Joint Radar-Communications Exploiting Optimized OFDM Waveforms

We propose novel Joint Radar-communication spectrum sharing strategies exploiting orthogonal frequency-division multiplexing (OFDM) waveforms that concurrently achieve the objectives of both radar and communication systems. An OFDM transmitter is considered that transmits dual-purpose OFDM subcarrie...

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Veröffentlicht in:Remote sensing (Basel, Switzerland) Jg. 13; H. 21; S. 4376
Hauptverfasser: Ahmed, Ammar, Zhang, Yimin D., Hassanien, Aboulnasr
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Basel MDPI AG 01.11.2021
Schlagworte:
Communication channels
Communications systems
communications technology
Computer applications
Design
Electric power distribution
Frequency dependence
Integer programming
Joint Radar-communications
Linear programming
Mixed integer
mixed-integer linear programming
mutual information
Noise
Optimization
Orthogonal Frequency Division Multiplexing
orthogonal frequency-division multiplexing (OFDM)
Performance evaluation
Radar
Receivers & amplifiers
Remote sensing
Resource allocation
spectrum sharing
Subcarriers
Transmitters
Waveforms
ISSN:2072-4292, 2072-4292
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Zusammenfassung:We propose novel Joint Radar-communication spectrum sharing strategies exploiting orthogonal frequency-division multiplexing (OFDM) waveforms that concurrently achieve the objectives of both radar and communication systems. An OFDM transmitter is considered that transmits dual-purpose OFDM subcarriers such that all the subcarriers are exploited for the primary radar function and further exclusively allocated to the secondary communication function serving multiple users. The waveform optimization is performed by employing mutual information (MI) as the optimization criterion for both radar and communication operations. For the purpose of radar performance optimization, we consider the MI between the frequency-dependent target response and the transmit OFDM waveforms. On the other hand, communication system performance is evaluated in terms of the MI between the frequency-dependent communication channels of communication users with the transmit OFDM subcarriers. These optimization objectives not only enable the transmit power allocation of the OFDM subcarriers, but also govern the subcarrier distribution among the communication users. Two resource optimization scenarios are considered, resulting in radar-centric and cooperative resource allocation strategies that exploit convex and mixed-integer linear programming optimization problems for power allocation and subcarrier distribution, respectively. We further present a chunk subcarrier allocation approach that applies to both optimization strategies to reduce the computational complexity with a trivial performance loss. Simulation results are presented to illustrate the effectiveness of the proposed strategies.
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs13214376