Unexpected two sets of IQ samples from nrCDLChannel nrTDLChannel

Hello

I am trying to introduce channel models to my IQ signal data via python and connected to matlab.engine.

```

def initialize_channel_models(mateng):

# Configure the single antenna array in MATLAB

mateng.eng.eval("single_antenna = struct();", nargout=0)

mateng.eng.eval("single_antenna.Size = [1, 1, 1, 1, 1];", nargout=0)

mateng.eng.eval("single_antenna.ElementSpacing = [0.5, 0.5, 1, 1];", nargout=0)

mateng.eng.eval("single_antenna.PolarizationAngles = 45;", nargout=0)

mateng.eng.eval("single_antenna.PolarizationModel = 'Model-2';", nargout=0)

mateng.eng.eval("single_antenna.Element = '38.901';", nargout=0)

single_antenna = mateng.eng.workspace['single_antenna']

nrcdl = mateng.eng.nrCDLChannel('DelayProfile', 'CDL-C', 'NormalizePathGains', True, 'TransmitAntennaArray', single_antenna)

nrtdl = mateng.eng.nrTDLChannel('DelayProfile', 'TDL-C', 'NormalizePathGains', True)

rayleigh = mateng.eng.comm.RayleighChannel('SampleRate', float(20e6), 'PathDelays', float(1.5e-9), 'AveragePathGains', float(-3), 'PathGainsOutputPort', True)

return {'NRCDL': nrcdl, 'NRTDL': nrtdl, 'Rayleigh': rayleigh}

```

Once applied to my waveform, rayleigh data returns one set of real and imaginary IQ data, but CDL and TDL returns two sets of it. I assumed it was because of the two polarization states, changed that to single as shown above, but I still get two sets of IQ samples. Additionally, this is also occuring for nrTDL data that does not involve the transmit antenna. Are two sets of data expected? What do they represent?

Best

Hud