In a cognitive relay network, a secondary cooperative transmission, sharing the same spectrum band with N primary transmissions, is considered. Assuming imperfect channel state knowledge of the interference channels (from secondary transmitters to primary receivers) at the secondary nodes, we investigate the problem of secondary achievable rate maximization under a constraint on the interference caused at the primary…
Tags: OMNeT++ simulator
Predictive Data Delivery to Mobile Users through Mobility Learning in Wireless Sensor Networks
We consider applications, such as indoor navigation, evacuation, or targeted advertising, where mobile users equipped with a smart-phone class device require access to sensor network data measured in their proximity. Specifically, we focus on efficient communication protocols between static sensors and users with changing location. Our main contribution is to predict a set of possible future paths…
Range Enhanced Packet Classification Design on FPGA
The future of fast Internet needs powerful routers to support abundant network functionalities, such as firewall, QoS, and virtual private networks by classifying the packets into different categories based on a set of predefined rules, so-called multi-field packet classification. Traditional packet classification that considers only 5 tuple fields is not sufficient for today’s complicated network requirements. OpenFlow switch was born to…
Perception of noise in global illumination algorithms based on spiking neural network
This paper proposes a reduced reference quality assessment model based on spiking neural network(SNN) in order to predict which image highlights perceptual noise in unbiased global illumination algorithms. These algorithms provide photo-realistic images by increasing the number of paths as proved by Monte Carlo theory. The objective is to find the number of paths that are…
Accurate and Efficient Algorithms for Cognitive Radio Modeling Applications Under the i.n.i.d. Paradigm
Given that the statistical analysis of the frequency band of interest are available, it has been shown that adaptive searching for white spaces could improve by 70% when compared with random searching. In this paper, we characterize and provide a statistical estimation of the number of channels available for opportunistic usage by secondary users (SUs)…
Performance analysis in direction oriented graded cognitive network using Bayesian model approach for path determination
Some of the challenges involved in current Internet routing are limitations of the process enabling routing techniques, handling of explosion of messages and absence of awareness about the environment. This paper presents a comparative analysis using Bayesian model of a network having a randomly distributed quality parameters when subjected to quality grading and direction oriented for optimal…
Incorporating Self-Interference Suppression for Full-duplex Operation in Opportunistic Spectrum Access Systems
Inspired by recent developments in full-duplex (FD) communications, we consider an opportunistic spectrum access (OSA) network in which secondary users (SUs) are capable of partial/complete self-interference suppression (SIS). This enables them to operate in either simultaneous transmit-and-sense (TS) or simultaneous transmit-and-receive (TR) modes, with the goal of achieving improved primary user (PU) detection and/or higher SU throughput.…
Comments on “Optimal utilization of a cognitive shared channel with a rechargeable primary source node”
In a recent paper [1], the authors investigated the maximum stable throughput region of a network composed of a rechargeable primary user and a secondary user plugged to a reliable power supply. The authors studied the cases of an infinite and a finite energy queue at the primary transmitter. However, the results of the finite…
A 340 mV-to-0.9 V 20.2 Tb/s Source-Synchronous Hybrid Packet/Circuit-Switched 16 × 16 Network-on-Chip in 22 nm Tri-Gate CMOS
A 16 × 16 mesh network-on-chip (NoC) is fabricated in 22 nm tri-gate CMOS for high-throughput, energy-efficient on-chip interconnect in multi-core processors and systems-on-chip. The NoC connects 256 nodes that are each in their own voltage and clock domain using 5-port routers and 112 b, 855 μm data links. Source-synchronous operation eliminates global clock distribution…
Spectrum Sensing of Interleaved SC-FDMA Signals in Cognitive Radio Networks
This paper develops a spectrum sensing technique for interleaved single-carrier frequency-division multiple access (SC-FDMA) systems. By designing a metric that exploits cyclostationary features of interleaved SC-FDMA signals, we establish a framework for signal detection. Using Gaussian approximation for this metric, the parameters of the metric distributions under two hypotheses are derived, and both hypotheses are…