E.8 EVM for category NB1

36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification

E.8.1 Averaged EVM

The general EVM for category NB1 is calculated using the procedure defined in Annex E.4 with the exception that the general EVM is averaged over basic EVM measurements for 240/LCtone slots in the time domain, where LCtone = {1, 3, 6, 12} is the number of subcarriers for the transmission.

E.8.2 EVM of Demodulation reference symbols (EVM_DMRS)

The calculation of the EVM for the demodulation reference symbols for category NB1 follows the procedure defined for DMRS in Annex E.4 with the exception that the basic EVM DMRS measurements are first averaged over 240/ LCtone slots to obtain the intermediate average EVM.

E.8.3 EVM for NPRACH

The calculation of the NPRACH EVM for both formats follows the procedure defined for PRACH in Annex E.6 with the exception that EVM PRACH is averaged over 64 preamble measurements.

E.8.4 Window length for category NB1

The EVM window length, W, for NPUSCH is set to 1 (in FFT samples where the nominal FFT size is 128 for 15 kHz sub-carrier spacing and 512 for 3.75 kHz sub-carrier spacing).

The EVM window length, W, for NPRACH is set to 110 for preamble format 0 and to 494 for preamble format 1 (both in FFT samples where the nominal FFT size is 512).