Corrections for QPSK on hardware

2 files changed, 53 insertions, 51 deletions

diff --git a/flowgraphs/qpsk_hw.grc b/flowgraphs/qpsk_hw.grc
index 0acdc61..2ebc340 100644
--- a/flowgraphs/qpsk_hw.grc
+++ b/flowgraphs/qpsk_hw.grc
@@ -36,10 +36,10 @@ blocks:
   id: variable
   parameters:
     comment: ''
-    value: '[(-0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j),
+    value: 2 * np.array([(-0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j),
       (0.7071067811865475+0.7071067811865475j), (0.7071067811865475+0.7071067811865475j),
       (-0.7071067811865475-0.7071067811865475j), (0.7071067811865475+0.7071067811865475j),
-      (0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j)]'
+      (0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j)])
   states:
     bus_sink: false
     bus_source: false
@@ -124,7 +124,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [432, 1156.0]
+    coordinate: [256, 932.0]
     rotation: 0
     state: true
 - name: samp_rate
@@ -274,25 +274,6 @@ blocks:
     coordinate: [496, 1308.0]
     rotation: 0
     state: true
-- name: blocks_throttle_0
-  id: blocks_throttle
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    ignoretag: 'True'
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    samples_per_second: samp_rate
-    type: complex
-    vlen: '1'
-  states:
-    bus_sink: false
-    bus_source: false
-    bus_structure: null
-    coordinate: [720, 428.0]
-    rotation: 0
-    state: true
 - name: blocks_vector_source_x_0
   id: blocks_vector_source_x
   parameters:
@@ -331,7 +312,7 @@ blocks:
     bus_structure: null
     coordinate: [528, 980.0]
     rotation: 0
-    state: true
+    state: disabled
 - name: digital_constellation_decoder_cb_0
   id: digital_constellation_decoder_cb
   parameters:
@@ -380,7 +361,7 @@ blocks:
     minoutbuf: '0'
     sps: '1'
     symbols: access_code_symbols
-    threshold: '0.9'
+    threshold: '0.85'
     threshold_method: digital.THRESHOLD_ABSOLUTE
   states:
     bus_sink: false
@@ -389,6 +370,25 @@ blocks:
     coordinate: [768, 972.0]
     rotation: 0
     state: true
+- name: digital_lms_dd_equalizer_cc_0
+  id: digital_lms_dd_equalizer_cc
+  parameters:
+    affinity: ''
+    alias: ''
+    cnst: qpsk_const
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    mu: 3e-3
+    num_taps: '15'
+    sps: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [520, 1100.0]
+    rotation: 0
+    state: enabled
 - name: digital_pfb_clock_sync_xxx_0
   id: digital_pfb_clock_sync_xxx
   parameters:
@@ -523,7 +523,7 @@ blocks:
     bus_structure: null
     coordinate: [1008, 988.0]
     rotation: 0
-    state: true
+    state: enabled
 - name: import_0
   id: import
   parameters:
@@ -557,7 +557,7 @@ blocks:
     color1: '"blue"'
     color10: '"red"'
     color2: '"red"'
-    color3: '"red"'
+    color3: '"dark green"'
     color4: '"red"'
     color5: '"red"'
     color6: '"red"'
@@ -589,7 +589,7 @@ blocks:
     marker8: '0'
     marker9: '0'
     name: '""'
-    nconnections: '2'
+    nconnections: '3'
     size: '1024'
     style1: '0'
     style10: '0'
@@ -626,7 +626,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [1208, 804.0]
+    coordinate: [1128, 784.0]
     rotation: 0
     state: true
 - name: qtgui_time_sink_x_0
@@ -828,7 +828,7 @@ blocks:
     center_freq8: '0'
     center_freq9: '0'
     clock_rate: 0e0
-    clock_source0: internal
+    clock_source0: external
     clock_source1: ''
     clock_source2: ''
     clock_source3: ''
@@ -1105,7 +1105,7 @@ blocks:
     center_freq8: '0'
     center_freq9: '0'
     clock_rate: 0e0
-    clock_source0: ''
+    clock_source0: external
     clock_source1: ''
     clock_source2: ''
     clock_source3: ''
@@ -1372,7 +1372,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [696, 684.0]
+    coordinate: [696, 676.0]
     rotation: 0
     state: true
 - name: virtual_sink_0
@@ -1385,7 +1385,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [928, 428.0]
+    coordinate: [768, 428.0]
     rotation: 0
     state: true
 - name: virtual_sink_1
@@ -1450,7 +1450,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [56, 756.0]
+    coordinate: [56, 764.0]
     rotation: 0
     state: true
 
