
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0answers
66 views
Zigbee 2.4GHz vs Sub-GHz
I have a working ZigBee 2.4GHz GnuRadio + HackRF combination - sniffs spectrum, dumps packets. I would like to now sniff a sub GHz channels - 863+ and such.
Is my understanding correct that the only ...
0
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1answer
224 views
File size adjustment using FFT
I have been given the task of doing audio compression using FFT.
The assignment is below.
Below is my MATLAB code:
...
2
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2answers
2k views
Capacity of cascade binary symmetric channels
Let's imagine that we have interconnected in cascade $L$ binary symmetric channels each with the same transition probability $p(y|x) \in \{p, q=1-p\}$, where the output of each BSC is connected to the ...
3
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0answers
42 views
Actual measurements of the influence of fading and multipath on HF radio communication
I'm looking for papers or books that contain actual measurements of the influence one has to expect in HF radio communication. I'm interested in this, because i've simulated the influence of a ...
2
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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 ...
0
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2answers
524 views
Difference between diversity gain and coding gain
I am reading about space-time codes. They break down further into 2 sub categories called space-time trellis codes and space-time block codes. It says that trellis codes offer both diversity and ...
2
votes
1answer
169 views
P2 symbol constellation in DVB-T2
DVB-T2, 32K SISO, not extended.
I've acquired P2 symbol, PRBS bits have matched with bits recovered from pilots. Then equalization was applied to all subcarriers. The constellation I've got looks ...
1
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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.
0
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1answer
417 views
Transport Block calculation in LTE Downlink
I would like to understand the relation between the TB size calculation in the TS36.213 document and in the simulator (https://www.nt.tuwien.ac.at/research/mobile-communications/vienna-lte-a-...
3
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3answers
1k views
How to determine the FFT size of LTE downlink reciever?
I'm puzzled about the LTE FFT size.
Assuming an LTE base station works at 20M mode, the FFT size is 2048. Then, many users can be served by this base station.
Do all these users work at 20M mode (...
-3
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1answer
1k views
Why 1536 FFT size for 15 MHz in LTE
Why we use 1536 point FFT for 15 MHz bandwidth, when we can use 1024 point FFT, as in bandwidth of 15 MHz we have only 900 subcarriers.
