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authorNao Pross <np@0hm.ch>2021-12-16 11:25:20 +0100
committerNao Pross <np@0hm.ch>2021-12-16 11:25:20 +0100
commitc3c51bdf37bb92124b8995e82e9463a19846ab19 (patch)
tree56f46137d619a94e59d0d1d822715ac47b4be472 /src/gr-fadingui/python
parentSmall corrections (diff)
downloadFading-c3c51bdf37bb92124b8995e82e9463a19846ab19.tar.gz
Fading-c3c51bdf37bb92124b8995e82e9463a19846ab19.zip
Clean up multipath_fading code
Diffstat (limited to 'src/gr-fadingui/python')
-rw-r--r--src/gr-fadingui/python/multipath_fading.py95
1 files changed, 30 insertions, 65 deletions
diff --git a/src/gr-fadingui/python/multipath_fading.py b/src/gr-fadingui/python/multipath_fading.py
index 3c34a79..dc7fcc1 100644
--- a/src/gr-fadingui/python/multipath_fading.py
+++ b/src/gr-fadingui/python/multipath_fading.py
@@ -31,87 +31,52 @@ class multipath_fading(gr.sync_block):
"""
docstring for block multipath_fading
"""
- def __init__(self, amplitudes, delays, los): # only default arguments here
- """arguments to this function show up as parameters in GRC"""
+ def __init__(self, amplitudes, delays, los):
gr.sync_block.__init__(
self,
- name='Embedded Python Block', # will show up in GRC
+ name='Multipath fading',
in_sig=[np.complex64],
out_sig=[np.complex64]
)
- # if an attribute with the same name as a parameter is found,
- # a callback is registered (properties work, too).
+
+ if len(amplitudes) != len(delays):
+ raise Exception("Amplitudes and Delay length dont match")
+
+ if np.min(delays) < 0:
+ raise Exception("Delay can't be negative")
+
self.amplitudes = amplitudes
self.delays = delays
self.temp = [0]
- log.debug(los) #TO DO: True False unterscheidung
- if los == True:
- self.los = 1
- log.debug("Los True")
- else:
- self.los = 0
- log.debug("Los False")
-
-
-
-
+ self.los = 1 if los else 0
def work(self, input_items, output_items):
- """example: multiply with constant"""
inp = input_items[0]
oup = output_items[0]
-
-
- if len(self.amplitudes) != len(self.delays): # Test: Es muss gleich viele Werte für Delays und Amplituden haben.
- raise Exception("Amplitudes and Delay length dont match")
- if np.min(self.delays)<0: #Negativ Check
- raise Exception("Delay can't be negativ")
-
-
- # raise Exception("Delay length can't be one")
- #if np.min(self.delays)<=1:
- # raise Exception("Delay length can't be one")
-
-
- max_order = 2 * np.floor(np.max(self.delays)) + 1 #Max Werte herausfinden für länge
+ max_order = 2 * np.floor(np.max(self.delays)) + 1
max_samples = np.arange(0, max_order +1)
- max_len = len(max_samples) #Für Filter
+ max_len = len(max_samples)
- sum_x = np.zeros(int(max_len))
+ tot_h = np.zeros(int(max_len))
- for (a,d) in zip(self.amplitudes,self.delays):
- # if d-1 <= 0:
- # x = np.concatenate([[a], np.zeros(max_len-1)])
- # else:
+ for (a, d) in zip(self.amplitudes, self.delays):
order = 2 * np.floor(d) + 1
-
- skip = np.floor(d) - (order - 1) / 2 #M sollte immer 0 sein
- assert skip >= 0
-
- samples = np.arange(0, order +1)
-
- h = a*(np.sinc(samples-d)) #sinc
- h_len = np.concatenate([h, np.zeros(max_len-len(h))])
-
- sum_x += h_len
-
- #x = np.concatenate([np.zeros(d-1), [a], np.zeros(max_len-d)])
- #sum_x += x
-
- sum_x[0] = self.los
- #log.debug(sum_x)
-
-
- y = np.convolve(inp, sum_x)
-
- # signal_shifted = np.convolve(h, inp, mode='full')
- # y = signal_shifted
-
- y+=np.concatenate([self.temp,np.zeros(len(y)-len(self.temp))])
-
+ samples = np.arange(0, order +1)
+ # compute FIR
+ h = a * np.sinc(samples - d)
+ # adjust length
+ h = np.concatenate([h, np.zeros(max_len - len(h))])
+ tot_h += h
+
+ tot_h[0] += self.los
+
+ # compute output and add rest from last block processing
+ y = np.convolve(inp, tot_h)
+ y += np.concatenate([self.temp, np.zeros(len(y) - len(self.temp))])
+ # write output
oup[:] = y[:len(inp)]
- self.temp = y[len(inp):]
-
+ # save for next block processing
+ self.temp = y[len(inp):]
- return len(oup) \ No newline at end of file
+ return len(oup)