Just as the title says. I have searched for a whole day and haven't found any confidential materials to verify whether there is a pulse shaping after OFDM modulation in NB-IoT?
For example, in https://www.nxp.com/docs/en/white-paper/3GPPEVOLUTIONWP.pdf in page 15, it mentioned that there is a procedure named, Cyclic prefix and pulse shaping. And the purpose is desripted as "pulse shaping is employed to prevent spectral regrowth.", However, which kind of pulse shaping is unclear.
Besides, I have browsed the referred materials listed in the end of the paper, for most likely references:
- 3GPP TS 36.201 – v1.0.0, LTE Physical Layer – General Description, http://www.3gpp.org/ftp/Specs/archive/36%5Fseries/36.201/
- 3GPP TS 36.211 – v1.0.0, Physical Channels and Modulation, http://www.3gpp.org/ftp/Specs/archive/36%5Fseries/36.211/
- 3GPP TS 36.212 – Multiplexing and Channel Coding, http://www.3gpp.org/ftp/Specs/archive/36%5Fseries/36.212/
- 3GPP TS 36.213 – v1.0.0, Physical Layer Procedures, http://www.3gpp.org/ftp/Specs/archive/36%5Fseries/36.213/
However, there is still no description about the kind of pulse shaping after OFDM modulation. In other words, if I want to send out the NB-IoT signal (which is much similar with LTE) after OFDM modulated, how can I implement it before DAC? Any help would be appreciated!