how to apply matched filter for linear frequency modulated signal which data is in matrix?

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Divyasai Mandalapu 2021-10-14

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回答： Ashutosh Singh Baghel 2021-10-21

load TRACK515_1.mat;

a= (Channel_1_Data);

b= (Channel_2_Data);

c= (Channel_3_Data);

final_matrix= [a b c ];

waterfall(final_matrix(1000:3000,:)');

(** i want to apply matched filter to every channel)

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Divyasai Mandalapu 2021-10-14

I am transmitting a sound signal from the transmitter and receiving the signals.the received signal is recorded and I converted them into .matfile and I have data in matrix. Now I want to apply matched filter to the received data. The signal I am transmitting is linear frequency modulated signal as a sound.

Mathieu NOE 2021-10-14

ok

I may not be very famailiar with the concept of linear frequency modulated signal

and how is defined a filter that is matched (...to what ?)

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Answer 1

Ashutosh Singh Baghel 2021-10-21

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在 MATLAB Online 中打开

Hi Divyasai,

I believe you wish to apply matched filtering to the signal received. Matched filtering increases the SNR of signals and improves detection performance. Here is an example to refer.

waveform = phased.LinearFMWaveform('PulseWidth',1e-4,'PRF',5e3);

x = waveform();

filter = phased.MatchedFilter( ...

'Coefficients',getMatchedFilter(waveform));

y = filter(x);

subplot(2,1,1),plot(real(x))

xlabel('Samples')

ylabel('Amplitude')

title('Input Signal')

subplot(2,1,2),plot(real(y))

xlabel('Samples')

ylabel('Amplitude')