gr-dtv: Optimize DVB-T transmitter by consolidating blocks.

Move IFFT and normalization to Reference Signals block.
author: Ron Economos <w6rz@comcast.net> 2020-02-01 04:02:52 -0800
committer: Marcus Müller <marcus@hostalia.de> 2020-02-09 19:22:44 +0100
commit: 7d619aed8b8eb185890df2940cbee5de6062c4bd (patch)
tree: 84786055a7fb07e9bd57f5e5f462a60fac5e6465
parent: 8c8828804bea0095439fe59d249173969a7d31f8 (diff)
4 files changed, 136 insertions, 297 deletions
diff --git a/gr-dtv/examples/dvbt_tx_2k.grc b/gr-dtv/examples/dvbt_tx_2k.grc
index 72e5872e6f..c3a2772a21 100644
--- a/gr-dtv/examples/dvbt_tx_2k.grc
+++ b/gr-dtv/examples/dvbt_tx_2k.grc
@@ -1,6 +1,7 @@
 options:
   parameters:
     author: ''
+    catch_exceptions: 'True'
     category: Custom
     cmake_opt: ''
     comment: ''
@@ -22,8 +23,10 @@ options:
     sizing_mode: fixed
     thread_safe_setters: ''
     title: ''
-    window_size: 1280, 1024
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 12]
     rotation: 0
     state: enabled
@@ -35,6 +38,9 @@ blocks:
     comment: ''
     value: 429e6
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [176, 12]
     rotation: 0
     state: enabled
@@ -44,6 +50,9 @@ blocks:
     comment: ''
     value: (8000000.0 * 8) / 7
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 76]
     rotation: 0
     state: enabled
@@ -62,6 +71,9 @@ blocks:
     value: '50'
     widget: counter_slider
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [240, 496]
     rotation: 0
     state: enabled
@@ -80,6 +92,9 @@ blocks:
     value: '-8'
     widget: counter_slider
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 496]
     rotation: 0
     state: enabled
@@ -98,6 +113,9 @@ blocks:
     value: '10'
     widget: counter_slider
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [120, 496]
     rotation: 0
     state: enabled
@@ -117,39 +135,12 @@ blocks:
     type: byte
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [352, 60.0]
     rotation: 0
     state: enabled
-- name: blocks_multiply_const_xx_0
-  id: blocks_multiply_const_xx
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    const: '0.0022097087'
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    type: complex
-    vlen: '1'
-  states:
-    coordinate: [704, 404.0]
-    rotation: 0
-    state: enabled
-- name: blocks_vector_to_stream_0
-  id: blocks_vector_to_stream
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    num_items: '2048'
-    type: complex
-    vlen: '1'
-  states:
-    coordinate: [64, 320.0]
-    rotation: 0
-    state: enabled
 - name: digital_ofdm_cyclic_prefixer_0
   id: digital_ofdm_cyclic_prefixer
   parameters:
@@ -163,7 +154,10 @@ blocks:
     rolloff: '0'
     tagname: ''
   states:
-    coordinate: [424, 388.0]
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 388.0]
     rotation: 0
     state: enabled
 - name: dtv_dvbt_bit_inner_interleaver_0
@@ -178,6 +172,9 @@ blocks:
     minoutbuf: '0'
     transmission_mode: T2k
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [888, 212.0]
     rotation: 180
     state: enabled
@@ -193,6 +190,9 @@ blocks:
     maxoutbuf: '0'
     minoutbuf: '0'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1152, 76.0]
     rotation: 0
     state: enabled
@@ -206,6 +206,9 @@ blocks:
     minoutbuf: '0'
     nsize: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [624, 92.0]
     rotation: 0
     state: enabled
@@ -223,6 +226,9 @@ blocks:
     ninput: '1'
     noutput: '1512'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1136, 188.0]
     rotation: 180
     state: enabled
@@ -239,6 +245,9 @@ blocks:
     minoutbuf: '0'
     transmission_mode: T2k
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [352, 196.0]
     rotation: 180
     state: enabled
@@ -259,6 +268,9 @@ blocks:
     s: '51'
     t: '8'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [880, 36.0]
     rotation: 0
     state: enabled
@@ -280,7 +292,10 @@ blocks:
     transmission_mode: T2k
     type: complex
   states:
-    coordinate: [64, 132.0]
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 140.0]
     rotation: 180
     state: enabled
 - name: dtv_dvbt_symbol_inner_interleaver_0
@@ -294,116 +309,12 @@ blocks:
     minoutbuf: '0'
     transmission_mode: T2k
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [632, 212.0]
     rotation: 180
     state: enabled
-- name: fft_vxx_0
-  id: fft_vxx
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    fft_size: '2048'
-    forward: 'False'
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    nthreads: '1'
-    shift: 'True'
-    type: complex
-    window: window.rectangular(2048)
-  states:
-    coordinate: [64, 372.0]
-    rotation: 0
-    state: enabled
-- name: qtgui_const_sink_x_0
-  id: qtgui_const_sink_x
-  parameters:
-    affinity: ''
-    alias: ''
-    alpha1: '1.0'
-    alpha10: '1.0'
-    alpha2: '1.0'
-    alpha3: '1.0'
-    alpha4: '1.0'
-    alpha5: '1.0'
-    alpha6: '1.0'
-    alpha7: '1.0'
-    alpha8: '1.0'
-    alpha9: '1.0'
-    autoscale: 'False'
-    axislabels: 'True'
-    color1: '"blue"'
-    color10: '"red"'
-    color2: '"red"'
-    color3: '"red"'
-    color4: '"red"'
-    color5: '"red"'
-    color6: '"red"'
-    color7: '"red"'
-    color8: '"red"'
-    color9: '"red"'
-    comment: ''
-    grid: 'False'
-    gui_hint: ''
-    label1: ''
-    label10: ''
-    label2: ''
-    label3: ''
-    label4: ''
-    label5: ''
-    label6: ''
-    label7: ''
-    label8: ''
-    label9: ''
-    legend: 'True'
-    marker1: '0'
-    marker10: '0'
-    marker2: '0'
-    marker3: '0'
-    marker4: '0'
-    marker5: '0'
-    marker6: '0'
-    marker7: '0'
-    marker8: '0'
-    marker9: '0'
-    name: '""'
-    nconnections: '1'
-    size: '1024'
-    style1: '0'
-    style10: '0'
-    style2: '0'
-    style3: '0'
-    style4: '0'
-    style5: '0'
-    style6: '0'
-    style7: '0'
-    style8: '0'
-    style9: '0'
-    tr_chan: '0'
-    tr_level: '0.0'
-    tr_mode: qtgui.TRIG_MODE_FREE
-    tr_slope: qtgui.TRIG_SLOPE_POS
-    tr_tag: '""'
-    type: complex
-    update_time: '0.10'
-    width1: '1'
-    width10: '1'
-    width2: '1'
-    width3: '1'
-    width4: '1'
-    width5: '1'
-    width6: '1'
-    width7: '1'
-    width8: '1'
-    width9: '1'
-    xmax: '2'
-    xmin: '-2'
-    ymax: '2'
-    ymin: '-2'
-  states:
-    coordinate: [424, 308.0]
-    rotation: 0
-    state: enabled
 - name: uhd_usrp_sink_0
   id: uhd_usrp_sink
   parameters:
@@ -674,25 +585,24 @@ blocks:
     time_source7: ''
     type: fc32
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [984, 348.0]
     rotation: 0
     state: enabled
 
