Performance Evaluation of a Full-Duplex UWA System in Lake Experiments
arxiv(2024)
Abstract
In this work we present a full-duplex (FD) underwater acoustic (UWA)
communication system simultaneously transmitting and receiving acoustic signals
in the same frequency bandwidth. To simplify the FD hardware, the system
exploits a recently designed transducer capable of simultaneously transmitting
and receiving signals. The key challenge of implementing an FD system is to
cancel at the near-end receiver the strong self-interference (SI) from the
near-end transmitter. By using advanced adaptive filtering algorithms providing
high accuracy channel estimates, a high level of SI cancellation can be
achieved when the far-end signal is absent. However, the SI channel estimation
performance is limited in FD scenarios since the far-end signal acts as an
interference when estimating the near-end SI channel. In this paper, we propose
an FD UWA communication system which alternates between the SI cancellation and
far-end data demodulation. An adaptive Rake combiner with multipath
interference cancellation is implemented to improve the demodulation
performance in time-varying multipath channels. The performance of the FD UWA
system is evaluated in lake experiments. It is shown that the proposed adaptive
Rake combiner with multipath interference cancellation significantly
outperforms the conventional Rake combiner in all the experiments. The
experimental results demonstrate that, with the new Rake combiner, the
detection performance of the proposed FD UWA system is comparable with that of
the half-duplex system.
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