We consider the problem of time-frequency waveform design for an OFDM dual-functional radar-communications (DFRC) system that communicates with receiver while simultaneously estimating target parameters using backscattered signals. In particular, goal is to achieve a favorable performance trade-off between radar and communications by optimizing subcarrier powers in region interest. First, we fo...

The demand for efficient utilization of biomass induces a detailed analysis of the fundamental chemical structures of biomass, especially the complex structures of lignin polymers, which have long been recognized for their negative impact on biorefinery. Traditionally, it has been attempted to reveal the complicated and heterogeneous structure of lignin by a series of chemical analyses, such as...

The structure of the lignin in the cortex and pith of elephant grass (Pennisetum purpureum) stems was studied both in situ and in isolated milled "wood" lignins by several analytical methods. The presence of p-coumarate and ferulate in the cortex and pith, as well as in their isolated lignins, was revealed by pyrolysis in the presence of tetramethylammonium hydroxide, and by 2D NMR, and indicat...

This paper presents the micromechanical modeling of fiber bridging constitutive law of a discontinuous fiber reinforced composite (DFRC) under cyclic loading. Fiist, the derivation of fiber bridging constitutive law under monotonic loading is briefly reviewed to highlight he approach to obtain the bridging stress carried by randomly distributed discontinuous fibers. Second, the relation between...

The accepted derivation of lignins from non(enzymatically)-controlled radical coupling reactions has been recently challenged, and it is relevant to ascertain unequivocally whether lignins are or are not (as normally assumed) optically active. Two approaches were used. First, DFRC (derivatization followed by reductive cleavage) dimers derived from beta-5- and beta-beta-units in pine lignins, wh...

Dual-functional radar-communication (DFRC) systems can simultaneously perform both radar and communication functionalities using the same hardware platform spectrum resource. In this paper, we consider multi-input multi-output (MIMO) DFRC focus on transmit beamforming designs to provide sensing multi-user communications. Unlike conventional block-level precoding techniques, propose use recently...

In this paper, we design constant modulus waveforms for dual-function radar-communication (DFRC) systems based on a multi-input multi-output (MIMO) configuration of sensors far-field scenario. At first, formulate non-convex optimization problem subject to waveform synthesis minimizing the interference power while maintaining constraint. Next, solve problem, iteratively, using alternating direct...

In this paper, we investigate the robust resource allocation design for secure communication in an integrated sensing and (ISAC) system. A multi-antenna dual-functional radar-communication (DFRC) base station (BS) serves multiple single-antenna legitimate users senses targets simultaneously, where already identified are treated as potential eavesdroppers. The DFRC BS scans a sector with sequenc...

In this study, we propose a framework for chirp-based communications by exploiting discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM). We show that well-designed frequency-domain spectral shaping (FDSS) filter DFT-s-OFDM can convert its single-carrier nature to linear combination of chirps circularly translated in the time domain. Also, properties series a...