Matlab Toolbox : 5G Library : PDSCH/DMRS

Last updated on Nov 30, 2023

Physical Downlink Shared Channel (PDSCH):

The PDSCH is a key component in the downlink transmission of 5G New Radio (NR) systems. It is responsible for delivering user data and control information to the User Equipment (UE). The modulation and coding scheme (MCS) determine the data rate and reliability of the PDSCH.

In MATLAB's 5G Toolbox, you can create and configure PDSCH using the nrPDSCH function. This function allows you to set various parameters, such as the numerology, modulation scheme, resource grid, and more.

Here's a simplified example of how you might create a PDSCH in MATLAB:

matlabCopy code% Define PDSCH parameters
pdsch = nrPDSCH;
pdsch.NCellID = 0;
pdsch.RNTI = 1;
pdsch.Modulation = 'QPSK';
pdsch.SymbolAllocation = [0 6];
pdsch.PRBSet = (0:49).';

% Generate PDSCH symbols
data = randi([0, 1], pdsch.PRBSetSize * length(pdsch.SymbolAllocation), 1);
pdschSymbols = nrPDSCH(pdsch, data);

Demodulation Reference Signal (DMRS):

DMRS is a reference signal used by the UE for channel estimation and demodulation of the received PDSCH. It helps the UE to accurately demodulate the received signal, compensating for channel impairments. The DMRS is a known signal that is inserted in predefined positions in the resource grid.

In MATLAB's 5G Toolbox, you can configure DMRS using the nrDMRS function. Similar to PDSCH, you can set various parameters like the cell identity, RNTI, DMRS configuration, and more.

Here's a simplified example of how you might create DMRS in MATLAB:

matlabCopy code% Define DMRS parameters
dmrs = nrDMRS;
dmrs.NCellID = 0;
dmrs.RNTI = 1;
dmrs.DMRSConfigurationType = 1;
dmrs.PRBSet = (0:49).';

% Generate DMRS symbols
dmrsSymbols = nrDMRS(dmrs);

These examples provide a basic overview of how you can configure and generate PDSCH and DMRS in MATLAB's 5G Toolbox. Depending on your specific use case and requirements, you may need to adjust the parameters accordingly.

Keep in mind that MATLAB's 5G Toolbox is a powerful tool for simulating and analyzing 5G systems, providing functions for various aspects of 5G communication, including waveform generation, channel modeling, and performance evaluation.