How to reduce the sample rate of a over sampled signal? (How to connect data to lines and sample?)

7 views (last 30 days)
Hi Team,
I have a set of date, for example, sampled at 491.52-MHz. However, I want them to be sampled at 300-MHz using matlab processing. I am thinking I should use the original 491.52-MHz sampled data to reconstruct the original signal and then sample the new reconstructed signal with 300-MHz sample rate. Can anyone help me how to achieve it
The 491.52-MHz data is in attachment.

Accepted Answer

Star Strider
Star Strider on 10 Aug 2019
Working with your Excel file was something of an adventure!
I assume ‘n’ are nanoseconds and ‘u’ are microseconds. The plot works correctly with those assumptions.
Try this:
[D,S] = xlsread('1.csv');
t = cellfun(@(x)sscanf(x, '%f'), S(3:end,3), 'Uni',0); % Recover Time Vector
nu = regexp(S(:,3), '[un]', 'match'); % Recover ‘n’ & ‘u’
nv = strcmp([nu{:}],'n'); % Logical Vector: ‘n’
uv = strcmp([nu{:}],'u'); % Logical Vector: ‘u’
mult = [[0, nv(nv)]*1E-9, uv(uv)*1E-6]; % Create Multiplier Vector From ‘n’ and ‘u’
t = cell2mat([D(1,1); t]); % Concatenate With Initial ‘t’
tv = t .* mult(:); % Reconstruct ‘t’ With Multipliers
s = D(:,2); % Signal Vector
ts = sortrows([tv, s]); % Reconstructed Time & Waveform Matrix
% Ts = mean(diff(ts(:,1))), Tsd = std(diff(ts(:,1))), Fs = 1/Ts % Original Values
Fs = 300E+6; % Desired Resampling Frequency: 300MHz
[sr, tr] = resample(ts(:,2), ts(:,1), Fs); % Resample Using Original ‘t’ & ‘s’
plot(ts(:,1), ts(:,2))
title('Original Signal')
plot(tr, sr)
title('Resampled Signal')
That should give you the resultl you want.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!