GR-MCP

# BPSK Transceiver Template
# BPSK modulation/demodulation with channel simulation

id: bpsk_transceiver
name: BPSK Transceiver
description: BPSK modulation and demodulation with AWGN channel for testing
category: digital

default_params:
  sample_rate: "32000"
  symbol_rate: "1000"
  samples_per_symbol: "4"
  snr_db: "10"
  noise_voltage: "0.1"
  freq_offset: "0"

blocks:
  # Variables
  - type: variable
    name: samp_rate
    params:
      value: "${sample_rate}"

  - type: variable
    name: sps
    params:
      value: "${samples_per_symbol}"

  - type: variable
    name: snr_db
    params:
      value: "${snr_db}"

  # Random data source
  - type: analog_random_source_x
    name: data_source
    params:
      type: byte
      min: "0"
      max: "2"
      num_samps: "1000"
      repeat: "True"

  # Throttle
  - type: blocks_throttle
    name: throttle
    role: throttle
    params:
      type: byte
      samples_per_sec: "samp_rate / sps"

  # BPSK constellation
  - type: digital_constellation_encoder_bc
    name: bpsk_mod
    params:
      constellation: digital.constellation_bpsk().base()

  # Pulse shaping (RRC filter)
  - type: interp_fir_filter_xxx
    name: tx_filter
    params:
      type: ccf
      interp: sps
      taps: firdes.root_raised_cosine(1.0, samp_rate, samp_rate/sps, 0.35, 11*sps)

  # Channel model - add noise
  - type: channels_channel_model
    name: channel
    params:
      noise_voltage: "${noise_voltage}"
      frequency_offset: "${freq_offset}"
      epsilon: "1.0"
      taps: "[1.0]"
      noise_seed: "0"

  # Matched filter (RRC)
  - type: fir_filter_xxx
    name: rx_filter
    params:
      type: ccf
      decim: "1"
      taps: firdes.root_raised_cosine(1.0, samp_rate, samp_rate/sps, 0.35, 11*sps)

  # Symbol timing recovery (Polyphase clock sync)
  - type: digital_symbol_sync_xx
    name: clock_sync
    params:
      type: cc
      sps: sps
      loop_bw: "0.045"
      ted_type: digital.TED_MUELLER_AND_MULLER
      damping: "1.0"
      max_deviation: "1.5"
      expected_ted_gain: "1.0"
      interp_type: digital.IR_MMSE_8TAP
      n_filters: "128"
      taps: "[]"

  # Constellation decoder
  - type: digital_constellation_decoder_cb
    name: bpsk_demod
    params:
      constellation: digital.constellation_bpsk().base()

  # Output sink
  - type: blocks_null_sink
    name: data_sink
    params:
      type: byte
      vlen: "1"

  # Optional: BER measurement blocks can be added

connections:
  - src_block: data_source
    src_port: "0"
    sink_block: throttle
    sink_port: "0"

  - src_block: throttle
    src_port: "0"
    sink_block: bpsk_mod
    sink_port: "0"

  - src_block: bpsk_mod
    src_port: "0"
    sink_block: tx_filter
    sink_port: "0"

  - src_block: tx_filter
    src_port: "0"
    sink_block: channel
    sink_port: "0"

  - src_block: channel
    src_port: "0"
    sink_block: rx_filter
    sink_port: "0"

  - src_block: rx_filter
    src_port: "0"
    sink_block: clock_sync
    sink_port: "0"

  - src_block: clock_sync
    src_port: "0"
    sink_block: bpsk_demod
    sink_port: "0"

  - src_block: bpsk_demod
    src_port: "0"
    sink_block: data_sink
    sink_port: "0"