waveconfig = nrDLCarrierConfig();  % Create an instance of the waveform's parameter object
waveconfig.Label = 'DL carrier 1'; % Label for this downlink waveform configuration
waveconfig.NCellID = 0;            % Cell identity
waveconfig.ChannelBandwidth = 40;  % Channel bandwidth (MHz)
waveconfig.FrequencyRange = 'FR1'; % 'FR1' or 'FR2'
waveconfig.NumSubframes = 10;      % Number of 1ms subframes in generated waveform (1,2,4,8 slots per 1ms subframe, depending on SCS)
waveconfig.WindowingPercent = 0;   % Percentage of windowing relative to FFT length
waveconfig.SampleRate = [];        % Sample rate of the OFDM modulated waveform
waveconfig.CarrierFrequency = 0;   % Carrier frequency in Hz. This property is used for symbol phase
                                   % compensation before OFDM modulation, not for upconversion

% Define a set of SCS specific carriers, using the maximum sizes for a
% 40 MHz NR channel. See TS 38.101-1 for more information on defined
% bandwidths and guardband requirements
scscarriers = {nrSCSCarrierConfig(),nrSCSCarrierConfig()};
scscarriers{1}.SubcarrierSpacing = 15;
scscarriers{1}.NSizeGrid = 216;
scscarriers{1}.NStartGrid = 0;

scscarriers{2}.SubcarrierSpacing = 30;
scscarriers{2}.NSizeGrid = 106;
scscarriers{2}.NStartGrid = 1;

% SS burst configuration
ssburst = nrWavegenSSBurstConfig();
ssburst.Enable = 1;                     % Enable SS Burst
ssburst.Power = 0;                      % Power scaling in dB
ssburst.BlockPattern = 'Case B';        % Case B (30kHz) subcarrier spacing
ssburst.TransmittedBlocks = [1 1 1 1];  % Bitmap indicating blocks transmitted in a 5ms half-frame burst
ssburst.Period = 20;                    % SS burst set periodicity in ms (5, 10, 20, 40, 80, 160)
ssburst.NCRBSSB = [];                   % Frequency offset of SS burst (CRB), use [] for the waveform center

% Bandwidth parts configurations
bwp = {nrWavegenBWPConfig(),nrWavegenBWPConfig()};
bwp{1}.BandwidthPartID = 1;        % Bandwidth part ID
bwp{1}.Label = 'BWP @ 15 kHz';     % Label for this BWP
bwp{1}.SubcarrierSpacing = 15;     % BWP subcarrier spacing
bwp{1}.CyclicPrefix = 'Normal';    % BWP cyclic prefix for 15 kHz
bwp{1}.NSizeBWP = 25;              % Size of BWP in PRBs
bwp{1}.NStartBWP = 12;             % Position of BWP, relative to point A (i.e. CRB)

bwp{2}.BandwidthPartID = 2;        % Bandwidth part ID
bwp{2}.Label = 'BWP @ 30 kHz';     % Label for this BWP
bwp{2}.SubcarrierSpacing = 30;     % BWP subcarrier spacing
bwp{2}.CyclicPrefix = 'Normal';    % BWP cyclic prefix for 30 kHz
bwp{2}.NSizeBWP = 50;              % Size of BWP in PRBs
bwp{2}.NStartBWP = 51;             % Position of BWP, relative to point A (i.e. CRB)

% CORESET and search space configurations
coresets = {nrCORESETConfig()};
coresets{1}.CORESETID = 1;                      % CORESET ID
coresets{1}.Duration = 3;                       % CORESET symbol duration (1,2,3)
coresets{1}.FrequencyResources = [1 1 0 1];     % Bitmap indicating blocks of 6 PRB for CORESET (RRC - frequencyDomainResources)
coresets{1}.CCEREGMapping = 'noninterleaved';   % Mapping: 'interleaved' or 'noninterleaved'
coresets{1}.REGBundleSize = 3;                  % L (2,6) or (3,6)
coresets{1}.InterleaverSize = 2;                % R (2,3,6)
coresets{1}.ShiftIndex = waveconfig.NCellID;    % Set to NCellID

