This paper introduces a novel formalism to improve the performance of an off-body system by deploying multiple ultra wideband (UWB) antennas, positioned strategically on the body. A methodology is presented for determining the optimal positions of UWB antennas on the body, necessary to provide a reliable multiband orthogonal frequency division multiplexing (MB-OFDM) UWB diversity antenna system operating in…
Tags: OMNeT++ Projects
Re-Dimensioning Number of Active eNodeBs for Green LTE Networks Using Genetic Algorithms
With the tremendous growth of cellular networks, energy consumption reduction has become a critical requirement. Recent research has focused on the base station as the main constituent that drains the highest percentage of energy consumption within cellular infrastructures. In LTE, the predominance of data traffic might result in significant volatility in traffic loads across evolved Node…
Blockage Robust and Efficient Scheduling for Directional mmWave WPANs
With the increase in emerging bandwidth-intensive applications, millimeter-wave (mmWave) communications in 60-GHz band have become a hot topic. There are two unique features that sharply distinguish mmWave wireless personal area networks (WPANs) from other networks using lower carrier frequencies. First, mmWave links use high-gain directional antennas to overcome the high propagation loss. Second, mmWave links are easily blocked by the human body and furniture.…
Investigation of Diagonal Antenna-Chassis Mode in Mobile Terminal LTE MIMO Antennas for Bandwidth Enhancement
A diagonal antenna-chassis mode is investigated in long-term evolution multiple-input-multiple-output (LTE MIMO) antennas. The MIMO bandwidth is defined in this paper as the overlap range of the low-envelope correlation coefficient, high total efficiency, and -6-dB impedance matching bandwidths. Utilizing the diagonal mode analysis, the MIMO bandwidth of the collocated MIMO antennas is improved efficiently at the…
Experimental Demonstration of Datacenter Resources Integrated Provisioning Over Multi-Domain Software Defined Optical Networks
Due to the emergence of cloud computing and various cloud services which are remote and geographically distributed, datacenters interconnected by optical networks have attracted much attention of network operators and service providers. With the purpose of supporting cloud services more effectively and efficiently, IT resources and interconnected network resources provisioning could be considered in an…
Realization of congestion in software defined networks
Software defined networking[1][9] has brought a rapid change in networking industry by providing programmability and abstraction. it also enables centralization of control in infrastructure. In this paper, we describe the results of our experiment to determine the performance of SDN by simulating Open vSwitch under conditions of congestion. We did experiments on MININET by creating four compute nodes and…
A Framework for Security Services Based on Software-Defined Networking
This paper proposes a framework for security services using Software-Defined Networking (SDN) and specifies requirements for such a framework. It describes two representative security services, such as (i) centralized firewall system and (ii) centralized DDoS-attack mitigation system. For each service, this paper discusses the limitations of legacy systems and presents a possible SDN-based system to protect network resources by controlling…
Geospatial ontology-based mission assignment in Wireless Sensor Networks
Wireless Sensor Networks (WSNs) have been a focus for research in recent years. They enable data gathering across a wide range of domains and areas of interest from health service to environment monitoring, security, etc. Sensors are becoming cheaper, and as a result are being deployed in high density, at the same time; users’ requirements…
Architecture of a Fully Pipelined Real-Time Cellular Neural Network Emulator
In this paper, architecture of a Real-Time Cellular Neural Network (CNN) Processor (RTCNNP-v2) is given and the implementation results are discussed. The proposed architecture has a fully pipelined structure, capable of processing full-HD 1080p@60 (1920 × 1080 resolution at 60 Hz frame rate, 124.4 MHz visible pixel rate) video streams, which is implemented on both…
Exact Convex Relaxation of Optimal Power Flow in Radial Networks
The optimal power flow (OPF) problem determines a network operating point that minimizes a certain objective such as generation cost or power loss. It is nonconvex. We prove that a global optimum of OPF can be obtained by solving a second-order cone program, under a mild condition after shrinking the OPF feasible set slightly, for…