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Design Notes
NB-IoT Uplink eNB RX Test Bench
This example demonstrates operation of NB-IoT in the guardband of an LTE signal. The NB-IoT uplink signal is configured as NPUSCH format 1, compliant with 3GPP Release 13 specification.
Configuration options include:
- Carrier frequency (in MHz)
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- Transmit power sweep for BER and throughput test (TxOutLvlStart_dBm, TxOutLvlSpan_dBm, TxOutLvlStep_dBm).
- The TxOutLvl parameters are specified for "total transmit power". The BER plot, however,
- uses derived "per-subcarrier power" in the x-axis so that the BER performance of various
- subcarrier modes can be compared.
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- NB-IoT subcarrier mode (NBIoT_SCMode)
- 0: 3.75kHz single tone (use NBIoT_SCAssign parameter to specify between 0-47)
- 1: 15kHz single tone (use NBIoT_SCAssign parameter to specify between 0-11)
- 2-5: 15kHz three tone {0,1,2}, {3,4,5}, {6,7,8}, or {9,10,11}
- 6,7: 15kHz six tone {0,1,...,5} or {6,7,..., 11}
- 8: 15kHz with twelve tone
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- NB-IoT subcarrier assignment when NBIoT_SCMode is 0 or 1 (NBIoT_SCAssign)
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- NB-IoT resource block location (NBIoT_RB)
- - Use NBIoT_RB<0 or NBIoT_RB>N_RB_UL for guard band operation
- - Use NBIoT_RB between 0 and N_RB_UL for in-band operation
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- NB-IoT modulation type (NBIoT_ModType)
- - Supports pi/2-BPSK or pi/4-QPSK (rotated)
The test bench can be used to monitor:
- The TX signal spectrum at various points in the link
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- NB-IoT link performance in the presence of LTE UL signal
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- IQ constellation of the transmitted and demodulated signals
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- Bit error rate (BER), block error rate (BLER), and throughput
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- CRC error for each block
References:
TS 36.211 Release 13, Chapter 10
TS 36.212 Release 13, Chapter 6
TS 36.213 Release 13, Chapter 16
TS 36.104 Release 13.5, Appendix A.16 Fixed Reference Channels for NB-IoT NPUSCH Format 1
System Diagram - NB IoT Testbench
Graph - NBIoT and LTE Spectra
Graph - NBIoT Throughput
Graph - NBIoT BER