searchspaces = {nrSearchSpaceConfig()};
searchspaces{1}.SearchSpaceID = 1;              % Search space ID
searchspaces{1}.CORESETID = 1;                  % CORESET associated with this search space
searchspaces{1}.SearchSpaceType = 'ue';         % Search space type, 'ue' or 'common'
searchspaces{1}.SlotPeriodAndOffset = [5,0];    % Allocated slot period and slot offset of search space pattern
searchspaces{1}.Duration = 2;                   % Number of slots in the block of slots in pattern period
searchspaces{1}.StartSymbolWithinSlot = 0;      % First symbol of each CORESET monitoring opportunity in a slot
searchspaces{1}.NumCandidates = [8 8 4 2 0];    % Number of candidates at each AL (set to 0 if the AL doesn't fit in CORESET)

pdcch = {nrWavegenPDCCHConfig()};
pdcch{1}.Enable = 1 ;                  % Enable PDCCH sequence
pdcch{1}.Label = 'PDCCH @ 15 kHz';     % Label for this PDCCH sequence
pdcch{1}.BandwidthPartID = 1;          % Bandwidth part of PDCCH transmission
pdcch{1}.Power = 1.1;                  % Power scaling in dB
pdcch{1}.Coding = 1;                   % Enable DCI coding
pdcch{1}.SearchSpaceID = 1;            % Search space
pdcch{1}.SlotAllocation = 0;           % Allocated slots indices for PDCCH sequence
pdcch{1}.Period = 5;                   % Allocation period in slots
pdcch{1}.AggregationLevel = 8;         % Aggregation level (1,2,4,8,16 CCEs)
pdcch{1}.AllocatedCandidate = 1;       % PDCCH candidate in search space (1 based)
pdcch{1}.RNTI = 0;                     % RNTI
pdcch{1}.DMRSScramblingID = 1;         % PDCCH and DM-RS scrambling NID
pdcch{1}.DMRSPower = 0;                % Additional DM-RS power boosting in dB
pdcch{1}.DataBlockSize = 20;           % DCI payload size
pdcch{1}.DataSource = 'PN9';           % DCI data source

pdsch = {nrWavegenPDSCHConfig()};
pdsch{1}.Enable = 1;                    % Enable PDSCH sequence
pdsch{1}.Label = 'PDSCH @ 15 kHz';      % Label for this PDSCH sequence
pdsch{1}.BandwidthPartID = 1;           % Bandwidth part of PDSCH transmission
pdsch{1}.Power  = 0;                    % Power scaling in dB
pdsch{1}.Coding = 1;                    % Enable the DL-SCH transport channel coding
pdsch{1}.DataSource = 'PN9';            % Channel data source
pdsch{1}.TargetCodeRate = 0.4785;       % Code rate used to calculate transport block sizes
pdsch{1}.XOverhead = 0;                 % Rate matching overhead
pdsch{1}.Modulation = 'QPSK';           % 'QPSK', '16QAM', '64QAM', '256QAM'
pdsch{1}.NumLayers = 2;                 % Number of PDSCH layers
pdsch{1}.RVSequence = [0,2,3,1];        % RV sequence to be applied cyclically across the PDSCH allocation sequence
pdsch{1}.VRBToPRBInterleaving = 0;      % Disable interleaved resource mapping
pdsch{1}.VRBBundleSize = 2;             % vrb-ToPRB-Interleaver parameter

pdsch{1}.SymbolAllocation = [2,9];    % First symbol and length
pdsch{1}.SlotAllocation = 0:9;        % Allocated slot indices for PDSCH sequence
pdsch{1}.Period = 15;                 % Allocation period in slots
pdsch{1}.PRBSet = [0:5, 10:20];       % PRB allocation
pdsch{1}.RNTI = 0;                    % RNTI
pdsch{1}.NID = 1;                     % Scrambling for data part

pdsch{1}.ReservedCORESET = 1;           % Rate matching pattern, defined by CORESET IDs
pdsch{1}.ReservedPRB{1}.PRBSet = [];    % Rate matching pattern, defined by set of PRB (RRC 'bitmaps')
pdsch{1}.ReservedPRB{1}.SymbolSet = [];
pdsch{1}.ReservedPRB{1}.Period = [];

