diff --git a/python/physical_layer/HFDL_ARINC635.py b/python/physical_layer/HFDL_ARINC635.py
index 44564fc..3b57e79 100644
--- a/python/physical_layer/HFDL_ARINC635.py
+++ b/python/physical_layer/HFDL_ARINC635.py
@@ -2,13 +2,13 @@
 
 from __future__ import print_function
 import numpy as np
-import common
+from . import common
 from digitalhf.digitalhf_swig import viterbi27
 
 ## ---- constellatios -----------------------------------------------------------
-BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
-QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4]), common.CONST_DTYPE)
+BPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1])), common.CONST_DTYPE)
+QPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2])), common.CONST_DTYPE)
+PSK8=np.array(list(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4])), common.CONST_DTYPE)
 
 ## ---- constellation indices ---------------------------------------------------
 MODE_BPSK=0
diff --git a/python/physical_layer/MIL_STD_188_110A.py b/python/physical_layer/MIL_STD_188_110A.py
index f24b8ed..f04e380 100644
--- a/python/physical_layer/MIL_STD_188_110A.py
+++ b/python/physical_layer/MIL_STD_188_110A.py
@@ -2,7 +2,7 @@
 
 from __future__ import print_function
 import numpy as np
-import common
+from . import common
 from digitalhf.digitalhf_swig import viterbi27
 
 ## ---- Walsh-8 codes -----------------------------------------------------------
@@ -76,9 +76,9 @@ class ScrambleData(object):
         return self._state
 
 ## ---- constellatios -----------------------------------------------------------
-BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
-QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4]), common.CONST_DTYPE)
+BPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1])), common.CONST_DTYPE)
+QPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2])), common.CONST_DTYPE)
+PSK8=np.array(list(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4])), common.CONST_DTYPE)
 
 ## ---- constellation indices ---------------------------------------------------
 MODE_BPSK=0
diff --git a/python/physical_layer/MIL_STD_188_110C.py b/python/physical_layer/MIL_STD_188_110C.py
index 29334aa..0dbbc70 100644
--- a/python/physical_layer/MIL_STD_188_110C.py
+++ b/python/physical_layer/MIL_STD_188_110C.py
@@ -2,21 +2,21 @@
 
 from __future__ import print_function
 import numpy as np
-import common
+from . import common
 from digitalhf.digitalhf_swig import viterbi27
 
 ## ---- constellations -----------------------------------------------------------
-BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
-QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [1,0,2,3,7,6,4,5]), common.CONST_DTYPE)
+BPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1])), common.CONST_DTYPE)
+QPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2])), common.CONST_DTYPE)
+PSK8=np.array(list(zip(np.exp(2j*np.pi*np.arange(8)/8), [1,0,2,3,7,6,4,5])), common.CONST_DTYPE)
 QAM16=np.array(
-    zip([+0.866025+0.500000j,  0.500000+0.866025j,  1.000000+0.000000j,  0.258819+0.258819j,
+    list(zip([+0.866025+0.500000j,  0.500000+0.866025j,  1.000000+0.000000j,  0.258819+0.258819j,
          -0.500000+0.866025j,  0.000000+1.000000j, -0.866025+0.500000j, -0.258819+0.258819j,
          +0.500000-0.866025j,  0.000000-1.000000j,  0.866025-0.500000j,  0.258819-0.258819j,
          -0.866025-0.500000j, -0.500000-0.866025j, -1.000000+0.000000j, -0.258819-0.258819j],
-        range(16)), common.CONST_DTYPE)
+        range(16))), common.CONST_DTYPE)
 QAM32=np.array(
-    zip([+0.866380+0.499386j,  0.984849+0.173415j,  0.499386+0.866380j,  0.173415+0.984849j,
+    list(zip([+0.866380+0.499386j,  0.984849+0.173415j,  0.499386+0.866380j,  0.173415+0.984849j,
          +0.520246+0.520246j,  0.520246+0.173415j,  0.173415+0.520246j,  0.173415+0.173415j,
          -0.866380+0.499386j, -0.984849+0.173415j, -0.499386+0.866380j, -0.173415+0.984849j,
          -0.520246+0.520246j, -0.520246+0.173415j, -0.173415+0.520246j, -0.173415+0.173415j,
@@ -24,9 +24,9 @@ QAM32=np.array(
          +0.520246-0.520246j,  0.520246-0.173415j,  0.173415-0.520246j,  0.173415-0.173415j,
          -0.866380-0.499386j, -0.984849-0.173415j, -0.499386-0.866380j, -0.173415-0.984849j,
          -0.520246-0.520246j, -0.520246-0.173415j, -0.173415-0.520246j, -0.173415-0.173415j],
-        range(32)), common.CONST_DTYPE)
+        range(32))), common.CONST_DTYPE)
 QAM64=np.array(
-    zip([+1.000000+0.000000j,  0.822878+0.568218j,  0.821137+0.152996j,  0.932897+0.360142j,
+    list(zip([+1.000000+0.000000j,  0.822878+0.568218j,  0.821137+0.152996j,  0.932897+0.360142j,
          +0.000000-1.000000j,  0.822878-0.568218j,  0.821137-0.152996j,  0.932897-0.360142j,
          +0.568218+0.822878j,  0.588429+0.588429j,  0.588429+0.117686j,  0.588429+0.353057j,
          +0.568218-0.822878j,  0.588429-0.588429j,  0.588429-0.117686j,  0.588429-0.353057j,
@@ -42,7 +42,7 @@ QAM64=np.array(
          -0.152996-0.821137j, -0.117686-0.588429j, -0.117686-0.117686j, -0.117686-0.353057j,
          -0.360142+0.932897j, -0.353057+0.588429j, -0.353057+0.117686j, -0.353057+0.353057j,
          -0.360142-0.932897j, -0.353057-0.588429j, -0.353057-0.117686j, -0.353057-0.353057j],
-        range(64)), common.CONST_DTYPE)
+        range(64))), common.CONST_DTYPE)
 
