16 files changed, 635 insertions, 444 deletions
diff --git a/dpd/dpd.ini b/dpd/dpd.ini
index 9a76393..26a53c5 100644
--- a/dpd/dpd.ini
+++ b/dpd/dpd.ini
@@ -10,8 +10,8 @@ filelog=1
 filename=/tmp/dabmod.log
 
 [input]
-transport=file
-source=/home/bram/dab/mmbtools-aux/eti/buddard.eti
+transport=tcp
+source=localhost:9200
 
 [modulator]
 gainmode=var
@@ -31,7 +31,7 @@ polycoeffile=dpd/poly.coef
 [output]
 # to prepare a file for the dpd/iq_file_server.py script,
 # use output=file
-output=file
+output=uhd
 
 [fileoutput]
 filename=dpd.iq
@@ -40,7 +40,7 @@ filename=dpd.iq
 device=
 master_clock_rate=32768000
 type=b200
-txgain=15
+txgain=55
 channel=13C
 refclk_source=internal
 pps_source=none
diff --git a/dpd/main.py b/dpd/main.py
index de3453e..084ccd5 100755
--- a/dpd/main.py
+++ b/dpd/main.py
@@ -42,6 +42,7 @@ import numpy as np
 import traceback
 import src.Measure as Measure
 import src.Model as Model
+import src.ExtractStatistic as ExtractStatistic
 import src.Adapt as Adapt
 import src.Agc as Agc
 import src.TX_Agc as TX_Agc
@@ -52,19 +53,19 @@ import argparse
 
 parser = argparse.ArgumentParser(
     description="DPD Computation Engine for ODR-DabMod")
-parser.add_argument('--port', default='50055',
+parser.add_argument('--port', default=50055, type=int,
                     help='port of DPD server to connect to (default: 50055)',
                     required=False)
-parser.add_argument('--rc-port', default='9400',
+parser.add_argument('--rc-port', default=9400, type=int,
                     help='port of ODR-DabMod ZMQ Remote Control to connect to (default: 9400)',
                     required=False)
-parser.add_argument('--samplerate', default='8192000',
+parser.add_argument('--samplerate', default=8192000, type=int,
                     help='Sample rate',
                     required=False)
 parser.add_argument('--coefs', default='poly.coef',
                     help='File with DPD coefficients, which will be read by ODR-DabMod',
                     required=False)
-parser.add_argument('--txgain', default=71,
+parser.add_argument('--txgain', default=73,
                     help='TX Gain',
                     required=False,
                     type=int)
@@ -76,10 +77,10 @@ parser.add_argument('--digital_gain', default=1,
                     help='Digital Gain',
                     required=False,
                     type=float)
-parser.add_argument('--samps', default='81920',
+parser.add_argument('--samps', default='81920', type=int,
                     help='Number of samples to request from ODR-DabMod',
                     required=False)
-parser.add_argument('-i', '--iterations', default='1',
+parser.add_argument('-i', '--iterations', default=1, type=int,
                     help='Number of iterations to run',
                     required=False)
 parser.add_argument('-L', '--lut',
@@ -88,29 +89,29 @@ parser.add_argument('-L', '--lut',
 
 cli_args = parser.parse_args()
 
-port = int(cli_args.port)
-port_rc = int(cli_args.rc_port)
+port = cli_args.port
+port_rc = cli_args.rc_port
 coef_path = cli_args.coefs
 digital_gain = cli_args.digital_gain
 txgain = cli_args.txgain
 rxgain = cli_args.rxgain
-num_req = int(cli_args.samps)
-samplerate = int(cli_args.samplerate)
-num_iter = int(cli_args.iterations)
+num_req = cli_args.samps
+samplerate = cli_args.samplerate
+num_iter = cli_args.iterations
 
 SA = src.Symbol_align.Symbol_align(samplerate)
 MER = src.MER.MER(samplerate)
 c = src.const.const(samplerate)
 
 meas = Measure.Measure(samplerate, port, num_req)
-
+extStat = ExtractStatistic.ExtractStatistic(c, plot=True)
 adapt = Adapt.Adapt(port_rc, coef_path)
 dpddata = adapt.get_predistorter()
 
 if cli_args.lut:
-    model = Model.LutModel(c, SA, MER, plot=True)
+    model = Model.Lut(c, plot=True)
 else:
-    model = Model.PolyModel(c, SA, MER, None, None, plot=True)
+    model = Model.Poly(c, plot=True)
 adapt.set_predistorter(model.get_dpd_data())
 adapt.set_digital_gain(digital_gain)
 adapt.set_txgain(txgain)
@@ -120,7 +121,7 @@ tx_gain = adapt.get_txgain()
 rx_gain = adapt.get_rxgain()
 digital_gain = adapt.get_digital_gain()
 
-dpddata = adapt.get_coefs()
+dpddata = adapt.get_predistorter()
 if dpddata[0] == "poly":
     coefs_am = dpddata[1]
     coefs_pm = dpddata[2]
@@ -148,23 +149,62 @@ tx_agc = TX_Agc.TX_Agc(adapt)
 agc = Agc.Agc(meas, adapt)
 agc.run()
 