@@ -1461,21 +1461,24 @@ connections:
 - [blocks_stream_mux_0, '0', digital_constellation_modulator_0, '0']
 - [blocks_stream_to_vector_0, '0', fadingui_ber_0, '0']
 - [blocks_tagged_stream_align_0, '0', blocks_repack_bits_bb_0, '0']
-- [blocks_throttle_0, '0', virtual_sink_0, '0']
 - [blocks_vector_source_x_0, '0', blocks_stream_mux_0, '0']
 - [digital_cma_equalizer_cc_0, '0', digital_corr_est_cc_0, '0']
 - [digital_cma_equalizer_cc_0, '0', fadingui_netsink_1, '0']
+- [digital_cma_equalizer_cc_0, '0', qtgui_const_sink_x_0_0, '1']
 - [digital_constellation_decoder_cb_0, '0', blocks_tagged_stream_align_0, '0']
-- [digital_constellation_modulator_0, '0', blocks_throttle_0, '0']
 - [digital_constellation_modulator_0, '0', fadingui_netsink_0, '0']
+- [digital_constellation_modulator_0, '0', virtual_sink_0, '0']
 - [digital_corr_est_cc_0, '0', fadingui_phasecorrection_0, '0']
 - [digital_corr_est_cc_0, '1', blocks_complex_to_mag_0, '0']
+- [digital_lms_dd_equalizer_cc_0, '0', digital_corr_est_cc_0, '0']
+- [digital_lms_dd_equalizer_cc_0, '0', qtgui_const_sink_x_0_0, '1']
 - [digital_pfb_clock_sync_xxx_0, '0', digital_cma_equalizer_cc_0, '0']
+- [digital_pfb_clock_sync_xxx_0, '0', digital_lms_dd_equalizer_cc_0, '0']
 - [digital_pfb_clock_sync_xxx_0, '0', fadingui_netsink_4, '0']
 - [digital_pfb_clock_sync_xxx_0, '0', qtgui_const_sink_x_0_0, '0']
 - [fadingui_datasource_0, '0', digital_constellation_modulator_0, '0']
 - [fadingui_phasecorrection_0, '0', fadingui_netsink_3, '0']
-- [fadingui_phasecorrection_0, '0', qtgui_const_sink_x_0_0, '1']
+- [fadingui_phasecorrection_0, '0', qtgui_const_sink_x_0_0, '2']
 - [fadingui_phasecorrection_0, '0', virtual_sink_2, '0']
 - [uhd_usrp_source_0, '0', virtual_sink_1, '0']
 - [virtual_source_0, '0', digital_constellation_decoder_cb_0, '0']
diff --git a/flowgraphs/qpsk_hw.py b/flowgraphs/qpsk_hw.py
index 198f944..eb6bf70 100755
--- a/flowgraphs/qpsk_hw.py
+++ b/flowgraphs/qpsk_hw.py
@@ -81,11 +81,11 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
         self.sps = sps = 4
         self.nfilts = nfilts = 32
         self.excess_bw = excess_bw = 0.35
-        self.samp_rate = samp_rate = 1.5e6
+        self.samp_rate = samp_rate = 1e6
         self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), excess_bw, 45*nfilts)
         self.qpsk_const = qpsk_const = digital.constellation_qpsk().base()
         self.frame_len = frame_len = len(testvec) +4
-        self.access_code_symbols = access_code_symbols = [(-0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j), (0.7071067811865475+0.7071067811865475j), (0.7071067811865475+0.7071067811865475j), (-0.7071067811865475-0.7071067811865475j), (0.7071067811865475+0.7071067811865475j), (0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j)]
+        self.access_code_symbols = access_code_symbols = 2 * np.array([(-0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j), (0.7071067811865475+0.7071067811865475j), (0.7071067811865475+0.7071067811865475j), (-0.7071067811865475-0.7071067811865475j), (0.7071067811865475+0.7071067811865475j), (0.7071067811865475-0.7071067811865475j), (0.7071067811865475-0.7071067811865475j)])
 
         ##################################################
         # Blocks
@@ -98,6 +98,7 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
                 channels=list(range(0,1)),
             ),
         )
+        self.uhd_usrp_source_0.set_clock_source('external', 0)
         self.uhd_usrp_source_0.set_center_freq(2.4e9, 0)
         self.uhd_usrp_source_0.set_normalized_gain(1, 0)
         self.uhd_usrp_source_0.set_antenna('RX2', 0)
@@ -112,7 +113,7 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
             ),
             '',
         )
-        self.uhd_usrp_sink_0.set_clock_source('internal', 0)
+        self.uhd_usrp_sink_0.set_clock_source('external', 0)
         self.uhd_usrp_sink_0.set_center_freq(2.4e9, 0)
         self.uhd_usrp_sink_0.set_normalized_gain(0.4, 0)
         self.uhd_usrp_sink_0.set_antenna('TX/RX', 0)
@@ -168,7 +169,7 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
         self.qtgui_const_sink_x_0_0 = qtgui.const_sink_c(
             1024, #size
             "", #name
-            2 #number of inputs
+            3 #number of inputs
         )
         self.qtgui_const_sink_x_0_0.set_update_time(0.10)
         self.qtgui_const_sink_x_0_0.set_y_axis(-2, 2)
@@ -183,7 +184,7 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
             '', '', '', '', '']
         widths = [1, 1, 1, 1, 1,
             1, 1, 1, 1, 1]
-        colors = ["blue", "red", "red", "red", "red",
+        colors = ["blue", "red", "dark green", "red", "red",
             "red", "red", "red", "red", "red"]
         styles = [0, 0, 0, 0, 0,
             0, 0, 0, 0, 0]
@@ -192,7 +193,7 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
         alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
             1.0, 1.0, 1.0, 1.0, 1.0]
 
