Waveform Design Considerations for 5G Wireless Networks (2 PDH)
This article presents the requirements of 5G communication systems and the fundamentals of waveform design to cover them for 5G wireless communication networks. According to a report from 5G PPP Architecture Working Group, the 5G network will operate in a wide spectrum range with a diverse array of characteristics. Accordingly, the 5G communication channel will be heterogeneous and provide for users with different demands. The waveform design of the physical layer is critical to meet new demands and requirements, such as low latency, low power consumption, high data rates, and spectrum efficiency. TF lattice structures and pulse shaping must be determined. The design criteria of time-frequency lattice structures include transmission scheme, time and frequency allocation of symbols, resolution in time and frequency, and time-bandwidth product. Pulse shaping, on the other hand, is the filtering process that maps the modulated signals to the time-frequency lattice to control the interferences. This article also includes a transceiver scheme of some candidate waveforms and performance evaluations. Accordingly, orthogonal frequency division multiplexing (OFDM) has an easy implementation, but the high level of out-of-band (OOB) emission and peak-to-average power value. The waveforms that include filtering have lower OOB emission but high complexity.