Advanced Telecommunications: OFDM System Design and Simulation

Running head: ADVANCED TELECOMMUNICATIONS
ADVANCED TELECOMMUNICATIONS
Name of the Student
Name of the University
Author Note

ADVANCED TELECOMMUNICATIONS1
Part 2:
Now, the channel time delay factor and the delayed relative power factor of the channel is
obtained from the channel.mat file and the multipath impulse response of the channel is
calculated along with the RMS delay spread of the channel as given below by the following
MATLAB code.
MATLAB code:
load 'channel.mat'
rms_delay = std(tvec)*(length(tvec)- 1);
fprintf('The rms delay of the channel is %.4f secs',rms_delay)
channel.Seed = 1;
channel.NRxAnts = 2;
channel.DelayProfile = 'EVA';
channel.DopplerFreq = 300;
channel.CarrierFreq = 2e9;
channel.MIMOCorrelation = 'Low';
channel.SamplingRate = 1/10e-9;
channel.InitTime = 0;
nAntIn = 2;

ADVANCED TELECOMMUNICATIONS2
impulseSpacing = 300;
noImpResponse = 150;
nInputSamples = impulseSpacing * noImpResponse;
in = zeros(nInputSamples, nAntIn);
onesLocations = 1:impulseSpacing:nInputSamples;
in(onesLocations,1) = 1;
out = lteFadingChannel(channel, in);
for antNo = 1:channel.NRxAnts
figure
mesh(squeeze(abs(reshape(out(:,antNo), ...
impulseSpacing,noImpResponse).')))
titleStr = ['Rx Antenna' num2str(antNo)];
title({'Channel Impulse Response',titleStr})
ylabel('number of impulses')
xlabel('Impulse spacing [no of samples]')
zlabel('|H|')
end

ADVANCED TELECOMMUNICATIONS3
Output:
The rms delay of the channel is 4155.4783 secs
The Coherence bandwidth of the channel is 0.0010 Hz
The coherence bandwidth of a channel is measurement of frequency over which the channel
is ‘flat’. The coherence bandwidth Wc in rad/sec is approximately given by
Bc = 1/D.
Where, D = multipath delay spread.