Channel Estimation for AFDM With Superimposed Pilots
arxiv(2024)
摘要
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.
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