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Added channel impulse response. Try shifting the one around in the response in channel.py, it's pretty cool

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David Lenfesty 2019-08-25 18:29:24 -06:00
parent 6666efee1b
commit 6f09910060
3 changed files with 13 additions and 5 deletions
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8
channel.py
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@ -1,12 +1,14 @@
import numpy as np import numpy as np
channel_response = np.array([1, 0, 1 - 1j]) channel_response = np.array([0, 0, 0, 1, 0, 0, 0])
def sim(in_data): def sim(in_data):
out_data = np.ndarray((len(in_data), len(in_data[0])), dtype=np.csingle) out_data = np.ndarray((len(in_data), len(in_data[0])), dtype=np.csingle)
for i in range(len(in_data)): for i in range(len(in_data)):
convolved = np.convolve(channel_response, in_data[i]) convolved = np.convolve(channel_response, in_data[i], mode='same')
out_data[i] = convolved
return out_data

4
data.txt
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@ -1 +1,5 @@
The quick brown fox jumped over the lazy dog. The quick brown fox jumped over the lazy dog.
I can transmit arbitrary data as it stands, and it gets correctly decoded,
obviously assuming there is no error. Adding and then correcting for that error
is my next step.

6
main.py
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@ -54,11 +54,13 @@ if __name__ == '__main__':
ofdm_time = np.fft.ifft(modulated) ofdm_time = np.fft.ifft(modulated)
ofdm_prefixed = cp_add(ofdm_time, 4) tx = cp_add(ofdm_time, 4)
rx = channel.sim(tx)
# Put the channel simulator stuff here # Put the channel simulator stuff here
ofdm_cp_removed = cp_remove(ofdm_prefixed, 4) ofdm_cp_removed = cp_remove(rx, 4)
to_decode = np.fft.fft(ofdm_cp_removed) to_decode = np.fft.fft(ofdm_cp_removed)