NI 5442 Baseband Interpolation

NI Signal Generator

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NI 5442
Baseband Interpolation

The following figure shows the behavior of the OSP block during baseband interpolation.

Baseband interpolation allows the OSP block to interpolate signals at a low sample rate up to a high sample rate. Pulse shaping of the data can also be done in the FIR filter. For baseband interpolation, complete the following steps.

  1. Enable onboard signal processing by setting the OSP Enabled property or the NIFGEN_ATTR_OSP_ENABLED attribute.
  2. Specify the use of real numbers for the waveform data by setting the Data Processing Mode property or the NIFGEN_ATTR_OSP_DATA_PROCESSING_MODE attribute.
  3. Set the IQ Rate property or the NIFGEN_ATTR_OSP_IQ_RATE attribute to the low sample rate of the waveform data.
  4. Set the FIR Filter Type property or the NIFGEN_ATTR_OSP_FIR_FILTER_TYPE attribute.
  5. Set the corresponding filter parameter or download a custom set of FIR filter coefficients.
  6. Disable the carrier by setting the Carrier Enabled property or the NIFGEN_ATTR_OSP_CARRIER_ENABLED attribute.
  7. Download the low sample rate waveform(s) to the signal generator.
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