The network-on-chip (NoC) system can provide more scalable and flexible on-chip interconnection compared with system bus. The performance of on-chip adaptive routing algorithms greatly relies on the adopted network information. To the best our knowledge, previous routing algorithms utilize either spatial or temporal network information to improve performance. However, few works have established a framework on analyzing the network information nor showed…
Tags: INET MANET Omnet++
Flowshadow: a fast path for uninterrupted packet processing in SDN switches
Updating rules in the flow tables of SDN switches are complex and time-consuming. Therefore, we propose a cache-based scheme (named FlowShadow) to improve the packet processing performance and keep continuous operating while updating rules in the flow tables. FlowShadow caches the microflows in the hash table to build a fast path for packet processing. By…
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)…
Optimum welch FFT segment size for duty cycle estimation in spectrum awareness system
In order to realize practical dynamic spectrum access (DSA), implementing spectrum sensing with reasonably low cost is very challenging due to the required detection accuracy and quickness. For this issue, we have introduced an extended DSA, smart spectrum access (SSA), where any useful information in terms of spectrum utilization, such as statistics regarding spectrum utilization,…
Outage Analysis of ZFB-MRT/MRC Underlay Two-Way Relay Systems
We analyse the end-to-end (E2E) outage probabilities (OPs) of zero-forcing beamforming and maximal-ratio-transmission/combining (ZFB-MRT/MRC) for an underlay network, which consists of a single-antenna fixed-gain amplify-and-forward (AF) two-way relay and two multi-antenna terminals. Assuming both path loss effects and small-scale fading and considering both secondary-to-primary (S2P) and primary-to-secondary (P2S) interferences, the exact and asymptotic E2E OPs are…
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…
Search in Combined Social and Wireless Communication Networks: Delay and Success Analysis
This paper models and analyzes the problem of search (navigation) with local information in combined social and wireless communication networks. Social networks are modeled with short-range and long-range connections representing smallworld and scale-free network characteristics. By distinguishing the delay and success probability on different link types, the end-to-end delay distribution and success probability are first…
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…