In this paper, the author’s present Adaptive population sizing Genetic Algorithm (AGA) assisted Maximum Likelihood (ML) estimation of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the presence of nonlinear distortions. The proposed algorithm is simulated in MATLAB and compared with existing estimation algorithms such as iterative DAR, decision feedback clipping removal, iteration decoder, Genetic Algorithm ...

Spectrum sensing techniques are useful to increase spectrum utilization in a cognitive radio network by sensing spectrum holes without harmful interference. The collaboration of sensing information among cognitive radio nodes can significantly increase the reliability of spectrum sensing. Due to hardware limitation, each cognitive radio node has to sense one narrowband channel at a time. ...

The next generation of 802.11 WLANs is expected to support Multi-User MIMO (MUMIMO) transmission, whereby parallel transmissions can be simultaneously made to multiple stations. This significantly extends the MIMO support introduced by the 802.11n standard and is, for example, included as part of the current draft 802.11ac standard that aims to support wireless data rates ...

Right now, one of your employees is accessing network resources. Do you know who it is? Recognizing and verifying access identities isn’t easy. Passwords can provide some degree of identity assurance, but they’re not infallible – anybody can write down, observe or even coerce a password from another person. In this new technical brief, you’ll ...

Consider transceiver designs in a multiuser Multi-Input Single-Output (MISO) downlink channel, where the users are to receive the same data stream simultaneously. This problem, known as physical-layer multicasting, has drawn much interest. Presently, a popularized approach is transmit beamforming, in which the beamforming optimization is handled by a rank-one approximation method called Semi-Definite Relaxation (SDR). ...

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 ...

Every day, the need for high speed reliable data transmission increases more and more. One important option is the passive optical networks which use the optical fiber and provides high data rates and long distance. This work investigates the performance of a four users Optical Time Division Multiplexing OTDM over different length of single mode ...

This paper is the study of the QPSK (Quadrature Phase Shift keying) modulation technique using AWGN (Additive White Gaussian Noise) and Multipath Rayleigh fading channel. In QPSK scheme the authors can transmit one of the 4 possible signals during each interval of signaling. WCDMA systems are based on higher modulations which provide transmission at higher ...

Preparing to migrate Lotus Notes apps to SharePoint Online/Microsoft Office 365? In this new white paper, get the “need to know” info for this resource-intensive project. Learn about pre-migration analysis, content migration, security migration, application design, and issues likely to affect this migration project. Read it today. Subscribe to the Developer Insider Newsletter From the ...

Wireless sensor network refers to a group of spatially distributed and dedicated sensors for monitoring and recording the physical conditions of environment like temperature, sound, pollution levels, humidity, wind speed with direction and pressure. Sensors are self powered nodes which also possess limited processing capabilities and the nodes communicate wirelessly through a gateway. The capability ...

When it comes to planning your network, you need to take into account the network design, security and best practices for network management. In this white paper, you’ll learn the ins and outs of planning your network, as well as potential hazards to look out for along the way. Subscribe to the Developer Insider Newsletter ...

Energy-saving is vital in a mobile network as mobile terminals are energy contingent and is one of the most important features that extends the lifetime of portable devices. Mobile WiMAX (IEEE 802.16e) addresses the issues related to energy conservation at a Mobile Subscriber Station (MSS). In this paper, a power saving mechanism involving sleep mode ...

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 existing mobile service discovery approaches do not completely address the issues of service selection and the robustness faced to mobility. The infrastructure of mobile service must be QoS-aware plus context-aware (i.e.) aware of the user’s required-QoS and the QoS offered by the other networks in user’s context. In this paper, the authors propose a ...

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 ...