dle of the channel. The waveform defined by 100 MHz channel bandwidth, 120 kHz SCS, DFT-S-OFDM QPSK, and 20RB23 allocation occupies the center third of the channel, and thus its third order inter-modulation regrowth range is contained within the channel, and the associ- ated 4% power equivalent to the 17 dBc ACLR linearity level being within the channel, the 99% OBW criterion is met. For this reason, this particular waveform is defined as the 0 dB MPR reference waveform. Given this reference, the power class 3 MPR table below could be defined. For higher order modulations than QPSK, the EVM require- ment dominates, and the MPR level is similar for inner and outer allocations. As for FR1, CP-OFDM has a higher MPR due to its higher PAPR. In Table 12.8, inner allocations are within the center third of the channel, or RBstart Ceil(1/3 NRB) AND RB end Ceil(2/3 N); and outer allocations are located in the two other thirds at the edges of the channel, or start < OR RBend > Ceil(2/3 Ngg). 12.4.4.4 Impact on FR2 Relaxed ACLR Requirements on MPR Gating Factor The impact of ACLR relaxation for low order modulation schemes is illustrated in Figure 12.15, where the OBW and ACLR are evaluated versus the PA transmit power at 24 GHz using a fully allocated DFT-S-OFDM QPSK waveform in 100 MHz CBW 12 5G RF Design Challenges Table 12.8 MPR table for PC3 channels <200 MHz. Modulation Inner Outer Waveform type order allocations allocations Pi/2 BPSK DFT-s-OFDM 16-QAM 64-QAM CP-OFDM 16-QAM 64-QAM [12]. Figure 12.15b shows that at 0.7 dB back-off from the 0 dB MPR reference level, the OBW is just met but the ACLR is far from reaching the minimum requirements of 17 dBc. In Figure 12.15c, 99% of the total power is no longer constrained within the channel bandwidth and starts "splashing" into the adjacent channels. Yet the ACLR requirements are still met. The exhaustive simulations in [13] lead to the same conclusions. 12.4.5 Multi-Band Support and Carrier Aggregation The beamforming operation in FR2 essentially depends on the antenna arr