BBC over OOK with a Jammer

BBC over OOK, recovered while a stronger jammer floods the channel with marks.
Author James Morrison
Category gr-bbc
Blocks 24
Connections 13
File gr-bbc/bbc_ook_jammed.grc
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Blocks used

Block	Module	Used
Variable	`GNU Radio`	10
OOK Modulator	`gr-bbc`	2
Vector Source	`GNU Radio`	2
Add	`GNU Radio`	1
BBC Decoder	`gr-bbc`	1
BBC Encoder	`gr-bbc`	1
Head	`GNU Radio`	1
Message Debug	`GNU Radio`	1
Multiply Const	`GNU Radio`	1
Null Sink	`GNU Radio`	1
OOK Demodulator	`gr-bbc`	1
Stream to Vector	`GNU Radio`	1
Vector to Stream	`GNU Radio`	1
Flowgraph source

gr-bbc/bbc_ook_jammed.grc
options:
  parameters:
    author: James Morrison
    catch_exceptions: 'True'
    category: '[GRC Hier Blocks]'
    cmake_opt: ''
    comment: ''
    copyright: ''
    description: BBC over OOK, recovered while a stronger jammer floods the channel
      with marks.
    gen_cmake: 'On'
    gen_linking: dynamic
    generate_options: no_gui
    hier_block_src_path: '.:'
    id: bbc_ook_jammed
    max_nouts: '0'
    output_language: python
    placement: (0,0)
    qt_qss_theme: ''
    realtime_scheduling: ''
    run: 'True'
    run_command: '{python} -u {filename}'
    run_options: run
    sizing_mode: fixed
    thread_safe_setters: ''
    title: BBC over OOK with a Jammer
    window_size: ''
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [10, 10]
    rotation: 0
    state: enabled

