The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We consider a downlink heterogeneous network (HetNet), where several picocells coexist in the same spectrum as a macrocell. For a general framework of the multiple-input multiple-output (MIMO) network consisting of arbitrary number of picocells and macro users within the macrocell, designing a closed-form solution to achieve the degrees of freedom (DoF) of (C + K)d while guaranteeing the minimum overall...
This paper introduces a new technique for soft information relaying (SIR) which is based on a soft decode-compress-forward (DCF) relay protocol. The proposed system provides a means of using distributed low-density parity-check (LDPC) coding in conjunction with higher order (M-ary PAM) modulation, which is effective even under poor source-relay link conditions. Ordinarily, such schemes suffer from...
Heterogeneous network (HetNet) has been investigated as a promising technique for enhancing the coverage and reducing the transmit power consumption, which has emerged as a candidate for green communications. In this paper, the energy-efficient resource allocation problem for HetNet is formulated as a non-convex optimization problem which takes into account the minimum data rate requirement, practical...
We consider a general heterogeneous network in which, besides general propagation effects (shadowing and/or fading), individual base stations can have different emitting powers and be subject to different parameters of Hata-like path-loss models (path-loss exponent and constant) due to, for example, varying antenna heights. We assume also that the stations may have varying parameters of, for example,...
In this paper, a scenario is proposed where a mobile operator owning a spectrum license leases part of the spectrum to a secondary operator and also competes against it for users. Users can choose to subscribe to either operator and they subscribe the optimal amount of spectrum. This scenario is modeled using Game Theory as a two-stage game. In the first stage both operators play a one-shot simultaneous...
The global migration of television (TV) from analogue to digital broadcast will see a large amount of TV spectrum available (called TV white space — TVWS) for other services such as mobile and broadband wireless access (BWA). Leading spectrum regulation authorities, such as the Federal Communications Authority (FCC) and the Office of Communication (Ofcom) are already defined rules and policies for...
Fueled by its recent success in provisioning on-site wireless Internet access, Wi-Fi is currently perceived as the best positioned technology for pervasive mobile macro network offloading. However, the broad transitions of multiple collocated operators towards this new paradigm may result in fierce competition for the common unlicensed spectrum at hand. In this light, our paper game-theoretically...
The major concern of every spectrum sensing technique based cognitive radio networks is the accuracy of the detection. Cooperative spectrum sensing techniques exploit the diversity of the secondary users in order to enhance the reliability of the decision. In this context, fusion rules are required to derive a final decision based on the different secondary users' decisions. In this paper, the impact...
Multi-armed bandits may be used for modelling the process of selecting one among different wireless networks, given a set of system constraints typically formed by user-perceived network quality indicators. This work proposes a novel multi-armed bandit, that is made appropriate to the above context by introducing a distinction between two actions, to measure and to use, in order to better reflect...
We consider a cognitive radio setting in which a set of secondary transmitter-receiver pairs coexist with a primary user. In the channel sensing phase, each secondary system senses the primary user's channel to determine its occupancy. The existence of a fusion center enables joint processing of the sensing data. This would improve the joint sensing performance, however at the cost of a delay required...
To enable ultra-dense random deployments of fem-tocells toward the fifth generation (5G) cellular networks, effectively autonomous interference mitigation has been regarded as the key for providing unprecedented levels of network capacity and coverage. From recent research and engineering efforts, achieving this goal relies on two promising technologies of cognitive radio (CR) to fully utilize the...
The use of small cell deployments in heterogeneous networks (HetNet) environments is considered a promising strategy to cope with the explosion in mobile traffic. In the deployments, there is a concern that the large number of small cells causes the signalling load on the network nodes to increase due to frequent handovers (HOs) and mobility robustness to be degraded due to increased handover failures...
This paper proposes an inter-cell interference coordination (ICIC)-parameter-adjustment method for wireless heterogeneous cellular networks (HetNet), in which low-power nodes (such as pico base stations (BSs)) are overlaid with conventional high-power macro BS deployment. The fractional radio resource reuse (resource partitioning) scheme adopted for HetNet promises to mitigate interference from high-power...
The investments in indoor mobile networks are highly related to the spectrum availability and its associated authorization options. The aim of this paper is to discuss the differences in the spectrum demand taking into consideration both wide and local area network deployment requirements and the kind of actor that provides the indoor wireless access. The analysis covers different authorizations options...
In this paper, a method to compute macrocell almost blank subframe (ABS) duty cycles is proposed, so that the performance of macrocell users (MUEs) in a scenario with expanded-region picocells is the same or controllably larger than their performance in the same scenario without range expansion. Moreover, to make the most of the subframes overlapping with macrocell ABSs, a local load balancing algorithm...
In this paper, we address the problem of the impact of relays on the performance of a LTE-A based network. In this aim, we propose a new framework, the “fluid model for LTE-A networks with relays”. We derive from this model analytical simple formulas for the Signal to Interference plus Noise ratio (SINR), taking into account inter-cell interference, which allow to study performance of wireless networks...
Spectrum trading allows incumbents of spectrum to increase their profit margins by selling portions of unused spectrum to secondary systems. While being a spectrally efficient process; interference from secondary usage degrades the performance of the incumbent network. We propose distributed power control algorithms with incumbent protection for secondary systems which is incorporated in the incumbent's...
This work addresses the impact of sensing decision fusion rules and operative constraints on the performance of hard decision cooperative spectrum sensing schemes for cognitive radio networks. The work focuses on cooperative spectrum sensing under two sensing operating modes: the Constant False Alarm Rate (CFAR) and the Constant Detection Rate (CDR) mode. Analytical solutions for network probability...
The purpose of this paper is to study the effects on electromagnetic field levels of the green cell breathing technique in mobile networks. Although a great number of papers dedicated to QoS, radio issues and energy savings of the cell breathing algorithms have already been proposed, to the best of our knowledge, none has analyzed the effect on electromagnetic radiation. Yet, when cell sizes are changed...
Wireless Underground Sensor Networks (WUSNs) present a variety of new research challenges. For WUSNs, the goal is to establish an efficient wireless communication in the underground medium. A magnetic induction (MI) based transmission technique was proposed to overcome the very harsh conditions of the soil environment. In this paper, we investigate the potential of the MI-WUSNs if, in contrast to...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.