Dear Sir,
When I am trying to test running multilink scenario by using different waveform for each Base station I got simulation error in some cases.
The cases I tried as the following:
case 1: BS1 use OFDM and BS2 use fOFDM The simulation worked successfully
case 2: BS1 use OFDM and BS2 use WOLA The simulation worked successfully
case 3: BS1 use OFDM and BS2 use FBMC
I got this error.
Error using Parameters.SimulationParameters/checkParameters (line 654)
Invalid ratio of subcarrier spacing, number of subcarriers and number of total
symbols across cells.
Error in Parameters.SimulationParameters (line 30)
obj.checkParameters();
Error in main (line 23)
simParams = Parameters.SimulationParameters(simulationScenario);
case 4: BS1 use OFDM and BS2 use UFMC
I got this error.
The sampling rate was set to 15.120000 MHz.
Sampling rate does not match the predefined delays of the channel model!
Delay taps are changed according to (top = desired value; bottom = chosen value):
1.0e-06 *
0 0.1100 0.1900 0.4100
0 0.1323 0.1984 0.3968
------- Started -------
Warning: The temporary variable ‘signalLength’ will be cleared at the beginning of
each iteration of the parfor-loop. If ‘signalLength’ is used before it is set, a
runtime error will occur. For more information, see Parallel for Loops in MATLAB,
“Uninitialized Temporaries”.
In main (line 48)
Starting parallel pool (parpool) using the ‘local’ profile …
Connected to the parallel pool (number of workers: 2).
Error using Parameters.SimulationParameters/initializeLinks (line 1471)
Index exceeds the number of array elements (1).
Error in main (line 48)
parfor iSweep = 1:length(simParams.simulation.sweepValue) % this may be ‘for’ or
‘parfor’
please help me to correct the problem.
this is my scenario
%% Topology
scStr.topology.nodes = [‘BS1,BS2,UE1,UE2’]; % Specify all nodes in the network
% Primary (desired) links
scStr.topology.primaryLinks = [‘UE1:BS1,’ … % two cells with single user each
‘UE2:BS2’];
% Links for Joint Tranmission and Detection (future work)
scStr.topology.jointTxRxLinks = [‘’];
% Interference Links
scStr.topology.interferenceGeneration = ‘Automatic’; % ‘Automatic’ automatically generates all possible interference links
% in this scenario the interfering links are UE1:BS2 and UE2:BS1
scStr.topology.attenuation = 107; % the interfering link attenuation is set to the same value as the desired link’s path loss
scStr.topology.interferingLinks = ; % not neccessary for automatic interference link generation
%% General Simulation Parameters
% Set link types to simulate
scStr.simulation.simulateDownlink = false;
scStr.simulation.simulateUplink = true; % Uplink only
scStr.simulation.simulateD2D = false;
scStr.simulation.frameStructure = ‘FDD’;
% Plot options
scStr.simulation.plotResultsFor = [1];
scStr.simulation.plotOverSNR = true;
scStr.simulation.plotPAPR = false;
scStr.simulation.saveData = true;
% Define a sweep parameter
scStr.simulation.sweepParam = {‘simulation.txPowerUser’}; % sweep over a user’s transmit power
scStr.simulation.sweepValue = 10:5:60; % transmit power of UE2
scStr.simulation.applySweepingTo = [0,1]; % apply sweep to second user only
% Number of simulation frames
scStr.simulation.nFrames = 500; % Number of frames to simulate per sweep value, adjust to obtain sufficiently small confidence intervals.
%% Physical Transmission Parameters
scStr.simulation.centerFrequency = 2.5e9; % center frequency
scStr.simulation.txPowerBaseStation = [30,30]; % per BS; BS total transmit power in dBm
scStr.simulation.txPowerUser = [30,30]; % per UE; UE total transmit power in dBm
scStr.simulation.codebook = ‘LTE’; % LTE or 5G
scStr.simulation.nAntennasBaseStation = [1]; % singel antenna base stations
scStr.simulation.antennaConfiguration = {[2,1],[2,1]}; % per BS: if the 5G codebook is selected, each vector represents the number of horizontal and vertical antennas[N1,N2]
scStr.simulation.nAntennasUser = [1]; % single antenna users
scStr.simulation.userVelocity = [0]; % no user velocity, static scenario
scStr.simulation.pathloss = [107]; % path loss in dB for an SNR of approx. 40dB
% Nonlinearity model
scStr.simulation.nonlinearity = false; % Apply Rapp’s PA nonlinear model: Rapp, C. “Effects of HPA-nonlinearity on a 4-DPSK/OFDM-signal for a digital sound broadcasting signal.”
scStr.simulation.amplifierOBO = [1]; % Amplifier output back-off, per Link, in dB
scStr.simulation.smoothnessFactor = [3]; % Smoothness factor for the Rapp model, per Link, >=0
%% Channel Parameters
scStr.channel.spatialChannelModel = false; % for a 3D channel, this parameter has to be set to ture
scStr.channel.dopplerModel = ‘Discrete-Jakes’; % the Doppler model is not of interest as the user velocity is zero and the scenario is static
scStr.channel.timeSubsamplingFactor = 10; % for time-varying channels (10 is a good starting point). This reduces the computational time of the channel realizations
% at the cost of some accuracy loss. Set it to 1 for no time subsampling. Check the manual for more information.