 connections:
 - [blocks_file_source_0, '0', dtv_dvbt_energy_dispersal_0, '0']
-- [blocks_multiply_const_xx_0, '0', uhd_usrp_sink_0, '0']
-- [blocks_vector_to_stream_0, '0', qtgui_const_sink_x_0, '0']
-- [digital_ofdm_cyclic_prefixer_0, '0', blocks_multiply_const_xx_0, '0']
+- [digital_ofdm_cyclic_prefixer_0, '0', uhd_usrp_sink_0, '0']
 - [dtv_dvbt_bit_inner_interleaver_0, '0', dtv_dvbt_symbol_inner_interleaver_0, '0']
 - [dtv_dvbt_convolutional_interleaver_0, '0', dtv_dvbt_inner_coder_0, '0']
 - [dtv_dvbt_energy_dispersal_0, '0', dtv_dvbt_reed_solomon_enc_0, '0']
 - [dtv_dvbt_inner_coder_0, '0', dtv_dvbt_bit_inner_interleaver_0, '0']
 - [dtv_dvbt_map_0, '0', dtv_dvbt_reference_signals_0, '0']
 - [dtv_dvbt_reed_solomon_enc_0, '0', dtv_dvbt_convolutional_interleaver_0, '0']
-- [dtv_dvbt_reference_signals_0, '0', blocks_vector_to_stream_0, '0']
-- [dtv_dvbt_reference_signals_0, '0', fft_vxx_0, '0']
+- [dtv_dvbt_reference_signals_0, '0', digital_ofdm_cyclic_prefixer_0, '0']
 - [dtv_dvbt_symbol_inner_interleaver_0, '0', dtv_dvbt_map_0, '0']
-- [fft_vxx_0, '0', digital_ofdm_cyclic_prefixer_0, '0']
 
