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Where To Find This Example

AWR Version 15

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AWR Version 14

This example is not available for AWR Version 14 or earlier.

Design Notes

NR FDD Downlink TX Test Bench

This example demonstrates an NR FDD Downlink transmitter test bench, compliant with the 3GPP 38 series specifications. The test bench allows user to configure the NR downlink signal source and device under test (DUT). The receiver is configured automatically to match the settings used in the transmitter.

Some of the signal parameters that the user can change include:

- Signal level, TxOutLvl_dBm, which is swept by the VSA.EVM block

- Number of resource blocks, N_RB_DL

- Carrier Frequency (MHz)

- Subcarrier spacing as allowed by NR specification

- Modulation and coding scheme, MCS, and the corresponding table, MTBST, as specified in the NR specifications

- Oversampling rate used in the simulation, OVRSMP

- PDCCH mode to select whether PDCCH occupies the first symbol of a slot or two symbols.

- Synchronization signal block (SSB) and it's subcarrier spacing

The test bench can be used to monitor various measurements. The following measurements are predefined:

- The CCDF at the input and output of DUT

- The TX signal spectrum at the input and output of DUT

- EVM %rms vs. output power, per resource block, and per subcarrier

- The impact of phase noise on EVM

- The impact of phase/amplitude and DC offset on EVM

- ACPR

- AM to AM characteristics of the DUT