In this paper, we consider an unmanned aerial vehicle (UAV)-enabled wireless power transfer (WPT) network, where the UAV is responsible for sustaining network with all devices on ground. The sustainable charge process operates periodically, i.e., in each working period, flies from and back to a landing position. initial remaining energy batteries battery storage limits are considered study. We assume only lifetime (RNL) known no further updates available, provide design aiming at minimizing...

For any column weight J and row L, a novel framework is proposed such that girth-eight (J,L) quasi-cyclic low-density parity-check (QC-LDPC) code with block length above lower bound can be constructed via simple inequality in terms of greatest common divisor (GCD). The main advantage the construction class QC-LDPC codes transformed into rather task, searching for integers satisfying so-called GCD constraint L. Combining new method masking matrices, type-1 presented girth at least eight....

As one of the most promising solutions, edge caching is emerging to reduce content retrieval latency and relieve huge burden on backhaul links in 6th generation (6G) millimeter wave (mmWave) intelligent vehicular networks. In this paper, we first formulate optimization problem terms request hit probability investigate two crucial factors, which impact effectiveness cache placement device-to-device (D2D) enabled mmWave Then, general mathematical expressions for with constraints capacity are...

As a bandwidth-efficient technique, bit-interleaved coded modulation with iterative demapping and decoding (BICM-ID) has attracted much research attention in the field of wireless communication. In this paper, we put forth joint design root-protograph (RP) low-density parity-check (LDPC) codes BICM-ID, referred to as RP-based BICM-ID (RP-BICM-ID), over block-fading (BF) channels so boost throughput under limited bandwidth. To preserve full-diversity property RP codes, propose an efficient...

Media platforms and devices that allow an input from a user's finger/hand touch are becoming more ubiquitous, such as Microsoft Surface DiamondTouch, well numerous experimental systems in research labs. Currently the definition of styles is application-specific each device/application has its own set available types to be recognized input. In this paper we attempt comprehensive understanding all possible for touch-sensitive by constructing design model interaction clarifying their...

For any row weight L, several novel classes of (J = 5, L) and 6, quasi-cyclic LDPC codes are deterministically constructed with girth eight. From these results, it is proved that (5, QC-LDPC eight exist for circulant permutation matrix (CPM) size P ≥ (2L + 3)(L - 1) 1, girth-eight (6, 2(L+5)(L-1)+1. The two bounds remarkably improve the existing L <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (L-1) 1 (L +1)(L-1)+1, respectively....

In this paper, we consider the constructions of type-II quasi-cyclic (QC) low-density parity-check (LDPC) codes with girth eight from a Sidon sequence. We first derive necessary and sufficient conditions guaranteeing girth-eight QC-LDPC code. By combining these concept sequence, three classes are subsequently proposed eight. To best our knowledge, second third series systematic algebraic for that have rates being greater than half and, at same time, distance upper bounds not limited to 12....

Some explicit constructions for exponent matrices which correspond to Tanner graphs with girth at least eight are proposed. From these results, any row weight of L>3, (3,L) quasi-cyclic LDPC codes constructed circulant permutation matrix (CPM) size P>L(L+mod(L,2))/2.

In this paper, the occurrence of recoil and surface warp during flat surface-straight edge hemming process is investigated. A general-purpose finite element code ABAQUS/Standard used to simulate operations. Reverse bending springback are fundamental mechanisms that cause recoil. Recoil not independent. One parameter, final equivalent warp, represent both. Pre-hemming target ending position proposed based on minimization warp. The influence geometrical parameters also discussed.

Combining powerful error-correction codes (ECCs) with multipulse pulse-position modulation (MPPM) has great potential to realize high-throughput and high-reliability transmissions in free-space optical (FSO) communication systems. This paper conducts an insightful investigation on protograph low-density parity-check (PLDPC)-coded MPPM systems over Poisson channels. To be specific, we first put forward a novel type of constellations, referred as <italic...

As a spectral-efficient and transmission-reliable technique, channel coded layered asymmetrically clipped optical orthogonal frequency-division multiplexing (LACO-OFDM) has attracted considerable interest in visible light communications. In this letter, we investigate the protograph low-density parity-check (LDPC)-coded LACO-OFDM VLC systems. Specially, design novel type of interleaving scheme, referred to as “variable-node subcarrier matched mapping (VNSMM)” optimize performance...

A high-impedance ground plane (HIGP) is used for a circular waveguide antenna. The benefits of using such HIGP are related to the suppression surface waves excited by mouth, because has very obvious wave bandgap. Suppression or reduction expected improve antenna efficiency and bring sidelobe level due diffraction waves. In agreement with result, measured radiation patterns show that 2 dB addition in gain 10 back lobes, if working frequency

A new family of quasi-cyclic low-density parity-check (LDPC) codes girth at least eight is explicitly constructed from Sidon sequences. These can be encoded using simple shift-registers. Furthermore, for short to moderate lengths these perform close random progressive edge-growth (PEG) LDPC in terms bit-error probability and block-error probability, collectively.

A new family of binary sequences is constructed by Legendre sequence with period P, P=3 (mod 4). The signal set includes two subsets consisting (P−1)/2 and (P+1)/2 codes good balance property. conjecture about the maximum over all (non–trivial) autocorrelation crosscorrelation values contained within proposed.

In delay tolerant networks, custody transfer can provide certain degree of reliability as a custodian node cannot discard message unless its life time expires or the is transferred to another after commitment. This creates challenging decision making problem at in determining whether accept transfer: on one hand, it beneficial large number messages potentially advance toward their ultimate destinations and network utilization be maximized; other if receiving over-commits itself by accepting...

From Sidon sequences, two explicit methods for constructing (2J, 2L)-regular type-II quasi-cyclic (QC) low-density parity-check (LDPC) codes are proposed without four cycles. The advantage of the new is two-fold: (i) compared with existing lower bound circulant permutation matrix (CPM) sizes above which QC-LDPC exist cycles, novel constructions enable much tighter bounds; and (ii) constructed by first method perform almost as well from perfect cyclic difference set, while possessing a more...

We consider a fully-loaded ground wireless network supporting unmanned aerial vehicle (UAV) transmission services. To enable the overload transmissions to user (GU) and UAV, two schemes are employed, namely non-orthogonal multiple access (NOMA) relaying, depending on whether or not GU UAV served simultaneously. Under assumption of system operating with infinite blocklength (IBL) codes, IBL throughputs both derived under schemes. More importantly, we also scenario in which data packets...