In this brief, a new noncoherent chaos-based communication scheme, named high-efficiency differential chaos shift keying (DCSK) (HE-DCSK), is proposed. By recycling each reference sample in DCSK, 2 bits of data can be carried one data-modulated sequence, which offers our scheme double bandwidth efficiency and nonrepeated transmitted signal less prone to interception comparison DCSK. The bit-error performance the proposed studied analytically based on Gaussian approximation for discrete-time...

In this brief, a reference-modulated differential chaos shift keying (DCSK) (RM-DCSK) is proposed for reliable and high-data-rate chaotic communication with low cost. scheme, the wavelet sent in either first or second slot of each frame not only carries one bit data but also serves as message bearer transmitted its following time slot. Without any extra cost decoding complexity, RM-DCSK can achieve doubled attainable rate improved security comparison to DCSK. The error (BER) performance new...

A novel non-coherent multi-level differential chaos shift keying (DCSK) modulation scheme is proposed in this paper. This new based on both the transmitted-reference technique and M-ary orthogonal modulation, where each data-bearing signal chosen from a set of chaotic wavelets constructed by reference signal. Thanks to signaling design, can achieve higher attainable data rate, lower energy loss transmission, increased bandwidth efficiency, better security bit error rate (BER) performance as...

Based on multi-carrier transmission and multi-level chaos shift keying modulation, a novel (MC-CSK) modulation system is proposed designed in this paper. The new adopts multiple subcarriers, which all chaotic basis signals along with data-bearing are transmitted simultaneously. their references, though sharing the same separated by I/Q channels. As consequence, MC-CSK can achieve higher bit rate better spectral efficiency compared MC-DCSK system. It also dispense synchronization threshold...

In this brief, a phase-separated differential chaos shift keying (PS-DCSK) modulation scheme is proposed as simple delay-component-free version of DCSK modulation. Separated by orthogonal sinusoidal carriers rather than time delay, the reference and information-bearing signals in are transmitted simultaneously parallel system. As result, PS-DCSK not only can avoid difficult-to-implement radio-frequency delay line problem but also achieve doubled attainable data rate, enhanced communication...

A Gaussian process regression (GPR) model based on an improved automatic kernel construction (AKC) algorithm using beam search is proposed to establish a surrogate between lift body shape parameters and aerodynamic coefficients with various training sets sizes. The precision of our assessed through tenfold cross-validation. AKC-GPR algorithm, polynomial regression, support vector (SVR) are employed construct the model. interpolation extrapolation capabilities model, as generated by examined...

A high data rate multi-carrier differential chaos shift keying system with hybrid index modulation, referred to as HDR-HIM-MC-DCSK, is proposed in this paper. In the system, multiple data-bearing wavelets are parallelly transmitted one reference signal. Different Walsh codes utilized for separating these wavelets. Some subcarriers used which chaotic signal and its Hilbert transform generated representing active inactive subcarriers. addition, analytical Bit-Error-Rate (BER) expressions of...

In this paper, a modified code index modulation scheme based on the multi-carrier M-ary DCSK system, referred to as MC-MCIM-MDCSK is proposed. proposed carried out, which selects two orthogonal Walsh codes for realizing encoder. The theoretical BER expression of system obtained over additive white Gaussian noise (AWGN) and multipath Rayleigh fading channels. Abundant simulation results showed that matched results. energy efficiency (EE), spectrum (SE), data rate, complexity were carefully...

With the emergence of data center network and global information network, demand for ultra-wide broadband is increasing. As a platform connecting to it necessary study its low power consumption in submarine optical network. Firstly, background requirements networks are analyzed studied this paper. Secondly, key technologies sorted out summarized from aspects adaptive link rate, filterless non-relay transmission, sleep important function modules terminal.

The influence of dihedral layout on lateral–directional dynamic stability the tailless flying wing aircraft is discussed in this paper. A with a large aspect ratio selected as object study, and angle along spanwise sections divided into three segments. layouts studied. Based derivatives calculated by vortex lattice method code, linearized small-disturbance equations lateral modes are used to determine mode characteristics. By comparing 7056 configurations different layouts, two groups...

This study investigates an instability that was observed during high-speed taxi tests of experimental flying-wing aircraft. In order to resolve the reason and probable solution it, reproduced in simulations. An analysis revealed unique stability characteristics this aircraft has a rigid connection between nose wheel steering mechanism electric servo, which is different from with conventional tricycle landing gear system. The based on simulation results suggests there are two reasons for...

The carrier index differential chaos shift keying (CI-DCSK) modulation scheme transmits one reference and a single data-bearing wavelet over different subcarriers within symbol duration, resulting in limited bit rate low spectral efficiency. In this brief, novel CI-DCSK is proposed by transmitting multiple wavelets together with parallel way. Different Walsh codes are applied to separate these so that they can share some for transmission. By removing or adding wavelets, the achieve high...

In order to expand the application of differential chaos shift keying (DCSK) technology in Internet Things, a novel ambient backscatter communication system is proposed. this system, short reference DCSK (SR-DCSK) signal ultilized as radio frequency (RF) source, and modulation waveform design can be easily generated by state transition SR-DCSK symbol according transmitted information bit, so eliminate strong direct-link interference. Furthermore, noise reduction method based on averaging...

In this brief, a multi-carrier differential chaos shift keying system capable of mitigating channel noise is proposed. system, subcarriers are allocated to the reference and data signals in an optimal way, while reduction achieved through diversity. To verify its performance, bit error rate proposed over multipath Rayleigh fading channels derived, together with detailed discussion about determination number reference-carrying subcarriers. Extensive simulations carried out for performance...

In this paper, a novel carrier index differential chaos shift keying (DCSK) modulation system is proposed for increased energy and spectral efficiencies. The new splits all data bits into two groups, which are carried by the chaotic signals their Hilbert transforms, respectively. For each group, one active subcarrier selected from candidate subcarriers according to bits, signal transmitted via carries modulated bit through DCSK modulation. By correlating with exact or filtered reference...

Abstract Reliability-based design optimization (RBDO) is receiving more attention from researchers because it can help to minimize cost reasonably in practical engineering. A large number of methods have been proposed solve RBDO problems, most which are based on the theory first-order reliability method (FORM). Therefore, deficiencies FORM limit applications general such as dependency minimum performance target point (MPTP). In this study, we apply fractional moment-based maximum entropy...