Waveform Design for OFDM-based ISAC Systems Under Resource Occupancy Constraint
arxiv(2023)
摘要
Integrated Sensing and Communication (ISAC) is one of the key pillars
envisioned for 6G wireless systems. ISAC systems combine communication and
sensing functionalities over a single waveform, with full resource sharing. In
particular, waveform design for legacy Orthogonal Frequency Division
Multiplexing (OFDM) systems consists of a suitable time-frequency resource
allocation policy balancing between communication and sensing performance. Over
time and/or frequency, having unused resources leads to an ambiguity function
with high sidelobes that significantly affect the performance of ISAC for OFDM
waveforms. This paper proposes an OFDM-based ISAC waveform design that takes
into account communication and resource occupancy constraints. The proposed
method minimizes the Cram\'er-Rao Bound (CRB) on delay and Doppler estimation
for two closely spaced targets. Moreover, the paper addresses the
under-sampling issue by interpolating the estimated sensing channel based on
matrix completion via Schatten $p$-norm approximation. Numerical results show
that the proposed waveform outperforms the state-of-the-art methods.
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