-for i in range(num_iter):
+state = "measure"
+i = 0
+while i < num_iter:
     try:
-        txframe_aligned, tx_ts, rxframe_aligned, rx_ts, rx_median = meas.get_samples()
-        logging.debug("tx_ts {}, rx_ts {}".format(tx_ts, rx_ts))
-        assert tx_ts - rx_ts < 1e-5, "Time stamps do not match."
-
-        if tx_agc.adapt_if_necessary(txframe_aligned):
-            continue
-
-        model.train(txframe_aligned, rxframe_aligned)
-        adapt.set_predistorter(model.get_dpd_data())
+        # Measure
+        if state == "measure":
+            txframe_aligned, tx_ts, rxframe_aligned, rx_ts, rx_median = meas.get_samples()
+            tx, rx, phase_diff, n_per_bin = extStat.extract(txframe_aligned, rxframe_aligned)
+            n_use = int(len(n_per_bin) * 0.6)
+            tx = tx[:n_use]
+            rx = rx[:n_use]
+            phase_diff = phase_diff[:n_use]
+            if all(c.ES_n_per_bin == np.array(n_per_bin)[0:n_use]):
+                state = "model"
+            else:
+                state = "measure"
+
+        # Model
+        elif state == "model":
+            dpddata = model_poly.get_dpd_data(tx, rx, phase_diff)
+            del extStat
+            extStat = ExtractStatistic.ExtractStatistic(c, plot=True)
+            state = "adapt"
+
+        # Adapt
+        elif state == "adapt":
+            adapt.set_predistorter(dpddata)
+            state = "report"
+            i += 1
+
+        # Report
+        elif state == "report":
+            try:
+                off = SA.calc_offset(txframe_aligned)
+                tx_mer = MER.calc_mer(txframe_aligned[off:off+c.T_U], debug=True)
+                rx_mer = MER.calc_mer(rxframe_aligned[off:off+c.T_U], debug=True)
+                mse = np.mean(np.abs((txframe_aligned - rxframe_aligned)**2))
+
+                if dpddata[0] == "poly":
+                    coefs_am = dpddata[1]
+                    coefs_pm = dpddata[2]
+                    logging.info("It {}: TX_MER {}, RX_MER {}," \
+                                 " MSE {}, coefs_am {}, coefs_pm {}".
+                                 format(i, tx_mer, rx_mer, mse, coefs_am, coefs_pm))
+                if dpddata[0] == "lut":
+                    scalefactor = dpddata[1]
+                    lut = dpddata[2]
+                    logging.info("It {}: TX_MER {}, RX_MER {}," \
+                                 " MSE {}, LUT scalefactor {}, LUT {}".
+                                 format(i, tx_mer, rx_mer, mse, scalefactor, lut))
+                state = "measure"
+            except:
+                logging.warning("Iteration {}: Report failed.".format(i))
+                logging.warning(traceback.format_exc())
+                state = "measure"
 
-        off = SA.calc_offset(txframe_aligned)
-        tx_mer = MER.calc_mer(txframe_aligned[off:off + c.T_U])
-        rx_mer = MER.calc_mer(rxframe_aligned[off:off + c.T_U], debug=True)
-        logging.info("MER with lag in it. {}: TX {}, RX {}".
-                     format(i, tx_mer, rx_mer))
     except Exception as e:
         logging.warning("Iteration {} failed.".format(i))
         logging.warning(traceback.format_exc())
diff --git a/dpd/poly.coef b/dpd/poly.coef
index 913507a..248d316 100644
--- a/dpd/poly.coef
+++ b/dpd/poly.coef
@@ -1,12 +1,12 @@
 1
 5
 1.0
-0
-0
-0
-0
-0
-0
-0
-0
-0
+0.0
+0.0
+0.0
+0.0
+0.0
+0.0
+0.0
+0.0
+0.0
diff --git a/dpd/src/Agc.py b/dpd/src/Agc.py
index 978b607..b83c91e 100644
--- a/dpd/src/Agc.py
+++ b/dpd/src/Agc.py
@@ -139,7 +139,7 @@ class Agc:
 
         fig.tight_layout()
         fig.savefig(fig_path)
-        fig.clf()
+        plt.close(fig)
 
 
 # The MIT License (MIT)
diff --git a/dpd/src/Dab_Util.py b/dpd/src/Dab_Util.py
index e3dbfe3..37be5db 100644
--- a/dpd/src/Dab_Util.py
+++ b/dpd/src/Dab_Util.py
@@ -49,7 +49,7 @@ class Dab_Util:
             plt.plot(c, label="corr")
             plt.legend()
             plt.savefig(corr_path)
-            plt.clf()
+            plt.close()
 
         return np.argmax(c) - off + 1
 
@@ -118,7 +118,7 @@ class Dab_Util:
 
             fig.tight_layout()
             fig.savefig(fig_path)
-            fig.clf()
+            plt.close(fig)
 
         off_meas = self.lag_upsampling(sig_rx, sig_tx, n_up=1)
         off = int(abs(off_meas))
@@ -161,7 +161,7 @@ class Dab_Util:
 
             fig.tight_layout()
             fig.savefig(fig_path)
-            fig.clf()
+            plt.close(fig)
 
         sig_rx = sa.subsample_align(sig_rx, sig_tx)
 
@@ -185,7 +185,7 @@ class Dab_Util:
 
             fig.tight_layout()
             fig.savefig(fig_path)
-            fig.clf()
+            plt.close(fig)
 
         sig_rx = pa.phase_align(sig_rx, sig_tx)
 
@@ -209,7 +209,7 @@ class Dab_Util:
 
             fig.tight_layout()
             fig.savefig(fig_path)
-            fig.clf()
+            plt.close(fig)
 