 metadata:
   file_format: 1
diff --git a/gr-dtv/examples/dvbt_tx_8k.grc b/gr-dtv/examples/dvbt_tx_8k.grc
index cb8bc72fb7..bb4ecedda7 100644
--- a/gr-dtv/examples/dvbt_tx_8k.grc
+++ b/gr-dtv/examples/dvbt_tx_8k.grc
@@ -1,6 +1,7 @@
 options:
   parameters:
     author: ''
+    catch_exceptions: 'True'
     category: Custom
     cmake_opt: ''
     comment: ''
@@ -22,8 +23,10 @@ options:
     sizing_mode: fixed
     thread_safe_setters: ''
     title: ''
-    window_size: 1280, 1024
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 12]
     rotation: 0
     state: enabled
@@ -35,6 +38,9 @@ blocks:
     comment: ''
     value: 429e6
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [176, 12]
     rotation: 0
     state: enabled
@@ -44,6 +50,9 @@ blocks:
     comment: ''
     value: (8000000.0 * 8) / 7
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 76]
     rotation: 0
     state: enabled
@@ -62,6 +71,9 @@ blocks:
     value: '50'
     widget: counter_slider
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [240, 496]
     rotation: 0
     state: enabled
@@ -80,6 +92,9 @@ blocks:
     value: '-8'
     widget: counter_slider
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 496]
     rotation: 0
     state: enabled
@@ -98,6 +113,9 @@ blocks:
     value: '10'
     widget: counter_slider
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [120, 496]
     rotation: 0
     state: enabled
@@ -117,39 +135,12 @@ blocks:
     type: byte
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [352, 60.0]
     rotation: 0
     state: enabled
-- name: blocks_multiply_const_xx_0
-  id: blocks_multiply_const_xx
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    const: '0.0022097087'
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    type: complex
-    vlen: '1'
-  states:
-    coordinate: [704, 404.0]
-    rotation: 0
-    state: enabled
-- name: blocks_vector_to_stream_0
-  id: blocks_vector_to_stream
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    num_items: '8192'
-    type: complex
-    vlen: '1'
-  states:
-    coordinate: [64, 320.0]
-    rotation: 0
-    state: enabled
 - name: digital_ofdm_cyclic_prefixer_0
   id: digital_ofdm_cyclic_prefixer
   parameters:
@@ -163,7 +154,10 @@ blocks:
     rolloff: '0'
     tagname: ''
   states:
-    coordinate: [424, 388.0]
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 388.0]
     rotation: 0
     state: enabled
 - name: dtv_dvbt_bit_inner_interleaver_0
@@ -178,6 +172,9 @@ blocks:
     minoutbuf: '0'
     transmission_mode: T8k
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [888, 212.0]
     rotation: 180
     state: enabled
@@ -193,6 +190,9 @@ blocks:
     maxoutbuf: '0'
     minoutbuf: '0'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1152, 76.0]
     rotation: 0
     state: enabled
@@ -206,6 +206,9 @@ blocks:
     minoutbuf: '0'
     nsize: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [624, 92.0]
     rotation: 0
     state: enabled
@@ -223,6 +226,9 @@ blocks:
     ninput: '1'
     noutput: '6048'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1136, 188.0]
     rotation: 180
     state: enabled
@@ -239,6 +245,9 @@ blocks:
     minoutbuf: '0'
     transmission_mode: T8k
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [352, 196.0]
     rotation: 180
     state: enabled
@@ -259,6 +268,9 @@ blocks:
     s: '51'
     t: '8'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [880, 36.0]
     rotation: 0
     state: enabled
@@ -280,7 +292,10 @@ blocks:
     transmission_mode: T8k
     type: complex
   states:
-    coordinate: [64, 132.0]
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 140.0]
     rotation: 180
     state: enabled
 - name: dtv_dvbt_symbol_inner_interleaver_0
@@ -294,116 +309,12 @@ blocks:
     minoutbuf: '0'
     transmission_mode: T8k
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [632, 212.0]
     rotation: 180
     state: enabled
-- name: fft_vxx_0
-  id: fft_vxx
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    fft_size: '8192'
-    forward: 'False'
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    nthreads: '1'
-    shift: 'True'
-    type: complex
-    window: window.rectangular(8192)
-  states:
-    coordinate: [64, 372.0]
-    rotation: 0
-    state: enabled
-- name: qtgui_const_sink_x_0
-  id: qtgui_const_sink_x
-  parameters:
-    affinity: ''
-    alias: ''
-    alpha1: '1.0'
-    alpha10: '1.0'
-    alpha2: '1.0'
-    alpha3: '1.0'
-    alpha4: '1.0'
-    alpha5: '1.0'
-    alpha6: '1.0'
-    alpha7: '1.0'
-    alpha8: '1.0'
-    alpha9: '1.0'
-    autoscale: 'False'
-    axislabels: 'True'
-    color1: '"blue"'
-    color10: '"red"'
-    color2: '"red"'
-    color3: '"red"'
-    color4: '"red"'
-    color5: '"red"'
-    color6: '"red"'
-    color7: '"red"'
-    color8: '"red"'
-    color9: '"red"'
-    comment: ''
-    grid: 'False'
-    gui_hint: ''
-    label1: ''
-    label10: ''
-    label2: ''
-    label3: ''
-    label4: ''
-    label5: ''
-    label6: ''
-    label7: ''
-    label8: ''
-    label9: ''
-    legend: 'True'
-    marker1: '0'
-    marker10: '0'
-    marker2: '0'
-    marker3: '0'
-    marker4: '0'
-    marker5: '0'
-    marker6: '0'
-    marker7: '0'
-    marker8: '0'
-    marker9: '0'
-    name: '""'
-    nconnections: '1'
-    size: '1024'
-    style1: '0'
-    style10: '0'
-    style2: '0'
-    style3: '0'
-    style4: '0'
-    style5: '0'
-    style6: '0'
-    style7: '0'
-    style8: '0'
-    style9: '0'
-    tr_chan: '0'
-    tr_level: '0.0'
-    tr_mode: qtgui.TRIG_MODE_FREE
-    tr_slope: qtgui.TRIG_SLOPE_POS
-    tr_tag: '""'
-    type: complex
-    update_time: '0.10'
-    width1: '1'
-    width10: '1'
-    width2: '1'
-    width3: '1'
-    width4: '1'
-    width5: '1'
-    width6: '1'
-    width7: '1'
-    width8: '1'
-    width9: '1'
-    xmax: '2'
-    xmin: '-2'
-    ymax: '2'
-    ymin: '-2'
-  states:
-    coordinate: [424, 308.0]
-    rotation: 0
-    state: enabled
 - name: uhd_usrp_sink_0
   id: uhd_usrp_sink
   parameters:
@@ -674,25 +585,24 @@ blocks:
     time_source7: ''
     type: fc32
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [984, 348.0]
     rotation: 0
     state: enabled
 
