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Cooperative cognitive radio (CR) improves quality of service (e.g. rate) of primary users by cooperative transmission from secondary uses. However, as owners of the spectrum, primary users' traffic demands are relatively easy to be satisfied. The rationale is that they would be more interested in the benefits of other format (e.g. revenue), instead of the enhanced rate. In this paper, we propose a...
We consider the problem of embedding multiuser data in digital media (such as images, video sequences, audio) with minimum perceived distortion. In this direction, we find the orthonormal set of embedding carriers that achieves maximum sum signal-to-interference-plus-noise ratio (sum-SINR) at the output of the receiver linear filters for any fixed embedding amplitude values. Then, for any given total...
We address the problem of energy efficiency maximization for multi-antenna downlink broadcast systems. The proposed transmission algorithm calculates the optimal pre-coding matrices, power allocation, and solves the user subset selection problem that is most energy efficient while satisfying the Quality of Service constraint of the network. Both zero-forcing beamforming scheme and dirty paper coding...
We propose a multi-timescale interference mitigation scheme for massive MIMO cellular networks. The MIMO precoder at each base station (BS) is partitioned into an inner precoder and an outer precoder. The inner precoder controls the intra-cell interference and is adaptive to local channel state information (CSI) at each BS (CSIT). The outer precoder controls the inter-cell interference and is adaptive...
This paper considers a multi-input multi-output (MIMO) wireless relay network, where the source S communicates wirelessly to the destination D via the help of a nonregenerative relay R. Previous studies are almost exclusively based on the assumptions of equal time-duration phases for S-R and R-D transmission and equal number of multiple antennas for every node, and the results concerning arbitrary...
In this paper, we investigate the interference mitigation in femtocell networks, where femtocell access points (FAPs) are allowed to cooperate as different cooperative groups to allocate resources. We model the femtocell cooperation characteristics as a coalition formation game in partition form with non-transferable utility. Furthermore, a distributed coalition formation algorithm is proposed to...
In multi-cell long term evolution (LTE) networks, the load levels that represent the cells' resource consumption are coupled due to mutual interference. The coupling relation forms a non-linear system, in which one cell's load governs the interference seen by the other cells. For heterogeneous networks with shared resource, load coupling takes place within the macro cell and small cell layers, as...
This paper considers downlink multicast transmit beamforming for secure layered transmission systems with wireless simultaneous information and power transfer. We study the power allocation algorithm design for minimizing the total transmit power in the presence of passive eavesdroppers and energy harvesting receivers. The algorithm design is formulated as a non-convex optimization problem. Our problem...
The increase of antennas can greatly improve the performance of MIMO systems, in the meanwhile, the precise channel state information is difficult to obtain since the channel matrix of massive MIMO is much more complex than the traditional one. In this paper, we propose a limited feedback strategy named hybrid limited feedback with selective eigenvalue information (HLFSEI), which jointly considers...
In this paper, we examine multi-source multi-relay systems that employ Analog Network Coding for which we provide a two-fold contribution: i) We derive a closed-form upper bound of the average symbol error rate (SER) per source of the system, which is shown to be tight in the high-Signal-to-Noise Ratio (SNR) region, especially for an adequate number of relays, and ii) based on this bound, for a given...
Recently numerous sensing applications from the Internet of Things(IoT), such as traffic monitoring and noise map making, require the expensive installation cost. To handle this challenge, crowd sensing, as a new paradigm, has received extensive concerns. To achieve good service quality, incentive mechanisms are necessary to attract more users to participate in crowd sensing. However, Traditional...
In this paper, we propose a pricing framework for interference management in device-to-device (D2D) underlaying cellular networks, where the base station (BS) protects itself by pricing the cross-tier interference caused from the D2D users. A Stackelberg game is formulated to model the interactions between the BS and D2D users. Specifically, the BS sets prices to a maximize its revenue subject to...
This paper proposes a new Fault Tolerant Control Strategy relying on Fault Detection, Isolation and Reconfiguration (FDIR) algorithms. Adaptive Control laws are combined to Control Allocation algorithms that enable the reconfiguration of Flight Control Laws in case of actuators and/or Reaction Control System (RCS) failures. This allows achieving good robustness to possible failures occurring during...
This paper investigates the energy-efficient power allocation for a two-tier, underlaid femtocell network. The behaviors of the Macrocell Base Station (MBS) and the Femtocell Users (FUs) are modeled hierarchically as a Stackelberg game. The MBS guarantees its own QoS requirement by charging the FUs individually according to the cross-tier interference, and the FUs responds by controlling the local...
Energy efficiency has currently become one of the central topics in today's wireless communication industry. In this paper, we focus on the energy-efficient design in downlink multi-user MIMO-OFDM systems, so as to optimize the energy efficiency with users' quality of service (QoS) guarantees. Particularly, an optimization problem concerning power allocation is formulated, where the objective is the...
We propose a novel bargaining-game-based access network selection scheme for call requests in heterogeneous networks (HetNet). The bargaining game takes into consideration a number of factors including the mobility pattern of the mobile device, the load of the candidate access network, and the preference of the candidate access network to the call request. The studied bargaining game has a unique...
In this work we present a unified treatment on the most common metrics used in the utility function of state-of-the-art user selection algorithms for sum rate maximization in MISO systems under Zero-Forcing Beamforming. We present the way that such metrics are used to maximize the total sum rate and the relations held among each other. Via simulation we found upper bounds of the average total sum...
The fault positions method is used in this work to analyze the performance of a distribution system against voltage sags during the occurrence of different (balanced and unbalanced) short-circuit types. After the voltage sags matrix has been determined for each short circuit type, the largest vulnerability area for each bus will be considered. The approach considers all thresholds that characterize...
Most modern hypervisors offer powerful resource control primitives such as reservations, limits, and shares for individual virtual machines (VMs). These primitives provide a means to dynamic vertical scaling of VMs in order for the virtual applications to meet their respective service level objectives (SLOs). VMware DRS offers an additional resource abstraction of a resource pool (RP) as a logical...
Dynamic base station activation and transmission power control are the key mechanisms to reduce energy consumption in cellular networks. In this work, we consider employing these methods for the purpose of minimizing long-term energy cost in cellular networks. Based on the two-timescale Lyapunov optimization technique, we formulate an online control problem to ensure achieving minimal energy cost...
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