         logging.debug("Sig1_cut: %d %s, Sig2_cut: %d %s, off: %d" % (len(sig_tx), sig_tx.dtype, len(sig_rx), sig_rx.dtype, off))
         return sig_tx, sig_rx
diff --git a/dpd/src/ExtractStatistic.py b/dpd/src/ExtractStatistic.py
new file mode 100644
index 0000000..897ec0a
--- /dev/null
+++ b/dpd/src/ExtractStatistic.py
@@ -0,0 +1,201 @@
+# -*- coding: utf-8 -*-
+#
+# DPD Calculation Engine,
+# Extract statistic from data to use in Model
+#
+# http://www.opendigitalradio.org
+# Licence: The MIT License, see notice at the end of this file
+
+import numpy as np
+import pickle
+import matplotlib.pyplot as plt
+
+import datetime
+import os
+import logging
+
+logging_path = os.path.dirname(logging.getLoggerClass().root.handlers[0].baseFilename)
+
+
+def _check_input_extract(tx_dpd, rx_received):
+    # Check data type
+    assert tx_dpd[0].dtype == np.complex64, \
+        "tx_dpd is not complex64 but {}".format(tx_dpd[0].dtype)
+    assert rx_received[0].dtype == np.complex64, \
+        "rx_received is not complex64 but {}".format(rx_received[0].dtype)
+    # Check if signals have same normalization
+    normalization_error = np.abs(np.median(np.abs(tx_dpd)) -
+                                 np.median(np.abs(rx_received))) / (
+                              np.median(np.abs(tx_dpd)) + np.median(np.abs(rx_received)))
+    assert normalization_error < 0.01, "Non normalized signals"
+
+
+class ExtractStatistic:
+    """Calculate a low variance RX value for equally spaced tx values
+    of a predefined range"""
+
+    def __init__(self,
+                 c,
+                 plot=False):
+        self.c = c
+
+        self.tx_boundaries = np.linspace(c.ES_start, c.ES_end, c.ES_n_bins + 1)
+        self.n_per_bin = c.ES_n_per_bin
+
+        self.rx_values_lists = []
+        for i in range(c.ES_n_bins):
+            self.rx_values_lists.append([])
+
+        self.tx_values_lists = []
+        for i in range(c.ES_n_bins):
+            self.tx_values_lists.append([])
+
+        self.tx_values = self._tx_value_per_bin()
+
+        self.rx_values = []
+        for i in range(c.ES_n_bins):
+            self.rx_values.append(None)
+
+        self.plot = plot
+
+    def _plot_and_log(self):
+        if logging.getLogger().getEffectiveLevel() == logging.DEBUG and self.plot:
+            phase_diffs_values_lists = self._phase_diff_list_per_bin()
+            phase_diffs_values = self._phase_diff_value_per_bin(phase_diffs_values_lists)
+
+            dt = datetime.datetime.now().isoformat()
+            fig_path = logging_path + "/" + dt + "_ExtractStatistic.png"
+            sub_rows = 3
+            sub_cols = 1
+            fig = plt.figure(figsize=(sub_cols * 6, sub_rows / 2. * 6))
+            i_sub = 0
+
+            i_sub += 1
+            ax = plt.subplot(sub_rows, sub_cols, i_sub)
+            ax.plot(self.tx_values, self.rx_values,
+                    label="Estimated Values",
+                    color="red")
+            for i, tx_value in enumerate(self.tx_values):
+                rx_values = self.rx_values_lists[i]
+                ax.scatter(np.ones(len(rx_values)) * tx_value,
+                           np.abs(rx_values),
+                           s=0.1,
+                           color="black")
+            ax.set_title("Extracted Statistic")
+            ax.set_xlabel("TX Amplitude")
+            ax.set_ylabel("RX Amplitude")
+            ax.set_ylim(0, 0.8)
+            ax.set_xlim(0, 1.1)
+            ax.legend(loc=4)
+
+            i_sub += 1
+            ax = plt.subplot(sub_rows, sub_cols, i_sub)
+            ax.plot(self.tx_values, np.rad2deg(phase_diffs_values),
+                    label="Estimated Values",
+                    color="red")
+            for i, tx_value in enumerate(self.tx_values):
+                phase_diff = phase_diffs_values_lists[i]
+                ax.scatter(np.ones(len(phase_diff)) * tx_value,
+                           np.rad2deg(phase_diff),
+                           s=0.1,
+                           color="black")
+            ax.set_xlabel("TX Amplitude")
+            ax.set_ylabel("Phase Difference")
+            ax.set_ylim(-60,60)
+            ax.set_xlim(0, 1.1)
+            ax.legend(loc=4)
+
+            num = []
+            for i, tx_value in enumerate(self.tx_values):
+                rx_values = self.rx_values_lists[i]
+                num.append(len(rx_values))
+            i_sub += 1
+            ax = plt.subplot(sub_rows, sub_cols, i_sub)
+            ax.plot(num)
+            ax.set_xlabel("TX Amplitude")
+            ax.set_ylabel("Number of Samples")
+            ax.set_ylim(0, self.n_per_bin * 1.2)
+
+            fig.tight_layout()
+            fig.savefig(fig_path)
+            plt.close(fig)
+
+            pickle.dump(self.rx_values_lists, open("/tmp/rx_values", "wb"))
+            pickle.dump(self.tx_values, open("/tmp/tx_values", "wb"))
+
+    def _rx_value_per_bin(self):
+        rx_values = []
+        for values in self.rx_values_lists:
+            rx_values.append(np.mean(np.abs(values)))
+        return rx_values
+
+    def _tx_value_per_bin(self):
+        tx_values = []
+        for start, end in zip(self.tx_boundaries, self.tx_boundaries[1:]):
+            tx_values.append(np.mean((start, end)))
+        return tx_values
+
+    def _phase_diff_list_per_bin(self):
+        phase_values_lists = []
+        for tx_list, rx_list in zip(self.tx_values_lists, self.rx_values_lists):
+            phase_diffs = []
+            for tx, rx in zip(tx_list, rx_list):
+                phase_diffs.append(np.angle(rx * tx.conjugate()))
+            phase_values_lists.append(phase_diffs)
+        return phase_values_lists
+
+    def _phase_diff_value_per_bin(self, phase_diffs_values_lists):
+        phase_list = []
+        for values in phase_diffs_values_lists:
+            phase_list.append(np.mean(values))
+        return phase_list
+
+    def extract(self, tx_dpd, rx):
+        _check_input_extract(tx_dpd, rx)
+
+        tx_abs = np.abs(tx_dpd)
+        for i, (tx_start, tx_end) in enumerate(zip(self.tx_boundaries, self.tx_boundaries[1:])):
+            mask = (tx_abs > tx_start) & (tx_abs < tx_end)
+            n_add = max(0, self.n_per_bin - len(self.rx_values_lists[i]))
+            self.rx_values_lists[i] += \
+                list(rx[mask][:n_add])
+            self.tx_values_lists[i] += \
+                list(tx_dpd[mask][:n_add])
+
+        self.rx_values = self._rx_value_per_bin()
+        self.tx_values = self._tx_value_per_bin()
+
+        self._plot_and_log()
+
+        n_per_bin = [len(values) for values in self.rx_values_lists]
+
+        # TODO cleanup
+        phase_diffs_values_lists = self._phase_diff_list_per_bin()
+        phase_diffs_values = self._phase_diff_value_per_bin(phase_diffs_values_lists)
+
+        return np.array(self.tx_values,  dtype=np.float32), \
+               np.array(self.rx_values, dtype=np.float32), \
+               np.array(phase_diffs_values, dtype=np.float32), \
+               n_per_bin
+
+# The MIT License (MIT)
+#
+# Copyright (c) 2017 Andreas Steger
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
diff --git a/dpd/src/MER.py b/dpd/src/MER.py
index 00fcc23..4f2918e 100644
--- a/dpd/src/MER.py
+++ b/dpd/src/MER.py
@@ -106,7 +106,7 @@ class MER:
             plt.tight_layout()
             plt.savefig(fig_path)
             plt.show()
-            plt.clf()
+            plt.close()
 
