Outer Bounds for a Joint Communicating Radar (Comm-Radar): The Uplink Case

Limited access to available spectrum motivates new age radio frequency (RF) systems to co-exist and cooperate. In this paper, we consider a joint communication and radar system (labeled Comm-Radar), that is capable of receiving and decoding communication signals while simultaneously enabling radar f...

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Bibliographic Details
Published in:IEEE transactions on communications 2022-02, Vol.70 (2), p.1197-1213
Main Authors: Li, Cheng, Raymondi, Nathaniel, Xia, Bin, Sabharwal, Ashutosh
Format: Article
Language:English
Subjects:
Communication
communication rate
Communications systems
Cramér-rao bound
Estimation
estimation rate
Interference
joint communication-radar system
Mathematical analysis
Radar
Radar antennas
Radar equipment
Radar scattering
Radar signal processing
Radar targets
Radio frequency
rate regions
Uplink
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Summary:Limited access to available spectrum motivates new age radio frequency (RF) systems to co-exist and cooperate. In this paper, we consider a joint communication and radar system (labeled Comm-Radar), that is capable of receiving and decoding communication signals while simultaneously enabling radar functionalities. Traditionally, systems that leverage principles of spectrum convergence, deemed each functions to be detrimental to the others. This has led to successive interference cancellations strategies that effectively isolate each of the functionalities. Here, in the context of Comm-Radar processing structure, we show that ambient communication transmissions actually assist in radar estimation. The insight is that communications multipath reflects off radar targets (we denote these comm-target paths) in the environment, and can be processed at the receiver to extract extra information. In this work we characterize the fundamental performance limits of such a joint system.To demonstrate the radar performance gain achievable via the processing of extra comm-target paths, the closed-form Cramér-Rao Bound (CRB) for the estimation of direction, range and velocity of a target is derived, for both the general case, and practical radar and communication signalling schemes. Based on the CRB, joint outer bounds are obtained to characterize the trade off between estimation performance and communication rate. Finally, numerical results verify the advantages of utilizing the target reflections from the communication signal to bolster radar performance.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2021.3126741