Abstract
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.
Highlights
Wireless spectrum sharing has attracted significant attention from researchers due to the ever-increasing demand for spectral resources for existing and emerging applications [1,2,3,4,5,6]
We show that the optimization strategy for power allocation is a convex optimization problem, whereas the optimization for the subcarrier distribution for multiple communication users is a mixed-integer linear programming (MILP) problem; In order to reduce the computational complexity of the optimization problems, we introduce chunk power allocation and subcarrier assignment techniques
We presented a novel Joint Radar-communication (JRC) system that exploits orthogonal frequency-division multiplexing (OFDM) waveforms to perform both radar and communication operations simultaneously
Summary
Wireless spectrum sharing has attracted significant attention from researchers due to the ever-increasing demand for spectral resources for existing and emerging applications [1,2,3,4,5,6]. Modern wireless communication systems require extensive expansion in allocated spectral resources in order to enhance data rates and quality of service. Emerging technical fields, such as the Internet of Things, call for new dedicated spectral allocations to bring new products onto the market. The first type consists of co-existing radar and communication systems in the same spectrum bands where the mutual interference is mitigated via exploiting extensive cooperation and/or information sharing between the two systems. The second strategy enables Joint Radar-communication (JRC) by utilizing dual-purpose waveforms that serve the objective of both subsystems
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