 ## for test
 QAM64p = QAM64[(3,24,56,35,39,60,28,7),]
diff --git a/python/physical_layer/MIL_STD_188_110D.py b/python/physical_layer/MIL_STD_188_110D.py
index e6c91ab..328c86b 100644
--- a/python/physical_layer/MIL_STD_188_110D.py
+++ b/python/physical_layer/MIL_STD_188_110D.py
@@ -2,21 +2,21 @@
 
 from __future__ import print_function
 import numpy as np
-import common
+from . import common
 from digitalhf.digitalhf_swig import viterbi27, viterbi29
 
 ## ---- constellations ---------------------------------------------------------
-BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
-QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [1,0,2,3,7,6,4,5]), common.CONST_DTYPE)
+BPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1])), common.CONST_DTYPE)
+QPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2])), common.CONST_DTYPE)
+PSK8=np.array(list(zip(np.exp(2j*np.pi*np.arange(8)/8), [1,0,2,3,7,6,4,5])), common.CONST_DTYPE)
 QAM16=np.array(
-    zip([+0.866025+0.500000j, +0.500000+0.866025j, +1.000000+0.000000j, +0.258819+0.258819j,
+    list(zip([+0.866025+0.500000j, +0.500000+0.866025j, +1.000000+0.000000j, +0.258819+0.258819j,
          -0.500000+0.866025j, +0.000000+1.000000j, -0.866025+0.500000j, -0.258819+0.258819j,
          +0.500000-0.866025j, +0.000000-1.000000j, +0.866025-0.500000j, +0.258819-0.258819j,
          -0.866025-0.500000j, -0.500000-0.866025j, -1.000000+0.000000j, -0.258819-0.258819j],
-        range(16)), common.CONST_DTYPE)
+        range(16))), common.CONST_DTYPE)
 QAM32=np.array(
-    zip([+0.866380+0.499386j, +0.984849+0.173415j, +0.499386+0.866380j, +0.173415+0.984849j,
+    list(zip([+0.866380+0.499386j, +0.984849+0.173415j, +0.499386+0.866380j, +0.173415+0.984849j,
          +0.520246+0.520246j, +0.520246+0.173415j, +0.173415+0.520246j, +0.173415+0.173415j,
          -0.866380+0.499386j, -0.984849+0.173415j, -0.499386+0.866380j, -0.173415+0.984849j,
          -0.520246+0.520246j, -0.520246+0.173415j, -0.173415+0.520246j, -0.173415+0.173415j,
@@ -24,9 +24,9 @@ QAM32=np.array(
          +0.520246-0.520246j, +0.520246-0.173415j, +0.173415-0.520246j, +0.173415-0.173415j,
          -0.866380-0.499386j, -0.984849-0.173415j, -0.499386-0.866380j, -0.173415-0.984849j,
          -0.520246-0.520246j, -0.520246-0.173415j, -0.173415-0.520246j, -0.173415-0.173415j],
-        range(32)), common.CONST_DTYPE)
+        range(32))), common.CONST_DTYPE)
 QAM64=np.array(
-    zip([+1.000000+0.000000j,  0.822878+0.568218j,  0.821137+0.152996j,  0.932897+0.360142j,
+    list(zip([+1.000000+0.000000j,  0.822878+0.568218j,  0.821137+0.152996j,  0.932897+0.360142j,
          +0.000000-1.000000j,  0.822878-0.568218j,  0.821137-0.152996j,  0.932897-0.360142j,
          +0.568218+0.822878j,  0.588429+0.588429j,  0.588429+0.117686j,  0.588429+0.353057j,
          +0.568218-0.822878j,  0.588429-0.588429j,  0.588429-0.117686j,  0.588429-0.353057j,
@@ -42,9 +42,9 @@ QAM64=np.array(
          -0.152996-0.821137j, -0.117686-0.588429j, -0.117686-0.117686j, -0.117686-0.353057j,
          -0.360142+0.932897j, -0.353057+0.588429j, -0.353057+0.117686j, -0.353057+0.353057j,
          -0.360142-0.932897j, -0.353057-0.588429j, -0.353057-0.117686j, -0.353057-0.353057j],
-        range(64)), common.CONST_DTYPE)
+        range(64))), common.CONST_DTYPE)
 QAM256=np.array(
-    zip([+0.959366+0.056433j, +0.959366+0.169300j, +0.846499+0.507899j, +0.959366+0.282166j,
+    list(zip([+0.959366+0.056433j, +0.959366+0.169300j, +0.846499+0.507899j, +0.959366+0.282166j,
          +0.846499+0.056433j, +0.846499+0.169300j, +0.846499+0.395033j, +0.846499+0.282166j,
          +0.959366-0.056433j, +0.959366-0.169300j, +0.846499-0.507899j, +0.959366-0.282166j,
          +0.846499-0.056433j, +0.846499-0.169300j, +0.846499-0.395033j, +0.846499-0.282166j,
@@ -111,7 +111,7 @@ QAM256=np.array(
          -0.282166+0.056433j, -0.282166+0.169300j, -0.282166+0.395033j, -0.282166+0.282166j,
          -0.282166-0.846499j, -0.282166-0.733632j, -0.282166-0.507899j, -0.282166-0.620766j,
          -0.282166-0.056433j, -0.282166-0.169300j, -0.282166-0.395033j, -0.282166-0.282166j],
-        range(256)), common.CONST_DTYPE)
+        range(256))), common.CONST_DTYPE)
 
