Integrated Sensing and Communications with Affine Frequency Division Multiplexing
IEEE Wireless Communications Letters(2024)
摘要
Integrated sensing and communications (ISAC) is regarded as a key technology
in next-generation (6G) mobile communication systems. Affine frequency division
multiplexing (AFDM) is a recently proposed waveform that achieves optimal
diversity gain in high mobility scenarios and has appealing properties in
high-frequency communication. In this letter, we present an AFDM-based ISAC
system. We first show that in order to identify all delay and Doppler
components associated with the propagation medium, either the full AFDM signal
or only its pilot part consisting of one discrete affine Fourier transform
(DAFT) domain symbol and its guard interval can be used. Our results show that
using one pilot symbol achieves almost the same sensing performance as using
the entire AFDM frame. Furthermore, due to the chirp nature of AFDM, sensing
with one pilot provides a unique feature allowing for simple self-interference
cancellation, thus avoiding the need for expensive full duplex methods.
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关键词
AFDM,ISAC,affine Fourier transform,chirps,doubly dispersive channels
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