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Results tagged with communication-standard
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user 26081
2
votes
5G uplink switching from CP OFDM to DFT-s-OFDM
The term is transform precoding. Whether it is enabled is configured semi-statically by RRC messages, which are usually broadcasted (periodically) in System information (SI) messages.
If the system in …
- 6,725
6
votes
How to determine the FFT size of LTE downlink receiver?
You don't need to sample at cell FFT rate. Just shifted the received signal to the desired subcarrier and take a lowpass filtering, then sample at user-specific bandwidth (see attached image). The shi …
- 6,725
8
votes
Accepted
System Frame Number in LTE Specifications
System Frame Number (SFN) is essentially a counter. As its name suggests, it indicates the index of a system frame modulo 1024, with the index ranging from 0 to 1023 (10 bits).
SFN does not aid in phy …
- 6,725
4
votes
Accepted
What is the difference between Antenna port and Physical Antenna in LTE?
This answer is for LTE standard, not 5G NR. However I do believe that the basic concept does not change since.
(Logical) Antenna port is defined formally as in 3GPP 36.211
An antenna port is defi …
- 6,725
7
votes
Accepted
Capacity of cascade binary symmetric channels
A binary symmetric channel (BSC) can be characterized by its complemented probability $p$. Its well-known capacity is
$$C = 1 - H(p) = 1 - (-p\log(p) - (1-p)\log(1-p))$$
where $H(p)$ is binary entro …
- 6,725