ASK and Manchester demodulation

I'm doing a matlab exercise where I've been given a wav file which represents a black and white image of size 300 x 300 pixels. I have to demodulate the wav file in order to recover the original signal.

I know that the signal is transmitted using manchester coding and that it is transmitted using Amplitude Shift Keying (ASK). I also know that the carrier frequency is 1000 Hz and the data is trasmitted row after row. The sampling rate of the wav file is 5000 Hz. Finally, I also know that at the end of each row, an 'end-of-row' signal is transmitted (5 periods of a sinusoid wave at half the frequency of the carrier)

My attempt at this so far has been to multiply the received signal with the carrier and then use a low-pass filer in order to extract the original signal since I know that ASK has been used.

I'm assuming that the next step would be to identify the different rows and then decode the Manchester scheme in order to get the actual data, but I can't figure out how to detect the 'end-of-row' signal in the data that I have. Any advice on how to go about this would be highly appreciated.

Answer 1

[Ye]

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