Toward Dual-functional Radar-Communication Systems: Optimal Waveform Design

Abstract

We focus on a dual-functional multi-input-multioutput (MIMO) radar-communication (RadCom) system, where a single transmitter with multiple antennas communicates with downlink cellular users and detects radar targets simultaneously. Several design criteria are considered for minimizing the downlink multiuser interference. First, we consider both omnidirectional and directional beampattern design problems, where the closedform globally optimal solutions are obtained. Based on the derived waveforms, we further consider weighted optimizations targeting a flexible tradeoff between radar and communications performance and introduce low-complexity algorithms. Moreover, to address the more practical constant modulus waveform design problem, we propose a branch-and-bound algorithm that obtains a globally optimal solution, and derive its worst-case complexity as function of the maximum iteration number. Finally, we assess the effectiveness of the proposed waveform design approaches via numerical results.

Enabling Secure Wireless Communications via Intelligent Reflecting Surfaces

“…The BnB algorithm was typically applied for solving NPhard discrete and combinatorial optimization problems, and it has been recently adopted for solving continuous optimization problems [15], [16]. The BnB algorithm is a systematic enumeration of candidate solutions by means of tree traversal.…”

“…For solving P 1 , according to the BnB principles, a lower bound and an upper bound need to be derived for subproblem P 3 . More importantly, the tighter the bounds are, the faster the BnB algorithm converges [16]. Therefore, the main task in this subsection is to find tight bounds for P 3 .…”

A Dual-Function Radar Communication System Using Index Modulation

“…MAJoRCom does not require the DFRC system to have CSI, namely, no a-priori knowledge of the channel to the receiver is required in order to embed the information, as opposed to, e.g., spatial beamforming-based DFRC systems [19], [36]. Such knowledge is only needed at the receiver to facilitate decoding, as discussed in the following section.…”

Enhancing the Physical Layer Security of Dual-Functional Radar Communication Systems

“…While various techniques have been proposed for realizing RCC, one crucial drawback is that most of these approaches require frequent cooperation between radar and communication systems, which might be difficult to be implemented in practice. Therefore, a more promising methodology would be to share both the spectrum and the hardware platform between these two functionalities, which requires no additional coordinations, and has motivated the study of the dual-functional radar-communication (DFRC) system [4]. In [5], the authors proposed to embed communication symbols into the sidelobes of the radar transmit beampattern, with the mainlobe being employed for target detection, which allows information delivery to single or multiple communication directions outside the mainlobe of the radar.…”