论文标题
OTF：与块CP交织在一起
OTFS: Interleaved OFDM with Block CP
论文作者
论文摘要
正交时间频率空间（OTFS）调制是最近提出的用于高速车辆通信方案中可靠通信的波形。与正交频分多路复用（OFDM）相比，它对载体间干扰（ICI）具有更好的弹性。在这项工作中，我们将OTF描述为具有环状前缀和时间交织的OTF。这种解释有助于根据OFDM可视化OTF，并且还有助于分析OTF对OFDM获得的增益。此外，我们将OTF的性能与其竞争者5G新无线电（NR）的ofdm配置进行了可变子载波带宽（VSB-OFDM）的配置，同时考虑实用的前向误差校正代码和3GPP高速通道模型。这提供了现实的性能比较，这是技术实现的高度期望。考虑到实用的通道估计，我们发现OTF的表现优于5G NR参数的VSB-OFDM约为5DB。由于OTF中使用的特定试验结构用于通道估计，我们还提出了峰值与平均功率比（PAPR）的结果。
Orthogonal time frequency space (OTFS) modulation is a recently proposed waveform for reliable communication in high-speed vehicular communication scenarios. It has better resilience to inter-carrier interference (ICI) than orthogonal frequency division multiplexing (OFDM). In this work, we describe OTFS as block-OFDM with a cyclic prefix and time interleaving. This interpretation helps one visualize OTFS in the light of OFDM as well as it also helps in analyzing the gain obtained by OTFS over OFDM. Further, we compare the performance of OTFS with its contender 5G new radio (NR)'s OFDM configuration of variable subcarrier bandwidth (VSB-OFDM) while considering practical forward error correction codes and 3GPP high-speed channel model. This provides realistic performance comparison, which is highly desired for technology realization. Considering practical channel estimation, we find that OTFS outperforms VSB-OFDM with 5G NR parameter by about 5dB. We also present results on peak to average power ratio (PAPR) due to specific pilot structure used in OTFS for channel estimation.
