hamnet70-gnuradio-legacy/utils/filter_preamble.py

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2019-06-20 16:57:12 +02:00
#!/usr/bin/env python3
import numpy as np
import matplotlib.pyplot as pp
import rrc
pre = [1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, -1, 1,
-1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1,
1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1,
-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1,
-1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1,
-1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1,
1, -1, -1, 1, 1, 1, 1]
pre_up = np.zeros(2 * len(pre) + 1)
pre_up[1::2] = pre
rrc_coef = rrc.rrc_design(150, 2)
pre_flt = np.convolve(pre_up, rrc_coef, mode='same')
print(list(pre_flt))
pp.plot(pre_up)
pp.plot(pre_flt)
pp.show()