Babu Sena Paul

Time and Angle of Arrival Statistics of Mobile-to-Mobile Communication Channel Employing Circular Scattering Model

Abstract of mobile-to-mobile communication channel have been studied through a geometrical single bounce scattering model and analytical expressions for angle of arrival and time of arrival probability density functions have been derived for such models. Analytical expressions have been verified through computer simulations. This paper aims to provide a better understanding of mobile-to-mobile channel behavior in terms of the parameters studied.

User Cooperation in TDMA Wireless System

Abstract Reliability of radio link is limited, owing to path loss, shadowing and multi-path fading. This necessitates the use of a certain type of diversity. In recent years, cooperative diversity has gained considerable attention. Here, wireless nodes cooperate in such a way that they share their antennas and other resources, to create a virtual array through distributed transmission and signal processing. This increases coverage and reduces transmitted power, thereby bringing down co-channel interference, which results in increased system capacity. This paper gives an overview of the state of art of various cooperation schemes and issues related to their implementation.

Time and Angle of Arrival Statistics of Mobile-to-mobile Communication Channel Employing Dual Annular Strip Model

Abstract In this paper, a generalized channel model for mobile-to-mobile communication based on the single bounce geometry-based channel modeling techniques has been proposed and analyzed. The model assumes the scatterers to be present in annular strips around the transmitting and the receiving mobile stations. Time of arrival and angle of arrival statistics, being two important channel parameters, have been derived and verified through computer simulations.

Maximal ratio combining of two amplify-forward relay branches with individual links experiencing Nakagami fading

Relny based communication has gained considerable importance in the recent years. In this paper we find the end-to- end statistics of a two hop non-regenerative relay branch, with each hop being Nakagami-m distributed. Analytical expression for the density function of the signal envelope at the output of a maximal ratio combiner in the destination node is also derived and compared with the simulation results, assuming that the destination node receives the signal through two independent relay paths. These statistics are useful in evaluating the system performance.

Experimental evaluation of NFC reliability between an RFID tag and a smartphone

Near Field Communication (NFC) is a short range wireless technology that enables data transfer between two NFC devices. It is derived from Radio Frequency Identification (RFID) technology. However, NFC only operates at 13.56MHz frequency while RFID operates at both 125KHz and 13.56MHz frequencies. The success of NFC in replacing contact cards in payment systems can be duplicated in other industries. It is very critical that the operation of NFC is well understood so that future applications can make life easier for the users. The main purpose of this paper is to find out the parameters that can affect the optimal operation of passive NFC devices.

MIMO Channel Modeling: A Review

Abstract Channel modeling plays an important role in understanding the behavior and designing of communication systems for different environments. In this paper, we make a brief review of the different channel modeling techniques used to model a multiple-input-multiple-output (MIMO) wireless channel.

A foliage scatter model to determine topology of wireless sensor network

Applications of low cost wireless sensor networks (WSN) in precision agriculture is gaining popularity because of the ability of sensors to provide site-specific data over a variable field. Wireless communication between nodes is impeded by the surrounding vegetation of the plants being monitored. To guarantee reliable communication between sensor nodes, the initial node density and topology of a WSN application has to consider the increased foliage of a mature plant. In this paper we propose a model for deployment of wireless nodes based on experimental results that takes into account the scattering effect of surrounding foliage on the wireless signal.

Smart homes : energy efficiency based on demand side management and game theoretic algorithm

The smart home is an integral part of future energy management and control. The reduction of domestic energy consumption and improved energy efficiency of households will require intelligent systems that constantly monitor the household electricity usage and provides realtime updates to the user. This will lead to a bill reduction for households and energy efficiency. In this paper we investigate two concepts, namely; (i) the effect of a demand side management system, where a smart meter prototype was provided to each household depicting detailed and real-time information to the user, and (ii) a Game theoretic algorithm to manage and minimize the daily electricity expenditure and improve the energy efficiency of the domestic household. Computational results and data are provided and discussed that determine which system would work the best.

EMTP-based analysis of pre-insertion resistor and point on wave switching methodology

The switching of high-voltage capacitor banks for reactive power and voltage control usually generates significant transients. These high amplitude disturbances have a tendency to damage or reduce the lifespan of capacitor units, thus leading to complete failure of capacitor banks. Pre-insertion resistors or inductors as well as synchronous switching (Point on Wave) methods can be used to mitigate transient phenomenon. In this work, Electromagnetic Transient Program simulations of transient voltage for single and back to back capacitor banks indicate that pre-insertion resistors methodology can significantly reduce transients, and could therefore be combined with synchronous switching to effect transient mitigation.

Selection combining of two amplify-forward relay branches with individual links experiencing Nakagami fading

Relay based communication has gained considerable importance in the recent years. In this paper we find out the end- to-end statistics of a two hop non-regenerative relay branch, with each hop being Nakagami-m distributed. A closed form expression for the statistics of the signal envelope at the output of a selection combiner in the destination node is also derived and compared with the simulation results. These statistics are useful in understanding the system performance in terms of bit error rate and outage probability.