A low-interference time-domain N-continuous OFDM scheme

N-continuous orthogonal frequency division multiplexing (NC-OFDM) is an outstanding method to suppress sidelobe for baseband OFDM signals in future 5G wireless communications. However, the precoder of NC-OFDM usually causes severe interference and high complexity. To alleviate these problems, this paper proposes an improved time-domain N-continuous OFDM (TD-NC-OFDM) by optimizing the smooth signal, which is the linear combination of rectangularly pulsed OFDM basis signals truncated by a smooth window. Furthermore, we show that the proposed scheme is with lower transceiver complexity and notable performance gain in signal-to-interference-plus-noise ratio (SINR). Lastly, simulation results show that the proposed low-interference TD-NC-OFDM can achieve similar sidelobe suppression performance, with negligible bit-error rate (BER) degradation, compared to conventional NC-OFDM.