N-continuous Aided GFDM Signaling
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An N-continuous-based generalized frequency division multiplexing (GFDM) transceiver architecture is investigated, which operates with the aid of time-domain N-continuous orthogonal frequency devision multiplexing (TD-NC-OFDM), hence called time-domain N-continuous GFDM (TD-NC-GFDM). More specifically, the basis signals conceived allow us to attain compact spectrum as an explicit benefit of sidelobe suppression, which constitute the smooth signal capable of eliminating the discontinuities imposed by the cyclic shift GFDM filters and their high-order derivatives. The proposed N-continuous GFDM signaling has relatively low interference through evaluating the signal-to-interference ratio (SIR) that significantly decreases upon increasing the number of GFDM subsymbols. Furthermore, a signal recovery algorithm for reception is adopted by constructing a decoding matrix for eliminating the interference caused by the smooth signal, which exhibits an explicit error performance improvement compared to TD-NC-OFDM. It is demonstrated that N-continuous GFDM outperforms TD-NC-OFDM in terms of sidelobe suppression, while achieving small BER performance degradation with a small roll-off filter compared to original OFDM.
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