A Novel Transmitter Architecture for Spectrally-Precoded OFDM

Frequency nulling spectral precoding is an approach that suppresses the out-of-band emission in OFDM systems. In this paper, we discuss the transmitter architecture of the spectrally precoded OFDM systems. We design a novel precoder that matches the practical implementation of the OFDM modulator. We show that spectral precoding can relax the analog low pass filtering requirements of the OFDM system transmitter. We examine the effect of spectral precoding on the PAPR as well as the effect of the PA on the spectral precoding suppression performance. We also study the compliance of the spectrally precoded OFDM transmitter with the 3GPP standardization measures and analyze its computation complexity. At the receiver side, we analyze the in-band interference and BER performance of the suggested precoding approach.