How many subcarriers in LTE?
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….Terminology.
| Time Unit | Value |
|---|---|
| Symbol | (0.5 ms) / 7 for normal CP (0.5 ms) / 6 for extended CP |
| Ts | 1/(15000 * 2048) sec » 32.6 ns |
What is a resource element in LTE?
A Resource Element is one 15 kHz subcarrier by one symbol. Resource Elements aggregate into Resource Blocks. A Resource Block has dimensions of subcarriers by symbols. Twelve consecutive subcarriers in the frequency domain and six or seven symbols in the time domain form each Resource Block.
What is the subcarrier spacing in LTE?
15 kHz apart
In LTE, each subcarrier is spaced 15 kHz apart. These subcarriers are combined in groups of 12 to form a single resource block. Each resource block is used in an OFDMA arrangement to send data to different handsets or combined for high-speed data.
How many RBs is 20MHz?
100 RBs
In case of 20Mhz with 100 RBs, then the maximum bit rate will be double of that which i calculated, that is 100.8Mb/s, For 50 Mbls one has to assign x blocks= (50/100.8)x total no. of resource blocks(100)= one has to assign 50 resource blocks, and in case of 60 Mbls the number of assigned RBs= (60/100.8) 100=60.
Which modulation is used in 4G?
LTE uses the popular orthogonal frequency division multiplex (OFDM) modulation scheme. It provides the essential spectral efficiency to achieve high data rates but also permits multiple users to share a common channel.
What modulation does 5G use?
Orthogonal Frequency Division Multiplexing (OFDM) is an efficient modulation format used in modern wireless communication systems including 5G.
What is Reg and CCE in LTE?
Resource Element Group (REG) : a group of 4 consecutive resource elements. ( resource elements for reference signal is not included in REG) Control Channel Element (CCE) : a group of 9 consective REG. Aggregation Level : a group of ‘L’ CCEs. ( L can be 1,2,4,8)
Which modulation is used in 5G?
Does LTE support 256 QAM?
“In both wireless and wireline communications, there is 16-QAM, 64-QAM, and 256-QAM, which all pertain to LTE, as well as even higher QAM schemes, such as 1024-QAM, which are now being considered for the future evolution of LTE/LTE-Advanced Pro and 5G.”
Does 5G support 1024 QAM?
3GPP Rel-15 (5G) supports 1024 QAM (from 256 QAM, which was introduced in LTE Rel-12), allowing 5G to achieve higher peak data rates and spectral efficiency in favorable scenarios.
How does LTE calculate PRB?
Physical Resource Block (PRB) = 2*Resource Block = 12 Subcarriers x 14 OFDM in 1ms.
What is CCE index?
CCE Index is the CCE number at which the control channel data (PDCCH) is allocated. Normally this index changes for each subframe, meaning that even the same PDCCH data (e.g, a PDCCH for the same UE) allocated in each subframe changes subframe by subframe.
How is CCE calculated?
(60 x 60 x 200) Indicates number of CCEs in 1 hour. Wonderful explaination I must say @sadanandk2 ! For 3rd DL ( SF=3, which carry ACK/NACK), available no of CCE for CFI = 3 = ( 3600 – 400 – 12 – 156) / 36 = 84 CCE.
What is the modulation index of a signal?
The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level. It is defined differently in each modulation scheme. Amplitude modulation index. Frequency modulation index. Phase modulation index.
What is the modulation index of 2fsk?
The general formula for the modulation index is the following: where H is the modulation index, M is the modulation alphabet size (e.g. M=2 for 2FSK / 2GFSK). For 2FSK / 2GFSK modulation the symbol rate is equal to the data rate, and unlike 4FSK / 4GFSK modulation there is only one deviation.
What is percentage of modulation in FM?
This is known as percentage of modulation. Let us understand modulation index in FM (Frequency Modulation). In FM, modulation index is the ratio of frequency deviation (Fd) to the modulating frequency (Fm).
How to calculate modulation index in Cro?
Modulation index can be calculated by knowing modulating voltage and carrier voltage. But it is very common to measure the modulation index from the modulated waveform. The same can be viewed in the CRO (i.e. Oscilloscope).