In the past few years, some alternatives to the Orthogonal Frequency Division Multiplexing (OFDM) modulation have been considered to improve its spectral containment and its performance level in the presence of heavy Doppler shifts. This paper examines a novel modulation, named Doppler-Resilient Universal Filtered MultiCarrier (DR-UFMC), which has the objective of combining the advantages provided by the Universal Filtered MultiCarrier (UFMC) modulation (i.e., better spectral containment), with those of the Orthogonal Time Frequency Space (OTFS) modulation (i.e., better performance in time-varying environments). The paper contains the mathematical model and detailed transceiver block scheme of the newly described modulation, along with a numerical analysis contrasting DR-UFMC against OTFS, OFDM with one-tap frequency domain equalization (FDE), and OFDM with multicarrier multisymbol linear MMSE processing. Results clearly show the superiority, with respect to the cited benchmarks, of the newly proposed modulation in terms of achievable spectral efficiency. Interestingly, it is also seen that OFDM, when considered in conjunction with multicarrier multisymbol linear minimum mean squares error (MMSE) processing, performs slightly better than OTFS in terms of achievable spectral efficiency.

翻译：近年来，为改善正交频分复用（OFDM）调制的频谱包络性能及其在强多普勒频移条件下的性能水平，业界提出了一些替代方案。本文研究了一种名为“多普勒鲁棒通用滤波多载波（DR-UFMC）”的新型调制技术，旨在融合通用滤波多载波（UFMC）调制的优势（即更优的频谱包络性能）与正交时频空（OTFS）调制的优势（即在时变环境中的更优性能）。文中给出了新调制的数学模型与详细的收发机框图，并进行了数值分析，将DR-UFMC与OTFS、采用单抽头频域均衡（FDE）的OFDM、以及采用多载波多符号线性最小均方误差（MMSE）处理的OFDM进行对比。结果明确显示，相较于上述基准方案，新提出的调制在可达频谱效率方面具有优越性。有趣的是，研究还发现，当OFDM与多载波多符号线性最小均方误差（MMSE）处理相结合时，其可达频谱效率略优于OTFS。