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Design Notes

LTE and NB-IoT Uplink Coexistence RX Test Bench

This example demonstrates performance of LTE UL coexisting with NB-IoT uplink signal, NPUSCH format 1, compliant with 3GPP Release 13 specification.

Configuration options include:

• Carrier frequency (in MHz). Both LTE and NB-IoT are defined with respect to the same carrier frequency.

• LTE transmit power sweep for BER and throughput test (TxOutLvlStart_dBm, TxOutLvlSpan_dBm, TxOutLvlStep_dBm). NBIoT_TxOutLvl_dBm specifies the total transmit power of NB-IoT signal.

•NB-IoT-TSIG block can be disabled/enabled to look at LTE UL performance without/with NB-IoT. The reference LTE BER and throughput curves are taken with NB-IoT-TSIG block turned off. 

• 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

•NB-IoT subcarrier assignment when NBIoT_SCMode is 0 or 1 (NBIoT_SCAssign)

•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

•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

• LTE link performance in the presence of NB-IoT signal

• IQ constellation of the transmitted and demodulated signals

• Bit error rate (BER), block error rate (BLER), and throughput

• CRC error for each block

NB-IoT 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

See also LTE_UL_FDD_RX_Testbench example.

System Diagram - LTE and NB IoT

Graph - LTE_NBIoT_Spectrum

Graph - LTE_BER

Graph - LTE_Throughput