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Cloud Computing has become a significant technology trend. It is going to reshape IT processes and IT marketplace in recent years. It is grabbing the people's attention rapidly as an opportune resource of computational power as well as priced Cloud computing services save pains to maintain the computational ambience. Gradually, Cloud is bringing new possibilities for a scientific community to build...
Combining with RFID technology, Conveyor plays a very important role in modern industrial automation. However, RFID performance will be affected by many factors in conveyor application. In this paper, we build a new experimental device to test RFID performance factors of conveyor belt, the innovative aspects of our new experimental device are we adopt automated guided vehicle (AGV) instead of traditional...
An IEEE 802.11 station may become congested and experience high packet delay and possible catastrophic packet loss because it cannot win sufficient bandwidth. A channel selection algorithm allows the congested station to find another channel which has sufficient available bandwidth in order to transmit its packets without congestion. In this paper, we propose an autonomous channel selection algorithm...
Partially overlapped channels (POCs) are believed to be helpful in further eliminating interference and improving network throughput, but the interference between POCs is more complicated than that of orthogonal channels (OCs), so traditional routing metrics specifically designed for wireless mesh networks (WMNs) using OCs are not suitable for WMNs using POCs. In this paper, we propose a load and...
Content Centric Network is a clean-slate future Internet architecture, which is centered around content distribution. The In-network caching is the main feature of the new network paradigm. However, the default strategy which leaves cache everywhere in CCN results in serious cache redundancy among neighbor nodes. In this paper, we propose a Neighbor Cooperation Caching Strategy to tackle the redundancy...
To design an efficient and effective cognitive radio networks, the related technical aspects and economic aspects need to be considered. This paper addresses the spectrum trading in cognitive radio networks, where there are multiple primary services (sellers), multiple secondary users (buyers) and one agent. In the system, multiple secondary users compete with each other in terms of the spectrum demand...
An inherent problem of Fast TCP with delay-based congestion control algorithms is pointed out in this paper. The problem is, if the actual round-trip-time is inaccurately estimated by base RTT, for certain flows relative to other concurrent flows, this will subsequently result in an unfair share of the resources. A smooth function of RTT with exponential weighted by ARMA models was designed in this...
This paper studies the traffic overload control issue in the new generation electric communication network. We propose an energy-efficient traffic overload control algorithm based on genetic algorithm and hybrid particle swarm optimization. We simultaneously consider the traffic overload control and energy efficiency in the soft-switch server of new generation electric communication networks. Then...
Orthogonal frequency division multiplexing (OFDM) has attracted much attention as it is convenient to implement and robust to multiple path fading. However, the system performance of OFDM will be degraded seriously in high-speed wireless communications, since it is much sensitive to severe inter-carrier interference (ICI) caused by high-speed vehicles. Recently, a novel modified OFDM system, called...
This paper considers the combination between correlation-mapping based spreading and orthogonal frequency and code division multiplexing (OFCDM) systems. The proposed system makes use of the correlated channels to spread the transmitted bits in time and frequency domains of OFCDM systems. The input bits are regained by calculating the correlation values of the received bits. This method inherits the...
This paper presents a matching method for a antenna element. The proposed antenna is comprised of a equiangular spiral antenna, Archimedean antenna and two stubs, which printed on a Rogers Duroid 5880 substrate with εr = 2.2 and a thickness of 1.52 mm. The matching problem between antenna and a diode is well solved. The proposed antenna, covering the frequencies in the range from 0.6 GHz to 10 GHz,...
This paper proposed a novel approach of the wavelet packet transform based CME on interference suppression technology in Direct-Sequence Spread Spectrum system (DSSS). The algorithm is executed in three steps: First, we analyze the input signal by wavelet packet transform to appear the interference in the transform domain. Second, the CME algorithms complete the interference detection and delete interference...
The properties of rateless codes make it very suitable for all types of broadcast systems. In this paper, the rateless codes are adopted in the Next Generation Broadcast Network Wireless (NGB-W) system and two cooperative rateless codes are proposed for two different scenarios in NGB-W system. In the first scenario, different degree distribution functions are adopted for rateless codes encoding in...
Cognitive radios have enabled the users to utilize licensed bands opportunistically without causing harmful interference to licensed users. Spectrum analysis is an important technique in cognitive radio networks. And it helps ranking available channels using spectrum sensing results. Appropriate channel assignment decisions will be made according to the ranking results and user requirements. Here...
The massive random accesses of machine type communication (MTC) in current wireless networks (e.g. LTE-A, WiMAX) are a challenging and urgent issue. In this paper, the random access performances in LTE-A networks are first analyzed in terms of success probability, access delay, physical random access channel efficiency, and the number of retransmissions. Based on the analysis, two QoS-based optimization...
Conduction current field communication technology is a radio-communication mode, which penetrates the formation by means of radio waves, and uses the layered earth as electromagnetic wave propagation medium. On the propagation in crust, traditional wireless communication mode has the disadvantages of the serious signal attenuation and the low antenna radiation efficiency. In addition, the arrangement...
Time domain predistortion algorithms have some defects. In this paper, directly taking the outband spectrum leakage suppressing as the optimization object, we propose an algorithm for parameters identification of an predistorter by applying improved PSO (particle swarm optimization) algorithm with great generalization optimization capacity. Aiming at the problem of a large number of parameters, the...
System identification concepts play a key role in adaptive signal processing applications like communication channel estimation, acoustic echo cancellation, active noise control, and adaptive feedback cancellation. In the development of such systems, one would often like to know what kind of performance could be expected and how it depends on the filter length before actually committing the adaptive...
In order to resolve the problems of reducing the data transmission and prolonging the network lifetime of the wireless sensor network (WSN) in the case of the nodes deployed randomly, this paper puts forward a cluster compressive data gathering (CCDG) method based on pretreatment. The method can be realized through the following two steps: Firstly, the original sensor readings received from all nodes...
A novel compact multi-band Electromagnetic Band Gap (EBG) structure is introduced in this paper. Through etching four identical F-shaped slots on the surface of conventional mushroom-shaped EBG (CMT-EBG) structure, which is spiral and symmetrically distributed about the centre of EBG surface, the equivalent current path is extended while producing four resonant circuits. The simulated results present...
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