Is it possible to get different path gains for different carrier frequencies from nrCDLChannel object?

While creating two channels with two different carrier frequencies, is it wrong to expect different sets of path gains?

These two channels return the exact same path gains, if this is correct, then I would like to understand what the Fc has an effect on.

cdl4 = nrCDLChannel;
cdl4.DelayProfile = 'CDL-D';
cdl4.MaximumDopplerShift = 300.0;
cdl4.SampleRate = 1e3;
cdl4.Seed = 19;
cdl4.TransmitAntennaArray.Size = [1 4 2 1 1];
cdl4.ReceiveAntennaArray.Size = [1 1 2 1 1];
cdl4.CarrierFrequency = 3.5000e+09;
cdl4.ChannelFiltering = false;
% cdl4.NormalizePathGains = false;
cdl4.OutputDataType = "single";
% cdl4.TransmitArrayOrientation = [0 15 0]';
cdlinfo4 = info(cdl4);
[pathGains4,~] = cdl4();

cdl4b = nrCDLChannel;
cdl4b.DelayProfile = 'CDL-D';
cdl4b.MaximumDopplerShift = 300.0;
cdl4b.SampleRate = 1e3;
cdl4b.Seed = 19;
cdl4b.TransmitAntennaArray.Size = [1 4 2 1 1];
cdl4b.ReceiveAntennaArray.Size = [1 1 2 1 1];
cdl4b.CarrierFrequency = 1.5000e+09;
cdl4b.ChannelFiltering = false;
% cdl4.NormalizePathGains = false;
cdl4b.OutputDataType = "single";
% cdl4.TransmitArrayOrientation = [0 15 0]';
cdlinfo4b = info(cdl4b);
[pathGains4b,~] = cdl4b();

Thank you.

Answer 1

[Manish]

Hi,

I understand that you want to know why the path gains remain the same even when the carrier frequencies are different.

The reason is that the ‘nrCDLChannel’ object models the channel with a fixed delay profile and Doppler shift, which are not inherently dependent on the carrier frequency, as the carrier frequency is the geometric aspects of the channel.

To achieve different path gains, adjust the delay profile and dynamically modify the Doppler shift based on the carrier frequency.

You can refer to the link below to learn more about the 'nrCDLChannel' function:

• https://www.mathworks.com/help/5g/ref/nrcdlchannel-system-object.html

Hope this helps!