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.
The inclusion of a previously non-existent traffic class required by the Smart Grid poses many difficulties on OFDMA based wireless communication systems. In this paper, we develop a resource allocation algorithm based on the ecological research Lotka-Volterra equations. Each class of traffic is modelled as a species and they compete over the telecommunications resources. Constraints were then placed...
The results of development a mathematical model for transmission rate allocation downlink technology WiMAX. The novelty of the proposed model is possible preventive limit transmission rate allocated to the service flows of the user stations in the downlink by using the WiMAX technology linear or linear-quadratic objective function. Using the mathematical model is directed to allocation between subscriber...
In order to face the steady growth of the optical networks, network operators are now moving to elastic optical networking, with the challenge of optimizing the spectrum usage through the so-called routing and spectrum assignment (RSA) problem. It is a much more difficult problem than the classical routing and wavelength assignment (RWA) problem, for which practical algorithms are now available for...
Increasing demand by wireless communication applications for spectrum bands predominately occupied by radar applications has led to challenging resource allocation issues in the congested spectrum environment. A new resource allocation scheme based on Marginal Fisher's Information (MFI), is proposed to address the issue of spectrum congestion. Using MFI, which in some cases is identical to integrated...
In this paper, we consider the problem of minimizing the total transmit power with power control and resource allocation in OFDM networks where mutual interference exists among cells. The signal-to-interference-and-noise-ratio (SINR) relation is interpreted by the load and power coupling model, where every resource is available for each user with a probability. These probability variables can be also...
The major challenge in the wireless communication networks is the efficient utilization of the limited resources while maintaining the target quality of service (QoS). In this paper we propose a new algorithm for joint uplink and downlink resource allocation in an OFDM wireless network. In the new algorithm we take both best effort and real traffic classes of service into consideration. The total...
To prolong the network lifetime, the energy usage of the nodes must be balanced in cooperative orthogonal frequency division multiplexing(OFDM) system with decode-and-forward(DF) protocol. In this paper, the system objective is minimize the total energy cost of the source and the relay. Then optimal resource allocation method based on dual decomposition is presented to resolve the system model. Simulations...
The results of development of a mathematical model for time-frequency resource allocation in the LTE technology downlink using Resource Allocation Type 1 are given. Using the proposed model allows taking into account the technological features of the LTE downlink (splitting the resource blocks into subsets, allocation of RB of only one subset to user equipment), as well as territorial remoteness of...
Available approaches to solving the problem of frequency resource distribution in the wireless mesh-networks with WiMAX technology are analyzed; the requirements of the systems nature on the structure and contents of the frequency resource distribution mathematical model are stated on the basis of these approaches. The frequency resource distribution mathematical model is offered as a problem of subchannels'...
In this paper, resource allocation for OFDMA system with proportional rate constraints is studied. The objective is to optimize subcarriers and power allocation in order to maximize sum capacity subject to the constraints of total power and proportionality among users' capacity. Optimal solution to the constrained fairness maximization problem is extremely computationally expensive. Previous works...
In this paper, cooperative multicast with the help of short-range data sharing is studied in the cognitive radio networks (CRNs). The original multicast data is split into many segments, and the transmission of each segment is divided into two stages. In the first stage, cognitive base station transmits each segment to the corresponding cooperative user, and in the second stage, the cooperative user...
Wavelet Packet Modulation (WPM) is a multicarrier modulation. The subcarrier allocation and the corresponding power allocation are capable of leveraging the merits of WPM-based multi-user systems to improve system channel capacity. However, the resource allocation in WPM-based systems has never been investigated. Hence we propose in this paper the first resource allocation scheme for WPM-based Cognitive...
This paper presents an application of game theory for dynamic spectrum access in cognitive radio. The potential game was analyzed in mesh network which is based on the ortogonal frequency division multiplexing. The gain channel is calculated according to the observed propagation model developed for macro-cells in urban area. The power allocation on the subcarriers was performed by optimizing water-filling...
We investigate an outage optimal adaptive resource allocation scheme for the upstream of two-hop OFDMA based decode-and-forward cooperative relay systems. The objective of this work is to design resource allocation strategy, which addresses the needs of the users minimizing their outage probability. This scheme utilizes the subchannel-pairing and proportional fairness in two-hop multiuser multirelay...
In this paper, we consider a two-phase traffic-aware adaptive resource allocation (T-ARA) scheme to mitigate inter-femtocell interference in dense-deployed femtocell environments for LTE system. The proposed scheme consists of the long period allocation (LPA) strategy and the short period allocation (SPA) strategy. The quasi orthogonal bandwidth is assigned to femtocell in the LPA strategy to suppress...
Future cognitive radio broadband wireless networks are expected to support a variety of communication services with diverse quality-of-service (QoS) requirements. Multimedia applications such as broadband voice transmission and real-time video streaming are very delay-sensitive and need guaranteed throughput. On the other hand, applications like file transfer and email services are relatively delay...
We apply constrained optimization techniques to optimally allocate the bandwidth and power to the users in a cellular network. We investigate partial frequency reuse with multiple users in the full and partial frequency regions for inter-cell interference mitigation. We show that the non-convex sum-rate maximization problem becomes convex under certain simplifying assumptions. Moreover, an efficient...
Mathematical model of multi-user power control and resource allocation in cognitive OFDM system is investigated. Multi-user resource allocation with the target of maximizing the cognitive user's transmission rate and satisfying the proportional rate constraint between cognitive users is proposed in the condition of primary user's interference constraint. The paper supposes that cognitive transmitter...
Orthogonal Frequency Division Multiplexing (OFDM) is very sensitive to carrier frequency offsets (CFO). The CFO results in intercarrier interference (ICI). This drawback of OFDM is inherited to Orthogonal Frequency Division Multiple Access (OFDMA). In this paper, we propose a new ICI model for an uplink OFDMA system that takes into account the presence of the cyclic prefix which is usually ignored...
We propose a novel distributed and low complexity joint channel and power allocation scheme for the uplink of multi-cellular multi-carrier systems. The algorithm is based on the min-sum message passing (MP) scheme that entails passing messages between the base station (BS) and mobile terminals (MTs) with the aim of achieving a low power consumption resource allocation while respecting rate constraints...
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.