Ravikumar Balakrishnan

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Spectrum sensing is a key function of cognitive radio to prevent the harmful interference with licensed users and identify the available spectrum for improving the spectrum's utilization. However, detection performance in practice is often compromised with multipath fading, shadowing and receiver uncertainty issues. To mitigate the impact of these issues,(More)
Available online xxxx Keywords: Carrier aggregation Enhanced MIMO CoMP Relays Heterogeneous networks Machine-type communications Device-to-device communications a b s t r a c t Cellular networks have been undergoing an extraordinarily fast evolution in the past years. With commercial deployments of Release 8 (Rel-8) Long Term Evolution (LTE) already being(More)
BACKGROUND Gram-negative Enterobacteriaceae with resistance to carbapenem conferred by New Delhi metallo-beta-lactamase 1 (NDM-1) are potentially a major global health problem. We investigated the prevalence of NDM-1, in multidrug-resistant Enterobacteriaceae in India, Pakistan, and the UK. METHODS Enterobacteriaceae isolates were studied from two major(More)
Relay is one of the key features being considered for IMT-Advanced systems. The relay architectures defined in IEEE 802.16m and 3GPP LTE-Advanced are optimized only for non-mobile relay, i.e., the Relay Station is attached to a designated Base Station and becomes a part of the fixed access network. A mobile relay architecture, where relay may switch(More)
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract—The recent problems in wireless cellular networks such as network capacity and indoor coverage have been addressed by the OFDMA small cells deployments of the Next-Generation LTE Advanced(More)
Today's society is driven by ever-growing information needs, which cause increased demand for ubiquitous and very high speed wireless communications. In search for the urgent need of improved coverage and capacity, cellular networks are currently undergoing a major transformation from an architecture comprised of thoroughly planned macrocell base stations(More)
—Small cells are redefining the traditional cellular system concepts. Coordination among small cells offers several benefits in terms of utilizing existing network infrastructure to support advanced interference management, mobility management as well as self-organizing (SON) functions. In this work, the problem of handover management is studied. The(More)
—Smallcell technology is gaining significance as part of the next-generation cellular systems due to their performance benefits in terms of increased network capacity and improved indoor and local coverage. Hybrid access smallcells, which provide service to both indoor as well as neighboring users, adopt adhoc policies to guarantee performance benefits to(More)
Cellular systems are rapidly evolving from a homogeneous macrocell deployment to a heterogeneous deployment of macrocells overlaid with many small cells. The striking features of small cells include small coverage area, ad-hoc deployment, and flexible backhaul connectivity. These features call for a profound rethinking of traditional cellular concepts(More)
In this paper, the energy efficiency of cooperative sensing in cognitive radio networks is investigated. In cooperative sensing, more energy is consumed in sensing the channel and reporting the results to the fusion detector. To address this issue a very innovative design called External Sensing Energy Efficient technique is proposed in this literature.(More)
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