We consider multi-receiver networks with diversity reception from an information-theoretic point of view. In particular we nd their capacity and investigate how the frequency spectrum should be allocated to the users. We conclude that eecient transmission schemes cannot be built based on re-use partitioning and therefore advocate a spread spectrum approach. We also show that diierences in recei...

Due to the growing demand of wireless spectrum the Cognitive Radio (CR) is used for the spectrum utilization purpose. Basically the Licensed users use the licensed bands but with the help of CR technology, the licensed bands can also be provided to see users. The main aim of cognitive radio is to sense the spectrum continuously. In this paper, we provide theproposal that how the capacity of the...

Multicarrier waveforms have been commonly recognized as strong candidates for cognitive radio. In this paper, we study the dynamics of spectrum sensing and spectrum allocation functions in cognitive radio context using very practical signal models for the primary users (PUs), including the effects of power amplifier nonlinearities. We start by sensing the spectrum with energy detection-based wi...

Inspired by new developments in dynamic spectrum access, we study the dynamic pricing of wireless internet access when demand and capacity (i.e., available bandwidth) are both stochastic. The demand for wireless internet access has increased enormously in recent years. However, the spectrum available to wireless service providers is limited. The industry has thus expanded conventional license-b...

We present a systematic study of the dynamical scaling process leading to the establishment of the Kolmogorov–Zakharov (KZ) spectrum in weak 3-wave turbulence. In the finite capacity case, in which the transient spectrum reaches infinite frequency in finite time, the dynamical scaling exponent is anomalous in the sense that it cannot be determined from dimensional considerations. As a consequen...

Current allocation of the spectral bands to only licensed users leads to inefficiencies in spectrum utilization. Designing realistic cognitive radios that are capable of sensing spectrum holes is the key to solve this problem and to increase the capacity of next-generation wireless networks. In this paper, we propose convolutional neural networks for predicting the spectrum holes from a data se...

This paper investigates a new spectrum sharing algorithm based on price in cognitive radio networks. A supply and demand model between primary users and secondary users is established to decide the price of free spectrum leased by primary users. Considering the utility of primary users and the total bandwidth while deciding the price per bandwidth using supply and demand balance (the spectrum s...

Recent years have seen significant interest in using the multihop wireless networking paradigm for building mesh networks, ad hoc networks, and sensor networks. A key challenge in multihop wireless networks is to provision for sufficient network capacity to meet user requirements. Several approaches have been proposed to improve the network capacity in multihop networks, ranging from approaches...

Children with autism are said to be poor mind readers: They have a limited understanding of the role that mental states play in determining emotions and behavior. In this research, 23 high-functioning children from the autistic spectrum (M age 9 years 3 months), 42 6-year-old controls, and 43 10-year-old controls were presented with six emotion-evoking stories and they were asked to explain pro...

we define a new type of spectrum, called δ-approximate spectrum, of an element a in a complex unital banach algebra a and show that the δ-approximate spectrum σ_δ (a) of a is compact. the relation between the δ-approximate spectrum and the usual spectrum is investigated. also an analogue of the classical gleason-kahane-zelazko theorem is established: for each ε>0, there is δ>0 such that if ϕ is...