 ## ---- constellation indices ---------------------------------------------------
 MODE_WALSH  = 0
diff --git a/python/physical_layer/STANAG_4285.py b/python/physical_layer/STANAG_4285.py
index e14cb43..c8bd49d 100644
--- a/python/physical_layer/STANAG_4285.py
+++ b/python/physical_layer/STANAG_4285.py
@@ -2,7 +2,7 @@
 
 import numpy as np
 
-import common
+from . import common
 from digitalhf.digitalhf_swig import viterbi27
 
 class Deinterleaver(object):
@@ -27,9 +27,9 @@ class Deinterleaver(object):
 
 
 ## ---- constellatios -----------------------------------------------------------
-BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
-QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4]), common.CONST_DTYPE)
+BPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1])), common.CONST_DTYPE)
+QPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2])), common.CONST_DTYPE)
+PSK8=np.array(list(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4])), common.CONST_DTYPE)
 
 ## ---- constellation indices ---------------------------------------------------
 MODE_BPSK=0
diff --git a/python/physical_layer/STANAG_4539_AppD.py b/python/physical_layer/STANAG_4539_AppD.py
index 9f4a1aa..c1e3c13 100644
--- a/python/physical_layer/STANAG_4539_AppD.py
+++ b/python/physical_layer/STANAG_4539_AppD.py
@@ -2,7 +2,7 @@
 
 from __future__ import print_function
 import numpy as np
-import common
+from . import common
 
 PREAMBLE = common.n_psk(8, np.array([ 2,6,4,4,6,4,6,2,6,0 #  1
                                      ,2,2,0,4,6,2,2,0,2,6 #  2
@@ -27,9 +27,9 @@ PREAMBLE = common.n_psk(8, np.array([ 2,6,4,4,6,4,6,2,6,0 #  1
                                      ,2,2,4])) ## 203 symbols
 
 ## ---- constellatios -----------------------------------------------------------
-BPSK=np.array(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1]), common.CONST_DTYPE)
-QPSK=np.array(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2]), common.CONST_DTYPE)
-PSK8=np.array(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4]), common.CONST_DTYPE)
+BPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(2)/2), [0,1])), common.CONST_DTYPE)
+QPSK=np.array(list(zip(np.exp(2j*np.pi*np.arange(4)/4), [0,1,3,2])), common.CONST_DTYPE)
+PSK8=np.array(list(zip(np.exp(2j*np.pi*np.arange(8)/8), [0,1,3,2,6,7,5,4])), common.CONST_DTYPE)
 
 ## ---- constellation indices ---------------------------------------------------
 MODE_BPSK=0
diff --git a/python/physical_layer/STANAG_5511.py b/python/physical_layer/STANAG_5511.py
index a0903d6..545c92f 100644
--- a/python/physical_layer/STANAG_5511.py
+++ b/python/physical_layer/STANAG_5511.py
@@ -2,7 +2,7 @@
 
 from __future__ import print_function
 import numpy as np
-import common
+from . import common
 
 from digitalhf.digitalhf_swig import viterbi27