ltePRS

Positioning reference signal

Syntax

sym = ltePRS(enb)

Description

sym = ltePRS(enb) returns a column vector containing the positioning reference signal (PRS) symbols for transmission in a single subframe on antenna port 6. These symbols are ordered as they should be mapped into the resource elements along with ltePRSIndices. As determined by the PRS subframe configuration and duplex mode, the output vector is empty if no PRS is scheduled in the subframe.

The optional PRSPeriod parameter controls the downlink subframes in which PRS is present. See the ltePRSIndices function reference page for details.

Examples

Generate Positioning Reference Signal Symbols

Generate the PRS symbols for subframe 0 of a 10MHz downlink.

Create a cell-wide configuration structure initialized for RMC R.2. Configure for full band PRS (NPRSRB = NDLRB). Configure Iprs = 0, which sets [Tprs Dprs] = [160 0].

rmc = lteRMCDL('R.2');
rmc.NPRSRB = rmc.NDLRB;
rmc.PRSPeriod = 0;
prsSymbols = ltePRS(rmc);

Generate PRS symbols.

prsSymbols(1:4)

ans = 4×1 complex

   0.7071 + 0.7071i
   0.7071 + 0.7071i
   0.7071 + 0.7071i
   0.7071 + 0.7071i

Input Arguments

enb — Cell-wide settings

structure

Cell-wide settings, specified as a structure. enb contains the following parameter fields.

The parameters TDDConfig and SSC are only required if DuplexMode is set to 'TDD'.

NDLRB — Number of downlink resource blocks

positive scalar integer (6,...,110)

Number of downlink resource blocks, specified as a positive scalar integer from 6 through 110.

Example: 45

Data Types: double

CellRefP — Number of cell-specific reference signal antenna ports

1 | 2 | 4

Number of cell-specific reference signal antenna ports, specified as a 1, 2, or 4.

Example: 1

Data Types: double

NCellID — Physical layer cell identity number

nonnegative scalar integer

Physical layer cell identity number, specified as a nonnegative scalar integer.

Example: 4

Data Types: double

NSubframe — Subframe number

nonnegative scalar integer

Subframe number, specified as nonnegative scalar integer.

Example: 5

Data Types: double

NFrame — Frame number

0 (default) | optional | nonnegative scalar integer

Frame number, specified as nonnegative scalar integer.

Example: 6

Data Types: double

CyclicPrefix — Cyclic prefix length

'Normal' (default) | optional | 'Extended'

Cyclic prefix length, specified as a 'Normal' or 'Extended'.

Data Types: char | string

DuplexMode — Duplex mode type

'FDD' (default) | optional | 'TDD'

Duplex mode type, specified as 'FDD' or 'TDD'. Used for separating the transmission signals.

Data Types: char | string

TDDConfig — Uplink or downlink configuration for TDD

0 (default) | optional | nonnegative scalar integer (0,...,6)

Uplink or downlink configuration for TDD, specified as a nonnegative scalar integer from 0 through 6. Required only for 'TDD' duplex mode.

Example: 4

Data Types: double

SSC — Special subframe configuration

0 (default) | optional | nonnegative scalar integer (0,...,9)

Special subframe configuration, specified as nonnegative scalar integer from 0 through 9. Required only for 'TDD' duplex mode.

Example: 6

Data Types: double

NPRSRB — Number of PRS physical resource blocks

0,...,NDLRB

Number of PRS physical resource blocks, specified as nonnegative scalar integer from 0 through NDLRB.

Example: 8

Data Types: double

PRSPeriod — Positioning reference signal (PRS) period

'On' (default) | optional | 'Off' | [Iprs] | [Tprs Dprs]

Positioning reference signal (PRS) period, specified as 'On', 'Off', a numeric scalar, or a 1-by-2 vector. This parameter controls the downlink subframes in which PRS will be present. For details, see ltePRSIndices.

Example: 0

Example: [160 0]

Data Types: char | string | double

Output Arguments

sym — Positioning Reference Signal (PRS) symbols

complex numeric column vector

Positioning Reference Signal (PRS) symbols, returned as complex numeric column vector, for transmission in a single subframe on antenna port 6.

Example: 0.7071 + 0.7071i

Data Types: double
Complex Number Support: Yes

Version History

Introduced in R2014a