In this paper, the problem of channel estimation for Superposition Coded Modulation-Orthogonal Frequency Division Multiplexing (SCM-OFDM) systems over frequency selective channels is investigated. Assuming that the path delays are known, a new channel estimator based on modified Kalman filter algorithms is introduced for the estimation of the multipath Rayleigh channel Complex Gains (CG). In the ...

UHF RFID reader constructed by discrete components has achieved major market in many applications such as logistic, traffic distribution, asset management and industrial flow line controlling using non-battery-powered system. With the rapid growth of mobile internet service, the authors hope UHF RFID readers can be integrated into portable devices such as Smartphone, PDA and tablet ...

In this paper, the authors present a detailed analytical study of previously proposed variable preamble length-based broadcasting scheme for Wireless Sensor Networks (WSNs). Analytical results show that in dense wireless sensor networks, broad-casting a packet with a small size preamble can significantly improve the energy conservation on already limited battery powered sensor nodes. For fairer ...

Mobile stations supporting the 802.11u standard can access WLAN automatically when they are within the coverage of the network service provided by this WLAN. To achieve this goal, the stations need to keep “On” states including idle and active all the time. However, studies have noted that the idleness of stations often lead to considerable ...

In this paper, to support services differentiation, the analytical model of delay preemption based priority is developed, and an improved scheme LDPP is proposed to alleviate the over-occupancy of buffer from low priority in heavy load. The composite scheme based on preemption and small buffers is an efficient method for contention resolution. To support services ...

The Local Area Network (LAN) is used for providing data communications between various data communication devices. Automated routing control system supersedes the prior approach to LAN redundancy which provides two or more LANs and each has a Local Area Network (LAN) controller coupled to data communication devices. Devices require some software to switch between the ...

In this paper, the authors explore and compare FER (Frame Error Rate) of a MAC (Medium Access Control) layer in the IEEE 802.11 a/g/n wireless LAN. It is evaluated under the fading wireless channel, using theoretical analysis method. It is analyzed by using the number of stations with both variable payload size and mobile speed ...

With the rapid development of mobile communication and computer network technologies, the new mobile learning mode has been accepted by more and more people. In this paper, taking the learning system under mobile environment and from the perspective of necessary theoretic knowledge and relative technologies for mobile learning, the structural frame of the mobile learning ...

In this paper, the authors review the research work done on the modeling and analysis of Wireless Controller Area Network (WCAN). The Controller Area Network (CAN) has been long regarded as the pioneer in standardizing vehicle bus standard. Its influence has even been reached out to various applications in industrial automation; which includes military, aviation, ...

The hard handover algorithms used in earlier GSM networks are fairly simple but they cannot be used to support multimedia services due to high blocking probabilities. This paper presents prior determination of soft handover probability considering new direction of motion of Mobile Station (MS) coinciding with gravitation point of cells. The authors’ simulation results for ...