diff options
Diffstat (limited to 'tests/correlator')
| -rw-r--r-- | tests/correlator/correlator.grc | 502 | ||||
| -rwxr-xr-x | tests/correlator/correlator.py | 17 | ||||
| -rw-r--r-- | tests/correlator/epy_block_0.py | 32 |
3 files changed, 157 insertions, 394 deletions
diff --git a/tests/correlator/correlator.grc b/tests/correlator/correlator.grc index beea007..c34e5a9 100644 --- a/tests/correlator/correlator.grc +++ b/tests/correlator/correlator.grc @@ -36,15 +36,15 @@ blocks: id: variable parameters: comment: '' - value: '[(-1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), + value: .5 * np.array([(-1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (-1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), - (1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j)]' + (1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j)]) states: bus_sink: false bus_source: false bus_structure: null - coordinate: [768, 1016.0] + coordinate: [792, 788.0] rotation: 0 state: enabled - name: const @@ -101,7 +101,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [48, 440.0] + coordinate: [784, 1052.0] rotation: 0 state: enabled - name: rrc_taps @@ -164,22 +164,6 @@ blocks: coordinate: [224, 936.0] rotation: 0 state: enabled -- name: blocks_complex_to_magphase_0 - id: blocks_complex_to_magphase - parameters: - affinity: '' - alias: '' - comment: '' - maxoutbuf: '0' - minoutbuf: '0' - vlen: '1' - states: - bus_sink: false - bus_source: false - bus_structure: null - coordinate: [1040, 568.0] - rotation: 0 - state: disabled - name: blocks_complex_to_magphase_0_0 id: blocks_complex_to_magphase parameters: @@ -193,27 +177,9 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1080, 1176.0] + coordinate: [1056, 984.0] rotation: 0 state: enabled -- name: blocks_multiply_const_vxx_0 - id: blocks_multiply_const_vxx - parameters: - affinity: '' - alias: '' - comment: '' - const: 180 / 3.141592653589793 - maxoutbuf: '0' - minoutbuf: '0' - type: float - vlen: '1' - states: - bus_sink: false - bus_source: false - bus_structure: null - coordinate: [1288, 596.0] - rotation: 0 - state: disabled - name: blocks_multiply_const_vxx_0_0 id: blocks_multiply_const_vxx parameters: @@ -229,7 +195,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1376, 1248.0] + coordinate: [1312, 1076.0] rotation: 0 state: disabled - name: blocks_null_sink_3 @@ -246,7 +212,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1376, 1304.0] + coordinate: [1360, 1016.0] rotation: 0 state: true - name: blocks_null_source_0 @@ -294,7 +260,7 @@ blocks: affinity: '' alias: '' comment: '' - lengths: '[5, len(testvec)]' + lengths: '[0, len(testvec)]' maxoutbuf: '0' minoutbuf: '0' num_inputs: '2' @@ -307,6 +273,43 @@ blocks: coordinate: [288, 256.0] rotation: 0 state: enabled +- name: blocks_tag_debug_0 + id: blocks_tag_debug + parameters: + affinity: '' + alias: '' + comment: '' + display: 'True' + filter: '""' + name: '' + num_inputs: '1' + type: byte + vlen: '1' + states: + bus_sink: false + bus_source: false + bus_structure: null + coordinate: [1208, 1164.0] + rotation: 0 + state: disabled +- name: blocks_tagged_stream_align_0 + id: blocks_tagged_stream_align + parameters: + affinity: '' + alias: '' + comment: '' + lengthtagname: frame_start + maxoutbuf: '0' + minoutbuf: '0' + type: byte + vlen: '1' + states: + bus_sink: false + bus_source: false + bus_structure: null + coordinate: [928, 1260.0] + rotation: 0 + state: true - name: blocks_throttle_0 id: blocks_throttle parameters: @@ -354,7 +357,7 @@ blocks: block_tags: 'False' comment: '' epsilon: '1.0' - freq_offset: '0.0001' + freq_offset: '0.002' maxoutbuf: '0' minoutbuf: '0' noise_voltage: '0.01' @@ -429,18 +432,18 @@ blocks: affinity: '' alias: '' comment: '' - mark_delay: '0' + mark_delay: len(access_code_symbols) // 