-        for i in range(2):
+        for i in range(3):
             if len(labels[i]) == 0:
                 self.qtgui_const_sink_x_0_0.set_line_label(i, "Data {0}".format(i))
             else:
@@ -208,7 +209,8 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
         self.fadingui_phasecorrection_0 = fadingui.phasecorrection(frame_len)
         self.fadingui_ber_0 = fadingui.ber(vgl=testvec + list(np.zeros(4)), vlen=frame_len)
         self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps, 2 * np.pi / 100, rrc_taps, 32, 16, 1.5, 1)
-        self.digital_corr_est_cc_0 = digital.corr_est_cc(access_code_symbols, 1, len(access_code_symbols) // 2, 0.9, digital.THRESHOLD_ABSOLUTE)
+        self.digital_lms_dd_equalizer_cc_0 = digital.lms_dd_equalizer_cc(15, 3e-3, 1, qpsk_const)
+        self.digital_corr_est_cc_0 = digital.corr_est_cc(access_code_symbols, 1, len(access_code_symbols) // 2, 0.85, digital.THRESHOLD_ABSOLUTE)
         self.digital_constellation_modulator_0 = digital.generic_mod(
             constellation=qpsk_const,
             differential=False,
@@ -218,9 +220,7 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
             verbose=False,
             log=False)
         self.digital_constellation_decoder_cb_0 = digital.constellation_decoder_cb(qpsk_const)
-        self.digital_cma_equalizer_cc_0 = digital.cma_equalizer_cc(15, 1, 2e-3, 1)
         self.blocks_vector_source_x_0 = blocks.vector_source_b(testvec, True, 1, [])
-        self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
         self.blocks_tagged_stream_align_0 = blocks.tagged_stream_align(gr.sizeof_char*1, 'frame_start')
         self.blocks_stream_to_vector_0 = blocks.stream_to_vector(gr.sizeof_char*1, frame_len)
         self.blocks_stream_mux_0 = blocks.stream_mux(gr.sizeof_char*1, [len(testvec), 4])
@@ -239,17 +239,17 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
         self.connect((self.blocks_stream_mux_0, 0), (self.digital_constellation_modulator_0, 0))
         self.connect((self.blocks_stream_to_vector_0, 0), (self.fadingui_ber_0, 0))
         self.connect((self.blocks_tagged_stream_align_0, 0), (self.blocks_repack_bits_bb_0, 0))
-        self.connect((self.blocks_throttle_0, 0), (self.uhd_usrp_sink_0, 0))
         self.connect((self.blocks_vector_source_x_0, 0), (self.blocks_stream_mux_0, 0))
-        self.connect((self.digital_cma_equalizer_cc_0, 0), (self.digital_corr_est_cc_0, 0))
         self.connect((self.digital_constellation_decoder_cb_0, 0), (self.blocks_tagged_stream_align_0, 0))
-        self.connect((self.digital_constellation_modulator_0, 0), (self.blocks_throttle_0, 0))
+        self.connect((self.digital_constellation_modulator_0, 0), (self.uhd_usrp_sink_0, 0))
         self.connect((self.digital_corr_est_cc_0, 1), (self.blocks_complex_to_mag_0, 0))
         self.connect((self.digital_corr_est_cc_0, 0), (self.fadingui_phasecorrection_0, 0))
-        self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.digital_cma_equalizer_cc_0, 0))
+        self.connect((self.digital_lms_dd_equalizer_cc_0, 0), (self.digital_corr_est_cc_0, 0))
+        self.connect((self.digital_lms_dd_equalizer_cc_0, 0), (self.qtgui_const_sink_x_0_0, 1))
+        self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.digital_lms_dd_equalizer_cc_0, 0))
         self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.qtgui_const_sink_x_0_0, 0))
         self.connect((self.fadingui_phasecorrection_0, 0), (self.digital_constellation_decoder_cb_0, 0))
-        self.connect((self.fadingui_phasecorrection_0, 0), (self.qtgui_const_sink_x_0_0, 1))
+        self.connect((self.fadingui_phasecorrection_0, 0), (self.qtgui_const_sink_x_0_0, 2))
         self.connect((self.uhd_usrp_source_0, 0), (self.digital_pfb_clock_sync_xxx_0, 0))
 
 
@@ -293,7 +293,6 @@ class qpsk_hw(gr.top_block, Qt.QWidget):
 
     def set_samp_rate(self, samp_rate):
         self.samp_rate = samp_rate
-        self.blocks_throttle_0.set_sample_rate(self.samp_rate)
         self.qtgui_time_sink_x_0.set_samp_rate(self.samp_rate / self.sps)
         self.uhd_usrp_sink_0.set_samp_rate(self.samp_rate)
         self.uhd_usrp_source_0.set_samp_rate(self.samp_rate)