blocks:
- name: CHECKSUM_BITS
  id: variable
  parameters:
    comment: ''
    value: '32'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [600, 10]
    rotation: 0
    state: enabled
- name: CODEWORD_LENGTH
  id: variable
  parameters:
    comment: 128x expansion over the message.
    value: '1024'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [820, 10]
    rotation: 0
    state: enabled
- name: MESSAGE_LENGTH
  id: variable
  parameters:
    comment: ''
    value: '8'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1070, 10]
    rotation: 0
    state: enabled
- name: NUM_CODEWORDS
  id: variable
  parameters:
    comment: The demodulator drops the filter warm-up, so the last codeword is
      always short. Send a few.
    value: '3'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1300, 10]
    rotation: 0
    state: enabled
- name: carrier_freq
  id: variable
  parameters:
    comment: Baseband offset, not an RF frequency.
    value: 20e3
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1540, 10]
    rotation: 0
    state: enabled
- name: jam_amplitude
  id: variable
  parameters:
    comment: 1.0 means the jammer is as strong as the signal. Try turning it up.
    value: '1.0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [10, 170]
    rotation: 0
    state: enabled
- name: jam_bytes
  id: variable
  parameters:
    comment: Pseudo-random keying, so the jammer sprays marks across the codeword.
    value: '[0x0d, 0xb4, 0x5b, 0x02] * 1024'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [210, 170]
    rotation: 0
    state: enabled
- name: message
  id: variable
  parameters:
    comment: Hex bytes, matching Message Debug's display.
    value: '[0x47, 0x52, 0x43, 0x6f, 0x6e, 0x32, 0x36, 0x21]'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [490, 170]
    rotation: 0
    state: enabled
- name: samp_rate
  id: variable
  parameters:
    comment: ''
    value: 128e3
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [770, 170]
    rotation: 0
    state: enabled
- name: symbol_rate
  id: variable
  parameters:
    comment: ''
    value: '8000'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [940, 170]
    rotation: 0
    state: enabled
- name: blocks_vector_source_x_0
  id: blocks_vector_source_x
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    repeat: 'True'
    tags: '[]'
    type: byte
    vector: message
    vlen: MESSAGE_LENGTH
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [10, 270]
    rotation: 0
    state: enabled
- name: bbc_bbc_encoder_0
  id: bbc_bbc_encoder
  parameters:
    affinity: ''
    alias: ''
    checksum_length: CHECKSUM_BITS
    codeword_length: CODEWORD_LENGTH
    comment: ''
    maxoutbuf: '0'
    message_length: MESSAGE_LENGTH
    minoutbuf: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [360, 270]
    rotation: 0
    state: enabled
- name: blocks_head_0
  id: blocks_head
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    num_items: NUM_CODEWORDS
    type: byte
    vlen: CODEWORD_LENGTH
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [800, 290]
    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: CODEWORD_LENGTH
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1150, 290]
    rotation: 0
    state: enabled
- name: bbc_OOKModulator_0
  id: bbc_OOKModulator
  parameters:
    affinity: ''
    alias: ''
    carrier_freq: carrier_freq
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    samp_rate: samp_rate
    symbol_rate: symbol_rate
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [80, 550]
    rotation: 0
    state: enabled
- name: blocks_vector_source_x_1
  id: blocks_vector_source_x
  parameters:
    affinity: ''
    alias: ''
    comment: Jammer payload
    maxoutbuf: '0'
    minoutbuf: '0'
    repeat: 'True'
    tags: '[]'
    type: byte
    vector: jam_bytes
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [800, 390]
    rotation: 0
    state: enabled
- name: bbc_OOKModulator_1
  id: bbc_OOKModulator
  parameters:
    affinity: ''
    alias: ''
    carrier_freq: carrier_freq
    comment: Jammer, same channel
    maxoutbuf: '0'
    minoutbuf: '0'
    samp_rate: samp_rate
    symbol_rate: symbol_rate
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1150, 390]
    rotation: 0
    state: enabled
- name: blocks_multiply_const_vxx_0
  id: blocks_multiply_const_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    const: jam_amplitude
    maxoutbuf: '0'
    minoutbuf: '0'
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [80, 690]
    rotation: 0
    state: enabled
- name: blocks_add_xx_0
  id: blocks_add_xx
  parameters:
    affinity: ''
    alias: ''
    comment: The Z channel - a jammer can add marks but never remove them.
    maxoutbuf: '0'
    minoutbuf: '0'
    num_inputs: '2'
    type: complex
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [420, 570]
    rotation: 0
    state: enabled
- name: bbc_OOKDemodulator_0
  id: bbc_OOKDemodulator
  parameters:
    affinity: ''
    alias: ''
    bandwidth: '0'
    carrier_freq: carrier_freq
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    samp_rate: samp_rate
    symbol_rate: symbol_rate
    threshold: '0.25'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [660, 560]
    rotation: 0
    state: enabled
- name: blocks_stream_to_vector_0
  id: blocks_stream_to_vector
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    num_items: CODEWORD_LENGTH
    type: byte
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [990, 580]
    rotation: 0
    state: enabled
- name: bbc_bbc_decoder_0
  id: bbc_bbc_decoder
  parameters:
    affinity: ''
    alias: ''
    checksum_length: CHECKSUM_BITS
    codeword_length: CODEWORD_LENGTH
    comment: ''
    max_candidates: '256'
    max_steps: '5000000'
    maxoutbuf: '0'
    message_length: MESSAGE_LENGTH
    minoutbuf: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1280, 560]
    rotation: 0
    state: enabled
- name: blocks_message_debug_0
  id: blocks_message_debug
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    en_uvec: 'True'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [130, 810]
    rotation: 0
    state: enabled
- name: blocks_null_sink_0
  id: blocks_null_sink
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    type: byte
    vlen: MESSAGE_LENGTH
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [130, 990]
    rotation: 0
    state: enabled

connections:
- [bbc_OOKDemodulator_0, '0', blocks_stream_to_vector_0, '0']
- [bbc_OOKModulator_0, '0', blocks_add_xx_0, '0']
- [bbc_OOKModulator_1, '0', blocks_multiply_const_vxx_0, '0']
- [bbc_bbc_decoder_0, '0', blocks_null_sink_0, '0']
- [bbc_bbc_decoder_0, decoded, blocks_message_debug_0, print]
- [bbc_bbc_encoder_0, '0', blocks_head_0, '0']
- [blocks_add_xx_0, '0', bbc_OOKDemodulator_0, '0']
- [blocks_head_0, '0', blocks_vector_to_stream_0, '0']
- [blocks_multiply_const_vxx_0, '0', blocks_add_xx_0, '1']
- [blocks_stream_to_vector_0, '0', bbc_bbc_decoder_0, '0']
- [blocks_vector_source_x_0, '0', bbc_bbc_encoder_0, '0']
- [blocks_vector_source_x_1, '0', bbc_OOKModulator_1, '0']
- [blocks_vector_to_stream_0, '0', bbc_OOKModulator_0, '0']

metadata:
  file_format: 1
  grc_version: 3.10.9.2