consecutive subcarriers in the frequency domain. This corresponds
to one slot in the time domain and 180 kHz in the frequency domain. The
number of OFDMA symbols in a slot ()
depends on the cyclic prefix as shown in the table below.Signal Studio for LTE/LTE-Advanced FDD currently supports only FDD with frame structure type 1 and the 15 kHz subcarrier spacing.
Figure 1 illustrates a downlink resource block made up of resource elements. Each resource element corresponds to an OFDM symbol. An index pair (k,l) defines a resource element, where k represents the resource element position in the frequency domain and l represents the resource element position in the time domain.
A downlink resource block is defined as consecutive OFDMA symbols in the time
domain, and consecutive subcarriers in the frequency domain. This corresponds
to one slot in the time domain and 180 kHz in the frequency domain. The
number of OFDMA symbols in a slot ()
depends on the cyclic prefix as shown in the table below.
|
CP |
Subcarrier spacing |
|
(frame structure type 1) |
(frame structure type 2) |
|---|---|---|---|---|
|
Normal cyclic prefix |
15 kHz |
12 |
7 |
9 |
|
Extended cyclic prefix |
15 kHz |
12 |
6 |
8 |
|
Extended cyclic prefix |
7.5 kHz |
24 |
3 |
4 |
In multi-antenna transmission, there is a unique resource block for each antenna port.
Refer to the 3GPPTS 36.211 document for more information about resource blocks.
Figure 1. Downlink Resource Block