         MER_res = 20 * np.log10(np.mean([10 ** (MER / 20) for MER in MERs]))
         return MER_res
diff --git a/dpd/src/Measure.py b/dpd/src/Measure.py
index 2450b8a..7a9246c 100644
--- a/dpd/src/Measure.py
+++ b/dpd/src/Measure.py
@@ -104,10 +104,6 @@ class Measure:
 
         txframe, tx_ts, rxframe, rx_ts = self.receive_tcp()
 
-        if logging.getLogger().getEffectiveLevel() == logging.DEBUG:
-            dt = datetime.datetime.now().isoformat()
-            txframe.tofile(logging_path + "/txframe_" + dt + ".iq")
-
         # Normalize received signal with sent signal
         rx_median = np.median(np.abs(rxframe))
         rxframe = rxframe / rx_median * np.median(np.abs(txframe))
diff --git a/dpd/src/Model.py b/dpd/src/Model.py
index a23f0ce..7ce6171 100644
--- a/dpd/src/Model.py
+++ b/dpd/src/Model.py
@@ -1,388 +1,3 @@
 # -*- coding: utf-8 -*-
-#
-# DPD Calculation Engine, model implementation.
-#
-# http://www.opendigitalradio.org
-# Licence: The MIT License, see notice at the end of this file
-
-import datetime
-import os
-import logging
-
-logging_path = os.path.dirname(logging.getLoggerClass().root.handlers[0].baseFilename)
-
-import numpy as np
-import matplotlib.pyplot as plt
-from sklearn import linear_model
-
-class PolyModel:
-    """Calculates new coefficients using the measurement and the old
-    coefficients"""
-
-    def __init__(self,
-                 c,
-                 SA,
-                 MER,
-                 coefs_am,
-                 coefs_pm,
-                 learning_rate_am=1.,
-                 learning_rate_pm=1.,
-                 plot=False):
-        logging.debug("Initialising Poly Model")
-        self.c = c
-        self.SA = SA
-        self.MER = MER
-
-        self.learning_rate_am = learning_rate_am
-        self.learning_rate_pm = learning_rate_pm
-
-        if coefs_am is None:
-            self.coefs_am = [1.0, 0, 0, 0, 0]
-        else:
-            self.coefs_am = coefs_am
-        self.coefs_am_history = [coefs_am, ]
-        self.mses_am = []
-        self.errs_am = []
-
-        self.tx_mers = []
-        self.rx_mers = []
-
-        if coefs_pm is None:
-            self.coefs_pm = [0, 0, 0, 0, 0]
-        else:
-            self.coefs_pm = coefs_pm
-        self.coefs_pm_history = [coefs_pm, ]
-        self.errs_pm = []
-
-        self.plot = plot
-
-    def train(self, tx_dpd, rx_received):
-        """Give new training data to the model"""
-        # Check data type
-        assert tx_dpd[0].dtype == np.complex64, \
-            "tx_dpd is not complex64 but {}".format(tx_dpd[0].dtype)
-        assert rx_received[0].dtype == np.complex64, \
-            "rx_received is not complex64 but {}".format(rx_received[0].dtype)
-        # Check if signals have same normalization
-        normalization_error = np.abs(np.median(np.abs(tx_dpd)) -
-                                     np.median(np.abs(rx_received))) / (
-                                  np.median(np.abs(tx_dpd)) + np.median(np.abs(rx_received)))
-        assert normalization_error < 0.01, "Non normalized signals"
-
-        tx_choice, rx_choice = self._sample_uniformly(tx_dpd, rx_received)
-        new_coefs_am = self._next_am_coefficent(tx_choice, rx_choice)
-        new_coefs_pm, phase_diff_choice = self._next_pm_coefficent(tx_choice, rx_choice)
-
-        logging.debug('txframe: min {:.2f}, max {:.2f}, ' \
-                      'median {:.2f}; rxframe: min {:.2f}, max {:.2f}, ' \
-                      'median {:.2f}; new coefs_am {};' \
-                      'new_coefs_pm {}'.format(
-            np.min(np.abs(tx_dpd)),
-            np.max(np.abs(tx_dpd)),
-            np.median(np.abs(tx_dpd)),
-            np.min(np.abs(rx_choice)),
-            np.max(np.abs(rx_choice)),
-            np.median(np.abs(rx_choice)),
-            new_coefs_am,
-            new_coefs_pm))
-
-        if logging.getLogger().getEffectiveLevel() == logging.DEBUG and self.plot:
-            off = self.SA.calc_offset(tx_dpd)
-            tx_mer = self.MER.calc_mer(tx_dpd[off:off + self.c.T_U])
-            rx_mer = self.MER.calc_mer(rx_received[off:off + self.c.T_U], debug=True)
-            self.tx_mers.append(tx_mer)
-            self.rx_mers.append(rx_mer)
-
-        if logging.getLogger().getEffectiveLevel() == logging.DEBUG and self.plot:
-            dt = datetime.datetime.now().isoformat()
-            fig_path = logging_path + "/" + dt + "_Model.svg"
-
-            fig = plt.figure(figsize=(2 * 6, 2 * 6))
-
-            i_sub = 1
-
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            ax.plot(np.abs(tx_dpd[:128]),
-                    label="TX sent",
-                    linestyle=":")
-            ax.plot(np.abs(rx_received[:128]),
-                    label="RX received",
-                    color="red")
-            ax.set_title("Synchronized Signals of Iteration {}"
-                         .format(len(self.coefs_am_history)))
-            ax.set_xlabel("Samples")
-            ax.set_ylabel("Amplitude")
-            ax.text(0, 0, "TX (max {:01.3f}, mean {:01.3f}, " \
-                          "median {:01.3f})".format(
-                np.max(np.abs(tx_dpd)),
-                np.mean(np.abs(tx_dpd)),
-                np.median(np.abs(tx_dpd))
-            ), size=8)
-            ax.legend(loc=4)
-
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            ccdf_min, ccdf_max = 0, 1
-            tx_hist, ccdf_edges = np.histogram(np.abs(tx_dpd),
-                                               bins=60,
-                                               range=(ccdf_min, ccdf_max))
-            tx_hist_normalized = tx_hist.astype(float) / np.sum(tx_hist)
-            ccdf = 1.0 - np.cumsum(tx_hist_normalized)
-            ax.semilogy(ccdf_edges[:-1], ccdf, label="CCDF")
-            ax.semilogy(ccdf_edges[:-1],
-                        tx_hist_normalized,
-                        label="Histogram",
-                        drawstyle='steps')
-            ax.legend(loc=4)
-            ax.set_ylim(1e-5, 2)
-            ax.set_title("Complementary Cumulative Distribution Function")
-            ax.set_xlabel("TX Amplitude")
-            ax.set_ylabel("Ratio of Samples larger than x")
-
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            ax.semilogy(np.array(self.mses_am) + 1e-10, label="log(MSE)")
-            ax.semilogy(np.array(self.errs_am) + 1e-10, label="log(ERR)")
-            ax.legend(loc=4)
-            ax.set_title("MSE History")
