A Novel One-tap Equalizer for Zero-Padded AFDM System over Doubly Selective Channels
Chenyang Zhang, Akram Shafie, Cheng Shen, Deepak Mishra, and Jinhong Yuan

TL;DR
This paper introduces a low-complexity one-tap equalizer for zero-padded AFDM systems over doubly selective channels, utilizing parameter selection, zero padding, and a new domain transformation to enhance efficiency and robustness.
Contribution
It proposes a novel one-tap equalizer for ZP-AFDM systems that simplifies affine domain IOR and improves performance over doubly selective channels.
Findings
Effective equalization with high $c_1$ values
Simplified affine domain IOR via zero padding
Robust performance demonstrated numerically
Abstract
Recently, affine frequency division multiplexing (AFDM) has gained traction as a robust solution for doubly selective channels. In this paper, we present a novel low-complexity one-tap equalizer for zero-padded AFDM (ZP-AFDM) systems. We first select the AFDM parameters, and , such that has a relatively high value, and depends on , which simplifies the affine domain input-output relation (IOR). This selection also demonstrates that a phase term that varies slowly along the affine domain is experienced by all affine domain symbols and this variation is significantly slower compared to that experienced by the time domain symbols over doubly selective channels. To simplify the equalization, we then introduce zero padding to the transmitted affine domain symbols and reconstruction operation on the received affine domain symbols. By doing so, we convert the…
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Taxonomy
TopicsPAPR reduction in OFDM · Advanced Wireless Communication Techniques · Digital Filter Design and Implementation