scStr.channel.correlatedFrames = false; % no time correlaltion
scStr.channel.spatialCorrelation = ‘none’; % no spatial correlation
scStr.channel.nPaths = 50; % number of propagation paths for the Doppler model
% for time correlated fading 10 is sufficient, otherwise 50 or higher
scStr.channel.powerDelayProfile = ‘PedestrianA’; % a channel model with a low RMS delay spread is chosen such that there is no ISI or ICI
scStr.channel.K = 0; % Rayleigh fading
scStr.channel.delta = 1;
%% Channel Estimation and Equalization Parameters
scStr.simulation.channelEstimationMethod = ‘Approximate-Perfect’; % assume perfect channel knowledge for this scenario
scStr.simulation.noisePowerEstimation = false;
scStr.simulation.pilotPatternDownlink = ‘Diamond’;
scStr.simulation.pilotPatternUplink = ‘Diamond’;
scStr.simulation.pilotSpacingFrequency = 6;
scStr.simulation.pilotSpacingTime = 3.5;
scStr.simulation.pilotSequenceLength = 12;
scStr.simulation.receiverTypeMIMO = ‘ZF’;
%% MIMO Parameters
% Layer mapping
scStr.layerMapping.mode = ‘5G’; % LTE, 5G or custom
scStr.layerMapping.table.Uplink = {1;2;[1,2]};
scStr.layerMapping.table.Downlink = {1;2;[1,2]};
% MIMO mode
scStr.modulation.transmissionMode = ‘custom’; % this mode allows manual settings for the feedback calculation
scStr.schedule.multiuserMode.Downlink = {‘none’};
scStr.schedule.multiuserMode.Uplink = {‘none’};
scStr.modulation.delayDiversity = 1; % 0 no delay 1 large delay diversity (only for OLSM)
%% Feedback Parameters
% feedback is disabled for this scenario
scStr.feedback.delay = 0;
scStr.feedback.averager.Type = ‘miesm’;
scStr.modulation.cqiTable = 0; % no feedback is used for this sceario
scStr.feedback.enable = false;
scStr.feedback.pmi = false;
scStr.feedback.ri = false;
scStr.feedback.cqi = false;
% RI, PMI and CQI setting
scStr.modulation.nStreams = [1, 1]; % single antenna, SISO transmission
scStr.modulation.precodingMatrix{1} = 1; % no spatial precoding matrix required
scStr.modulation.precodingMatrix{2} = 1;
scStr.modulation.mcs = [12,12]; % per link.
% MUST power allocation
scStr.modulation.MUSTIdx = [2]; % per BS; the power allocation index of the 3GPP MUST mode = {0, 1, 2, 3}.
%% Modulation Parameters
% Waveform
scStr.modulation.waveform = {‘OFDM’,‘FBMC’}; % you may want to try ‘f-OFDM’ or ‘FBMC’ in this scenario
scStr.modulation.spreadingTransformDownlink = ‘none’;
scStr.modulation.spreadingTransformUplink = ‘none’;
% Parameters for FBMC
scStr.modulation.prototypeFilter = ‘PHYDYAS-OQAM’; % prototype filter for FBMC
% Parameters for UFMC
scStr.modulation.nSubcarriersPerSubband = [12]; % number of subcarriers per subband
% Time and bandwidth setup (number of subcarriers, frame duration, CP length, sampling rate)
scStr.modulation.numberOfSubcarriers = [72,36]; % per BS; number of used subcarriers
scStr.modulation.subcarrierSpacing = [15e3,30e3]; % per BS; per base station in Hz
scStr.modulation.nSymbolsTotal = [15,30]; % per BS; total number of time-symbols per frame, the frame duration will be nSymbolsTotal/subcarrierSpacing
scStr.modulation.nGuardSymbols = [1,2]; % per BS; select how many of the total time-symbols will be used as guard symbols (cyclic prefix in OFDM)
scStr.modulation.samplingRate = ‘Automatic’; % sampling rate has to be the same for all nodes (across all base stations):
% either numeric value for manual setting or ‘Automatic’
%% Channel Coding Parameters
scStr.coding.code = {‘LDPC’}; % LDPC channel coding
scStr.coding.decoding = {‘PWL-Min-Sum’};
scStr.coding.decodingIterations = [16]; % number of decoding iterations
scStr.coding.LLRsCalculationMethod = ‘Max-Log’;
scStr.coding.softBufferRatio = [1];
%% Schedule
% static schedule per base station
scStr.schedule.fixedScheduleDL{1} = ; % schedule for BS1 downlink
scStr.schedule.fixedScheduleUL{1} = [‘UE1:34,none:38’]; % schedule for BS1 uplink
scStr.schedule.fixedScheduleUL{2} = [‘none:19,UE2:17’]; % schedule for BS2 uplink