2 maxoutbuf: '0' minoutbuf: '0' sps: '1' symbols: access_code_symbols - threshold: '.8' - threshold_method: digital.THRESHOLD_DYNAMIC + threshold: '.9' + threshold_method: digital.THRESHOLD_ABSOLUTE states: bus_sink: false bus_source: false bus_structure: null - coordinate: [768, 892.0] + coordinate: [792, 668.0] rotation: 0 state: enabled - name: digital_costas_loop_cc_0 @@ -458,7 +461,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1080, 1000.0] + coordinate: [1104, 808.0] rotation: 0 state: true - name: digital_map_bb_0 @@ -476,7 +479,7 @@ blocks: bus_structure: null coordinate: [496, 1260.0] rotation: 0 - state: bypassed + state: enabled - name: digital_pfb_clock_sync_xxx_0 id: digital_pfb_clock_sync_xxx parameters: @@ -504,31 +507,33 @@ blocks: id: epy_block parameters: _source_code: "import pmt\n\nimport numpy as np\nfrom gnuradio import gr\n\n\n\ - class blk(gr.sync_block):\n def __init__(self):\n gr.sync_block.__init__(\n\ - \ self,\n name='Phase and Frequency Correction',\n \ - \ in_sig=[np.complex64],\n out_sig=[np.complex64]\n \ - \ )\n\n # tags should not be propagated, we then output our own tags\n\ - \ self.set_tag_propagation_policy(gr.TPP_DONT)\n\n # because we\ - \ do block processing, we need to keep track of the last tag\n # of the\ - \ previous block to correct the first values of the next block\n self.last\ - \ = None\n self.lastfreq = 0\n\n def block_phase(self, start, end):\n\ - \ \"\"\"\n Compute a vector for the phase and frequency correction\ - \ for the samples\n between two tags (start and end).\n\n @param\ - \ start Tag where the samples should start to be corrected\n @param end\ - \ Tag where to stop correcting\n\n @return A vector of phase values\ - \ for each sample. If we call the ouput\n `phase' to correct\ - \ the samples between the start and end tags,\n TODO: finish\n\ - \ \"\"\"\n # compute number of samples in block\n nsamples\ - \ = end.offset - start.offset\n\n # unpack pmt values into start and\ - \ end phase\n sphase = pmt.to_python(start.value)\n ephase = pmt.to_python(end.value)\n\ + class blk(gr.sync_block):\n \"\"\"\n Apply phase and frequency correction\ + \ where there is a correlation peak tag.\n\n The correlation peak tags are\ + \ NOT propagated, and instead replaced with a\n frame_start tag.\n \"\"\ + \"\n def __init__(self):\n gr.sync_block.__init__(\n self,\n\ + \ name='Phase and Frequency Correction',\n in_sig=[np.complex64],\n\ + \ out_sig=[np.complex64]\n )\n\n # tags should not\ + \ be propagated, we then output our own tags\n self.set_tag_propagation_policy(gr.TPP_DONT)\n\ + \n # because we do block processing, we need to keep track of the last\ + \ tag\n # of the previous block to correct the first values of the next\ + \ block\n self.last = None\n self.lastfreq = 0\n\n def block_phase(self,\ + \ start, end):\n \"\"\"\n Compute a vector for the phase and frequency\ + \ correction for the samples\n between two tags (start and end).\n\n\ + \ @param start Tag where the samples should start to be corrected\n \ + \ @param end Tag where to stop correcting\n\n @return A vector\ + \ of phase values for each sample. To correct the samples\n the\ + \ data should be multiplied with np.exp(-1j * phase)\n \"\"\"\n \ + \ # compute number of samples between tags\n nsamples = end.offset\ + \ - start.offset\n\n # unpack pmt values into start and end phase\n \ + \ sphase = pmt.to_python(start.value)\n ephase = pmt.to_python(end.value)\n\ \n # compute frequency offset between start and end\n phasediff\ \ = ephase - sphase\n\n if phasediff > np.pi:\n phasediff\ \ -= 2*np.pi\n\n elif phasediff < -np.pi:\n phasediff += 2*np.pi\n\ \n freq = phasediff / nsamples\n\n # save this one for the last\ \ block (see variable `end' in self.work)\n self.lastfreq = freq\n\n\ - \ # debugging\n