-            ax.set_xlabel("Iterations")
-            ax.set_ylabel("MSE")
-
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            ax.plot(self.tx_mers, label="TX MER")
-            ax.plot(self.rx_mers, label="RX MER")
-            ax.legend(loc=4)
-            ax.set_title("MER History")
-            ax.set_xlabel("Iterations")
-            ax.set_ylabel("MER")
-
-            ax = plt.subplot(4, 2, i_sub)
-            rx_range = np.linspace(0, 1, num=100, dtype=np.complex64)
-            rx_range_dpd = self._dpd_amplitude(rx_range)[0]
-            rx_range_dpd_new = self._dpd_amplitude(rx_range, new_coefs_am)[0]
-            i_sub += 1
-            ax.scatter(
-                np.abs(tx_choice),
-                np.abs(rx_choice),
-                s=0.1)
-            ax.plot(rx_range_dpd / self.coefs_am[0], rx_range, linewidth=0.25, label="current")
-            ax.plot(rx_range_dpd_new / self.coefs_am[0], rx_range, linewidth=0.25, label="next")
-            ax.set_ylim(0, 1)
-            ax.set_xlim(0, 1)
-            ax.legend()
-            ax.set_title("Amplifier Characteristic")
-            ax.set_xlabel("TX Amplitude")
-            ax.set_ylabel("RX Amplitude")
-
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            coefs_am_history = np.array(self.coefs_am_history)
-            for idx, coef_hist in enumerate(coefs_am_history.T):
-                ax.plot(coef_hist,
-                        label="Coef {}".format(idx),
-                        linewidth=0.5)
-            ax.legend(loc=4)
-            ax.set_title("AM/AM Coefficient History")
-            ax.set_xlabel("Iterations")
-            ax.set_ylabel("Coefficient Value")
-
-            phase_range = np.linspace(0, 1, num=100, dtype=np.complex64)
-            phase_range_dpd = self._dpd_phase(phase_range)[0]
-            phase_range_dpd_new = self._dpd_phase(phase_range,
-                                                 coefs=new_coefs_pm)[0]
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            ax.scatter(
-                np.abs(tx_choice),
-                np.rad2deg(phase_diff_choice),
-                s=0.1)
-            ax.plot(
-                np.abs(phase_range),
-                np.rad2deg(phase_range_dpd),
-                linewidth=0.25,
-                label="current")
-            ax.plot(
-                np.abs(phase_range),
-                np.rad2deg(phase_range_dpd_new),
-                linewidth=0.25,
-                label="next")
-            ax.set_ylim(-60, 60)
-            ax.set_xlim(0, 1)
-            ax.legend()
-            ax.set_title("Amplifier Characteristic")
-            ax.set_xlabel("TX Amplitude")
-            ax.set_ylabel("Phase Difference")
-
-            ax = plt.subplot(4, 2, i_sub)
-            i_sub += 1
-            coefs_pm_history = np.array(self.coefs_pm_history)
-            for idx, coef_phase_hist in enumerate(coefs_pm_history.T):
-                ax.plot(coef_phase_hist,
-                        label="Coef {}".format(idx),
-                        linewidth=0.5)
-            ax.legend(loc=4)
-            ax.set_title("AM/PM Coefficient History")
-            ax.set_xlabel("Iterations")
-            ax.set_ylabel("Coefficient Value")
-
-            fig.tight_layout()
-            fig.savefig(fig_path)
-            fig.clf()
-
-        self.coefs_am = new_coefs_am
-        self.coefs_am_history.append(self.coefs_am)
-        self.coefs_pm = new_coefs_pm
-        self.coefs_pm_history.append(self.coefs_pm)
-
-    def get_dpd_data(self):
-        return "poly", self.coefs_am, self.coefs_pm
-
-    def _sample_uniformly(self, tx_dpd, rx_received, n_bins=5):
-        """This function returns tx and rx samples in a way
-        that the tx amplitudes have an approximate uniform 
-        distribution with respect to the tx_dpd amplitudes"""
-        mask = np.logical_and((np.abs(tx_dpd) > 0.01), (np.abs(rx_received) > 0.01))
-        tx_dpd = tx_dpd[mask]
-        rx_received = rx_received[mask]
-
-        txframe_aligned_abs = np.abs(tx_dpd)
-        ccdf_min = 0
-        ccdf_max = np.max(txframe_aligned_abs)
-        tx_hist, ccdf_edges = np.histogram(txframe_aligned_abs,
-                                           bins=n_bins,
-                                           range=(ccdf_min, ccdf_max))
-        n_choise = np.min(tx_hist)
-        tx_choice = np.zeros(n_choise * n_bins, dtype=np.complex64)
-        rx_choice = np.zeros(n_choise * n_bins, dtype=np.complex64)
-
-        for idx, bin in enumerate(tx_hist):
-            indices = np.where((txframe_aligned_abs >= ccdf_edges[idx]) &
-                               (txframe_aligned_abs <= ccdf_edges[idx + 1]))[0]
-            indices_choise = np.random.choice(indices,
-                                              n_choise,
-                                              replace=False)
-            rx_choice[idx * n_choise:(idx + 1) * n_choise] = \
-                rx_received[indices_choise]
-            tx_choice[idx * n_choise:(idx + 1) * n_choise] = \
-                tx_dpd[indices_choise]
-
-        assert isinstance(rx_choice[0], np.complex64), \
-            "rx_choice is not complex64 but {}".format(rx_choice[0].dtype)
-        assert isinstance(tx_choice[0], np.complex64), \
-            "tx_choice is not complex64 but {}".format(tx_choice[0].dtype)
-
-        return tx_choice, rx_choice
-
-    def _dpd_amplitude(self, sig, coefs=None):
-        if coefs is None:
-            coefs = self.coefs_am
-        assert isinstance(sig[0], np.complex64), "Sig is not complex64 but {}".format(sig[0].dtype)
-        sig_abs = np.abs(sig)
-        A_sig = np.vstack([np.ones(sig_abs.shape),
-                           sig_abs ** 1,
-                           sig_abs ** 2,
-                           sig_abs ** 3,
-                           sig_abs ** 4,
-                           ]).T
-        sig_dpd = sig * np.sum(A_sig * coefs, axis=1)
-        return sig_dpd, A_sig
-
-    def _dpd_phase(self, sig, coefs=None):
-        if coefs is None:
-            coefs = self.coefs_pm
-        assert isinstance(sig[0], np.complex64), "Sig is not complex64 but {}".format(sig[0].dtype)
-        sig_abs = np.abs(sig)
-        A_phase = np.vstack([np.ones(sig_abs.shape),
-                             sig_abs ** 1,
-                             sig_abs ** 2,
-                             sig_abs ** 3,
-                             sig_abs ** 4,
-                             ]).T
