Work

Channel Estimation for AFDM With Superimposed Pilots

Year: 2024

Type: article

Abstract: The recent proposed affine frequency division multiplexing (AFDM) employing a multi-chirp waveform has shown its reliability and robustness in doubly selective fading channels. In the existing embedded pilot-aided channel estimation methods, the presence of guard symbols in the discrete affine Fourier transform (DAFT) domain causes inevitable degradation of the spectral efficiency (SE). To improve the SE, we propose a novel AFDM channel estimation scheme by introducing the superimposed pilots in the DAFT domain. An effective pilot placement method that minimizes the channel estimation error is also developed with a rigorous proof. To mitigate the pilot-data interference, we further propose an iterative channel estimator and signal detector. Simulation results demonstrate that both channel estimation and data detection performances can be improved by the proposed scheme as the number of superimposed pilots increases.

Source: IEEE Transactions on Vehicular Technology

DOI: 10.1109/tvt.2024.3469380

Authors: Kai Zheng, Miaowen Wen, Tianqi Mao, Lixia Xiao, Zhaocheng Wang

Institutions: South China University of Technology, Beijing Institute of Technology, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Tsinghua University

Language: English

Topic: Advanced Wireless Communication Techniques

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Fundamental Research Funds for the Central Universities, Basic and Applied Basic Research Foundation of Guangdong Province

Awards: G2575069074, G7264393904, G8568905075