Simplex Link

Simplex links represent the signal processing chain of a unidirectional communication betweeen a transmitting device and a receiving device, implementing the digital signal processing before digital-to-analog conversion and after analog-to-digital conversion, respectively. They are a combination of a Transmitting Modem and a Receiving Modem.

After a SimplexLink is added as a type of Transmitter to a Device, a call to Device.transmit will be delegated to TransmittingModem._transmit(). Similarly, after a SimplexLink is added as a type of Receiver to a Device, a call to Device.receive will be delegated to ReceivingModem._receive()

# Initialize a new simulation considering a single device
simulation = Simulation()
tx_device = simulation.new_device(carrier_frequency=1e10)
rx_device = simulation.new_device(carrier_frequency=1e10)

# Configure the link modeling the devices' transmit DSP
link = SimplexLink(tx_device, rx_device)

# Configure the links's waveform
waveform = RootRaisedCosineWaveform(
    oversampling_factor=4,
    symbol_rate=1e6,
    num_preamble_symbols=16,
    num_data_symbols=32,
    modulation_order=64,
)
link.waveform = waveform

For a detailed description of the transmit and receive routines, refer to the Transmitting Modem and a Receiving Modem of the base classes.

The barebone configuration can be extend by additional components such as Custom Bit Sources, Synchronization, Stream Precoding, Channel Estimation, Symbol Precoding, Channel Equalization and Bit Encoders:

# Configure the link modeling the devices' transmit DSP
link = SimplexLink(tx_device, rx_device)

# Configure the links's waveform
waveform = RootRaisedCosineWaveform(
    oversampling_factor=4,
    symbol_rate=1e6,
    num_preamble_symbols=16,
    num_data_symbols=32,
    modulation_order=64,
)
link.waveform = waveform

# Configure a custom bits source for the modem
link.bits_source = RandomBitsSource(seed=42)

# Configure the waveform's synchronization routine
link.waveform.synchronization = SingleCarrierCorrelationSynchronization()

# Add a custom stream precoding to the modem
link.transmit_stream_coding[0] = ConventionalBeamformer()
link.receive_stream_coding[0] = ConventionalBeamformer()

# Add a custom symbol precoding to the modem
link.precoding[0] = DFT()

# Configure the waveform's channel estimation routine
link.waveform.channel_estimation = SingleCarrierLeastSquaresChannelEstimation()

# Configure the waveform's channel equalization routine
link.waveform.channel_equalization = SingleCarrierZeroForcingChannelEqualization()

# Add forward error correction encodings to the transmitted bit stream
link.encoder_manager.add_encoder(RepetitionEncoder(32, 3))
link.encoder_manager.add_encoder(BlockInterleaver(192, 32))

class SimplexLink(transmitting_device, receiving_device, *args, bits_source=None, selected_transmit_ports=None, selected_receive_ports=None, **kwargs)

Bases: TransmittingModem, ReceivingModem

Convenience class to manage a simplex communication link between two dedicated devices.

Parameters:

• transmitting_device (Device) – Transmitting device.

• receiving_device (Device) – Receiving device.

• bits_source (BitsSource, optional) – Source configuration of communication bits transmitted by this modem. Bits are randomly generated by default.

• selected_transmit_ports (Sequence[int] | None) – Indices of antenna ports selected for transmission from the operated Device's antenna array. If not specified, all available ports will be considered.

• selected_receive_ports (Sequence[int] | None) – Indices of antenna ports selected for reception from the operated Device's antenna array. If not specified, all available ports will be considered.

• *args – Modem initialization parameters. Refer to TransmittingModem and ReceivingModem for further details.

• **kwargs – Modem initialization parameters. Refer to TransmittingModem and ReceivingModem for further details.

property receiving_device: Device

The receiving device.

Returns: Device handle.

property reference: Device | None

Reference transmitter for this receiver.

Returns:

A handle to the referenced device. None if the device was not specified.

property transmitting_device: Device

The transmitting device.

Returns: Device handle.

yaml_tag: Optional[str] = 'SimplexLink'

YAML serialization tag