We derive closed-form expressions for the single-user capacity of maximal ratio combining diversity systems taking into account effect correlation between different branches. consider a Rayleigh fading channel with two kinds correlation: 1) equal branch signal-to-noise ratios (SNRs) and same any pair branches 2) unequal SNRs arbitrary such that eigenvalues covariance matrix are all distinct. Three adaptive transmission schemes analyzed: optimal simultaneous power rate adaptation; adaptation...

Experimental studies of the long-term performance such have been done in this paper for sea water and sea-sand concrete coral sand concrete, as elastic modulus, frost resistance corrosion reinforcement behavior. The test results show that compressive modulus are slightly lower than ordinary while adding fly ash or ground slag them lead late slight increase. Compared with after freeze-thaw cycle, mass loss rate strength larger, but reduced by mixing a little high ash. Due to presence Cl-...

In this paper, the mechanical property experiments of concrete based on seawater and sea sand have been carried in different raw materials preparation conservation environments. The results show that early strength late are better than freshwater sand. There is no significant decreased for under accelerated alternating wet dry conditions. For mixed with admixture, downward trend significantly delayed, slag gets most obvious growth trend, while fly ash largest increment.

We investigate the effect of fading correlation and branch gain imbalance on Shannon capacity diversity systems in conjunction with adaptive transmission techniques. This provides theoretical upper bound for spectral efficiency schemes. obtain closed-form expressions this Rayleigh channels under four adaptation policies: optimal power rate (OPRA), constant (ORA), truncated channel inversion fixed (TIFR), complete (CIFR). give numerical examples illustrating main trends offer comparisons...

Atrial fibrillation (AF) can result in life-threatening arrhythmia, and a clinically convenient means for detecting vulnerability remains elusive. We investigated atrial by analyzing the sinus electrogram (EG) from AF animal models using phase synchronization method. Using acetylcholine (ACh)-induced acute canine (n= 4), total of 128 electrical leads were attached to surface anterior posterior atria, pulmonary veins form an electrocardiological mapping system. ACh was injected at varying...

Bolted connections are widely used in multiple engineering fields including aerospace and mechanical due to their numerous advantages like the ability bear relatively heavy loads, low costs, easy installation, implementation. Bolt looseness may lead costly disasters industries some cases of injuries. A new method for bolt detection based on average autocorrelation function is proposed. It does not usually directly extract damage feature from original response signal detect looseness, but it...

In order to maintain long-term use, satellites need be managed on-orbit. With the development of satellite technology, function and complexity payload have been greatly improved. As part on-orbit management, role management is highlighted. This article gives an analysis formation work content discusses problems encountered in monitoring. addition, according progress a pre-research topic possible directionality given.

Objective To estimate the clinical effect and long-term follow-up of minimally invasive direct coronary artery bypass grafting (MIDCAB) via left anterior small thoracotomy. Methods MIDCAB thoracotomy approach was performed in 38 cases disease with single or multi-vessel involvement from January 2002 to October 2006. There were 25 males 13 females a mean age (63. 3 ± 11.1) years old The internal mammary (LIMA) harvested under vision assistance thoracoscopy. After heparinization pericardium...

This paper investigates a joint robust scheme in secrecy relay network where distributed relays perform cooperative beamforming and friendly jammer transmits jamming signal to enhance the information security. Specifically, we consider outage constraint rate maximization design with imperfect channel state information. Through semidefinite relaxation one-dimensional search, propose two-layer optimization method solve nonconvex problem. In addition, Bernstein-type inequality large deviation...

In this work, a reconfigurable intelligent surface (RIS)-assisted multiple-input multiple-output (MIMO) system is studied with wireless energy harvesting (EH). Specifically, we focus on maximizing the harvested power at receiver by joint optimization of signal covariance, phase shifter, and splitting factor, subject to information rate transmit constraints. The formulated problem hard address due nonconcave objective nonconvex To tackle these challenges, an alternating (AO) framework...

Beamforming for satellite-borne communications systems has attracted intensive attention in the past decade as it enables frequency reuse among areas covered by different beams, and hence greatly improves bandwidth efficiency. This paper considers carrier offset estimation DSSS signals wired test of beamforming networks. A two-stage algorithm is proposed implemented, whose resource consumption far less than traditional methods based on use FFT. The first stage to employ FFT achieve a coarse...

In order to explore the effective damage identification method for structure, structural vibration signal is directly correlation dimension analyzed according fractal theory, and identified by measuring singularity in system output, then based on of response proposed. The analysis results a simply supported beam demonstrate that, proposed can accurately detect single multi different degree damage’s location alteration will increase along with