What is DC subcarrier in LTE?
DC stands for Direct Current and it is a subcarrier that has no information sent on it. The OFDM signal used in LTE comprises a maximum of 2048 different subcarriers with a spacing of 15 kHz. Resource blocks include 12 subcarriers, regardless of the total LTE signal bandwidth.
What is the subcarrier spacing in resource block?
A resource block (RB ) is the smallest unit of resources that can be allocated to a user. The resource block is 180 kHz. In frequency, resource blocks are either 12 x 15 kHz subcarriers or 24 x 7.5 kHz subcarriers wide The number of subcarriers used per resource block for most channels and signals is 12 subcarriers.
How does Carrier aggregation in LTE work?
Carrier Aggregation (CA) is a feature of LTE-Advanced that allows mobile operators & devices to combine two or more LTE carriers into a single data change. It leads to an increase in the capacity of the network and the data rates by exploiting fragmented spectrum allocations.
What is subcarrier spacing in 5G?
5G NR can choose subcarrier spacing from 15kHz to 240kHz, with a maximum 3300 subcarriers in simultaneous use on one channel. However, channels can be no more than 400MHz wide. The standard is frequency agnostic, meaning any subcarrier configuration can be used on any band.
What is subcarrier mapping?
Sub-carrier mapping is one of the major considerations for LTE as multiple mobile terminals i.e. users are assigned by partitioned subcarriers in OFDMA system. In LTE uplink a subsets of subcarriers are used to transmit its own data.
What does the DC subcarrier indicate?
3. What does the DC subcarrier indicate? Explanation: All the subcarriers of an OFDM symbol do not carry useful data. In OFDM and OFDMA PHY layers, the DC subcarrier is the subcarrier whose frequency is equal to the RF centre frequency of the transmitting station.
What is 4G aggregation?
LTE Advanced Carrier Aggregation, CA, is one of the key techniques used to enable the very high data rates of 4G to be achieved. By combining more than one carrier together, either in the same or different bands it is possible to increase the bandwidth available and in this way increase the capacity of the link.
How do I enable 4G carrier aggregation?
Through Status Bar & Settings To check for it, open Settings on your Android phone. Here, use the search bar at the top to look for “Carrier Aggregation” or “LTE Carrier Aggregation.” The option is usually present in Mobile Network Settings, System Settings, or Developer Options.
Which bandwidth is more efficient?
4. Which is more bandwidth efficient? Explanation: Time hopping spread spectrum is more bandwidth efficient.
What is the other name for a 3GPP2 based on 4G network?
Based on these requirements, three competing standards bodies worked on potential solutions for 4G. The 3GPP standards organization worked on a system called Long Term Evolution (LTE), 3GPP2 started developing its own solution called the Ultra Mobile Broadband (UMB), and IEEE started developing a system called WiMAX.