In this paper, cooperative spectrum sensing under perfect and imperfect feedback channels is investigated. In particular, the optimal number of cognitive radios (CRs) required to minimize the total error of the sensing process when a perfect/imperfect reporting channels is derived. We show that the total error is always greater than zero regardless of the number…
Omnet++ Simulator
On the Two-User Interference Channel With Lack of Knowledge of the Interference Codebook at One Receiver
In multiuser information theory, it is often assumed that every node in the network possesses all codebooks used in the network. This assumption may be impractical in distributed ad hoc, cognitive, or heterogeneous networks. This paper considers the two-user interference channel with one oblivious receiver (IC-OR), i.e., one receiver lacks knowledge of the interfering cookbook,…
Spectrum awareness and exploitation for Cognitive Radio Satellite Communications
The Digital Agenda for Europe (DAE) sets forth ambitious requirements for broadband communications, in which Satellite Communications (SatCom) play a major role. In this context, spectrum sharing techniques offer unprecedented opportunities to increase capacity and reduce costs in order to allow SatCom to meet the DAE objectives. The EU FP7 Project CoRaSat is assessing Cognitive…
Duplex mode selection and channel allocation for full-duplex cognitive femtocell networks
In this paper, we investigate the problem of incorporating full-duplex (FD) transmission in cognitivefemtocell networks (CFN) to achieve higher spectrum utilization. We aim to maximize the sum rate of a full-duplex cognitive femtocell network (FDCFN) as well as guaranteeing the quality of service (QoS) of users in the form of a required signal to interference…
Interference and X Networks With Noisy Cooperation and Feedback
The Gaussian K-user interference and M × K X channels are investigated with no instantaneous channel state information at transmitters (CSIT). First, it is assumed that the CSI is fed back to all nodes after a finite delay (delayed CSIT), and furthermore, the transmitters operate in full-duplex mode, i.e, they can transmit and receive simultaneously.…
Throughput Analysis of Cooperative Communication in Wireless Ad HocNetworks With Frequency Reuse
In this paper, we investigate the network throughput achieved by both spatial diversity and spatial frequency reuse in a wireless ad hoc network with randomly positioned single-hop source-destination pairs and relays. Compared with conventional direct transmissions, cooperative communication can enhance single-link transmission reliability but reduce network-wide spatial frequency reuse due to relay transmissions. To study…
A Novel Low-Complexity Numerical Localization Method For Dynamic Wireless Sensor Networks
The localization of distributed and wirelessly connected sensor system is of decisive importance for many applications. This paper focuses on the range-based localization and tracking problem for very large dynamic, i.e. moving sensor networks. We study the inexorability of underwater systems with massive swarms of tiny sensors with reduced and restricted capabilities. In this context,…
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…
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…
Sophisticated Traffic Lights Control using Neural Networks
This research work presents the previous results of implementing autonomous traffic light control system based on sophisticated agents to overcome problems like congestion, pollutant emissions and fuel consumption in modern cities. The proposed agent based approach uses back propagation neural networks to provide green light intervals according to the demand level of the intersection. The…