USRP Device

class UsrpDevice(ip, port=5555, carrier_frequency=700000000.0, sampling_rate=None, tx_gain=0.0, rx_gain=0.0, scale_transmission=True, num_prepended_zeros=200, num_appended_zeros=200, selected_transmit_ports=None, selected_receive_ports=None, **kwargs)

Bases: PhysicalDevice[PhysicalDeviceState], Serializable

Bindung to a USRP device via the UHD library.

Parameters:

• ip (str) – The IP address of the USRP device.

• port (int) – The port of the USRP device.

• carrier_frequency (float) – Carrier frequency of the USRP device. \(700~\mathrm{MHz}\) by default.

• sampling_rate (float | None) – Sampling rate of the USRP device. If not provided, the sampling rate is determined from the configured operators.

• tx_gain (float) – The transmission gain of the USRP device. Zero by default.

• rx_gain (float) – The reception gain of the USRP device. Zero by default.

• scale_transmission (bool) – If True, the transmission signal is scaled to the maximum floating point value of the USRP device. This ensures a proper digital to analog conversion.

• num_prepended_zeros (int) – The number of zeros prepended to the transmission signal. \(200\) by default.

• num_appended_zeros (int) – The number of zeros appended to the transmission signal. \(200\) by default.

• selected_transmit_ports (Sequence[int] | None) – Indices of the selected transmit antenna ports. If not specified, i.e. None, only the first antenna port is selected.

• selected_receive_ports (Sequence[int] | None) – Indices of the selected receive antenna ports. If not specified, i.e. None, only the first antenna port is selected.

• **kwargs – Additional arguments passed to the PhysicalDevice parent class.

classmethod Deserialize(process)

Deserialize an object’s state.

Objects cannot be deserialized directly, instead a Factory must be instructed to carry out the deserialization process.

Parameters:

process (DeserializationProcess) – The current stage of the deserialization process. This object is generated by the Factory and provides an interface to deserialization methods supporting multiple backends.

Return type:

UsrpDevice

Returns:

The deserialized object.

serialize(process)

Serialize this object’s state.

Objects cannot be serialized directly, instead a Factory must be instructed to carry out the serialization process.

Parameters:

process (SerializationProcess) – The current stage of the serialization process. This object is generated by the Factory and provides an interface to serialization methods supporting multiple backends.

Return type:

None

state()

Query the immutable physical state of the device.

Returns: The physical device state.

Return type:

PhysicalDeviceState

trigger()

Trigger the device.

Return type:

None

property antennas: UsrpAntennas

Antenna array model of the USRP device.

Allows for the further configuration of the antenna elements, however, the number of transmit ports and receive ports is fixed.

property carrier_frequency: float

Central frequency of the device’s emissions in the RF-band.

Denoted by \(f_c\) with unit \(\left[ f_c \right] = \mathrm{Hz} = \tfrac{1}{\mathrm{s}}\) in the literature.

Raises:

ValueError – On negative carrier frequencies.

property ip: str

Internet protocol address of the remote host.

Returns:

IP adress.

property max_sampling_rate: float

Maximal device sampling rate.

Returns: The samplin rate in Hz.

property num_appended_zeros: int

Number of zero padding samples appended to the transmitted signal.

Returns: Number of appended samples.

Raises:

ValueError – For negative values.

property num_prepeneded_zeros: int

Number of zero padding samples prepended to the transmitted signal.

Returns: Number of prepended samples.

Raises:

ValueError – For negative values.

property num_receive_antenna_ports: int

Number of receive ports controlled on the USRP device.

property num_transmit_antenna_ports: int

Number of transmit ports controlled on the USRP device.

property port: int

Internet protocol port of the remote host.

Returns:

Port.

property rx_gain: float

Gain of the receiving front-end in dB.

property sampling_rate: float

Sampling rate at which the device’s analog-to-digital converters operate in Hz.

Raises:

ValueError – If the sampling rate is not greater than zero.

property scale_transmission: bool

Indicates whether the transmission is scaled to the full DAC range.

Returns: Boolean enabled flag.

property selected_receive_ports: Sequence[int]

Indices of the selected receive ports.

property selected_transmit_ports: Sequence[int]

Indices of the selected transmit ports.

property tx_gain: float

Gain of the transmitting front-end in dB.

class UsrpAntennas(device, pose=None)

Bases: AntennaArray[AntennaPort, Antenna]

Antenna and port configuration of a USRP device.

UsrpAntennas’ port configuration is linked to the attached :class`UsrpDevice` and cannot be changed manually.

Parameters:

• device (UsrpDevice) – USRP device this antenna array models.

• pose (Transformation | None) – Pose of the antenna array with respect to the device.

property device: UsrpDevice

USRP device the antenna array is attached to.

property num_ports: int

Number of antenna ports within this array.

property num_receive_antennas: int

Number of receiving antenna elements within this array.

property num_receive_ports: int

Number of receiving antenna ports within this array.

property num_transmit_antennas: int

Number of transmitting antenna elements within this array.

property num_transmit_ports: int

Number of transmitting antenna ports within this array.

property ports: Sequence[AntennaPort]

Sequence of all antenna ports within this array.

property receive_ports: Sequence[AntennaPort]

Sequence of all receiving ports within this array.

property transmit_ports: Sequence[AntennaPort]

Sequence of all transmitting ports within this array.