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Power Amplifier for OFDM system.

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Knowing that one of the constraints for OFDM system is the high Peak-to-average power ratio (PAPR), which is a drawback when come to the power amplifier in RF. Is there anyone know, what is the maximum PAPR we can go for before sature in non-linear region in power amplifier?Any information about this, I mean website or paper? Thanks.
 

In OFDM even if this type of modulation has high PAR and fast-varying amplitudes, to minimize power consumption and yield the highest efficiency, the PA must be operated with some degree of compression. Finding the optimum operating point is complicated because most power sensors used in typical power meters are not fast enough to track the quickly varying OFDM signals. Moreover, the power meter reading must be gated in order to avoid averaging the gaps between packets.
Two key measurements shall be made during the tuning of the operating point: EVM and CCDF. And of course meeting all the other parameters: Pout, Efficiency, ACPR or Power Mask, Noise, Harmonics, etc.
 

Here is one attached

Effect of Power Amplifier Impairments in Designing OFDM Based
Wireless Communication Systems
 

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