Radio Impairments on a Tone

A clean tone through gr-channels' Radio Impairments Model, every knob a live control. IQ imbalance raises an image at the mirror frequency, DC offset a spike at the carrier, the distortion orders put harmonics on the spectrum, and phase noise smears the skirt.
Author Marc
Category Channel Models
Blocks 15
Connections 4
File channels/radio_impairments.grc
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Blocks used

Block	Module	Used
QT GUI Range	`GNU Radio`	8
GUI Layout	`GNU Radio`	1
HW Impairments	`GNU Radio`	1
QT GUI Constellation Sink	`GNU Radio`	1
QT GUI Frequency Sink	`GNU Radio`	1
Signal Source	`GNU Radio`	1
Throttle	`GNU Radio`	1
Variable	`GNU Radio`	1
Flowgraph source

channels/radio_impairments.grc
options:
    parameters:
        author: Marc
        comment: ''
        copyright: ''
        description: A clean tone through gr-channels' Radio Impairments Model, every knob a live control. IQ imbalance raises an image at the mirror frequency, DC offset a spike at the carrier, the distortion orders put harmonics on the spectrum, and phase noise smears the skirt.
        generate_options: qt_gui
        id: Radio_Impairments_on_a_Tone
        title: Radio Impairments on a Tone
    states:
        coordinate: [10, 10]
        rotation: 0
        state: enabled
blocks:
-   name: beta
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: 3rd-order distortion
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '0'
        step: '0.01'
        stop: '0.5'
        value: '0.05'
        widget: counter_slider
    states:
        coordinate: [1180, 300]
        rotation: 0
        state: enabled
-   name: dc_i
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: DC offset I
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '-0.5'
        step: '0.01'
        stop: '0.5'
        value: '0.05'
        widget: counter_slider
    states:
        coordinate: [1340, 10]
        rotation: 0
        state: enabled
-   name: dc_q
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: DC offset Q
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '-0.5'
        step: '0.01'
        stop: '0.5'
        value: '0'
        widget: counter_slider
    states:
        coordinate: [10, 300]
        rotation: 0
        state: enabled
-   name: freq_offset
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: Frequency offset (normalized)
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '-0.1'
        step: '0.001'
        stop: '0.1'
        value: '0.01'
        widget: counter_slider
    states:
        coordinate: [300, 300]
        rotation: 0
        state: enabled
-   name: gamma
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: 2nd-order distortion
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '0'
        step: '0.01'
        stop: '0.5'
        value: '0.05'
        widget: counter_slider
    states:
        coordinate: [890, 300]
        rotation: 0
        state: enabled
-   name: magbal
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: IQ magnitude imbalance (dB)
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '-6'
        step: '0.1'
        stop: '6'
        value: '1'
        widget: counter_slider
    states:
        coordinate: [760, 10]
        rotation: 0
        state: enabled
-   name: phase_noise
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: Phase noise (dB)
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '-60'
        step: '1'
        stop: '0'
        value: '-30'
        widget: counter_slider
    states:
        coordinate: [600, 300]
        rotation: 0
        state: enabled
-   name: phasebal
    id: variable_qtgui_range
    parameters:
        comment: ''
        label: IQ phase imbalance (deg)
        min_len: '240'
        orient: QtCore.Qt.Horizontal
        rangeType: float
        start: '-30'
        step: '0.5'
        stop: '30'
        value: '10'
        widget: counter_slider
    states:
        coordinate: [1050, 10]
        rotation: 0
        state: enabled
-   name: samp_rate
    id: variable
    parameters:
        comment: ''
        value: '32000'
    states:
        coordinate: [590, 10]
        rotation: 0
        state: enabled
-   name: constellation
    id: qtgui_const_sink_x
