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.
Tactical military communication networks operate in highly complex environments. The survivability and the range of these networks, especially the mobile wireless segments, are and will be a challenge for the present and future defence forces. OPAL, an autonomous system, has been previously presented where it extended the range and improved the survivability of tactical military networks using unmanned...
In this paper, we propose a novel m-th best average biased received power (ABRP) user association (UA) scheme for K-tier heterogeneous networks (HetNets), where a user is associated with the base station (BS) having the m-th strongest ABRP. For this novel scheme, by using stochastic geometry and modeling the positions of network elements in each tier as a homogeneous Poisson point process (PPP), we...
We propose a signal-channel, adaptive threshold selection technique for binary mask construction, namely APHONIC, (AdaPtive tHreshOlding for NoIse Cancellation) for smart mobile environments. Using this mask, we introduce two noise cancellation techniques that perform robustly in the presence of real-world interfering signals that are typically encountered by mobile users: a violin busker, a subway...
With the evolution of cellular networks and the panoply of different services offered, it is crucial for mobile network operators to start planning with procedures that are simple, inexpensive and robust. In this paper we develop and present a methodology for the planning and dimensioning of UMTS network dedicated to the region of Bejaia in Algeria. The work focuses on the UTRAN since the implementation...
In mobile Cognitive Radio Networks (CRNs), the frequent link breakage and wireless interference urged the need for novel stable routing solutions. In this paper, we propose STAR, a stable routing protocol that aims at selecting interference-free and durable paths. We investigate the particular Hidden interfering Primary User (HIPU) problem caused by the un-detectable presence of the primary user in...
To satisfy the requirement of increasing mobile traffic, heterogeneous networks (HetNets) will be deployed for the fifth generation (5G) mobile communications systems. Since the deployment of base stations (BSs) in HetNets is generally dense and random, stochastic geometry has increasingly been used to analyze the performance of HetNets. Most of the existing work is based on Poisson point processes...
One of the most important factors affecting the quality of service (QoS) in orthogonal frequency division multiple access (OFDMA) networks is the intercell interference (ICI). An efficient technique for mitigating ICI is the well-known fractional frequency reuse (FFR), wherein cells are partitioned into center and edge spatial regions and different frequency reuse factors are applied to both of them...
By adopting device-to-device (D2D) communications, user terminals (UTs) can work as relays to help the cell-edge UTs with poor channel conditions obtain better network access experiences. In this paper, we characterize the D2D-assisted relay performance in the context of a cellular uplink scenario, where the UTs close to BS can act as the full-duplex relays. To obtain the system performance metric...
We design and realize an indoor visible light communication (VLC) network based on the time division mechanism to mitigate inter-cell interference, which can support flexible access and resource allocation of multiple mobile users in the ultra-dense attocell layout. WiFi is adopted for the uplink feedback, including the user ID and channel state information. After receiving feedback, the central coordinator...
Interference alignment (IA) is an efficient interference management technique that can result in sum-rates that scale linearly with the number of users at high signal-to-noise power ratio (SNR). But it is difficult to directly apply IA to large networks because of heavy signaling overhead and feasibility constraint. Clustered IA divides cells into disjoint clusters where IA is applied in each cluster...
Non-orthogonal multiple access (NOMA), which is an effective solution to improve spectral efficiency, has been considered as an emerging candidate for the fifth generation (5G) multiple access. In this paper, the authors mainly study a NOMA-based multiple-antenna relaying network over Nakagami-m fading channels. In order to measure the performance of the system, the exact outage probability and the...
Many wireless networks operate in the presence of distance-dependent path–loss in a fading environment with a Poisson interference field. In these networks, the aggregate interference can be modeled as an α-stable process with a known characteristic function. In this study, the authors revisit performance analysis of wireless systems operating in a Nakagamim fading channel. In particular, our emphasis...
4G Long Term Evolution (LTE) mobile system adopts Adaptive Modulation and Coding (AMC) as a link adaption mechanism that is based on the User Equipment (UE) periodically reporting channel condition summarised through Channel Quality Indicator (CQI) which, in turn, is based on Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP). Although CQI has a predominant role...
Digital dividend refers to the additional vacant spectrum that will be available as a result of transition from analogue to digital terrestrial television broadcasting. Wireless broadband networks such as Long-Term Evolution (LTE) can operate opportunistically in this vacant spectrum by controlling the harmful interference and overheads incurred on licensed users. With the objective of analyzing the...
While the Global Positioning System (GPS) tends to be not useful anymore in terms of precise localization once one gets into a building, Low Energy beacons might come in handy instead. Navigating free of signal reception problems throughout a building when one has never visited that place before is a challenge tackled with indoors localization. Using Bluetooth Low Energy1 (BLE) beacons (either iBeacon...
The adoption of IEEE 802.11 wireless networks has grown importantly in previous years. Recently, some vendors are developing smart access points for these networks, which are able to change their operation channel taking interference into consideration. Handoff management in wireless networks, i.e., transferring an active data session from one cell defined by an access point to another, is a critical...
Hyper-dense network is a promising solution to the high mobile video traffic. However, it has some fundamental problems. To address these issues, we propose a novel information-centric cooperative video transmission strategy in hyper-dense networks via caching. In the proposed scheme, each video file is encoded into segments using maximum distance separable rateless code. Then, a portion of each segment...
The lack of available radio spectrum and inefficiency in its usage necessitate a new communication paradigm requiring to exploit the existing spectrum opportunistically. One of the perspective spectrum sharing methods, which is currently under a heavy investigation by academia and industry as well across whole Europe, is called Licensed Shared Access (LSA). This novel technology allows for controlled...
This paper targets empirical voice and video quality assessment in mobile networks and presents fundamental QoS testing methods in correlation to RF indicators. The paper focuses on the most critical performance parameters for real-time services (e.g. voice) such as call drop vs. poor coverage in UMTS. The empirical study was based on a clearly defined drive test scenario with predetermined routes...
Feedback delay can severely impact network performance in mobile network and the theoretical quantification of performance degradation has attracted much research interest recently. In this paper, we conduct coverage analysis of mobile ultra-dense networks (UDNs) where coordinated multipoint (CoMP) technology is adopted to enhance network performance and the available channel state information (CSI)...
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.