In this letter, we investigate the energy efficiency in generalized distributed antenna systems (GDAS) with frequency-selective fading. An efficient power allocation (EE-PA) problem, minimizing Joule consumed per bit under constraint, is formulated as a nonlinear fractional programming (FP) problem. Optimality conditions for FP problem are first introduced convex function. Then, derive analytical solutions antennas both and without transmitting at full power. Finally, general solution entire...

Wind energy is a clean source and receiving widespread attention. Improving the operating efficiency economic benefits of wind power generation systems depends on more accurate short-term speed predictions. In this study, new hybrid model for forecasting proposed. The combines variational modal decomposition (VMD), proposed improved seagull optimization algorithm (ISOA) kernel extreme learning machine (KELM) network. adopts modeling strategy: firstly, VMD used to decompose time series into...

Abstract. This study proposed a new quality control method via physical constraints and data-driven collaborative artificial intelligence (PD-BX) to reduce wind speed measurement errors caused by the complex environment along high-speed railway lines, achieving enhanced accuracy reliability. On one hand, based on special structure in assembly, constraint model of electrical catenary supports anemometers was experimentally established. The performance field simulated FLUENT software,...

In this paper, we address the problem of designing a joint scheduling and power control algorithm in downlink coordinated multi-point (CoMP) cluster supporting CoMP transmission. The objective is to maximize cell-edge throughput under per-point constraints. By an analytical derivation, binary proved be optimal solution for any given selected user group. Utilizing result, centralized semi-distributed version selection algorithms are proposed. Compared without considering transmission control,...

In this paper, we consider a static cluster of base stations where joint processing is allowed in the downlink. The partial scheme user-centric approach subclusters or active sets are dynamically defined for each user cluster. frequency selective channels, definition set thresholding can be adaptive (per resource block) non-adaptive (averaged over all blocks). Frequency improves average sum-rate cluster, but at cost an increased data interbase information exchange with respect to case. On...

This paper considers the downlink resource allocation of a coordinated multi-cell cluster in OFDMA systems with universal frequency reuse. Multi-cell joint transmission is considered via zero-forcing precoding. Furthermore, optimization user selection and power across multiple subchannels cells studied. The objective to maximize weighted sum rate under per-base-station constraints. Based on general duality theory, two iterative algorithms are proposed compared optimal solution, which...

Base station coordination is considered as a promising technique to mitigate inter-cell interference and improve the cell-edge performance in cellular orthogonal frequency division multiple-access (OFDMA) networks. The problem design an efficient radio resource allocation scheme for coordinated OFDMA networks incorporating base has been only partially investigated. In this contribution, novel algorithm with universal reuse proposed support transmission. Firstly, assumption of global between...

We present the design of simultaneous high-quality (Q)-factor and high-sensitivity (S) photonic crystal nanofiber cavities (PCNFCs) made single silica that have a low-index contrast (ratio=1.45). By using three-dimensional finite-difference time-domain method, two different resonant modes, dielectric mode (DM) air (AM), are designed optimized to achieve an ultrahigh figure merit (FOM), respectively. Numerical simulations performed study Q-factors sensitivities proposed PCNFCs. It shows for...

With the growing concern over energy consumption, green communication is becoming more and important. Lots of efforts have been put into investigating in energy-efficient wireless systems. Since Fractional Frequency Reuse (FFR) a widely-used Inter-cell-interference coordination scheme OFDMA network, we consider power control FFR system. demanded user rate constraints, aim at minimizing Joule consumed per transmission bit per-cell downlink. Based on Dinkelbach's theory, transform objective...

This paper considers the scheduling and resource allocation with adaptive modulation in downlink coordinated multi-point transmission (CoMP) systems, where multiple users are served via zero-forcing precoding simultaneously by several cooperative base stations (BSs). The joint to maximize sum rate is formulated as a combinational optimization problem under constraints. As searching space for this extremely large, which prohibits an exhaustive search (ES), genetic algorithm (GA) based...

