GNURadio LimeSuiteNG blocks

Gnuradio-limesuiteng plugin provides sink and source blocks that can be used in GNURadio GUI to interact with selected LimeSDR devices. Once installed the blocks will appear in GNURadio UI on right side of application window in drop down menu as show in the image below.

Drag and drop or double click on block title to add it to GNURadio flow graph. Connect the LimeSuiteNG Sink or Source block’s input/output to other blocks of your choice.

LimeSuiteNG Source block

LimeSuiteNG Source block is used to set up selected LimeSDR device RX channel. To configure source block, double click it to open the configuration window. Once the GNURadio flow graph is executed, block outputs digitized data sample stream that must be redirected to other GNURadio blocks for further processing or display.

Configurable parameters of General tab are provided in the table below:

Configurable parameters	Description
Type	Sampled and digitized data type.
Custom config file	LMS7002M .ini configuration file.
Device Handle	Serial number required to identify selected LimeSDR device. Auto selected when a single LimeSDR device is present in system.
LO Frequency	Local oscillator/center/carrier frequency in Hz. See Device support list for supported frequencies of individual boards.
Sample Rate	Sampling rate of received RF signal. See Device support list for supported sample rates of individual boards.
RF Oversampling	ADC decimation compared to IQ sample rate. Specifies required amount of samples to produce a single sample in the output.
NCO offset	Numerically controled oscillator frequency offset in Hz.
Low Pass Filter	Low pass filter cutoff frequency in Hz.
GFIR filter	General Finite Impulse Response filter cutoff frequency in Hz.
Antenna port	By default antenna port is selected automatically based on set LO Frequency option.
Data channel indexes	Index(es) of antenna(s) to use for data retrieval. Antenna indexes start from 0. To use a single antenna specify index [0]. If selected LimeSDR device has multiple RX antennas, specify indexes of all required antennas. For example: [0, 1, 2] or [0, 1] (if you want to use only the 2/3 antennas).
Gain (dB)	Generic device chip gain adjustment. Gain range is auto clamped.
Calibrate DC & IQ	Calibrates Rx DC & IQ imbalance.

Configurable parameters of LMS7002M Advanced tab are provided in the table below:

Configurable parameters	Description
LMS7002M Rx Gains override	Overrides pre-programmed RX channel gains options.
RX LNA	Overrides RX Low Noise Amplifier gain setting.
RX PGA	Overrides RX Programmable Gain Amplifier gain setting.
RX TIA	Overrides RX Transimpedance Amplifier gain setting.

LimeSuiteNG Sink block

LimeSuiteNG Sink block is used to set up selected LimeSDR device TX channel. To configure sink block, double click it to open the configuration window. Once the GNURadio flow graph is executed, block collects digitized data samples from other GNURadio blocks and sends data to LimeSDR device for transmission.

Configurable parameters of General tab are provided in the table below:

Configurable parameters	Description
Type	Sampled and digitized data type.
Custom config file	LMS7002M .ini configuration file.
Device Handle	Serial number required to identify selected LimeSDR device. Auto selected when a single LimeSDR device is present in system.
LO Frequency	Local oscillator/center/carrier frequency in Hz. See Device support list for supported frequencies of individual boards.
Sample Rate	Sampling rate of transmission signal. See Device support list for supported sample rates of individual boards.
RF Oversampling	DAC interpolation compared to IQ sample rate. Specifies how many new samples to add between the two nearest input samples.
NCO offset	Numerically controled oscillator frequency offset in Hz.
Low Pass Filter	Low pass filter cutoff frequency in Hz.
GFIR filter	General Finite Impulse Response filter cutoff frequency in Hz.
Antenna port	By default antenna port is selected automatically based on set LO Frequency option.
Data channel indexes	Index(es) of antenna(s) to use for data transmission. Antenna indexes start from 0. To use a single antenna specify index [0]. If selected LimeSDR device has multiple TX antennas, specify indexes of all required antennas. For example: [0, 1, 2] or [0, 1] (if you want to use only the 2/3 antennas).
Gain (dB)	Generic device chip gain adjustment. Gain range is auto clamped.
Calibrate DC & IQ	Calibrates Tx DC & IQ imbalance.