-        phase_diff_est = np.sum(A_phase * coefs, axis=1)
-        return phase_diff_est, A_phase
-
-    def _next_am_coefficent(self, tx_choice, rx_choice):
-        """Calculate new coefficients for AM/AM correction"""
-        rx_dpd, rx_A = self._dpd_amplitude(rx_choice)
-        rx_dpd = rx_dpd * (
-            np.median(np.abs(tx_choice)) /
-            np.median(np.abs(rx_dpd)))
-        err = np.abs(rx_dpd) - np.abs(tx_choice)
-        mse = np.mean(np.abs((rx_dpd - tx_choice) ** 2))
-        self.mses_am.append(mse)
-        self.errs_am.append(np.mean(err**2))
-
-        reg = linear_model.Ridge(alpha=0.00001)
-        reg.fit(rx_A, err)
-        a_delta = reg.coef_
-        new_coefs_am = self.coefs_am - self.learning_rate_am * a_delta
-        new_coefs_am = new_coefs_am * (self.coefs_am[0] / new_coefs_am[0])
-        return new_coefs_am
-
-    def _next_pm_coefficent(self, tx_choice, rx_choice):
-        """Calculate new coefficients for AM/PM correction
-        Assuming deviations smaller than pi/2"""
-        phase_diff_choice = np.angle(
-            (rx_choice * tx_choice.conjugate()) /
-            (np.abs(rx_choice) * np.abs(tx_choice))
-        )
-        plt.hist(phase_diff_choice)
-        plt.savefig('/tmp/hist_' + str(np.random.randint(0,1000)) + '.svg')
-        plt.clf()
-        phase_diff_est, phase_A = self._dpd_phase(rx_choice)
-        err_phase = phase_diff_est - phase_diff_choice
-        self.errs_pm.append(np.mean(np.abs(err_phase ** 2)))
-
-        reg = linear_model.Ridge(alpha=0.00001)
-        reg.fit(phase_A, err_phase)
-        p_delta = reg.coef_
-        new_coefs_pm = self.coefs_pm - self.learning_rate_pm * p_delta
-
-        return new_coefs_pm, phase_diff_choice
-
-class LutModel:
-    """Implements a model that calculates lookup table coefficients"""
-
-    def __init__(self,
-                 c,
-                 SA,
-                 MER,
-                 learning_rate=1.,
-                 plot=False):
-        logging.debug("Initialising LUT Model")
-        self.c = c
-        self.SA = SA
-        self.MER = MER
-        self.learning_rate = learning_rate
-        self.plot = plot
-
-    def train(self, tx_dpd, rx_received):
-        pass
-
-    def get_dpd_data(self):
-        return ("lut", np.ones(32, dtype=np.complex64))
-
-# The MIT License (MIT)
-#
-# Copyright (c) 2017 Andreas Steger
-# Copyright (c) 2017 Matthias P. Braendli
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
+from src.Model_Poly import Poly
+from src.Model_Lut import Lut
diff --git a/dpd/src/Model_AM.py b/dpd/src/Model_AM.py
new file mode 100644
index 0000000..ef6cc6c
--- /dev/null
+++ b/dpd/src/Model_AM.py
@@ -0,0 +1,115 @@
+# -*- coding: utf-8 -*-
+#
+# DPD Calculation Engine, model implementation for Amplitude and not Phase
+#
+# http://www.opendigitalradio.org
+# Licence: The MIT License, see notice at the end of this file
+
+import datetime
+import os
+import logging
+
+logging_path = os.path.dirname(logging.getLoggerClass().root.handlers[0].baseFilename)
+
+import numpy as np
+import matplotlib.pyplot as plt
+from sklearn import linear_model
+
+
+def check_input_get_next_coefs(tx_dpd, rx_received):
+    is_float32 = lambda x: (isinstance(x, np.ndarray) and
+                        x.dtype == np.float32 and
+                        x.flags.contiguous)
+    assert is_float32(tx_dpd), \
+           "tx_dpd is not float32 but {}".format(tx_dpd[0].dtype)
+    assert is_float32(rx_received), \
+            "rx_received is not float32 but {}".format(tx_dpd[0].dtype)
+
+
+class Model_AM:
+    """Calculates new coefficients using the measurement and the previous
+    coefficients"""
+
+    def __init__(self,
+                 c,
+                 learning_rate_am=0.1,
+                 plot=False):
+        self.c = c
+
+        self.learning_rate_am = learning_rate_am
+        self.plot = plot
+
+    def _plot(self, tx_dpd, rx_received, coefs_am, coefs_am_new):
+        if logging.getLogger().getEffectiveLevel() == logging.DEBUG and self.plot:
+            tx_range, rx_est = self.calc_line(coefs_am, 0, 0.6)
+            tx_range_new, rx_est_new = self.calc_line(coefs_am_new, 0, 0.6)
+
+            dt = datetime.datetime.now().isoformat()
+            fig_path = logging_path + "/" + dt + "_Model_AM.svg"
+            sub_rows = 1
+            sub_cols = 1
+            fig = plt.figure(figsize=(sub_cols * 6, sub_rows / 2. * 6))
+            i_sub = 0
+
+            i_sub += 1
+            ax = plt.subplot(sub_rows, sub_cols, i_sub)
+            ax.plot(tx_range, rx_est,
+                    label="Estimated TX",
+                    alpha=0.3,
+                    color="gray")
+            ax.plot(tx_range_new, rx_est_new,
+                    label="New Estimated TX",
+                    color="red")
+            ax.scatter(tx_dpd, rx_received,
+                       label="Binned Data",
+                       color="blue",
+                       s=0.1)
+            ax.set_title("Model_AM")
+            ax.set_xlabel("TX Amplitude")
+            ax.set_ylabel("RX Amplitude")
+            ax.legend(loc=4)
+
+            fig.tight_layout()
+            fig.savefig(fig_path)
+            plt.close(fig)
+
+    def poly(self, sig):
+        return np.array([sig ** i for i in range(1, 6)]).T
+
+    def fit_poly(self, tx_abs, rx_abs):
+        return np.linalg.lstsq(self.poly(rx_abs), tx_abs)[0]
+
+    def calc_line(self, coefs, min_amp, max_amp):
+        rx_range = np.linspace(min_amp, max_amp)
+        tx_est = np.sum(self.poly(rx_range) * coefs, axis=1)
+        return tx_est, rx_range
+
+    def get_next_coefs(self, tx_dpd, rx_received, coefs_am):
+        check_input_get_next_coefs(tx_dpd, rx_received)
+
+        coefs_am_new = self.fit_poly(tx_dpd, rx_received)
+        self._plot(tx_dpd, rx_received, coefs_am, coefs_am_new)
+
+        return coefs_am_new
+
+# The MIT License (MIT)
+#
+# Copyright (c) 2017 Andreas Steger
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
diff --git a/dpd/src/Model_PM.py b/dpd/src/Model_PM.py
new file mode 100644
index 0000000..6639382
--- /dev/null
+++ b/dpd/src/Model_PM.py
@@ -0,0 +1,118 @@
+# -*- coding: utf-8 -*-
+#
+# DPD Calculation Engine, model implementation for Amplitude and not Phase
+#
+# http://www.opendigitalradio.org
+# Licence: The MIT License, see notice at the end of this file
+
+import datetime
+import os
+import logging
+
+logging_path = os.path.dirname(logging.getLoggerClass().root.handlers[0].baseFilename)