 connections:
 - [blocks_file_source_0, '0', dtv_dvbt_energy_dispersal_0, '0']
-- [blocks_multiply_const_xx_0, '0', uhd_usrp_sink_0, '0']
-- [blocks_vector_to_stream_0, '0', qtgui_const_sink_x_0, '0']
-- [digital_ofdm_cyclic_prefixer_0, '0', blocks_multiply_const_xx_0, '0']
+- [digital_ofdm_cyclic_prefixer_0, '0', uhd_usrp_sink_0, '0']
 - [dtv_dvbt_bit_inner_interleaver_0, '0', dtv_dvbt_symbol_inner_interleaver_0, '0']
 - [dtv_dvbt_convolutional_interleaver_0, '0', dtv_dvbt_inner_coder_0, '0']
 - [dtv_dvbt_energy_dispersal_0, '0', dtv_dvbt_reed_solomon_enc_0, '0']
 - [dtv_dvbt_inner_coder_0, '0', dtv_dvbt_bit_inner_interleaver_0, '0']
 - [dtv_dvbt_map_0, '0', dtv_dvbt_reference_signals_0, '0']
 - [dtv_dvbt_reed_solomon_enc_0, '0', dtv_dvbt_convolutional_interleaver_0, '0']
-- [dtv_dvbt_reference_signals_0, '0', blocks_vector_to_stream_0, '0']
-- [dtv_dvbt_reference_signals_0, '0', fft_vxx_0, '0']
+- [dtv_dvbt_reference_signals_0, '0', digital_ofdm_cyclic_prefixer_0, '0']
 - [dtv_dvbt_symbol_inner_interleaver_0, '0', dtv_dvbt_map_0, '0']
-- [fft_vxx_0, '0', digital_ofdm_cyclic_prefixer_0, '0']
 
