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In this survey article, we consider the wireless multi-way relaying scenario, in which there is no direct link connecting the nodes and multiple nodes exchange information with the help of a relay node. In a multi-way relaying scenario, if several nodes transmit simultaneously, due to the superposition nature of the wireless channel, multiple access interference results at the relay node, which can...
We propose a new characterization of inner and outer bounds of some network information theoretic regions in terms of upper concave envelopes of certain functions of mutual information. While this characterization is related to the characterization using auxiliary random variables, it is shown that the new characterization can make computations of boundary points much simpler. Further this representation...
Femtocells are an emerging technology aimed at providing gains to both network operators and end-users. These gains come at a cost of increased interference, specifically the cross network interference between the macrocell and femtocell networks. This interference is one of the main performance limiting factors in allowing an underlaid femtocell network to share the spectrum with the cellular network...
We consider the problem of estimating functions of distributed data using a distributed algorithm over a network. The extant literature on computing functions in distributed networks such as wired and wireless sensor networks and peer-to-peer networks deals with computing linear functions of the distributed data when the alphabet size of the data values is small, O(1). We describe a distributed randomized...
Achievable rate regions and outer bounds are derived for three-user interference channels where the transmitters cooperate in a unidirectional manner via a noncausal message-sharing mechanism. The three-user channel facilitates different ways of message-sharing between the primary and secondary (or cognitive) transmitters. Three natural extensions of unidirectional message-sharing from two users to...
In this paper, we study the capacity of a multihop relay network with decode-and-forward strategy at each of the relay nodes. We consider both transmission power and processing power consumption at each link and a total network power constraint. We characterize the optimal number of hops that achieves maximum end-to-end throughput. In one special case, we derive an analytical expression for this optimal...
In this paper, we obtain the capacity region for the AWGN Multiple Access Channel (MAC) with transmitters equipped with energy harvesters. We then develop low delay, adaptive transmission strategies that surprisingly achieve near optimal performance under finite battery resource constrained settings for the flat fading MAC. We describe the rate-fairness tradeoff inherent to the MAC and adapt the well...
Automated driving is getting a step closer to reality. However, systematic methods for analyzing the safety benefits of deploying automated vehicles on roads are lacking. In this paper, we provide an outline of a methodology that may be adopted to assess the safety benefits of automatic vehicle following in an emergency braking scenario. Automated vehicles travel in a single straight lane and the...
Macroscopic traffic flow models are suited for large scale, network wide applications where the macro-characteristics of the flow are of prime interest. A clear understanding of the existing macro-level traffic flow models will help in modelling of varying traffic scenarios more accurately. Existing state-of-the-art reports on traffic flow models have not considered macro-level models exclusively...
This paper provides an extensive review of the literature on spatial transferability of travel forecasting models. From the review, a synthesis is prepared on: (1) the theoretical and practical considerations related to model transferability, (2) the approaches and metrics used to assess model transferability, (3) the methods used to transfer models, and (4) the empirical evidence on model transferability...
This study investigates some of the key determinants of vehicle ownership (number of two-wheelers and cars) and the trip frequency at the household level using data from Chennai city, India. Potential endogeneity between the number of vehicles present in a household and trip frequency is tested systematically. Vehicle ownership is represented in two ways: (1) The total number of vehicles in a household...
Expressways in India are vastly different from other roads of the country based on roadway and traffic conditions and additionally, there is no perfect strict lane discipline. Nevertheless, there is not much research literature available specific to these categories of roads in India. The knowledge of roadway capacity is an important basic input required for planning, design, analysis and operation...
This research mathematically investigates revenue neutral tradable credit schemes that can redistribute the link flow patterns to obtain least emissions for the network. The trade-off between travel time and emissions is accommodated through Pareto optimal solutions from a bi-objective problem. Further, tradable credit schemes with minimum transaction are also proposed. Numerical examples show how...
This paper proposes a system for on-board monitoring the loss of attention of an automotive driver, based on PERcentage of eye CLOSure (PERCLOS). This system has been developed considering the practical on-board constraints such as illumination variation, poor illumination conditions, free movement of driver’s face, limitations in algorithms etc. A novel framework for PERCLOS computation is reported...
A series of Al exchanged heteropoly tungstate (AlTPA) supported on SnO2 catalysts were prepared and characterized by FT-Infrared, X-ray diffraction and temperature programmed desorption of ammonia. The catalysts were evaluated for dehydration of fructose to 5-hydroxymethylfurfural (5-HMF). The catalysts showed high activity for dehydration of fructose and the catalyst with 20 % AlTPA on SnO2 exhibited...
The present investigation deals with the catalytic potential of Al-promoted vanadium phosphate (Al-VPO) materials, where in it has been found that Al-VPO has unique bifunctional properties towards versatile organic reactions such as oxidation of methanol and esterification. Besides the industrial application of VPO towards n-butane oxidation to maleic anhydride, the vanadium phosphate material showed...
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