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The ever increasing traffic demand is becomming a serious concern for mobile network operators. In order to solve the traffic explosion problem, there have been research efforts on offloading the traffic from cellular links to local communications among users. In this article, we leverage opportunistic device-to-device sharing, exploit the social impact among users in social network services (SNSs),...
This paper mainly analyzes the outage capacity and bit error probability (BEP) of the distributed antenna system (DAS) with antenna selective transmission over shadowed Nakagami-m fading channels. Due to the complexity of shadowed channel fading, we propose a gamma-gamma distribution to approach the composite fading environment. Then, generalized analytical expressions of outage capacity and BEP are...
The main focus of this paper is to investigate the downlink outage probability of the distributed antenna system (DAS) over shadowed Nakagami-m fading channels. In the analysis, by making use of the moment generating function (MGF), this paper first derives the probability density function (PDF) of the output signal to noise ratio (SNR) after maximal ratio combining (MRC) at the receiver. Further,...
This paper analyzes the outage probability of the downlink distributed antenna system (DAS) with selective transmission (ST) scheme and maximum ratio combining (MRC) over shadowed Rayleigh fading channels. Firstly, the probability density function (PDF) is derived for the output signal to noise ratio (SNR) after MRC at the receiver. Then, under the ST scheme, an approximate analytical expression of...
This paper presents the analysis and implementation of a PLL structure for single-phase grid-connected system. By comparing two different PLL structures based on SRF (synchronous reference frame) and p-q (instantaneous reactive power) theory respectively, a simplified control model of the PLL system is developed. This paper also analyzes the generation of the orthogonal voltage system based on SOGI...
An interleave buck converter with coupled inductor is proposed in this paper. Continuous input current, low input and output ripple current, good transient response are realized with the proposed converter. Detailed analyses and simulations are presented. Experimental results meet them very well.
This paper investigates the channel capacity of the distributed antenna system (DAS) over shadowed fading channels. To facilitate the analysis, the distribution of the received signal to noise ratio (SNR) is approximated firstly by a log- normal distribution. Then, by using Gauss-Hermite integration, an approximate analytical expression of the channel capacity is derived for the downlink of DAS. The...
In this paper, we introduce and study a new system of variational inclusions with (A, eta) accretive operators in real q-uniformly smooth Banach spaces. By using the resolvent operator technique associated with (A, eta) accretive operators, we construct some new iterative algorithm for approximating the solution of this system of variational inclusion. And we prove the existence and uniqueness of...
College life is quite different from that of middle school. Most students cannot adjust well to it differently after entering. It is responsible for not only professional moral tutors but also teachers to help undergraduates to adapt themselves to undergraduate courses and life. To have a correct attitude towards classroom education management and do well in it is crucial to improve the professional...
In this paper, we investigate the use of cooperative communications for reliable data dissemination in wireless sensor networks. We first identify the disadvantages of some existing cooperative schemes. While the previously proposed ldquomulti-hop mesh cooperative transmission structurerdquo addresses these disadvantages, it suffers from large end-to-end delays during data disseminations due to its...
Mobile WiMAX (IEEE 802.16e) is an emerging technology for wireless broadband access network. It provides wider converge and higher bandwidth than conventional wireless technologies. Multicast and Broadcast (M&B) in WiMAX are suitable for multimedia applications such as Pay-TV system because multimedia providers can efficiently distribute the same contents to the users within the same M&B group...
It is of theoretical and practical significance to determine the number of roots in a certain range of a polynomial by an explicit criterion. Positive roots discrimination system for polynomial is a set of explicit expressions in terms of the coefficients, which is sufficient for determining the numbers of the positive roots. We give a new explicit criterion to determine the number of positive roots...
In many fields such as computer animation, computer graphics, machine vision, robotics, virtual reality and CAD/CAM, it is a common problem to detect the positional relationship between two planar conics. Based on the generalized characteristic polynomial and the affine invariants of two conics, explicit conditions are derived for classifying the various positional relationships between an ellipse...
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