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Tracking the maximum power point (MPP) of a photovoltaic array is an essential part of a photovoltaic (PV) system. PV system performance average losses are of about 20%-25% in electricity production. The causes are mismatching losses, partial shadows, variations in current - voltage characteristics of PV modules due to manufacturing processes, differences in the orientations and inclinations of solar...
Routing in WSNs (Wireless Sensor Networks) is very challenging due to some special characteristics that differentiate these networks from other wireless networks like cellular networks, mobile ad-hoc network etc. The difference is due to scalability, careful resource management etc. Sensor nodes are generally battery powered, are expected to be remotely deployed, and operated autonomously in unattended...
Recent advancements in wireless communications and electronics have enabled the development of low cost sensor networks. The sensor networks can be used in various applications such as military, health, home. Depending on the application researches are resolving different technical issues. In some applications, a certain segment of the network becomes energy constrained before the remaining network...
Data aggregation is a technique used to conserve battery power in wireless sensor networks (WSN). When securing such a network, it is important that we minimize the number of computationally expensive security operations without compromising on the security. This paper deals with the test-bed implementation of our end to end secure data aggregation algorithm. Unlike previous algorithms which required...
To support high scalability and better data aggregation, sensor nodes are often grouped in to disjoint and mostly non overlapping sub sets called clusters. Clusters create hierarchical WSNs which facilitate efficient utilization of limited resources of sensor nodes and thus extends network lifetime. ZigBee, a communication standard for LR-WPAN (Low Rate Personal Area Networks), has low power consumption,...
This paper develops algorithms to ensure that agents of a mobile micro autonomous system (MMAS) maintain integrity of communication flows as they move to accomplish their task. Due to inherent uncertainties in estimation of wireless channels, we advocate a stochastic approach whereby achievable communication rates of point-to-point links are regarded as random variables with known means and variances...
Secure data transmission and data routing are critical in designing cluster based sensor network. This paper presents a secure energy efficient dynamic routing scheme (SEEDR) for wireless sensor networks. SEEDR uses a symmetric cryptography algorithm to support security. The dynamic key exchange protocol based on DH (Diffie-Hellman) algorithm is proposed, with non blocking OVSF codes. Our analytical...
In this paper, a brief description of a low cost wireless sensor network (WSN) node, which is designed using ultra low power based MSP430 and Nordic nRF24L01, has been given. This network works at 2.4 GHz frequency in ISM band. We have also described a biomedical wireless sensor network (BWSN) comprising of ECG (electrocardiogram) sensor that communicates wirelessly through the smart wireless modules...
Networked robots represent the convergence of robotics, sensor networks and mobile ad-hoc networks, with many applications and a growing market projected to be $200B in 2013. This talk will focus on some fundamental problems and practical issues underlying the deployment of large numbers of autonomously functioning robots. The central problem is the so-called inverse problem of deriving individual...
Sensor network is receiving considerable attention as one of the key technologies to keep track of the parameters in the industrial field. Wireless sensor networks (WSN) integrate sensor technology, embedded technology, distributed information processing and network communication. The nodes of WSN serve the functions of perceiving and routing. Power consumption is the key factor affecting the longevity...
We study the problem of total throughput maximization in arbitrary multi-hop wireless networks, with constraints on the total power usage (denoted by PETM), when nodes have the capability to adaptively choose their power levels, which is the case with software defined radio devices. The underlying interference graph changes when power levels change, making PETM a complex cross-layer optimization problem...
Key management is a decisive part for security in wireless sensor networks. Pre-distribution of secret keys for all pairs of nodes is not viable due to the large amount of memory used when the number of sensor node is huge. Recently, a random key pre-distribution scheme is proposed as an efficient solution for sharing keys among sensor nodes to reduce the length of shared key and avoid unnecessary...
Secure communications among large numbers of wireless sensor nodes that are randomly scattered in an environment is necessary to avoid unauthorized access to data. Secure communication among sensor nodes requires pairwise key distribution prior to the actual data transmission. In this work, we consider pairwise key generation and distribution problem in wireless sensor networks where large amount...
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