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Systems with multiple channels and multiple radios per node have been shown to enhance throughput of wireless mesh networks (WMNs). Recently, network coding has also been proved to be a promising technique for improving network throughput of WMNs. However, the performance of network coding in the context of multicast in multi-channel multi-radio (MCMR) WMNs is still unknown. In this paper, we present...
Layered streaming in peer-to-peer (P2P) networks has drawn great interests since not only it can accommodate a large number of users but also it handles heterogeneities of peers. However, there's still a lack of comprehensive study on smoothing and layer selection for layered streaming. In this work, we aim to smooth the layered stream by selecting the appropriate layers and reducing the amplitude...
We present a unified analytical framework to jointly examine spatial, spectral, and multiuser diversity in a general multiuser MIMO OFDMA system. Spectral diversity originates from frequency domain opportunistic scheduling enabled by the OFDMA technique, and is influenced by partial feedback design. We propose a heterogeneous partial feedback design method which adapts users' feedback resources to...
Recently, the ideas of wireless network coding (NC) has significantly enriched the area of wireless cooperation/relaying. They bring substantial gains in spectral efficiency mainly in scenarios with two-way relaying. Inspired by the ideas of wireless NC, recently we have proposed techniques for coordinated direct/relay (CDR) transmissions. Leveraging on the fact that the interference can be subsequently...
A major challenge in the two-tier femtocell networks-comprised of a central macrocell underlaid with femtocells is the efficient use of radio resources. Power optimization technique is one important component of radio resource management, since the deployment of femtocells may cause serious cross-tier interference and consume large amounts of energy. This paper presents an energy-efficient power control...
The capacity of flat Rayleigh fading channels with full channel state information (CSI) at the transmitter and at the receiver at asymptotically low SNR has been recently shown to scale essentially as SNR log (1/SNR). In this paper, we investigate the Rician fading channel capacity with full CSI, and show that the capacity of this channel scales essentially as 1/1+K SNR log (1 /SNR), where K is the...
A large number of sensors, meters and intelligent electronic devices (IEDs) with the capabilities of sensing, actuation, computation and communication will be deployed in future smart power grids for the purpose of measurement, monitoring, protection, diagnosis, control, optimization and other transactions. The conventional centralized and hierarchical multi-level state estimation is not scalable...
A variational-distance-based scheme is proposed for the modulation classification problem. It decides on the modulation that minimizes the variational distance between the theoretical and empirical probability density of the received signal. Simulation suggests that it outperforms some existing featured-based classifiers, namely the cumulant classifier, K-S classifier and Kuiper classifier. Its computational...
Multi-failure network survivability is a key concern for operators owing to the recent spate of natural and man-made disasters. Hence this paper presents a new diverse lightpath protection scheme for random correlated failure recovery in multi-domain optical networks. The solution leverages topology abstraction and hierarchical inter-domain routing and assumes a-priori link failure probability state...
The idea of cognitive radio (CR) has embodied concretely in hierarchical cellular systems by deploying an underlying microcellular system to reuse the underutilized spectrum licensed by an macrocellular system. The fundamental challenges for successfully realizing such hierarchical systems are to manage the intercell interference between the macrocell and microcell and to pursue the goal of maximizing...
IP fast reroute (IPFRR) mechanisms are efficient in providing protection against link or router failure by invoking locally determined backup paths. But in the presence of a transient network failure, the path oscillates between backup and original paths, causing frequent packet out-of-order arrivals at a TCP receiver. Duplicate acknowledgments (DUP_ACKs) generated by the receiver will then trigger...
In this paper, we propose a cross-layer design to meet the QoS requirements for smart grids employing the cognitive radio sensor networks for their control and monitoring operations. Existing routing protocols pertaining to QoS support are not able to simultaneously handle traffic of different characteristics present in smart grids. Therefore, considering the traffic heterogeneity of smart grid applications...
In this paper, we consider the problem of designing transmit and receive matrices in the constant MIMO interference channel. We propose a distributed interference alignment algorithm that aims at ensuring a minimum target signal to interference plus noise ratio at each stream of all the links in the system. Based on duality properties between the uplink and the downlink of the system, we proved the...
In this paper, we consider the problem of optimum rate adaptation and power allocation to maximize the delay-limited throughput (DLT) in a time-correlated 2×1 MISO Rayleigh fading channel with Hybrid ARQ in Chase-Combining mode (HARQ-CC). To this aim, we have first formulated the DLT equation based on the outage probability for 2×1 MISO-HARQ channel. We show that exact analytical calculation of the...
This paper studies universal cheat-proof pricing by a repeated game for the general multiple access channel (MAC) without successive interference cancelation (SIC). We model the system by three entities: regulator, system optimizer and users. The regulator is designed to ensure the signal-to-interference plus noise ratio (SINR) based quality-of-service (QoS) requirements of all users and prevent cheating...
In this paper we investigate a number of network virtualization models for OpenFlow networks. Specifically, we investigate three sub-modules of the system — the control channel and the software and hardware parts of an OpenFlow switch. We propose a number of extensions to the OpenFlow specification for this purpose and present a model of a full solution that compared to existing systems provides stricter...
This paper investigates the distributed space-time (ST) coding proposals for the future Digital Video Broadcasting-Next Generation Handheld (DVB-NGH) standard. We first theoretically show that the distributed MIMO scheme is the best broadcasting scenario in terms of channel capacity. Consequently we evaluate the performance of several ST coding proposals for DVB-NGH with practical system specifications...
Intrusion detection is one of many typical applications for wireless sensor networks (WSNs). A WSN for intrusion detection application is capable of detecting any physical existence of external intruder invading an area under protection and alert the system for appropriate actions. Traditional deployment schemes for intrusion detection usually consider detection probability of having separate facilities...
Aiming at solving the problem of frequency scarcity in dense IEEE 802.11 wireless local area networks (WLANs), a novel channel assignment scheme is proposed in this paper where we explore the partially overlapped channels for additional frequency resources. In our proposed algorithm, we first introduce a user number estimation algorithm at physical layer where the number of users is determined by...
Self-management will be a distinctive feature in future mobile network infrastructures. Decision points and control loops in the network depend on having the right information at the right place at the right time. For this task we present an Information Gathering and Processing System (IGPS) and show how meta-information (e.g. information costs) can be exploited as an organizing principle in the involved...
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