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Transmission Over MIMO Channel Model with Delay Profile TDL

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Display the waveform spectrum received through a tapped delay line (TDL) multi-input/multi-output (MIMO) channel model from TR 38.901 Section 7.7.2 using annrTDLChannelSystem object.

Define the channel configuration structure using annrTDLChannelSystem object. Use delay profile TDL-C from TR 38.901 Section 7.7.2, a delay spread of 300 ns, and UE velocity of 30 km/h:

v = 30.0;% UE velocity in km/hfc = 4e9;% carrier frequency in Hzc = physconst('lightspeed');% speed of light in m/sfd = (v*1000/3600)/c*fc;% UE max Doppler frequency in Hztdl = nrTDLChannel; tdl.DelayProfile ='TDL-C'; tdl.DelaySpread = 300e-9; tdl.MaximumDopplerShift = fd;

Create a random waveform of 1 subframe duration with 1 antenna.

SR = 30.72e6; T = SR * 1e-3; tdl.SampleRate = SR; tdlinfo = info(tdl); Nt = tdlinfo.NumTransmitAntennas; txWaveform = complex(randn(T,Nt),randn(T,Nt));

Transmit the input waveform through the channel.

rxWaveform = tdl(txWaveform);

Plot the received waveform spectrum.

analyzer = dsp.SpectrumAnalyzer('SampleRate',tdl.SampleRate,...'AveragingMethod','Exponential','ForgettingFactor',0.99 ); analyzer.Title = ['Received Signal Spectrum 'tdl.DelayProfile]; analyzer(rxWaveform);

Figure Spectrum Analyzer contains an axes object and other objects of type uiflowcontainer, uimenu, uitoolbar. The axes object with title Received Signal Spectrum TDL-C contains 2 objects of type line. These objects represent Channel 1, Channel 2.

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