+
+import numpy as np
+import matplotlib.pyplot as plt
+from sklearn import linear_model
+
+
+def check_input_get_next_coefs(tx_dpd, phase_diff):
+    is_float32 = lambda x: (isinstance(x, np.ndarray) and
+                        x.dtype == np.float32 and
+                        x.flags.contiguous)
+    assert is_float32(tx_dpd), \
+           "tx_dpd is not float32 but {}".format(tx_dpd[0].dtype)
+    assert is_float32(phase_diff), \
+            "phase_diff is not float32 but {}".format(tx_dpd[0].dtype)
+    assert tx_dpd.shape == phase_diff.shape, \
+        "tx_dpd.shape {}, phase_diff.shape {}".format(
+        tx_dpd.shape, phase_diff.shape)
+
+
+class Model_PM:
+    """Calculates new coefficients using the measurement and the previous
+    coefficients"""
+
+    def __init__(self,
+                 c,
+                 learning_rate_pm=0.1,
+                 plot=False):
+        self.c = c
+
+        self.learning_rate_pm = learning_rate_pm
+        self.plot = plot
+
+    def _plot(self, tx_dpd, phase_diff, coefs_pm, coefs_pm_new):
+        if logging.getLogger().getEffectiveLevel() == logging.DEBUG and self.plot:
+            tx_range, phase_diff_est = self.calc_line(coefs_pm, 0, 0.6)
+            tx_range_new, phase_diff_est_new = self.calc_line(coefs_pm_new, 0, 0.6)
+
+            dt = datetime.datetime.now().isoformat()
+            fig_path = logging_path + "/" + dt + "_Model_PM.svg"
+            sub_rows = 1
+            sub_cols = 1
+            fig = plt.figure(figsize=(sub_cols * 6, sub_rows / 2. * 6))
+            i_sub = 0
+
+            i_sub += 1
+            ax = plt.subplot(sub_rows, sub_cols, i_sub)
+            ax.plot(tx_range, phase_diff_est,
+                    label="Estimated Phase Diff",
+                    alpha=0.3,
+                    color="gray")
+            ax.plot(tx_range_new, phase_diff_est_new,
+                    label="New Estimated Phase Diff",
+                    color="red")
+            ax.scatter(tx_dpd, phase_diff,
+                       label="Binned Data",
+                       color="blue",
+                       s=0.1)
+            ax.set_title("Model_PM")
+            ax.set_xlabel("TX Amplitude")
+            ax.set_ylabel("Phase DIff")
+            ax.legend(loc=4)
+
+            fig.tight_layout()
+            fig.savefig(fig_path)
+            plt.close(fig)
+
+    def poly(self, sig):
+        return np.array([sig ** i for i in range(0, 5)]).T
+
+    def fit_poly(self, tx_abs, phase_diff):
+        return np.linalg.lstsq(self.poly(tx_abs), phase_diff)[0]
+
+    def calc_line(self, coefs, min_amp, max_amp):
+        tx_range = np.linspace(min_amp, max_amp)
+        phase_diff = np.sum(self.poly(tx_range) * coefs, axis=1)
+        return tx_range, phase_diff
+
+    def get_next_coefs(self, tx_dpd, phase_diff, coefs_pm):
+        check_input_get_next_coefs(tx_dpd, phase_diff)
+
+        coefs_pm_new = self.fit_poly(tx_dpd, phase_diff)
+        self._plot(tx_dpd, phase_diff, coefs_pm, coefs_pm_new)
+
+        return coefs_pm_new
+
+# The MIT License (MIT)
+#
+# Copyright (c) 2017 Andreas Steger
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
diff --git a/dpd/src/Model_Poly.py b/dpd/src/Model_Poly.py
new file mode 100644
index 0000000..f6c024c
--- /dev/null
+++ b/dpd/src/Model_Poly.py
@@ -0,0 +1,99 @@
+# -*- coding: utf-8 -*-
+#
+# DPD Calculation Engine, model implementation using polynomial
+#
+# http://www.opendigitalradio.org
+# Licence: The MIT License, see notice at the end of this file
+
+import datetime
+import os
+import logging
+
+logging_path = os.path.dirname(logging.getLoggerClass().root.handlers[0].baseFilename)
+
+import numpy as np
+import matplotlib.pyplot as plt
+from sklearn import linear_model
+
+import src.Model_AM as Model_AM
+import src.Model_PM as Model_PM
+
+
+def assert_np_float32(x):
+    assert isinstance(x, np.ndarray)
+    assert x.dtype == np.float32
+    assert x.flags.contiguous
+
+def _check_input_get_next_coefs(tx_abs, rx_abs, phase_diff):
+    assert_np_float32(tx_abs)
+    assert_np_float32(rx_abs)
+    assert_np_float32(phase_diff)
+
+    assert tx_abs.shape == rx_abs.shape, \
+        "tx_abs.shape {}, rx_abs.shape {}".format(
+            tx_abs.shape, rx_abs.shape)
+    assert tx_abs.shape == phase_diff.shape, \
+        "tx_abs.shape {}, phase_diff.shape {}".format(
+            tx_abs.shape, phase_diff.shape)
+
+
+class Poly:
+    """Calculates new coefficients using the measurement and the previous
+    coefficients"""
+
+    def __init__(self,
+                 c,
+                 learning_rate_am=1.0,
+                 learning_rate_pm=1.0,
+                 plot=False):
+        self.c = c
+
+        self.learning_rate_am = learning_rate_am
+        self.learning_rate_pm = learning_rate_pm
+
+        self.reset_coefs()
+
+        self.model_am = Model_AM.Model_AM(c, plot=True)
+        self.model_pm = Model_PM.Model_PM(c, plot=True)
+
+        self.plot = plot
+
+    def reset_coefs(self):
+        self.coefs_am = np.zeros(5, dtype=np.float32)
+        self.coefs_am[0] = 1
+        self.coefs_pm = np.zeros(5, dtype=np.float32)
+        return self.coefs_am, self.coefs_pm
+
+    def train(self, tx_abs, rx_abs, phase_diff):
+        _check_input_get_next_coefs(tx_abs, rx_abs, phase_diff)
+
+        coefs_am_new = self.model_am.get_next_coefs(tx_abs, rx_abs, self.coefs_am)
+        coefs_pm_new = self.model_pm.get_next_coefs(tx_abs, phase_diff, self.coefs_pm)
+
+        self.coefs_am = self.coefs_am + (coefs_am_new - self.coefs_am) * self.learning_rate_am
+        self.coefs_pm = self.coefs_pm + (coefs_pm_new - self.coefs_pm) * self.learning_rate_pm
+
+    def get_dpd_data(self):
+        return "poly", self.coefs_am, self.coefs_pm
+
+# The MIT License (MIT)
+#
+# Copyright (c) 2017 Andreas Steger
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
diff --git a/dpd/src/Symbol_align.py b/dpd/src/Symbol_align.py
index 05a9049..6c814a8 100644
--- a/dpd/src/Symbol_align.py
+++ b/dpd/src/Symbol_align.py
@@ -147,7 +147,8 @@ class Symbol_align:
         delta_sample_int = np.round(delta_sample).astype(int)
         error = np.abs(delta_sample_int - delta_sample)
         if error > 0.1:
-            raise RuntimeError("Could not calculate sample offset")
+            raise RuntimeError("Could not calculate " \
+                               "sample offset. Error {}".format(error))
         return delta_sample_int
 
