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.
Duality relations among achievable QoS parameters help us transform the problems in the broadcast channel to convex problems in multiple access channels. But a multiple access channel being considered as dual of a broadcast channel must exploit the additional freedom of power allocation traditionally considered only in a broadcast channel. This work proposes a novel algorithm for optimising the sum-capacity...
In the wireless mobile communication system, the performance of system throughput is seriously affected by the interference, which can be divided into intra-cell and inter-cell interference. Intra-cell interference could be refrained by orthogonal frequency-division multiple-access (OFDMA). Coordinated multipoint (CoMP) transmission is an effect way to decrease inter-cell interference. A CIWF algorithm...
Contractive interference functions introduced by Feyzmahdavian et al. is the newest approach in the analysis and design of distributed power control laws. This approach can be extended to several cases of distributed power control. One of the distributed power control scenarios wherein the contractive interference functions have not been employed is the power control in MIMO systems. In this paper,...
This paper approaches the deadlock prevention problem for the well known class of S3PR used in Resource Allocation Systems. The proposed control policy is based on inhibitor arcs and the new Petri net class will be called S3PR2. The liveness characterization of this new class is given. The main application of the approach is to robot motion for a team of robots evolving in a partitioned environment...
Improving cell coverage and network capacity are main issues in LTE networks. By the emergence of heterogeneous cellular networks with different cell size, femtocells have been regarded as a low cost solution to improve poor indoor coverage for home users. However, as Femto Access Points (FAPs) are installed by users, self-organized techniques are needed for allocation of radio resources to femtocells...
The OceanRINGS is a suite of smart technologies for subsea operations developed over the last ten years at the Mobile & Marine Robotics Research Centre (MMRRC), University of Limerick, Ireland. Applied to mini ROVs, OceanRINGS technologies enable remote presence: long endurance robotic systems for routine inspection of offshore subsea oil & gas installations and marine renewable energy devices...
Here we study a generalization of linear regression to the case of maximal elements of a general fairness relation. The regression then is based on balancing the distances to the data points. The studied relations are lexicographic minimum, maxmin fairness, proportional fairness, and majorities, all in a complementary version to represent minimality. A new combination of proportional fairness and...
Limited to the traditional digital transmission design which forces the source to pick a single bit rate supported by the worst receiver to transmit data, the mobile video broadcast service cannot provide better video qualities to the receivers with better channels. This paper proposes an analog coding and transmission scheme named Realcast to provide channel adaptive video broadcast service. It utilizes...
Common conceptualizations of trust concern expectations about the future behavior of an entity. We focus on expectations about fair future behavior: this aspect was insufficiently formalized to date, prohibiting formal reasoning about fairness. In this paper, we extend our previous binary fairness model to a gradual one. We demonstrate the capabilities of gradual fairness in two scenarios: "distributing...
This paper developed a joint power allocation and beamforming scheme to minimize the energy consumed per bit transmitted of the non-regenerative two-way multiple input multiple output (MIMO) relay network, while satisfying the QoS requirement of the two sources. Due to the non-convexity, the objective problem is decomposed into two sub-problems: transmit power allocation and transceiver beamforming...
We consider a scenario that device-to-device (D2D) communication is enabled in a cellular network. The licensed spectrum of the macro-cell operator is divided into sub-bands, which are able to be leased to the unlicensed subscribers to perform D2D communication. The licensed subscribers of the macro-cell in the shared sub-bands are protected by the maximum tolerable interference level constraint,...
Multiuser MIMO (MU-MIMO) in general, and block diagonalization (BD) in particular, has become a crucial mechanism towards the achievement of a higher spectral efficiency in OFDMA-based wireless networks. The utilization of such techniques necessarily have implications in the resource allocation processes in charge of assigning subcarriers, powers and transmission modes among the different users. In...
The mutual information of a MIMO wireless channel, impaired by memoryless phase-noise, is characterized. Both a Line-of-Sight (LOS) MIMO link and a downlink channel with multiple-antenna base station (BS) are studied. For both cases, closed-form approximations of the mutual information in the low-SNR regime are derived. Next, leveraging the obtained approximations, power control policies for achievable...
Ultra network densification is considered a major trend in the evolution of cellular networks, due to its ability to bring the network closer to the user side and reuse resources to the maximum extent. In this paper we explore spatial resources coordination as a key empowering technology for next generation (5G) ultra-dense networks. We propose an optimization framework for flexibly associating system...
The focus of this work is put on a cognitive network wherein the secondary users (SUs), based on bit-interleaved-coded orthogonal frequency division multiplexing, share the same band of primary users (PUs). In this context, we develop a distributed power allocation (PA) strategy which minimizes the coded packet error rate (PER) of the noncooperative SU links under the constraint of satisfying the...
Job scheduling is a challenging task in terms of execution time, which is usually minimised to accomplish dead-lines in diferent areas. However, cost optimization is a conflictive objective when the execution time is optimized, because usually expensive resources are the fastest ones. In this paper, we present a multiobjective algorithm based on the brain storming process that human groups carried...
Quality of service (QoS) requirements are usually different from user to user in a multiaccess system, and it is necessary to take the different requirements into account when allocating the shared resources of the system. In this paper, we consider one QoS criterion-average packet delay in a multiaccess system, and we combine information theory with queueing theory in an attempt to analyze whether...
Text documents are often high dimensional and sparse, it is a great challenge to discover the clusters among the unlabelled text data, because there are no obvious clusters by common distance measure. In this paper we present a latent subspace clustering method to find text clusters. In our algorithm, we use latent factors extracted by probability latent semantic analysis (PLSA) to generate latent...
Compared with VSM (Vector Space Model) and graph-ranking models, LDA (Latent Dirichlet Allocation) Model can discover latent topics in the corpus and latent topics are beneficial to use sentence-ranking mechanisms to form a good summary. In the paper, based on LDA Model, a new method of sentence-ranking is proposed. The method combines topic-distribution of each sentence with topic-importance of the...
In this paper, we examine distributed and fair resource allocation for weighted sum multicell capacity maximization in multi-input single-output (MISO)-Orthogonal Frequency-Division Multiple Access (OFDMA) multicell systems with reduced feedback links. We apply zero forcing (ZF) precoding to reduce interference between the users in the same cell and then propose iterative distributed power allocation...
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.