channels_dynamic_channel_model.block.yml

id: channels_dynamic_channel_model
label: Dynamic Channel Model

parameters:
-   id: samp_rate
    label: Sample Rate Hz
    dtype: real
    default: samp_rate
-   id: cfo_stdev
    label: CFO Standard Deviation Hz per sample
    dtype: real
    default: '0.01'
-   id: cfo_maxdev
    label: Max CFO Bound Hz
    dtype: real
    default: 1e3
-   id: sro_stdev
    label: SRO Standard Deviation Hz per sample
    dtype: real
    default: '0.01'
-   id: sro_maxdev
    label: Max SRO Bound Hz
    dtype: real
    default: 1e3
-   id: noise_amp
    label: White Noise Amplitude
    dtype: real
    default: '1.0'
-   id: N
    label: Num Sinusoids (SoS model)
    dtype: int
    default: '8'
-   id: fD
    label: Max Doppler Freq (Hz)
    dtype: real
    default: '2.0'
-   id: LOS
    label: LOS Model
    dtype: enum
    options: ['False', 'True']
    option_labels: [Rayleigh/NLOS, Rician/LOS]
    option_attributes:
        hide_K: [all, '']
-   id: K
    label: Rician factor (K)
    dtype: real
    default: '4.0'
    hide: ${ LOS.hide_K }
-   id: seed
    label: Seed
    dtype: int
    default: '0'
-   id: delays
    label: PDP Delays (samp)
    dtype: real_vector
    default: 0.0,0.1,1.3
-   id: mags
    label: PDP Magnitudes
    dtype: real_vector
    default: 1,0.99,0.97
-   id: ntaps
    label: Num Taps
    dtype: int
    default: '8'

inputs:
-   domain: stream
    dtype: complex

outputs:
-   domain: stream
    dtype: complex

templates:
    imports: from gnuradio import channels
    make: |-
        channels.dynamic_channel_model(
            ${samp_rate}, 
            ${sro_stdev}, 
            ${sro_maxdev},
            ${cfo_stdev}, 
            ${cfo_maxdev}, 
            ${N}, 
            ${fD}, 
            ${LOS}, 
            ${K}, 
            ${delays}, 
            ${mags},
            ${ntaps}, 
            ${noise_amp}, 
            ${seed})
    callbacks:
    - set_samp_rate(${samp_rate})
    - set_sro_dev_std(${sro_stdev})
    - set_sro_dev_max(${sro_maxdev})
    - set_cfo_dev_std(${cfo_stdev})
    - set_cfo_dev_max(${cfo_maxdev})
    - set_noise_amp(${noise_amp})
    - set_doppler_freq(${fD})
    - set_K(${K})

documentation: |-
    The dynamic channel model is a hier block consisting of the following effects:
            - Dynamic Frequency Selective Fading Channel
            - Dynamic Center Frequency Offset Model
            - Dynamic Sample Rate Offset Model
            - Additive White Gaussian Noise

        The desired power delay profile and max doppler frequency may be provided to achieve the desired Ricean or Rayleigh fading scenario.   For center frequency and sample rate offset models, a gaussian random walk process is conducted for each.   The single sample step variance and maximum deviation for these two processes is specified and may be modified to simulate various desired stability effects.  Lastly AWGN is added to simulate a typical receiver/thermal noise floor after propagation, and the variance may be modified here as desired.

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