    parameters:
        affinity: ''
        alias: ''
        alpha1: '1'
        alpha10: '1'
        alpha2: '1'
        alpha3: '1'
        alpha4: '1'
        alpha5: '1'
        alpha6: '1'
        alpha7: '1'
        alpha8: '1'
        alpha9: '1'
        autoscale: 'False'
        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: ''
        grid: 'False'
        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: Impaired tone in the IQ plane
        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'
        tr_mode: qtgui.TRIG_MODE_FREE
        tr_slope: qtgui.TRIG_SLOPE_POS
        tr_tag: ''
        update_time: '0.1'
        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: [1080, 700]
        rotation: 0
        state: enabled
-   name: impairments
    id: channels_impairments
    parameters:
        affinity: ''
        alias: ''
        beta: beta
        comment: ''
        freq_offset: freq_offset
        gamma: gamma
        i_ofs: dc_i
        magbal: magbal
        maxoutbuf: '0'
        minoutbuf: '0'
        phase_noise_mag: phase_noise
        phasebal: phasebal
        q_ofs: dc_q
    states:
        coordinate: [690, 500]
        rotation: 0
        state: enabled
-   name: spectrum
    id: qtgui_freq_sink_x
    parameters:
        affinity: ''
        alias: ''
        alpha1: '1'
        alpha10: '1'
        alpha2: '1'
        alpha3: '1'
        alpha4: '1'
        alpha5: '1'
        alpha6: '1'
        alpha7: '1'
        alpha8: '1'
        alpha9: '1'
        autoscale: 'False'
        average: '0.2'
        axislabels: 'True'
        bw: samp_rate
        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'
        fc: '0'
        fftsize: '2048'
        freqhalf: 'True'
        grid: 'True'
        label: Relative Gain
        label1: ''
        label10: ''
        label2: ''
        label3: ''
        label4: ''
        label5: ''
        label6: ''
        label7: ''
        label8: ''
        label9: ''
        legend: 'True'
        marker1: '-1'
        marker10: '-1'
        marker2: '-1'
        marker3: '-1'
        marker4: '-1'
        marker5: '-1'
        marker6: '-1'
        marker7: '-1'
        marker8: '-1'
        marker9: '-1'
        maxoutbuf: '0'
        minoutbuf: '0'
        name: 'Impaired tone: image, DC, harmonics and noise skirt'
        nconnections: '1'
        norm_window: '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_level: '0'
        tr_mode: qtgui.TRIG_MODE_FREE
        tr_tag: ''
        type: complex
        units: dB
        update_time: '0.1'
        width1: '1'
        width10: '1'
        width2: '1'
        width3: '1'
        width4: '1'
        width5: '1'
        width6: '1'
        width7: '1'
        width8: '1'
        width9: '1'
        wintype: window.WIN_RECTANGULAR
        ymax: '10'
        ymin: '-100'
    states:
        coordinate: [1080, 520]
        rotation: 0
        state: enabled
-   name: throttle
    id: blocks_throttle2
    parameters:
        affinity: ''
        alias: ''
        comment: ''
        ignoretag: 'True'
        limit: auto
        maximum: '0.1'
        maxoutbuf: '0'
        minoutbuf: '0'
        samples_per_second: samp_rate
        type: complex
        vlen: '1'
    states:
        coordinate: [360, 540]
        rotation: 0
        state: enabled
-   name: tone
    id: analog_sig_source_x
    parameters:
        affinity: ''
        alias: ''
        amp: '0.7'
        comment: ''
        freq: '2000'
        maxoutbuf: '0'
        minoutbuf: '0'
        offset: '0'
        phase: '0'
        samp_rate: samp_rate
        type: complex
        waveform: analog.GR_COS_WAVE
    states:
        coordinate: [10, 520]
        rotation: 0
        state: enabled
-   name: wasm_gui_layout_0
    id: wasm_gui_layout
    parameters:
        affinity: ''
        alias: ''
        columns: '12'
        comment: ''
        layout: '{}'
        row_height: '60'
    states:
        coordinate: [300, 10]
        rotation: 0
        state: enabled
connections:
- [impairments, '0', constellation, '0']
- [impairments, '0', spectrum, '0']
- [throttle, '0', impairments, '0']
- [tone, '0', throttle, '0']
metadata:
    file_format: 1
    grc_version: 3.11.0.0