N-continuous orthogonal frequency divi-sion multiplexing(NC-OFDM)is a promising multi-carrier transmission waveform conceived for improv-ing sidelobe suppression performance.To reduce the severe inband interference in traditional NC-OFDM,we have proposed low-interference signal modeling for NC-OFDM.However,spectral leakage and error may be undesirably increased owing to the limited continuous differentiability of the smooth signal.In this paper,the low-interference scheme is investigated in terms of power spectrum density(PSD)and er-ror performance,under the parameters of the highest derivative order(HDO)and the length of the smooth signal,to prove and quantify its advantages over tra-ditional NC-OFDM.In the context of PSD,sidelobe decay is evaluated upon considering two discontinu-ous points due to the finite continuity of the smooth signal and its higher-order derivatives.Furthermore,it was shown that the low-interference scheme incurs small signal-to-noise ratio(SNR)loss and bit error rate(BER)for a short length of the smooth signal or a small HDO compared to traditional NC-OFDM.Meanwhile,due to the cyclostationarity loss imposed by the smooth signal,an effective solution is suggested for the time synchronization in a practical system.Based on analyses and simulation results,the trade-offs between sidelobe suppression and BER are stud-ied.

Peng Wei;Yue Xiao;Shuxia Yan;Wei Xiang

School of Electronics and Information Engineering,Tiangong University,Tianjin 300387,China;Tianjin Key Laboratory of Photoelectric Detection Technology and System,Tiangong University,Tianjin 300387,China;National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,China;School of Engineering and Mathematical Sciences,La Trobe University,Melbourne,VIC 3086,Australia

中国通信（英文版）

[1]Peng Wei;Yue Xiao;Shuxia Yan;Wei Xiang-.Performance Analysis of N-Continuous OFDM Systems with Low-Interference Signal)[J].中国通信（英文版）,2022(11):209-230

inband,undesirably,differentiability,cyclostationarity

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