Macro-micro networks, as typical hierarchical are advanced in increasing the network capacity well decreasing energy consumption during peak hours. However, fluctuation of traffic load over space and time brings challenges opportunities saving. In this paper, we develop both resource optimization schemes hierarchicall cell structure switchings, which rarely considered together, to lower consumption. We first proposed a radio allocation scheme minimize while satisfying given rate requirements...

The majority studies on resource allocation are based continuous power allocation. However, the transmit can be assumed as a finite set of discrete levels only, especially for practical digital cellular systems. By simply rounding up or down, conventional algorithm will not suffice. In this paper, via transmitting signal levels, multi-cell is modeled combinatorial optimization problem, which proved to NP-hard. Ant colony (ACO) applied get near-optimal solution problem. particular, multiple...

Abstract Seagull Optimization Algorithm (SOA) is an emerging intelligent optimization algorithm proposed in recent years. This paper proposes improvement the SOA based on Levy flight(LSOA), which aims to solve problems of decreasing exploration ability and easing fall into local extreme values late stage SOA. LSOA could increase diversity seagull population, improve Then selecting classic 23 benchmark functions for simulation experiments comparing with other five algorithms The result shows...

In this paper, we study the subchannel (SC) power allocation for orthogonal frequency division multiplexing (OFDM) multiple access points (APs) systems with non-coherent cooperative transmission. The objective is to maximize total capacity under per-AP constraints. It can be proved that optimal solution obtained by combination of an SC partition search and across SCs each feasible partition. Existing work exhaustively searched used Lagrange dual method compute SCs. Since entire complexity...

It is known that Coordinated Multiple Point (CoMP) transmission can increase data rates as more than one copies of signals are coordinated transmitted by multiple points. For the wideband communication system with frequency selective fading channel, optimal power allocation will be different for each block. The Water-Filling (WF) single point. However, it hard to get closed-form solution CoMP blocks point simultaneously affected other This paper analyzes coherent in block two points, and...

Purpose This paper aims to establish a lattice Boltzmann (LB) method for solid-liquid phase transition (SLPT) from the pore scale representative elementary volume (REV) scale. By applying this method, detailed information about heat transfer and change processes within pores can be obtained, while also enabling calculation of larger-scale SLPT problems, such as shell-and-tube storage systems. Design/methodology/approach Three-dimensional (3D) pore-scale enthalpy-based LB model is developed....

Abstract. This study proposed a new quality control method via physical constraints and data-driven collaborative artificial intelligence (PD-BX) to reduce wind speed measurement errors caused by the complex environment along high-speed railway lines, achieving enhanced accuracy reliability. On one hand, based on special structure in assembly, constraint model of electrical catenary supports anemometers were experimentally established. The performance field was simulated FLUENT software...

A laser Fizeau interferometer measures surface form by comparing the wavefronts reflected from a reference and under test. The measurement accuracy is limited unknown absolute error of flat. Absolute testing offers strategy to break through limitation. In this work, we propose three-flat method using minimum norm least squares solutions (MNLS). After acquiring three sets pairwise combinations among flats, one flat rotated 90° or 180° for fourth measurement. simulation demonstrates...

The safe operation of high-speed railways (HSRs) is significantly challenged by strong winds. Accurate wind speed prediction along HSRs crucial for ensuring the safety train operations. However, existing research primarily focuses on designing and improving data-driven models, with limited attention given to characteristics specific HSR environments. To address this gap, study analyzes weather stations (WSs) railway (RSs) an HSR. These are explored from multiple perspectives, including...

In this paper, we study the subchannel power allocation problem to maximize total throughput of downlink orthogonal frequency division multiplexing (OFDM) multiple access points (APs) systems with non-coherent cooperative transmission. Although has been claimed as a non-convex optimization problem, prove that duality gap between original and its dual is nearly zero when number large, which implies solving in domain. Then, solved standard Lagrange decomposition method an acceptable deviation....