?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=T&rft.au=Xu%2C+T&rft.aulast=Xu&rft.issn=2327-4662&rft.atitle=Waveform+and+Space+Precoding+for+Next+Generation+Downlink+Narrowband+IoT&rft.date=31+January+2019&rft.title=IEEE+Internet+of+Things+Journal&rft.genre=article