Performance Analysis of N-Continuous OFDM Systems with Low-Interference Signal  

作　　者：Peng Wei Yue Xiao Shuxia Yan Wei Xiang 

机构地区：[1]School of Electronics and Information Engineering,Tiangong University,Tianjin 300387,China [2]Tianjin Key Laboratory of Photoelectric Detection Technology and System,Tiangong University,Tianjin 300387,China [3]National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,China [4]School of Engineering and Mathematical Sciences,La Trobe University,Melbourne,VIC 3086,Australia

出　　处：《China Communications》2022年第11期209-230,共22页中国通信（英文版）

基　　金：supported in part by the National Natural Science Foundation of China under Grant 61901298;in part by the Natural Science Foundation of Tianjin under Grant 20JCQNJC00300;in part by the Science&Technology Development Fund of Tianjin Education Commission for Higher Education under Grant 2018KJ211.

摘　　要：N-continuous orthogonal frequency division multiplexing(NC-OFDM)is a promising multicarrier transmission waveform conceived for improving 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 error performance,under the parameters of the highest derivative order(HDO)and the length of the smooth signal,to prove and quantify its advantages over traditional NC-OFDM.In the context of PSD,sidelobe decay is evaluated upon considering two discontinuous 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 studied.

关 键 词：BER low-interference N-continuous OFDM PSD sidelobe suppression 

分 类 号：TN929.5[电子电信—通信与信息系统]