print(f\"Correction for block of {nsamples:2d}\ + \ # debugging\n print(f\"Correction for chunk of {nsamples:2d}\ \ samples is \" \\\n f\"sphase={sphase: .4f} rad and freq={freq*1e3:\ - \ .4f} milli rad / sample\")\n\n # compute block values\n return\ + \ .4f} milli rad / sample\")\n\n # compute chunk values\n return\ \ sphase * np.ones(nsamples) + freq * np.arange(0, nsamples)\n\n def work(self,\ \ input_items, output_items):\n counter = self.nitems_written(0)\n\n\ \ # nicer aliases\n inp = input_items[0]\n out = output_items[0]\n\ @@ -540,14 +545,14 @@ blocks: \ = {tags[-1].offset - tags[0].offset} \" \\\n f\"samples out of\ \ {len(inp)} input samples\")\n\n # compute \"the middle\"\n enough_samples\ \ = lambda pair: ((pair[1].offset - pair[0].offset) > 0)\n pairs = list(filter(enough_samples,\ - \ zip(tags, tags[1:])))\n blocks = [ self.block_phase(start, end) for\ - \ (start, end) in pairs ]\n middle = np.concatenate(blocks) if blocks\ + \ zip(tags, tags[1:])))\n chunks = [ self.block_phase(start, end) for\ + \ (start, end) in pairs ]\n middle = np.concatenate(chunks) if chunks\ \ else []\n\n # compute values at the end, we do not have informations\ - \ about the future\n # but we can use the frequency of the last block\ - \ to approximate\n nback = len(inp) - (tags[-1].offset - counter)\n \ - \ print(f\"Processing {nback} samples at the back of the buffer\")\n \ - \ end = np.ones(nback) * pmt.to_python(tags[-1].value) \\\n \ - \ + self.lastfreq * np.arange(0, nback)\n\n # compute the \"start\"\ + \ about the future\n # but we can use the frequency of the last tag to\ + \ approximate\n nback = len(inp) - (tags[-1].offset - counter)\n \ + \ print(f\"Processing {nback} samples at the back of the buffer\")\n \ + \ end = np.ones(nback) * pmt.to_python(tags[-1].value) \\\n \ + \ + self.lastfreq * np.arange(0, nback)\n\n # compute the \"start\"\ , using the last tag from the previous call\n nfront = tags[0].offset\ \ - counter\n print(f\"Processing {nfront} samples at the front of the\ \ buffer\")\n start = self.block_phase(self.last, tags[0])[-nfront:]\ @@ -555,9 +560,11 @@ blocks: \ # compute correction\n correction = np.exp(-1j * np.concatenate([start,\ \ middle, end]))\n length = len(correction)\n\n # write outputs\n\ \ out[:length] = inp[:length] * correction\n\n # save last tag\ - \ for next call\n self.last = tags[-1]\n\n # FIXME: should return\ - \ `length' but then the last sample is not\n # included and self.last\ - \ does something weird\n return len(out)\n" + \ for next call\n self.last = tags[-1]\n\n # add tags\n \ + \ for tag in tags:\n self.add_item_tag(0, tag.offset, pmt.intern(\"\ + frame_start\"), pmt.PMT_T)\n\n # FIXME: should return `length' but then\ + \ the last sample is not\n # included and self.last does something\ + \ weird\n return len(out)\n" affinity: '' alias: '' comment: '' @@ -565,11 +572,13 @@ blocks: minoutbuf: '0' states: _io_cache: ('Phase and Frequency Correction', 'blk', [], [('0', 'complex', 1)], - [('0', 'complex', 1)], '', []) + [('0', 'complex', 1)], '\n Apply phase and frequency correction where there + is a correlation peak tag.\n\n The correlation peak tags are NOT propagated, + and instead replaced with a\n frame_start tag.\n ', []) bus_sink: false bus_source: false bus_structure: null - coordinate: [1072, 912.0] + coordinate: [1088, 688.0] rotation: 0 state: enabled - name: epy_block_1 @@ -595,7 +604,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [920, 1264.0] + coordinate: [1232, 1264.0] rotation: 0 state: true - name: fir_filter_xxx_1 @@ -614,7 +623,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [776, 692.0] + coordinate: [784, 988.0] rotation: 0 state: disabled - name: import_0 @@ -630,6 +639,23 @@ blocks: coordinate: [184, 12.0] rotation: 0 state: true +- name: note_0 + id: note + parameters: + alias: '' + comment: 'THIS FLOWGRAPH MUST BE RUN + + FROM THE TERMINAL BECAUSE + + IT HAS A HUGE OUTPUT (PRINT)' + note: README + states: + bus_sink: false + bus_source: false + bus_structure: null + coordinate: [280, 12.0] + rotation: 0 + state: true - name: qtgui_const_sink_x_0 id: qtgui_const_sink_x parameters: @@ -719,7 +745,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [768, 592.0] + coordinate: [792, 572.0] rotation: 0 state: enabled - name: qtgui_const_sink_x_0_0 @@ -811,198 +837,9 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1408, 964.0] + coordinate: [1416, 772.0] rotation: 0 state: enabled -- name: qtgui_const_sink_x_1 - id: qtgui_const_sink_x - parameters: - affinity: '' - alias: '' - alpha1: '.5' - 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: 'True' - axislabels: 'True' - color1: '"blue"' - color10: '"red"' - color2: '"red"' - color3: '"red"' - color4: '"red"' - color5: '"red"' - color6: '"red"' - color7: '"red"' - color8: '"red"' - color9: '"red"' - comment: '' - grid: 'True' - gui_hint: 2,1,2,1 - label1: '' - label10: '' - label2: '' - label3: '' - label4: '' - label5: '' - label6: '' - label7: '' - label8: '' - label9: '' - legend: 'True' - marker1: '9' - marker10: '0' - marker2: '0' - marker3: '0' - marker4: '0' - marker5: '0' - marker6: '0' - marker7: '0' - marker8: '0' - marker9: '0' - name: '"Cross Correlation"' - nconnections: '1' - size: '1024' - style1: '2' - 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: - bus_sink: false - bus_source: false - bus_structure: null - coordinate: [1040, 480.0] - rotation: 0 - state: disabled -- name: qtgui_time_sink_x_0 - id: qtgui_time_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: 'True' - axislabels: 'True' - color1: blue - color10: dark blue - color2: red - color3: green - color4: black - color5: cyan - color6: magenta - color7: yellow - color8: dark red - color9: dark green - comment: '' - ctrlpanel: 'False' - entags: 'True' - grid: 'False' - gui_hint: 2,0,1,1 - label1: Signal 1 - label10: Signal 10 - label2: Signal 2 - label3: Signal 3 - label4: Signal 4 - label5: Signal 5 - label6: Signal 6 - label7: Signal 7 - label8: Signal 8 - label9: Signal 9 - legend: 'True' - marker1: '-1' - marker10: '-1' - marker2: '-1' - marker3: '-1' - marker4: '-1' - marker5: '-1' - marker6: '-1' - marker7: '-1' - marker8: '-1' - marker9: '-1' - name: '""' - nconnections: '1' - size: '1024' - srate: samp_rate - stemplot: 'False' - style1: '1' - style10: '1' - style2: '1' - style3: '1' - style4: '1' - style5: '1' - style6: '1' - style7: '1' - style8: '1' - style9: '1' - tr_chan: '0' - tr_delay: '0' - tr_level: '0.0' - tr_mode: qtgui.TRIG_MODE_FREE - tr_slope: qtgui.TRIG_SLOPE_POS - tr_tag: '""' - type: float - update_time: '0.10' - width1: '1' - width10: '1' - width2: '1' - width3: '1' - width4: '1' - width5: '1' - width6: '1' - width7: '1' - width8: '1' - width9: '1' - ylabel: XC Magnitude - ymax: '20' - ymin: '0' - yunit: '""' - states: - bus_sink: false - bus_source: false - bus_structure: null - coordinate: [1312, 480.0] - rotation: 0 - state: disabled - name: qtgui_time_sink_x_0_0 id: qtgui_time_sink_x parameters: @@ -1097,7 +934,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1376, 1156.0] + coordinate: [1472, 964.0] rotation: 0 state: enabled - name: qtgui_time_sink_x_0_0_0 @@ -1194,7 +1031,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1072, 788.0] + coordinate: [1096, 572.0] rotation: 0 state: enabled - name: qtgui_time_sink_x_1_0 @@ -1291,7 +1128,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [800, 320.0] + coordinate: [800, 172.0] rotation: 0 state: enabled - name: qtgui_time_sink_x_1_1 @@ -1388,104 +1225,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [768, 480.0] - rotation: 0 - state: disabled -- name: qtgui_time_sink_x_2 - id: qtgui_time_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: 'True' - axislabels: 'True' - color1: blue - color10: dark blue - color2: red - color3: green - color4: black - color5: cyan - color6: magenta - color7: yellow - color8: dark red - color9: dark green - comment: '' - ctrlpanel: 'False' - entags: 'True' - grid: 'False' - gui_hint: 3,0,1,1 - label1: Signal 1 - label10: Signal 10 - label2: Signal 2 - label3: Signal 3 - label4: Signal 4 - label5: Signal 5 - label6: Signal 6 - label7: Signal 7 - label8: Signal 8 - label9: Signal 9 - legend: 'True' - marker1: '-1' - marker10: '-1' - marker2: '-1' - marker3: '-1' - marker4: '-1' - marker5: '-1' - marker6: '-1' - marker7: '-1' - marker8: '-1' - marker9: '-1' - name: '""' - nconnections: '1' - size: '1024' - srate: samp_rate - stemplot: 'False' - style1: '1' - style10: '1' - style2: '1' - style3: '1' - style4: '1' - style5: '1' - style6: '1' - style7: '1' - style8: '1' - style9: '1' - tr_chan: '0' - tr_delay: '0' - tr_level: '0.0' - tr_mode: qtgui.TRIG_MODE_FREE - tr_slope: qtgui.TRIG_SLOPE_POS - tr_tag: '""' - type: float - update_time: '0.10' - width1: '1' - width10: '1' - width2: '1' - width3: '1' - width4: '1' - width5: '1' - width6: '1' - width7: '1' - width8: '1' - width9: '1' - ylabel: XC Phase - ymax: '1' - ymin: '-1' - yunit: '""' - states: - bus_sink: false - bus_source: false - bus_structure: null - coordinate: [1488, 580.0] + coordinate: [792, 484.0] rotation: 0 state: disabled - name: qtgui_time_sink_x_2_0 @@ -1582,7 +1322,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1552, 1232.0] + coordinate: [1472, 1060.0] rotation: 0 state: disabled - name: virtual_sink_0 @@ -1608,7 +1348,7 @@ blocks: bus_sink: false bus_source: false bus_structure: null - coordinate: [1400, 828.0] + coordinate: [1416, 684.0] rotation: 0 state: true - name: virtual_source_0 @@ -1639,16 +1379,15 @@ blocks: state: true connections: -- [blocks_complex_to_magphase_0, '0', qtgui_time_sink_x_0, '0'] -- [blocks_complex_to_magphase_0, '1', blocks_multiply_const_vxx_0, '0'] - [blocks_complex_to_magphase_0_0, '0', qtgui_time_sink_x_0_0, '0'] - [blocks_complex_to_magphase_0_0, '1', blocks_multiply_const_vxx_0_0, '0'] - [blocks_complex_to_magphase_0_0, '1', blocks_null_sink_3, '0'] -- [blocks_multiply_const_vxx_0, '0', qtgui_time_sink_x_2, '0'] - [blocks_multiply_const_vxx_0_0, '0', qtgui_time_sink_x_2_0, '0'] - [blocks_null_source_0, '0', blocks_stream_mux_0, '0'] -- [blocks_repack_bits_bb_0, '0', epy_block_1, '0'] +- [blocks_repack_bits_bb_0, '0', blocks_tagged_stream_align_0, '0'] - [blocks_stream_mux_0, '0', digital_constellation_modulator_0, '0'] +- [blocks_tagged_stream_align_0, '0', blocks_tag_debug_0, '0'] +- [blocks_tagged_stream_align_0, '0', epy_block_1, '0'] - [blocks_throttle_0, '0', virtual_sink_0, '0'] - [blocks_vector_source_x_0, '0', blocks_stream_mux_0, '1'] - [channels_channel_model_0, '0', blocks_throttle_0, '0'] @@ -1668,8 +1407,7 @@ connections: - [digital_pfb_clock_sync_xxx_0, '0', digital_cma_equalizer_cc_0, '0'] - [epy_block_0, '0', qtgui_const_sink_x_0_0, '0'] - [epy_block_0, '0', virtual_sink_3, '0'] -- [fir_filter_xxx_1, '0', blocks_complex_to_magphase_0, '0'] -- [fir_filter_xxx_1, '0', qtgui_const_sink_x_1, '0'] +- [fir_filter_xxx_1, '0', blocks_complex_to_magphase_0_0, '0'] - [virtual_source_0, '0', digital_pfb_clock_sync_xxx_0, '0'] - [virtual_source_1, '0', digital_constellation_decoder_cb_0, '0'] diff --git a/tests/correlator/correlator.py b/tests/correlator/correlator.py index 255010a..d9dedb2 100755 --- a/tests/correlator/correlator.py +++ b/tests/correlator/correlator.py @@ -85,7 +85,7 @@ class correlator(gr.top_block, Qt.QWidget): self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), excess_bw, 45*nfilts) self.revconj_access_code_symbols = revconj_access_code_symbols = [(1.4142135623730951+1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (-1.4142135623730951+1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (-1.4142135623730951+1.4142135623730951j)] self.const = const = digital.constellation_qpsk().base() - self.access_code_symbols = access_code_symbols = [(-1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (-1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j)] + self.access_code_symbols = access_code_symbols = .5 * np.array([(-1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (-1.4142135623730951-1.4142135623730951j), (1.4142135623730951+1.4142135623730951j), (1.4142135623730951-1.4142135623730951j), (1.4142135623730951-1.4142135623730951j)]) ################################################## # Blocks @@ -332,8 +332,9 @@ class correlator(gr.top_block, Qt.QWidget): self.epy_block_1 = epy_block_1.blk() self.epy_block_0 = epy_block_0.blk() self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps, timing_loop_bw, rrc_taps, nfilts, 16, 1.5, 1) + self.digital_map_bb_0 = digital.map_bb([0, 1, 3, 2]) self.digital_costas_loop_cc_0 = digital.costas_loop_cc(2 * 3.141592653589793 / 100, 4, False) - self.digital_corr_est_cc_0 = digital.corr_est_cc(access_code_symbols, 1, 0, .8, digital.THRESHOLD_DYNAMIC) + self.digital_corr_est_cc_0 = digital.corr_est_cc(access_code_symbols, 1, len(access_code_symbols) // 2, .9, digital.THRESHOLD_ABSOLUTE) self.digital_constellation_modulator_0 = digital.generic_mod( constellation=const, differential=False, @@ -346,14 +347,15 @@ class correlator(gr.top_block, Qt.QWidget): self.digital_cma_equalizer_cc_0 = digital.cma_equalizer_cc(15, 1, .002, 1) self.channels_channel_model_0 = channels.channel_model( noise_voltage=0.01, - frequency_offset=0.0001, + frequency_offset=0.002, epsilon=1.0, taps=[np.exp(1j * 30 / 180 * np.pi)], noise_seed=243, block_tags=False) self.blocks_vector_source_x_0 = blocks.vector_source_b(testvec * 500, True, 1, []) self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True) - self.blocks_stream_mux_0 = blocks.stream_mux(gr.sizeof_char*1, [5, len(testvec)]) + self.blocks_tagged_stream_align_0 = blocks.tagged_stream_align(gr.sizeof_char*1, 'frame_start') + self.blocks_stream_mux_0 = blocks.stream_mux(gr.sizeof_char*1, [0, len(testvec)]) self.blocks_repack_bits_bb_0 = blocks.repack_bits_bb(2, 8, "", False, gr.GR_MSB_FIRST) self.blocks_null_source_0 = blocks.null_source(gr.sizeof_char*1) self.blocks_null_sink_3 = blocks.null_sink(gr.sizeof_float*1) @@ -367,14 +369,15 @@ class correlator(gr.top_block, Qt.QWidget): self.connect((self.blocks_complex_to_magphase_0_0, 1), (self.blocks_null_sink_3, 0)) self.connect((self.blocks_complex_to_magphase_0_0, 0), (self.qtgui_time_sink_x_0_0, 0)) self.connect((self.blocks_null_source_0, 0), (self.blocks_stream_mux_0, 0)) - self.connect((self.blocks_repack_bits_bb_0, 0), (self.epy_block_1, 0)) + self.connect((self.blocks_repack_bits_bb_0, 0), (self.blocks_tagged_stream_align_0, 0)) self.connect((self.blocks_stream_mux_0, 0), (self.digital_constellation_modulator_0, 0)) + self.connect((self.blocks_tagged_stream_align_0, 0), (self.epy_block_1, 0)) self.connect((self.blocks_throttle_0, 0), (self.digital_pfb_clock_sync_xxx_0, 0)) self.connect((self.blocks_vector_source_x_0, 0), (self.blocks_stream_mux_0, 1)) self.connect((self.channels_channel_model_0, 0), (self.blocks_throttle_0, 0)) self.connect((self.digital_cma_equalizer_cc_0, 0), (self.digital_corr_est_cc_0, 0)) self.connect((self.digital_cma_equalizer_cc_0, 0), (self.qtgui_const_sink_x_0, 0)) - self.connect((self.digital_constellation_decoder_cb_0, 0), (self.blocks_repack_bits_bb_0, 0)) + self.connect((self.digital_constellation_decoder_cb_0, 0), (self.digital_map_bb_0, 0)) self.connect((self.digital_constellation_modulator_0, 