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)
BACKGROUND Although moderate alcohol consumption has been shown to confer a protective effect for specific diseases, current societal patterns of alcohol use impose a huge health and economic burden on modern society. This study presents a method for estimating the health and economic burden of alcohol consumption to the UK National Health Service (NHS). (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)
OBJECTIVE To determine the trends in overweight and obesity among White and South Asian children aged 5-7 years born between 1991 and 1999 and included in the East Berkshire Child Health System. METHODS Children were grouped into nine cohorts based on their year of birth. The UK National BMI percentile classification was used to classify the children as(More)
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 carried out worldwide, a significant effort is being put forth by the research and standardization communities on the development and specification of LTE-Advanced. The work(More)
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 cellular systems. In this new paradigm, the deployment of hybrid access small cells can be seen as an optimal solution since they serve both the registered indoor users(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)
To improve uptake of childhood immunizations in Wandsworth we developed a standardized call/recall system based on parents being sent three reminders and defaulters being referred to a Health Visitor. Thirty-two out of 44 primary care practices in the area implemented the intervention in September 2011. The aim of this study was to evaluate the(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)
Today’s society is driven by ever-growing information needs, which cause increased demand for ubiquitous and very high speedwireless communications. In search for the urgent need of improved coverage and capacity, cellular networks are currently undergoing amajor transformation from an architecture comprised of thoroughly planned macrocell base stations(More)