W.-C. ChenC.-D. ChungCHAR-DIR CHUNG2019-10-312019-10-312017906778https://scholars.lib.ntu.edu.tw/handle/123456789/430216Spectrally efficient OFDM pilot waveform for channel estimationjournal article10.1109/tcomm.2016.26168592-s2.0-85010002236