—A cognitive interference channel consists of two single-user links, one licensed to use the spectral resource (primary) and one unlicensed (secondary or cognitive). According to the cognitive radio principle, the activity of the secondary link should not interfere with the performance of the primary. The cognitive transmitter is allowed to access the channel only when sensed idle. In this pape...

In this contribution, we consider a heterogeneous two-tiered network where a tier of cognitive self-organizing small cells is deployed over the coverage area of a preexisting orthogonal frequency division multiple access (OFDMA) macro cell. Neither crossnor co-tier cooperation or communication is established, thus no joint signal processing techniques can be implemented by the macro and small b...

A cognitive femtocell is a new small cell based on a smart home base station to solve the spectrum-scarcity problem. Recently, dedicated resource allocation for cognitive femtocells is extensively researched to mitigate the co-channel interference. However, the cognitive femtocell may suffer from the lack of frequency resource for its users due to high data traffic load of the macro cell. Inter...

Spectrum sensing is an essential enabling functionality for cognitive radio networks to detect spectrum holes and opportunistically use the under-utilized frequency bands without causing harmful interference to legacy networks. This paper introduces a novel wideband spectrum sensing technique, called multiband joint detection, which jointly detects the signal energy levels over multiple frequen...

This paper contains results on the design of optimum equalizers to eliminate intersymbol interference in linear non-minimum phase channels conveying binary signals. The optimization is with respect to an open eye condition with a given delay. For causal stable channels with non-minimum phase zeros, we argue that this problem requires only the consideration of the FIR modified channel that has a...

Communication traffic is vulnerable to timevariant wireless channel conditions such as: fading, time dispersive, or frequency dispersive distortion which can render nonadaptive communication processing ineffective. This paper surveys published wireless channel multistate hidden Markov models (HMM) revealing mature applications of HMMs and several approaches for modeling wireless channel paramet...

Dynamic spectrum access by the unlicensed secondary users (nodes) in the Cognitive Radio Network without harmful (potential) interference to the licensed users is an intelligent and efficient use of the Licensed Spectrum Bands. The nodes in a cognitive radio network(CRN) performs periodic local spectrum sensing & dynamically detects the vacant or unused spectrum around them in the form of free ...

Unmanned aerial vehicle (UAV)-enabled communication has emerged as an irreplaceable technology in military, disaster relief and emergency scenarios. This correspondence investigates the average throughput a UAV-enabled cognitive radio network, where UAV is regarded dedicated secondary user to enhance network coverage spectral efficiency. Based on probabilistic line-of-sight channel, we exploit ...