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Cooperative spectrum sensing along with censored energy detection are used in this paper with the aim of improving the efficiency of the available spectrum bands detection schemes in cognitive radio networks. Two witnesses, AND and OR fusion rules are as well considered to decide about the spectrum status based on cognitive users local observations. The analytical expressions of the probabilities...
A power and bandwidth efficient resource allocation approach considering consumer's Quality of Experience (QoE) in the context of mobile video streaming is presented. Online QoE is estimated using Fuzzy Inference Systems. Compared to Quality of Service (QoS)-based techniques, the proposed QoE-enabled approach offers considerable saving in bandwidth and power.
The study proposes a new scheme for MIMO-based ad hoc networks. This is accomplished, while using the Interference Driving Technique (IDT) over Nakagami-m fading channels with perfect channel state information at both the transmitter and receiver. The use of this technique is proposed to decrease the impact of all the unwanted interferences, routinely caused by the overlap of the defined radio transmission...
Cooperative relaying is a promising technique for present wireless communication networks such as Orthogonal Frequency Division Multiple Access (OFDMA) to satisfy high throughput demand andquality-of-service (QoS) requirements. A suboptimal relay selection, power allocation and sub carrier assignment scheme under a total power constraint is proposed for a QoS aware resource allocation for a cooperative...
This paper is concerned with the optimal association of user equipments (UEs) to the base stations, which are either a macro base station or pico base stations, for the sum rate utility in a cooperative heterogeneous network (HetNet). This is a nonconvex combinatorial problem. By recasting the problem as a d.c (difference of convex (d.c.)) program, the optimal association solution is sought by d.c...
The usage of hybrid network consisting of massive multiple input multiple output (MIMO) co-existing with small cell networks (SCNs), are considered to be a key technique for the future wireless communication systems. However, the co-existing SCNs not only require on-site hardware installation, but also increase the static power of the system thereby reducing the energy efficiency (EE). To circumvent...
In this paper, the quantity of interference on the primary user (PU) caused by the secondary user (SU) is investigated. An underlay spectrum sharing network is considered, where the different scenario of PU activity is modeled based on the duty cycle of PU channel. PU channel is classified into several activities according to the application of primary services. The interference to PU is observed...
This paper analyses the performance of an underlay cognitive radio network (CRN) over α-μ fading channels in terms of symbol error probability (SEP) and effective capacity (EC). The α-μ distribution allows for a more general fading model with an increased level of generality compared to well-known models such as Nakagami-m and Rayleigh fading. The SEP and EC at the secondary user receiver are therefore...
Scarcity of the radio frequency spectrum available for use by the vast number of wireless devices is already a challenge faced by ubiquitous communication networks, including the Internet of Things. The Cognitive Radio (CR) technology provides promising solutions to address part of such challenges. CR is based on allowing the so-called holes, the spectrums that remain unoccupied by their licensed...
With the design of data communications in mind, 3GPP Long Term Evolution (LTE) mobile network is now considered as the most promising technology for Internet of EveryThings (IoE). The IoE incorporates four pillars: people, process, data, and things. The pillars interact in a way that establishes three main connections in the IoE environment: people communicate with people (P2P), machines communicate...
Cooperation among network devices is envisioned to be a key enabler for the expected performance increase brought by the deployment of future 5G networks. In practice, new interesting opportunities for both smart signal processing and resource allocation in interference channels (ICs) are made possible by means of cooperative strategies. In this work, we propose a novel notion of cooperation for future...
In this paper, we investigate the energy procurement decision of cellular networks powered by smart grid. Multiple retailers producing energy from different sources characterized by their prices and pollutant emission levels are available to power the network. The green cellular operator, constrained by a maximum tolerated level of CO2 emissions and quality of service (QoS) requirements, has to decide...
In this paper, we propose a novel machine learning algorithm called quality of service upper confidence bound (QoS-UCB) for the opportunistic spectrum access (OSA) scenario. The proposed algorithm selects an optimal channel in terms of occupancy and quality, e.g. signal to noise ratio (SNR) for transmission. It allows secondary users (SU) to learn the spectrum not only on the vacancy point of view...
In this paper, worst-case robust beamforming to minimize the transmit power with quality of service (QoS) constraint is investigated for wireless relay networks with direct link. To be practical, channel errors are assumed for all the links including source-to-relay, relay-to-destination, and direct source-to-destination links. The signals coming from the relay link and direct link are combined by...
We study the robust security-aware beamforming optimization for cognitive interference channel with confidential messages under the imperfect channel state information (CSI) at each cognitive transmitter. The considered problem is formulated as minimizing the total secondary transmitter power under the subject of the each secondary transmitter constraint while guaranteeing the security communication...
Cloud-based radio access network is becoming significant in the future wireless network domain, since it can allow for better interference management and on-demand spectrum resource allocation. On the other hand, dense deployment of femtocell networks is also a growing trend of cellular networks due to the exponential growth of traffic demand. Meanwhile, quality of service is always a general requirement...
Femtocell enable larger network capacity by improving channel state and reducing transmission distance. Hybrid access is an efficient approach to reduce cross-tier inference so as to enhance overall network performance. In this paper, we propose a new reverse auction-based access rate allocation mechanism to maximize the utility of the femtocell access point (FAP) and the user for hybrid femtocell...
In Heterogeneous Networks (HetNets), Almost Blank Subframe (ABS) can provide interference free communication to the Cell Range Expansion (CRE) area users. Although the CRE technique is simple and guarantees a better offloading, it might not be the best way for balancing the load. In this paper, we investigate the joint optimization of the user association and the ABS ratio computation. We propose...
In this paper, the effective capacity, a link-layer model supporting Quality of Service (QoS) metrics such as user data rate, packet loss rate and service delay, is analyzed. We consider an underlay cognitive cooperative relay network (CCRN) subject to independent non-identically distributed aH fading. An analytical expression of the effective capacity is derived by means of Fox H-functions and Meijer...
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