 metadata:
   file_format: 1
diff --git a/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.cc b/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.cc
index 88aa1c0014..14dfc03afc 100644
--- a/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.cc
+++ b/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.cc
@@ -1,6 +1,6 @@
 /* -*- c++ -*- */
 /*
- * Copyright 2015,2016,2018,2019 Free Software Foundation, Inc.
+ * Copyright 2015,2016,2018,2019,2020 Free Software Foundation, Inc.
  *
  * SPDX-License-Identifier: GPL-3.0-or-later
  *
@@ -1207,10 +1207,13 @@ dvbt_reference_signals_impl::dvbt_reference_signals_impl(
              transmission_mode,
              include_cell_id,
              cell_id),
-      d_pg(config)
+      d_pg(config),
+      d_ninput(ninput),
+      d_noutput(noutput),
+      ofdm_fft(config.d_transmission_mode == T2k ? 2048 : 8192, false, 1),
+      ofdm_fft_size(config.d_transmission_mode == T2k ? 2048 : 8192),
+      normalization(1.0 / std::sqrt(27.0 * config.d_payload_length))
 {
-    d_ninput = ninput;
-    d_noutput = noutput;
 }
 
 /*
@@ -1231,9 +1234,20 @@ int dvbt_reference_signals_impl::general_work(int noutput_items,
 {
     const gr_complex* in = (const gr_complex*)input_items[0];
     gr_complex* out = (gr_complex*)output_items[0];
+    gr_complex* dst;
 
     for (int i = 0; i < noutput_items; i++) {
         d_pg.update_output(&in[i * d_ninput], &out[i * d_noutput]);
+        dst = ofdm_fft.get_inbuf();
+        memcpy(&dst[ofdm_fft_size / 2],
+               &out[i * d_noutput],
+               sizeof(gr_complex) * ofdm_fft_size / 2);
+        memcpy(&dst[0],
+               &out[(i * d_noutput) + (ofdm_fft_size / 2)],
+               sizeof(gr_complex) * ofdm_fft_size / 2);
+        ofdm_fft.execute();
+        volk_32fc_s32fc_multiply_32fc(
+            &out[i * d_noutput], ofdm_fft.get_outbuf(), normalization, ofdm_fft_size);
     }
 
     // Tell runtime system how many input items we consumed on
diff --git a/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.h b/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.h
index d54a395ae2..2f8ef4215a 100644
--- a/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.h
+++ b/gr-dtv/lib/dvbt/dvbt_reference_signals_impl.h
@@ -1,6 +1,6 @@
 /* -*- c++ -*- */
 /*
- * Copyright 2015 Free Software Foundation, Inc.
+ * Copyright 2015,2020 Free Software Foundation, Inc.
  *
  * SPDX-License-Identifier: GPL-3.0-or-later
  *
@@ -11,6 +11,7 @@
 
 #include "dvbt_configure.h"
 #include <gnuradio/dtv/dvbt_reference_signals.h>
+#include <gnuradio/fft/fft.h>
 #include <deque>
 #include <vector>
 
@@ -227,6 +228,10 @@ private:
     int d_ninput;
     int d_noutput;
 
+    fft::fft_complex ofdm_fft;
+    int ofdm_fft_size;
+    float normalization;
+
 public:
     dvbt_reference_signals_impl(int itemsize,
                                 int ninput,
author	Ron Economos <w6rz@comcast.net>	2020-02-01 04:02:52 -0800
committer	Marcus Müller <marcus@hostalia.de>	2020-02-09 19:22:44 +0100
commit	7d619aed8b8eb185890df2940cbee5de6062c4bd (patch)
tree	84786055a7fb07e9bd57f5e5f462a60fac5e6465
parent	8c8828804bea0095439fe59d249173969a7d31f8 (diff)