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Update Plot_TV_THz_Channel.m
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@Simon-Tarboush
Simon-Tarboush authored May 17, 2021
1 parent 824cd68 commit aa5b0a3
Showing 1 changed file with 57 additions and 53 deletions.
110 changes: 57 additions & 53 deletions Visualization/Plot_TV_THz_Channel.m
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Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
function Plot_TV_THz_Channel(p, H, h, fd_max_subcarriers ,num_of_plots)

% =========================================================================
% -- Function to generate plots for the frequency and delay domain time-variant THz channel,
% and to check the time correlation between channel taps
Expand All @@ -18,8 +17,8 @@ function Plot_TV_THz_Channel(p, H, h, fd_max_subcarriers ,num_of_plots)

% =========================================================================

% -- (c) 2021 Simon Tarboush, Hadi Sarieddeen, Hui Chen,
% Mohamed Habib Loukil, Hakim Jemaa,
% -- (c) 2021 Simon Tarboush, Hadi Sarieddeen, Hui Chen,
% Mohamed Habib Loukil, Hakim Jemaa,
% Mohamed-Slim Alouini, Tareq Y. Al-Naffouri

% -- e-mail: [email protected]; [email protected]; [email protected];
Expand All @@ -28,7 +27,7 @@ function Plot_TV_THz_Channel(p, H, h, fd_max_subcarriers ,num_of_plots)

% =========================================================================

% S. Tarboush, H. Sarieddeen, H. Chen, M.-H. Loukil, H. Jemaa, M.-S. Alouini, and T. Y. Al-Naffouri,
% S. Tarboush, H. Sarieddeen, H. Chen, M.-H. Loukil, H. Jemaa, M.-S. Alouini, and T. Y. Al-Naffouri,
% "TeraMIMO: A channel simulator for wideband ultra-massive MIMO terahertz communications,"
% arXivpreprint arXiv:2104.11054, 2021.

Expand All @@ -38,73 +37,78 @@ function Plot_TV_THz_Channel(p, H, h, fd_max_subcarriers ,num_of_plots)
num_freq_subband = p.Nsubc;
vec_time = randi(p.nSamplesperFrame,1,num_of_plots);

for rx_ind = 1 : size(h,1)
for tx_ind = 1: size(h,2)
for subb_ind = 1: size(h,3)

h_temp = h{rx_ind,tx_ind,subb_ind};

for time_ind = 1: length(vec_time)

f = p.freq(:,subb_ind)/1e12;% Frequency vector (THz)

%%%%%% Magnitude of Frequency Domain %%%%%
HH = H(rx_ind,tx_ind,subb_ind,vec_time(time_ind),:);
H_temp1 = fft(h_temp(vec_time(time_ind),:),num_freq_subband);
figure();
plot(f,mag2db(squeeze(abs(HH))),...
'Color','b','Marker','o');hold on;
plot(f,mag2db(abs(H_temp1)),...
'Color','r','Marker','x');
title('Channel Frequency Response');
xlabel('Frequency (THz)');
ylabel('Path Gain (dB)');
legend('Freq. Domain','From Delay Domain');
hold off;

%%%%%% Magnitude of Delay Domain %%%%%
h1 = ifft(H(rx_ind,tx_ind,subb_ind,vec_time(time_ind),:));
t_vec1 = (1:length(h1))*Ts/1e-9;
t_vec = (1:length(h_temp(vec_time(time_ind),:)))*Ts/1e-9;
figure();
stem(t_vec1, squeeze(abs(h1)), ...
'Color','b',...
'LineStyle','-.','Marker','o');
hold on;
stem(t_vec, squeeze(abs(h_temp(vec_time(time_ind),:))),...
'Color','r', ...
'LineStyle','--','Marker','*');
title('Delay-Domain Channel'); % Impulse response
xlabel('$\tau (nsec) $','Interpreter','latex');
ylabel('Magnitude');
legend('From Freq. Domain','Delay Domain');
hold off;

end
end
rx_ind = 1;
tx_ind = 1;
if size(h,3) <= 3
slec_ind = 1:size(h,3);
else
slec_ind = [1, ceil(size(h,3)/2) size(h,3)];
end
for indx = 1: length(slec_ind)
subc_ind = slec_ind(indx);
h_temp = h{rx_ind,tx_ind,subc_ind};

for time_ind = 1: length(vec_time)

f = p.freq(:,subc_ind)/1e12;% Frequency vector (THz)

%%%%%% Magnitude of Frequency Domain %%%%%
HH = H(rx_ind,tx_ind,subc_ind,vec_time(time_ind),:);
H_temp1 = fft(h_temp(vec_time(time_ind),:),num_freq_subband);
figure();
plot(f,mag2db(squeeze(abs(HH))),...
'Color','b','Marker','o');hold on;
plot(f,mag2db(abs(H_temp1)),...
'Color','r','Marker','x');
title(strcat('Channel frequency response, subcarrier ',num2str(subc_ind), ...
', (Rx,Tx) pair (',num2str(rx_ind),',',num2str(tx_ind),')'));
xlabel('Frequency (THz)');
ylabel('Path Gain (dB)');
legend('Freq. Domain','From Delay Domain');
hold off;

%%%%%% Magnitude of Delay Domain %%%%%
h1 = ifft(H(rx_ind,tx_ind,subc_ind,vec_time(time_ind),:));
t_vec1 = (1:length(h1))*Ts/1e-9;
t_vec = (1:length(h_temp(vec_time(time_ind),:)))*Ts/1e-9;
figure();
stem(t_vec1, squeeze(abs(h1)), ...
'Color','b',...
'LineStyle','-.','Marker','o');
hold on;
stem(t_vec, squeeze(abs(h_temp(vec_time(time_ind),:))),...
'Color','r', ...
'LineStyle','--','Marker','*');
title(strcat('Channel delay-domain, subcarrier ',num2str(subc_ind), ...
', (Rx,Tx) pair (',num2str(rx_ind),',',num2str(tx_ind),')'));
xlabel('$\tau (nsec) $','Interpreter','latex');
ylabel('Magnitude');
legend('From Freq. Domain','Delay Domain');
hold off;

end
end
%%%%%% Correlation between paths %%%%%
% Select maximum path gain only
t = 0:Ts:Ts*(p.nSamplesperFrame-1);
for rx_ind = 1 : size(h,1)
for tx_ind = 1: size(h,2)
for subb_ind = 1: size(h,3)
for subc_ind = 1: size(h,3)

h_temp2 = h{rx_ind,tx_ind,subb_ind};
h_temp2 = h{rx_ind,tx_ind,subc_ind};
% find max path gain
[~, indx_h_max_g ] = max(abs(h_temp2(1,:)));
h_max_g = squeeze(h_temp2(:,indx_h_max_g));

Acn = xcorr(h_max_g,'biased');
Acn_pos = Acn(p.nSamplesperFrame:end).';
Acn_pos = Acn_pos/max(Acn_pos);

switch p.DopplerSpecShape
case 'Jakes'
Ac_th = besselj(0,2*pi*fd_max_subcarriers(1,subb_ind)*t);
Ac_th = besselj(0,2*pi*fd_max_subcarriers(1,subc_ind)*t);
case 'Flat'
Ac_th = sinc(2*fd_max_subcarriers(1,subb_ind)*t);
Ac_th = sinc(2*fd_max_subcarriers(1,subc_ind)*t);
otherwise
error('The Selected Doppler Spectrum Shape isn''t supported, Options: Jakes, Flat, ...')
end
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