论文标题
下一代无线通信的仿射频施工多路复用
Affine Frequency Division Multiplexing for Next Generation Wireless Communications
论文作者
论文摘要
此处介绍了Affine频率分层多路复用（AFDM），这是一种用于高移动性通信的新型基于CHIRP的多载波波形。 AFDM基于离散的仿射傅立叶变换（DAFT），这是离散傅立叶变换的概括，其特征是两个参数，可以改编以更好地应对双色散通道。首先，我们在DAFT域中得出明确的输入输出关系，以显示AFDM参数在输入输出关系中的影响。其次，我们展示了如何设置AFDM基础的DAFT参数，以使所得的DAFT域脉冲响应传达通道的完整延迟多普勒表示。然后，我们通过分析表明，AFDM可以在双色散通道中实现完全多样性，其中完全多样性是指在延迟或多普勒域中可分离的多径成分的数量，这是由于其完整的延迟多普勒表示。此外，我们提出了一种利用零盖的优势检测方法低的复杂性检测方法。我们还提出了AFDM的嵌入式试验通道估计方案，其中通道估计和数据检测均在同一AFDM框架内执行。最后，模拟证实了我们的分析结果的有效性，并显示了高移动性场景中AFDM比最先进的多载波方案的显着性能提高。
Affine Frequency Division Multiplexing (AFDM), a new chirp-based multicarrier waveform for high mobility communications, is introduced here. AFDM is based on discrete affine Fourier transform (DAFT), a generalization of discrete Fourier transform, which is characterized by two parameters that can be adapted to better cope with doubly dispersive channels. First, we derive the explicit input-output relation in the DAFT domain showing the effect of AFDM parameters in the input-output relation. Second, we show how the DAFT parameters underlying AFDM have to be set so that the resulting DAFT domain impulse response conveys a full delay-Doppler representation of the channel. Then, we show analytically that AFDM can achieve full diversity in doubly dispersive channels, where full diversity refers to the number of multipath components separable in either the delay or the Doppler domain, due to its full delay-Doppler representation. Furthermore, we present a low complexity detection method taking advantage of zero-padding. We also propose an embedded pilot-aided channel estimation scheme for AFDM, in which both channel estimation and data detection are performed within the same AFDM frame. Finally, simulations corroborate the validity of our analytical results and show the significant performance gains of AFDM over state-of-the-art multicarrier schemes in high mobility scenarios.
