A Bandwidth Efficient Dual-Function Radar Communication System Based on a MIMO Radar Using OFDM Waveforms

Abstract

A novel dual-function radar communication (DFRC) system is proposed, that achieves high communication rate, and can flexibly trade-off rate for improved sensing performance. The proposed system is a monostatic multiple-input multiple-output (MIMO) radar and transmits wideband, precoded, orthogonal frequency division multiplexing (OFDM) waveforms from its antennas. The system subcarriers are divided into two groups, i.e., shared and private. On a shared subcarrier, all antennas can transmit simultaneously, while on a private one only one antenna can transmit at a time. A novel target estimation approach with low complexity is proposed to overcome the coupling of transmitted symbols and radar target parameters in the target echoes, which arises due to the shared use of subcarriers by the transmit antennas. The proposed method first operates on all (shared and private) subcarriers to obtain coarse angle estimates, and then fine-tunes those estimates based on the signal received on the private subcarriers. The resolution of the coarse angle estimates is limited by the physical receive array, while the finetuning is enabled by effectively constructing a virtual array that has larger aperture than the receive array. The precoding matrix is optimally designed to optimize a weighted combination of the beampattern error with respect to a desirable beampattern, and the signal-to-noise ratio at the communication receiver.

RIS-Assisted MIMO OFDM Dual-Function Radar-Communication Based on Mutual Information Optimization

“…The Genetic Algorithm (GA) is a potent evolutionary algorithm variant that can tackle non-convex optimization problems [34]. This study uses the GA to determine the subcoding vectors to solve the multi-objective problem defined in (23).…”

“…Numerous studies have probed into the integration of radar and communication systems, outlining different approaches to amplify system performance, including joint resource management [6,[20][21][22][23].…”

Inner-Frame Time Division Multiplexing Waveform Design of Integrated Sensing and Communication in 5G NR System

“…OFDM waveforms provide high communication data rates and the ability to efficiently deal with frequency selective fading. Hence, many researchers have investigated the OFDM-integrated radar and communications waveform [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. In [ 18 , 19 ], the authors proposed a waveform design method that maximizes the weighted sum of the communications data information rate (DIR) and the conditional mutual information (MI) between the observed signal and the random target impulse response over the entire uncertainty class.…”

“…However, radar and communications require the use of different transceiver antennas. In [ 25 ], the concept of shared and private subcarriers is proposed, where shared subcarriers are used to realize the communication function, and private subcarriers are used to assist sensing. When the number of private subcarriers is increased, the sensing performance improves, but the communication rate decreases.…”

Distributed Sensing and Centric Computing via FMCW Waveform in Wireless Sensor Network

“…In [4], to achieve a favorable performance trade-off between radar and communications, the powers of OFDM subcarriers are optimized in a timefrequency region of interest. The recent work [5] proposes a method, by dividing the OFDM subcarriers into shared and private ones, to obtain coarse angle estimates first and then fine-tunes the estimates on the private subcarriers. It is worth mentioning that the OFDM signals has been applied in WSNs [6]- [8] which primarily focused on data transmission and estimation.…”