Flexibility through hybrid waveforms

In search of a flexible waveform, this chapter starts by manipulating orthogonal frequency division multiplexing (OFDM) into being more flexible to further optimize time and frequency localization to facilitate a better coexistence of different, more advanced numerologies. Dissatisfied with the performance of using manipulated OFDM waveforms solely, the hybrid waveform concept in which a plurality of currently available waveforms are used within a uniting frame structure to better satisfy various needs simultaneously is introduced. Waveform multiplexing approaches for hybrid waveforms are presented. Emerging solutions regarding determining a number of active numerologies, selection of active numerologies and scheduling of users to and within numerologies as part of the system conditions are discussed.