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…
Tags: INET MANET Omnet++
An Order Optimal Policy for Exploiting Idle Spectrum in Cognitive Radio Networks
In this paper, a spectrum sensing policy employing recency-based exploration is proposed for cognitive radio networks. We formulate the problem of finding a spectrum sensing policy for multiband dynamic spectrum access as a stochastic restless multiarmed bandit problem with stationary unknown reward distributions. In cognitive radio networks, the multiarmed bandit problem arises when deciding where…
PPM demodulation schemes for IEEE 802.15.6 IR-UWB WBAN receivers
The performance evaluation of different PPM demodulation schemes employed in PPM based IR-UWB receivers designed to meet the specifications of the IEEE 802.15.6 Standard are presented. The four different PPM demodulation schemes have been investigated for the demodulation of the standard based transmitted signal specific to the PHY layer. The performance evaluation is carried out…
Dynamic restoration with GMPLS and SDN control plane in elastic optical networks [Invited]
Optical transport networks typically deploy dynamic restoration mechanisms in order to automatically recover optical connections disrupted by network failures. Elastic optical networks (EONs), currently emerging as the next-generation technology to be adopted in optical transport, introduce new challenges for traditional generic multiprotocol label-switching (GMPLS)-based restoration that may seriously impact the achievable recovery time. At the…
Lag Synchronization of Switched Neural Networks via Neural Activation Function and Applications in Image Encryption
This paper investigates the problem of global exponential lag synchronization of a class of switched neural networks with time-varying delays via neural activation function and applications in image encryption. The controller is dependent on the output of the system in the case of packed circuits, since it is hard to measure the inner state of…
A comprehensive survey of routing protocols in wireless sensor networks
A wireless sensor network is composed of multifunctional sensor nodes scattered in sensing fields. Wireless sensor networks (WSNs) are widely used in applications like Military, Environmental monitoring, Health (Scanning), Space Exploration, Smart homes, Mechanical stress levels of attached objects, disaster management etc. [30] The transmission of information is a tedious task in WSN due to…
Full duplex techniques for 5G networks: self-interference cancellation, protocol design, and relay selection
The wireless research community aspires to conceive full duplex operation by supporting concurrent transmission and reception in a single time/frequency channel for the sake of improving the attainable spectral efficiency by a factor of two as compared to the family of conventional half duplex wireless systems. The main challenge encountered in implementing FD wireless devices…
From Feedforward to Recurrent LSTM Neural Networks for Language Modeling
Language models have traditionally been estimated based on relative frequencies, using count statistics that can be extracted from huge amounts of text data. More recently, it has been found that neural networks are particularly powerful at estimating probability distributions over word sequences, giving substantial improvements over state-of-the-art count models. However, the performance of neural network…
Priority-Driven Swapping-Based Scheduling of Aperiodic Real-Time Messages Over EtherCAT Networks
Real-time Ethernet (RTE) technologies are becoming increasingly popular, as they provide high bandwidth and are able to meet the requirements of industrial real-time communications. Among RTE protocols, the EtherCAT standard is suitable for motion control and closed-loop control applications, which require very short cycle times. As EtherCAT was specifically devised for periodic traffic, aperiodic real-time…
Near field wireless power transfer and quadrature amplitude modulated (QAM) communication link
We present a near field wireless power transfer (NF-WPT) link which is also capable of datacommunication through complex, quadrature amplitude (QAM) load modulation. We present a method for designing a 4QAM constellation that allows for minimal degradation of the NF-WPT link efficiency by minimizing the complex reflection coefficient. Using a modulation board and a resonant 4-coil…