On the performance of IRS‐assistedOFDMsystem with non‐ideal oscillator and amplifier

Abstract

Intelligent reflective surface (IRS), a software-controlled metasurface, is now a proven and promising candidate technology to achieve superior and reliable data transmission for the next-generation mobile communication systems. This letter investigates the performance of an IRS-assisted orthogonal frequency division multiplexing (OFDM) wireless system in the presence of a non-ideal oscillator and amplifier. The analytical framework comprises of deriving the closed-form expressions for the outage probability, spectral efficiency, energy efficiency, and diversity order. The result shows that the phase noise and distortion significantly limit the performance gain of an IRS-assisted OFDM wireless communication system.

Peak to average power ratio reduction in spectrally efficient FDM using repeated clipping and filtering

“…In our proposed method, the amplitude of the IFFT output stage for the SEFDM modulator is applied to a hard limiter. This limiter will limit the amplitudes within a certain range [19], [20]. The filtering operation after clipping (applying the hard limit) is designed to reduce or cancel OOB distortion [6].…”