OFDM Radar and Micro doppler signal analyzing simulator

Hi can you help me to find a MATLAB code for a simulator which build to plot micro doppler signal which caused using a OFDM Radar?

Answer 1

[Abhimenyu]

Hi Lashani,

I understand that you are looking for the code to plot the micro doppler system using OFDM radar.

Here is the sample code for the same:

% Define all the parameters for OFDM and modulation 

% fs Sampling frequency (Hz) 
% T Sampling period (s) 
% fc Carrier frequency (Hz) 
% f0 Target rotation frequency (Hz) 
% B Bandwidth (Hz) 
% N Number of subcarriers 
% Tysm OFDM symbol duration (s) 
% Ts Subcarrier spacing (s) 
% t Time vector 

% Generate OFDM subcarriers 
subcarriers = zeros(N, length(t)); 
for i = 1:N 
    subcarriers(i, :) = exp(1i*2*pi*(fc + (i-N/2-1)*Ts)*t); 
end 

% Generate target rotation modulation 
modulation = exp(1i*2*pi*f0*t); 

% Generate received signal 
received_signal = sum(subcarriers) .* modulation; 

% Perform FFT to obtain Doppler spectrum 
doppler_spectrum = fftshift(fft(received_signal)); 

% Frequency axis for plotting 
f = (-fs/2:fs/N:fs/2-fs/N) + fc; 

% Plot Doppler spectrum 
figure; 
plot(f, abs(doppler_spectrum)); 
xlabel('Frequency (Hz)'); 
ylabel('Magnitude'); 
title('Micro-Doppler Signal'); 

For more details on doppler estimation and OFDM, kindly go through the below links:

• Doppler Estimation - https://www.mathworks.com/help/releases/R2023a/phased/ug/doppler-estimation.html
• Wireless Communications - https://in.mathworks.com/help/releases/R2023a/phased/mimo-communication.html

Thank you,

Abhimenyu.