Minimum-EVM N-continuous OFDM

The N-continuous precoder for the suppression of OOB emission in OFDM systems that minimizes the EVM is introduced. We show that the minimum in-band interference due to the introduced precoding approach is 3 dB less than the inband interference of existing N-continuous precoders. Moreover, we introduce a novel practical block precoder that approaches the performance of the suggested optimal precoder. We analyze the spectrum of the OFDM signal after block precoding, the inband interference due to block precoding and the effect of block precoding on the BER. The price to pay for block precoding is the computational complexity that grows linearly with the block size.