% Antenna port and DM-RS configuration (TS 38.211 section 7.4.1.1)
pdsch{1}.MappingType = 'A';                % PDSCH mapping type ('A'(slot-wise),'B'(non slot-wise))
pdsch{1}.DMRSPower = 0;                    % Additional power boosting in dB

pdsch{1}.DMRS.DMRSConfigurationType = 2;   % DM-RS configuration type (1,2)
pdsch{1}.DMRS.NumCDMGroupsWithoutData = 1; % Number of DM-RS CDM groups without data. The value can be one of the set {1,2,3}
pdsch{1}.DMRS.DMRSPortSet = [];            % DM-RS antenna ports used ([] gives port numbers 0:NumLayers-1)
pdsch{1}.DMRS.DMRSTypeAPosition = 2;       % Mapping type A only. First DM-RS symbol position (2,3)
pdsch{1}.DMRS.DMRSLength = 1;              % Number of front-loaded DM-RS symbols (1(single symbol),2(double symbol))
pdsch{1}.DMRS.DMRSAdditionalPosition = 0;  % Additional DM-RS symbol positions (max range 0...3)
pdsch{1}.DMRS.NIDNSCID = 1;                % Scrambling identity (0...65535)
pdsch{1}.DMRS.NSCID = 0;                   % Scrambling initialization (0,1)

% PT-RS configuration (TS 38.211 section 7.4.1.2)
pdsch{1}.EnablePTRS = 0;             % Enable or disable the PT-RS (1 or 0)
pdsch{1}.PTRSPower = 0;              % Additional PT-RS power boosting in dB

pdsch{1}.PTRS.TimeDensity = 1;       % Time density (L_PT-RS) of PT-RS (1,2,4)
pdsch{1}.PTRS.FrequencyDensity = 2;  % Frequency density (K_PT-RS) of PT-RS (2,4)
pdsch{1}.PTRS.REOffset = '00';       % PT-RS resource element offset ('00','01','10','11')
pdsch{1}.PTRS.PTRSPortSet = 0;       % PT-RS antenna ports must be a subset of DM-RS ports

pdsch{2} = pdsch{1};
pdsch{2}.Enable = 1;
pdsch{2}.Label = 'PDSCH @ 30 kHz';
pdsch{2}.BandwidthPartID = 2;          % PDSCH mapped to 2nd BWP
pdsch{2}.SymbolAllocation = [0,12];
pdsch{2}.SlotAllocation = [2:4,6:20];
pdsch{2}.PRBSet  = [25:30, 35:38];     % PRB allocation, relative to BWP

csirs = {nrWavegenCSIRSConfig()};
csirs{1}.Enable = 0;
csirs{1}.Label = 'CSI-RS @ 15 kHz';
csirs{1}.BandwidthPartID = 1;
csirs{1}.Power = 3; % Power scaling in dB

csirs{1}.CSIRSType = {'nzp','zp'};
csirs{1}.RowNumber = [3 5];
csirs{1}.Density = {'one','one'};
csirs{1}.SubcarrierLocations = {6,4};
csirs{1}.NumRB = 25;
csirs{1}.RBOffset = 12;
csirs{1}.SymbolLocations = {13,9};
csirs{1}.CSIRSPeriod = {[5 0],[5 0]};
csirs{1}.NID = 5;

csirs{2} = nrWavegenCSIRSConfig();
csirs{2}.Enable = 0;
csirs{2}.Label = 'CSI-RS @ 30 kHz';
csirs{2}.BandwidthPartID = 2;
csirs{2}.Power = 3; % Power scaling in dB
csirs{2}.CSIRSType = {'nzp','nzp'};
csirs{2}.RowNumber = [1 1];
csirs{2}.Density = {'three','three'};
csirs{2}.SubcarrierLocations = {0,0};
csirs{2}.NumRB = 50;
csirs{2}.RBOffset = 50;
csirs{2}.SymbolLocations = {6,10};
csirs{2}.CSIRSPeriod = {[10,1],[10,1]};
csirs{2}.NID = 0;

waveconfig.SSBurst = ssburst;
waveconfig.SCSCarriers = scscarriers;
waveconfig.BandwidthParts = bwp;
waveconfig.CORESET = coresets;
waveconfig.SearchSpaces = searchspaces;
waveconfig.PDCCH = pdcch;
waveconfig.PDSCH = pdsch;
waveconfig.CSIRS = csirs;

% Generate complex baseband waveform
[waveform,info] = nrWaveformGenerator(waveconfig);

figure;
plot(abs(waveform));
title('Magnitude of 5G Downlink Baseband Waveform');
xlabel('Sample Index');
ylabel('Magnitude');

samplerate = info.ResourceGrids(1).Info.SampleRate;
nfft = info.ResourceGrids(1).Info.Nfft;
figure;
spectrogram(waveform(:,1),ones(nfft,1),0,nfft,'centered',samplerate,'yaxis','MinThreshold',-130);
title('Spectrogram of 5G Downlink Baseband Waveform');

disp('Modulation information associated with BWP 1:')
disp(info.ResourceGrids(1).Info)