LTE defines transmission bandwidths from 1.25 MHz up to 20 MHz. In the case of 1.25 MHz transmission bandwidth, the FFT size is 128. In other words, 128 samples are taken within the FFT period of 66.67 μsec.
Why are there 12 subcarriers in LTE?
In the downlink, the subcarriers are split into resource blocks. This enables the system to be able to compartmentalise the data across standard numbers of subcarriers. Resource blocks comprise 12 subcarriers, regardless of the overall LTE signal bandwidth. They also cover one slot in the time frame.
What is the sampling rate in LTE?
|Sampling frequency [MHz]||30.72||122.88|
|Subcarrier spacing [kHz]||15||120|
How is LTE sampling rate calculated?
Base Sampling Rate is based on System Bandwidth (BW) and is set as follows: System BW = 1.4 MHz, Base Sampling Rate = 1.92 MHz. System BW = 3 MHz, Base Sampling Rate = 3.84 MHz. System BW = 5 MHz, Base Sampling Rate = 7.68 MHz. System BW = 10 MHz, Base Sampling Rate = 15.36 MHz.
What is FFT size?
The FFT size defines the number of bins used for dividing the window into equal strips, or bins. Hence, a bin is a spectrum sample , and defines the frequency resolution of the window.
What is a 5G PRB?
Physical Resource Block. A E-UTRA PRB (Physical Resource Block) is defined as consisting of 12 consecutive subcarriers for one slot (0.5 ms). A PRB is the smallest element of resource allocation assigned by the eNB scheduler.
How is LTE transmitted?
The LTE network is based on Internet Protocol (IP) standards, the kind that delivers Web pages to your computer, and adds voice data to the transmission streams [source: 4G Americas]. It uses a schematic called OFDMA, or Orthogonal Frequency Division Multiple Access, which is similar to the OFDM approach in WiMAX.