I have a question on CP-OFDM. In recent years people are talking about filter bank approach where they are trying to filter out the out of band side lobes using filters. Besides they are presuming that this approach may provide some robustness and spectral efficiency since they can get rid of CP. Is this true and what aspects we can remove CP and make spectral efficiency equal one.
Ref. F. Schaich, T. Wild, Y. Chen , „Waveform contenders for 5G – suitability for short packet and low latency transmissions“, accepted for IEEE VTCs’14, Seoul, Korea, April 2014