National Institute of Technology, Meghalaya

About: National Institute of Technology, Meghalaya is a education organization based out in Shillong, India. It is known for research contribution in the topics: Control theory & Computer science. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

Implementation of OFDM and Pulsed-OFDM

Abstract: This work undertaken, aims to develop pulsed-OFD transmission system, which is used in wide area of wireless communications. It is noteworthy to mention that the system is baseband transmission by excluding the RF (radio frequency) part. Pulsed-OFDM enhances the OFDM that endeavors prominent performance parameters with lesser complexity in implementation. This is possible by pulsating the OFDM symbols and spreading the frequency spectrum of the modulated signals. In this paper the implementation of the pulsed-OFDM transmission, as well as comparison results with OFDM have been presented. Focus is on the architectural characteristics of the system blocks which are used for transmission and reception. In this paper up-sampling is applied to the OFDM signal to induce the pulsed-OFDM signal. Finally, the performance of the system has been analyzed.

An idea of implementing CMOS operational amplifier in summer configuration for the designing of highly sensitive pressure transducer

Abstract: This work presents the designing and simulation of a piezoresistive pressure transducer using an operational amplifier (op-amp) in summer configuration for higher pressure sensitivity. Piezoresistors placed on high-stress regions of the square silicon diaphragm are used as the sensing elements that detect the variation in the resistance of piezoresistors under an applied pressure range of 0-1 MPa in a step size of 100 KPa. An operational amplifier circuit has been designed using five micron CMOS technology parameters in T-Spice simulation tool. A non-inverting op-amp in summer configuration has been used as the readout circuit of the pressure transducer which converts the resistance variation of piezoresistors into output voltage. The Intellisuite software has been used to simulate the analytical model which describes the complete behavior of the pressure transducer employing both p-type and n-type piezoresistors as the sensing elements. Simulation result clearly shows that the op-amp in summer configuration based pressure transducer using p-type and n-type piezoresistors have a sensitivity of 187 mV/MPa and 1047 mV/MPa, respectively.

A group-based authentication scheme for vehicular Moving Networks

Abstract: Uninterrupted mobile connectivity in fast moving public transportation systems like bus and train is difficult to achieve. Frequent handovers and security procedures for a large number of mobile users travelling together in these mass transportation systems can cause disruption in connectivity and signaling overload on the network. A possible solution to this problem is to group together all co-located users and perform a single authentication/handover procedure for the entire group. In this paper, the authors propose a lightweight, multi-layered, group based authentication protocol for a group of mobile users travelling in public transportation systems.

Fast In-Memory Computation of Boolean Functions in Memristive Crossbar Array

Abstract: Modern computing paradigms like in-memory computing have increasingly become popular among emerging non-volatile memories such as memristor. In this paper, a synthesis approach using the MAGIC design style has been proposed to map two-level Boolean functions in memristive crossbar array. The proposed synthesis approach exploits parallelism offered by the crossbar array to reduce latency. Our evaluation shows that though this approach consumes more area; however, the delay is reduced to a great extent. The method results in a design that is faster as compared to existing stateful logic designs as demonstrated for an N-bit adder. SPICE simulation has been performed to estimate delay and energy requirements. Results have been compared with some recent works on MCNC benchmark functions.