Magnetic materials have a very broad application prospect in the field of microwave absorption, among which soft magnetic become focus research because their high saturation magnetization and low coercivity. FeNi3 alloy has been widely used its excellent ferromagnetism electrical conductivity. In this work, was prepared by liquid reduction method. The effect filling ratio on electromagnetic properties absorbing studied. It is found that impedance matching ability better when 70 wt% than...

Accurate channel estimation is important for massive multiple-input multiple-output (mMIMO) to ensure good performance. Considering mMIMO application in 5G, frequency division duplexing (FDD) can provide higher data rate and wider coverage than the time (TDD) mode. However, since uplink/downlink not straightforwardly reciprocal, FDD downlink requires heavier training computation TDD mode due number of antennas. In addition, fast variation renders real even more difficult. this paper, we...

In this paper, we consider the uplink channel parameter estimation problem in presence of pilot contamination for massive multiple-input-multiple-output (MIMO) systems. We propose a parallel factor (PARAFAC)-based scheme, which exploits low-rank property MIMO channels caused by finite scattering physical environment. Specifically, first parameterize terms three parameters, i.e., fading coefficients, directions arrival (DOAs), and delays; thereby, is characterized via equivalent PARAFAC...

In this letter, we consider the channel estimation problem under pilot contamination in massive multiple-input multiple-output (MIMO) systems. We propose a novel scheme, which decomposes space supported by covariance matrix of received signals into three subspaces using factor analysis. For large number base station antennas, practically interference-free subspace is created, an accurate estimate can be obtained. The proposed analysis based scheme exploits spatial correlation to...

Mobile anchor node is used for localization in Wireless Sensor Networks. It can lower the cost of network and reduce dependence precision algorithm on density nodes. However, existing mobile node, little research detail has been done path timing sending beacon. In this article, a Anchor Node Localization based Archimedes Curve put forth, which avoids node's receipt beacon line to utmost extent due moving alone curvilinear path. addition, identification communication range time eliminate...

Compared with non-redundant manipulators, the self-motion of 7-DOF redundant manipulators results in an infinite number inverse kinematics solutions for a desired end-effector pose. This paper proposes efficient and accurate analytical solution SSRMS-type manipulators. is applicable to SRS-type same configuration. The proposed method involves introducing alignment constraint restrain decompose spatial problem into three independent planar subproblems simultaneously. resulting geometric...

Phase difference estimation is a fundamental problem in numerous applications. However, incoherent sampling (IS) an inevitable factor which degrades the precision of many correlations or Fourier transform-based approaches. In this paper, IS and spectral superposition real signals are both considered. A novel estimator developed based on modulation discrete transform (DFT). With estimated frequency, phase can be obtained by calculating four DFT samples modulated signals. Simulations...

In this paper, we present a thorough investigation of self-aligned octuple patterning (SAOP) process characteristics, cost structure, integration challenges, and layout decomposition. The statistical characteristics SAOP CD variations such as multi-modality are analyzed contributions from various features to CDU MTT (mean-to-target) budgets estimated. gap space is found have the worst CDU+MTT performance used determine required overlay accuracy ensure satisfactory edge-placement yield cut...

To improve frequency estimation accuracy, a algorithm based on cross information fusion was proposed. The suitable for signals of short duration and low signal-to-noise ratio (SNR), which are common in engineering. Firstly, several different signal groups were obtained by grouping multisegment according to the guidelines combination. Secondly, rotation factors complementary each group. Thirdly, average spectrum achieved arithmetic mean value all spectra, calculated factors. Finally,...

This article investigates the transmission of downlink control signals for multiple unmanned aerial vehicle (UAV) clusters in collaborative search and rescue operations mountainous environments. In this scenario, a reconfigurable intelligent surface (RIS) mounted on UAV is utilized to overcome obstacles between ground base station (BS) UAVs. By leveraging fixed channel RIS BS, line-of-sight (LoS) path characteristics air-to-air channel, position information UAV, forms directional beam by...

High Altitude Long Endurance (HALE) Solar UAV is integrated with a series of motor-propeller propulsion systems along the large aspect-ratio wing. These have an obvious effect on flight dynamics UAV. This paper established model for interaction between distributed and airplane, it was used to improve computation UAV’s quality, results without modified were compared. It found that wing can change its stability significantly. According result, parameters are adjusted optimize quality system efficiency.

In this paper, we propose a novel joint caching and massive multiple-input multiple-output (MIMO) transmission scheme, referred to as cache-aided MIMO, for advanced downlink cellular communications. addition reaping the conventional advantages of proposed scheme also exploits side information provided by cached files interference cancellation at receivers. This increases degrees freedom available precoding design. addition, power freed cache-enabled offloading can benefit transmissions users...

In this letter, a novel supplementary index bit aided transmit diversity (SIB-TD) approach is proposed for an enhanced discrete cosine transform based orthogonal frequency division multiplexing with modulation (EDCT-OFDM-IM) system. Specifically, conventional (IM) employed the first antenna, i.e., main branch, and non-activated subcarriers' indices in one group are utilized IM mapping on same second branch. Hence, each subcarrier can not be synchronously activated two antennas. Finally,...

In this paper, we investigate channel parameter estimation for massive multiple-input multiple-output (MIMO) systems, where a large base station (BS) antenna array is used to provide multiplexing and diversity gains. We propose Parallel Factor (PARAFAC)-based joint scheme, which exploits the low-rank property of MIMO channels caused by physical finite scattering environment. Specifically, first parameterize in terms fading coefficients, directions arrival (DOAs), delays, thereby...

Developing a new biosensing platform for the direct detection of analytes in beverages can offer significant, opportunities medical science, microbiology, nutrition studies, and food industry. Cork stoppers are widely used beverage bottles, stopper's inner sides be contact with beverages. Here, we show first time development an amperometric biosensor on cork two electrode configuration containing carbon nanotube as working Ag/AgCl reference electrode. The sensor displays sensitive hydrogen...

With the development of automobile industry, intelligent driving will become mainstream, it is an important embodiment China's development, at same time, also liberation productivity, which marks a major reform in industry. Intelligent this advanced technology vehicle identification and image processing pass road condition to computer, positioning lists position, speed other information, two complement each other, promote safe operation vehicle. This paper analyze core elements from aspects...

Because the predictive models do not match practical process, traditional functional control could acquire better performance. Through real-time database acquires process parameters, characteristic model of can be obtained using identification method. The model, as control, downlink system. Consider came from on-line identification, it process. experimental results prove that method we On-line uses NLJ which improve speed.

This paper investigates the price-based resource allocation in energy harvesting massive multiple input output (MIMO) systems. The power beacon (PB) can admit sensor nodes (SNs) to harvest from it by pricing their harvested energy. Then, SNs transmit data base station (BS) with MIMO interaction between PB and is modeled as a Stackelberg game. optimal prices, time for be obtained convex optimization algorithm. In order reduce complexity of algorithm, sub-optimal algorithm closed-form...

It is well known that accurate direction of arrival (DOA) estimation can help to improve the performance MIMO systems. However, when large scale systems are considered, DOA becomes very difficult due dimension DOAs. Based on observation correlation exists between neighboring antennas limited size antenna array, we propose a based method for multi-user (MU) system in this paper. verified proposed obtain better than existing methods with much lower computational complexity.