lteResourceGrid

Subframe resource array

Syntax

grid = lteResourceGrid(cfg)

grid = lteResourceGrid(cfg,p)

Description

grid = lteResourceGrid(cfg) returns an empty resource array generated from the configuration settings structure, cfg. To create a resource array specifically for downlink or uplink, use lteDLResourceGrid or lteULResourceGrid, respectively.

For more information on the resource grid and the multidimensional array used to represent the resource elements for one subframe across all configured antenna ports, see Represent Resource Grids.

grid = lteResourceGrid(cfg,p) returns a resource array, where p directly specifies the number of antenna planes in the array.

Examples

Create Downlink Subframe Resource Array

Create an empty resource array that represents the downlink resource elements for 10MHz bandwidth, one subframe, and two antennas.

griddl = lteResourceGrid(struct('NDLRB',50,'CellRefP',2,'CyclicPrefix','Normal'));
size(griddl)

ans = 1×3

   600    14     2

Create Uplink Subframe Resource Array

Create an empty resource array that represents the uplink resource elements for 10MHz bandwidth, one subframe, and two antennas.

gridul = lteResourceGrid(struct('NULRB',50,'NTxAnts',2,'CyclicPrefixUL','Normal'));
size(gridul)

ans = 1×3

   600    14     2

Create Downlink Subframe Resource Array Using Optional Antenna Plane Input

Create an empty resource array that represents the downlink resource elements for 20 MHz bandwidth, one subframe, extended cyclic prefix, and four antennas planes.

cfg = struct('NDLRB',100,'CyclicPrefix','Extended');
p = 4;
griddl = lteResourceGrid(cfg,p);
size(griddl)

ans = 1×3

        1200          12           4

Input Arguments

cfg — Configuration settings

scalar structure

Configuration settings, specified as a scalar structure. To create a downlink resource array, cfg must contain the NDLRB and CellRefP fields. To create an uplink resource array, cfg must contain the NULRB field. The presence of field NDLRB takes precedence over the field NULRB.

For the downlink, these fields are applicable.

Parameter Field	Required or Optional	Values	Description
NDLRB	Required	Scalar integer from 6 to 110	Number of downlink resource blocks. ($$N_{\text{RB}}^{\text{DL}}$$)
CellRefP	Required	1, 2, 4	Number of cell-specific reference signal (CRS) antenna ports
CyclicPrefix	Optional	'Normal' (default), 'Extended'	Cyclic prefix length

For the uplink, these fields are applicable.

Parameter Field	Required or Optional	Values	Description
NULRB	Required	scalar integer from 6 to 110	Number of uplink resource blocks. ($$N_{\text{RB}}^{\text{UL}}$$)
CyclicPrefixUL	Optional	'Normal' (default), 'Extended'	Current cyclic prefix length
NTxAnts	Optional	1 (default), 2, 4	Number of transmission antennas.

p — Number of antenna planes in the output array

nonnegative scalar integer

Number of antenna planes in the output array, specified as a nonnegative scalar integer.

Data Types: double

Output Arguments

grid — Empty multidimensional resource grid

3-D numeric array

Empty multidimensional resource grid, returned as an N-by-M-by-P numeric array. N is the number of subcarriers (12×NULRB). M is the number of OFDM or SC-FDMA symbols in a subframe, 14 for normal cyclic prefix and 12 for extended cyclic prefix. P is the number of transmit antenna ports, cfg.CellRefP in the downlink and cfg.NTxAnts in the uplink.

Data Types: double