ltePDSCH

Physical downlink shared channel

Syntax

sym = ltePDSCH(enb,chs,cws)

Description

sym = ltePDSCH(enb,chs,cws) returns a matrix containing the physical downlink shared channel (PDSCH) complex symbols for cell-wide settings, enb, channel transmission configuration, chs, and the codeword or codewords contained in cws. The channel processing includes the stages of scrambling, symbol modulation, layer mapping, and precoding.

Examples

Generate PDSCH symbols for Test Model E-TM1.1 10MHz

Generate the configuration structure for Test Model E-TM1.1 10 MHz, as specified in TS36.141

Initialize the test model using lteTestModel. Generate information related to PDSCH indices and use info.Gd output to determine the required transport block. Execute lteDLSCH to create the codeword, then generate the PDSCH symbols.

tm = lteTestModel('1.1','10MHz');
tm.PDSCH.RNTI = 0;
tm.PDSCH.RV = 0;

prbset = (0:tm.NDLRB-1)';
[ind,info] = ltePDSCHIndices(tm,tm.PDSCH,prbset);

trBlk  = randi([0,1],info.Gd,1);
cw = lteDLSCH(tm,tm.PDSCH,info.G,trBlk);
pdschSym = ltePDSCH(tm,tm.PDSCH,cw);

Input Arguments

enb — eNodeB cell-wide settings

structure

eNodeB cell-wide settings, specified as a structure containing these parameter fields:

Parameter Field	Required or Optional	Values	Description
NCellID	Required	Integer from 0 to 503	Physical layer cell identity
NSubframe	Required	0 (default), nonnegative scalar integer	Subframe number
CellRefP	Required	1, 2, 4	Number of cell-specific reference signal (CRS) antenna ports
DuplexMode	Optional	'FDD' (default), 'TDD'	Duplexing mode, specified as either: 'FDD' for Frequency Division Duplex 'TDD' for Time Division Duplex
The following parameters are dependent upon the condition that DuplexMode is set to 'TDD'.
TDDConfig	Optional	0, 1 (default), 2, 3, 4, 5, 6	Uplink–downlink configuration
SSC	Optional	0 (default), 1, 2, 3, 4, 5, 6, 7, 8, 9	Special subframe configuration (SSC)
The following parameter fields are dependent upon the condition that chs.TxScheme is set to 'SpatialMux' or 'MultiUser'.
CFI	Required	1, 2, or 3 Scalar or if the CFI varies per subframe, a vector of length 10 (corresponding to a frame).	Control format indicator (CFI) value. In TDD mode, CFI varies per subframe for the RMCs ('R.0', 'R.5', 'R.6', 'R.6-27RB', 'R.12-9RB')
NDLRB	Required	Scalar integer from 6 to 110	Number of downlink resource blocks ($$N_{\text{RB}}^{\text{DL}}$$)
CyclicPrefix	Optional	'Normal' (default), 'Extended'	Cyclic prefix length

chs — Channel-specific transmission configuration

structure

Channel-specific transmission configuration, specified as a structure that can contain the following parameter fields.

Parameter Field	Required or Optional	Values	Description
Modulation	Required	'QPSK', '16QAM', '64QAM', '256QAM', '1024QAM'	Modulation type, specified as a character vector, cell array of character vectors, or string array. If blocks, each cell is associated with a transport block.
RNTI	Required	0 (default), scalar integer	Radio network temporary identifier (RNTI) value (16 bits)
TxScheme	Optional	'Port0' (default), 'TxDiversity', 'CDD', 'SpatialMux', 'MultiUser', 'Port5', 'Port7-8', 'Port8', 'Port7-14'.	PDSCH transmission scheme, specified as one of the following options. Transmission scheme Description 'Port0' Single antenna port, port 0 'TxDiversity' Transmit diversity 'CDD' Large delay cyclic delay diversity scheme 'SpatialMux' Closed loop spatial multiplexing 'MultiUser' Multi-user MIMO 'Port5' Single-antenna port, port 5 'Port7-8' Single-antenna port, port 7, when NLayers = 1. Dual layer transmission, ports 7 and 8, when NLayers = 2. 'Port8' Single-antenna port, port 8 'Port7-14' Up to eight layer transmission, ports 7–14
The following parameters are dependent upon the condition that TxScheme is set to 'CDD', 'SpatialMux', 'MultiUser', 'Port7-8'or 'Port7-14'.
NLayers	Required	Integer from 1 to 8	Number of transmission layers. The number of layers is dependent on TxScheme.
PMISet	Required	Integer vector with element values from 0 to 15.	Precoder matrix indication (PMI) set. It can contain either a single value, corresponding to single PMI mode, or multiple values, corresponding to multiple or subband PMI mode. The number of values depends on CellRefP, transmission layers and TxScheme. For more information about setting PMI parameters, see ltePMIInfo.
PRBSet	Required	Integer column vector or two-column matrix	Zero-based physical resource block (PRB) indices corresponding to the slot wise resource allocations for this PDSCH. PRBSet can be assigned as: a column vector, the resource allocation is the same in both slots of the subframe, a two-column matrix, this parameter specifies different PRBs for each slot in a subframe, a cell array of length 10 (corresponding to a frame, if the allocated physical resource blocks vary across subframes). PRBSet varies per subframe for the RMCs 'R.25'(TDD), 'R.26'(TDD), 'R.27'(TDD), 'R.43'(FDD), 'R.44', 'R.45', 'R.48', 'R.50', and 'R.51'.
The following parameters are dependent upon the condition that TxScheme is set to 'Port5', 'Port7-8', 'Port8', or 'Port7-14'.
W	Optional	Numeric matrix, [] (default)	NLayers-by-P precoding matrix for the wideband UE-specific beamforming of the PDSCH symbols. P is the number of transmit antennas. When W is not specified, no precoding is applied.

cws — Codeword or codewords

numeric vector | cell array

Codeword or codewords, specified as a vector of bit values for one codeword to be modulated, or a cell array containing one or two vectors of bit values corresponding to the one or two codewords to be modulated.

Output Arguments

sym — PDSCH symbols

complex numeric matrix

PDSCH symbols, returned as a complex numeric matrix. It has size N-by-P, where N is the number of modulation symbols for one antenna port and P is the number of transmission antennas. The complex symbols are generated using cell-wide settings, enb, channel transmission configuration, chs, and the codeword or codewords contained in cws.

Data Types: double
Complex Number Support: Yes

References

[1] 3GPP TS 36.101. “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) Radio Transmission and Reception.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

[2] 3GPP TS 36.141. “Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS) conformance testing.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

Version History

Introduced in R2014a