0), (self.channels_channel_model_0, 0)) self.connect((self.digital_constellation_modulator_0, 0), (self.qtgui_time_sink_x_1_0, 0)) self.connect((self.digital_corr_est_cc_0, 1), (self.blocks_complex_to_magphase_0_0, 0)) @@ -382,6 +385,7 @@ class correlator(gr.top_block, Qt.QWidget): self.connect((self.digital_corr_est_cc_0, 0), (self.epy_block_0, 0)) self.connect((self.digital_corr_est_cc_0, 0), (self.qtgui_time_sink_x_0_0_0, 0)) self.connect((self.digital_costas_loop_cc_0, 0), (self.qtgui_const_sink_x_0_0, 1)) + self.connect((self.digital_map_bb_0, 0), (self.blocks_repack_bits_bb_0, 0)) self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.digital_cma_equalizer_cc_0, 0)) self.connect((self.epy_block_0, 0), (self.digital_constellation_decoder_cb_0, 0)) self.connect((self.epy_block_0, 0), (self.qtgui_const_sink_x_0_0, 0)) @@ -463,6 +467,7 @@ class correlator(gr.top_block, Qt.QWidget): def set_access_code_symbols(self, access_code_symbols): self.access_code_symbols = access_code_symbols + self.digital_corr_est_cc_0.set_mark_delay(len(self.access_code_symbols) // 2) diff --git a/tests/correlator/epy_block_0.py b/tests/correlator/epy_block_0.py index ddae02a..dbdadd1 100644 --- a/tests/correlator/epy_block_0.py +++ b/tests/correlator/epy_block_0.py @@ -5,6 +5,12 @@ from gnuradio import gr class blk(gr.sync_block): + """ + Apply phase and frequency correction where there is a correlation peak tag. + + The correlation peak tags are NOT propagated, and instead replaced with a + frame_start tag. + """ def __init__(self): gr.sync_block.__init__( self, @@ -22,7 +28,17 @@ class blk(gr.sync_block): self.lastfreq = 0 def block_phase(self, start, end): - # compute number of samples in block + """ + Compute a vector for the phase and frequency correction for the samples + between two tags (start and end). + + @param start Tag where the samples should start to be corrected + @param end Tag where to stop correcting + + @return A vector of phase values for each sample. To correct the samples + the data should be multiplied with np.exp(-1j * phase) + """ + # compute number of samples between tags nsamples = end.offset - start.offset # unpack pmt values into start and end phase @@ -44,10 +60,10 @@ class blk(gr.sync_block): self.lastfreq = freq # debugging - print(f"Correction for block of {nsamples:2d} samples is " \ + print(f"Correction for chunk of {nsamples:2d} samples is " \ f"sphase={sphase: .4f} rad and freq={freq*1e3: .4f} milli rad / sample") - # compute block values + # compute chunk values return sphase * np.ones(nsamples) + freq * np.arange(0, nsamples) def work(self, input_items, output_items): @@ -73,11 +89,11 @@ class blk(gr.sync_block): # compute "the middle" enough_samples = lambda pair: ((pair[1].offset - pair[0].offset) > 0) pairs = list(filter(enough_samples, zip(tags, tags[1:]))) - blocks = [ self.block_phase(start, end) for (start, end) in pairs ] - middle = np.concatenate(blocks) if blocks else [] + chunks = [ self.block_phase(start, end) for (start, end) in pairs ] + middle = np.concatenate(chunks) if chunks else [] # compute values at the end, we do not have informations about the future - # but we can use the frequency of the last block to approximate + # but we can use the frequency of the last tag to approximate nback = len(inp) - (tags[-1].offset - counter) print(f"Processing {nback} samples at the back of the buffer") end = np.ones(nback) * pmt.to_python(tags[-1].value) \ @@ -99,6 +115,10 @@ class blk(gr.sync_block): # save last tag for next call self.last = tags[-1] + # add tags + for tag in tags: + self.add_item_tag(0, tag.offset, pmt.intern("frame_start"), pmt.PMT_T) + # FIXME: should return `length' but then the last sample is not # included and self.last does something weird return len(out) |