Bistatic OFDM-based ISAC with Over-the-Air Synchronization: System Concept and Performance Analysis
arxiv(2024)
摘要
Integrated sensing and communication (ISAC) has been defined as one goal for
6G mobile communication systems. In this context, this article introduces a
bistatic ISAC system based on orthogonal frequency-division multiplexing
(OFDM). While the bistatic architecture brings advantages such as not demanding
full duplex operation with respect to the monostatic one, the need for
synchronizing transmitter and receiver is imposed. In this context, this
article introuces a bistatic ISAC signal processing framework where an incoming
OFDM-based ISAC signal undergoes over-the-air synchronization based on preamble
symbols and pilots. Afterwards, bistatic radar processing is performed using
either only pilot subcarriers or the full OFDM frame. The latter approach
requires estimation of the originally transmitted frame based on communication
processing and therefore error-free communication, which can be achieved via
appropriate channel coding. The performance and limitations of the introduced
system based on both aforementioned approaches are assessed via an analysis of
the impact of residual synchronization mismatches and data decoding failures on
both communication and radar performances. Finally, the performed analyses are
validated by proof-of-concept measurement results.
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