     def calc_offset(self, tx):
diff --git a/dpd/src/const.py b/dpd/src/const.py
index 1011c6c..75ff819 100644
--- a/dpd/src/const.py
+++ b/dpd/src/const.py
@@ -36,3 +36,9 @@ class const:
         # frequency per bin = 1kHz
         # phase difference per sample offset = delta_t * 2 * pi * delta_freq
         self.phase_offset_per_sample = 1. / sample_rate * 2 * np.pi * 1000
+
+        # Constants for ExtractStatistic
+        self.ES_start = 0.0
+        self.ES_end = 1.0
+        self.ES_n_bins = 64
+        self.ES_n_per_bin = 256
diff --git a/dpd/src/phase_align.py b/dpd/src/phase_align.py
index 7f82392..7317d70 100644
--- a/dpd/src/phase_align.py
+++ b/dpd/src/phase_align.py
@@ -75,7 +75,7 @@ def phase_align(sig, ref_sig, plot=False):
         plt.legend(loc=4)
         plt.tight_layout()
         plt.savefig(fig_path)
-        plt.clf()
+        plt.close()
 
     return sig
 
diff --git a/dpd/src/subsample_align.py b/dpd/src/subsample_align.py
index 6d1cd2a..b0cbe88 100755
--- a/dpd/src/subsample_align.py
+++ b/dpd/src/subsample_align.py
@@ -78,7 +78,7 @@ def subsample_align(sig, ref_sig, plot=False):
             plt.plot(ixs, taus)
             plt.title("Subsample correlation, minimum is best: {}".format(best_tau))
             plt.savefig(tau_path)
-            plt.clf()
+            plt.close()
 
         # Prepare rotate_vec = fft_sig with rotated phase
         rotate_vec = np.exp(1j * best_tau * omega)