MATLAB: Modify number of antennas in NR PDSCH Throughput

5G5g toolboxdownlinkpdschthroughput

I want to modify the number of antennas to perform the NR PDSCH Throughput simulation. But it is wrong to change only the value of

simParameters.NTxAnts = 8;
simParameters.NumCW = 2;
simParameters.PDSCH.TargetCodeRate = [490 490]./1024;
simParameters.PDSCH.Modulation = {'16QAM','16QAM'};
simParameters.NRxAnts = 8;

https://es.mathworks.com/help/5g/examples/nr-pdsch-throughput.html

Best Answer

Hi Javier,

The one most important aspect is to change is the number of layers. The number of layers decide whether the number of codewords is set to 1 or 2. Though you made your simulation setup to NumCW as 2, if the NumLayers field is less than 4, it doesnt affect.

When the number of layers is greater than 4, there will be two codewords. When the number of layers is less than or equal to 1, there will be single codeword.

So the update required is;

simParameters.PDSCH.NLayers = 5;  % Any value greater than 4 and less than or equal to 8, to perform two codewords simulation

Hope this helps.

Regards,

Sriram

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MATLAB: 5G NR Downlink Carrier Waveform Generation

Hi Javier,

You can provide any values. But the best guide to run different simulations is the Transmission bandwidth configurations provided in the standard spec of TS 38.104 Section 5.3.2.

For example to configure a value of Channel Bandwidth of 30 MHz of 15 kHz SCS and 50 MHz bandwidth of 60 kHz SCS, make the following updates to carrier structure and bwp structure:

% Carriers Configuration
carriers = [];
carriers(1).SubcarrierSpacing = 15; % 15 kHz
carriers(1).NRB = 160;  % 160 resource blocks comprise 30 MHz bandwidth
carriers(1).RBStart = 0;
carriers(2).SubcarrierSpacing = 60; % 60 kHz
carriers(2).NRB = 65;    % 65 resource blocks comprise to 50 MHz bandwidth
carriers(2).RBStart = 0;
% Bandwidth parts configuration (Occupying complete carrier for both numerologies)
bwp = [];
bwp(1).SubcarrierSpacing = carriers(1).SubcarrierSpacing;          % BWP Subcarrier Spacing same as carrier subcarrier spacing 1
bwp(1).CyclicPrefix = 'Normal';         % BWP Cyclic prefix for 15 kHz
bwp(1).NRB = carriers(1).NRB;                        % Size of BWP

bwp(1).RBOffset = 0;                   % Position of BWP in SCS carrier

bwp(2).SubcarrierSpacing = carriers(2).SubcarrierSpacing;          % BWP Subcarrier Spacing
bwp(2).CyclicPrefix = 'Normal';         % BWP Cyclic prefix for 60 kHz
bwp(2).NRB = carriers(2).NRB;                        % Size of BWP
bwp(2).RBOffset = 0;                   % Position of BWP in SCS carrier

This will generate the output waveform for both the numerologies.

Hope this helps.

Regards,

Sriram

MATLAB: 5G carrier aggregation parameters

Take a look at 5G NR spec documents, TS 38.101-x.

Graham

Best Answer

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MATLAB: 5G NR Downlink Carrier Waveform Generation

MATLAB: 5G carrier aggregation parameters

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