Muhammad Sajjadur Rahim

University of Rajshahi | RU · Department of Information and Communication Engineering

Energy consumption is a significant issue for data forwarding in Delay-Tolerant Network (DTN), where nodes are energy-constrained as they are driven by batteries. During their limited lifetime, these nodes have to spend a huge amount of energy since they perform forwarding, receiving, and temporarily storing messages, searching for the neighboring...

In Delay-Tolerant Network (DTN), nodes’ energy consumption depends highly on their movement pattern since energy-constrained nodes move in a “Store-Carry-and-Forward” paradigm for data communication. Energy must be expensed efficiently, selecting a suitable mobility model for successfully delivering messages in DTN. Mobility models are generally tw...

The mobility patterns of nodes significantly influence the performance of delay-tolerant network (DTN) routing protocols. Trace-based mobility is a class representing such movement patterns of nodes in DTN. This research analyzes the performance of DTN routing techniques on trace-based mobility regarding delivery ratio, average latency, and overhea...

There is currently little evidence linking COVID-19 to Alzheimer’s Disease (AD). The goal of this paper is to examine the correlation among COVID-19 symptoms to identify risks for AD patients and to determine the conditions that put AD patients in danger. We have developed a Machine Learning (ML) based model called AD-Cov-CorrelationNet that shows...

Handheld devices have recently become an indispensable part of our daily lives. These devices always require an end-to-end connection for proper message transmission. Message transmission will be halted if the connection fails. In this case, delay-tolerant networks (DTNs) are preferable. One of the most important applications of DTN is the transmis...

Delay-Tolerant Networks (DTNs) enable communication in challenging environments where intermittent connectivity is the norm. However, the presence of selfish nodes, which prioritize their own interests over network performance, can significantly degrade the performance. This paper investigates the impact of selfish nodes on three prominent DTN rout...

Energy consumption is a significant issue for data forwarding in Delay-Tolerant Network (DTN), where nodes are energy-constrained as they are driven by batteries. During their limited lifetime, these nodes have to spend a huge amount of energy since they perform forwarding, receiving, and temporarily storing messages, searching for the neighboring...

Delay-Tolerant Network (DTN) is a resource-bound networking system which consists of many intermittently connected, movable devices known as nodes. Energy can be considered as an important resource for DTN scenarios since these nodes have limited energy. In order to perfect network enforcement, it is necessary to exploit the energy of the nodes eff...

Delay-Tolerant Network (DTN) is a resource-bound networking system which consists of many intermittently connected, movable devices known as nodes. Energy can be considered as an important resource for DTN scenarios since these nodes have limited energy. In order to perfect network enforcement, it is necessary to exploit the energy of the nodes eff...

Intermittently connected mobile networks are sparsely connected wireless ad-hoc networks where there is no end-to-end path from a source device to a destination. Generally, these paths do not exist. Hence, these devices use intermittent paths using the concept of store-and-forward mechanism to successfully accomplish the communication. These networ...

Our goal is to evaluate the performance of DTN routing techniques for emergency message circulation in the campus area of Rajshahi University in case of disaster when regular communication networks are not available.

Delay-Tolerant Network (DTN) is such a kind of network that cannot possibly maintain continuous connections among source and destination nodes all the while and exploits mobility of nodes for message propagation. DTN uses store-carry-forward approach where message travels from source to destination node through intermediate nodes by opportunistic c...

In opportunistic environments data forwarding is challenging where connectivity is intermittent because of network partitioning, dynamic topologies and long delays. Traditional routing protocols of Delay Tolerant Network (DTN) exploit "Store-Carry-and-Forward" strategy in these cases. But the pitfall of this approach is the selection of perfect rel...

In orthogonal frequency division multiplexing (OFDM) system, high value of peak-to-average power ratio (PAPR) is an operational problem that may cause non-linear distortion resulting in high bit error rate. Selected mapping (SLM) is a well known technique that shows good PAPR reduction capability but inflicts added computational overhead. In this p...

High Peak to Average Power Ratio (PAPR) is one of the major drawbacks for Orthogonal Frequency Division Multiplexing (OFDM) transmitted signal. Among the PAPR reduction techniques, Selected Mapping (SLM) technique is one of the promising one but results in added computational complexity. In this paper, we applied Greatest Common Divisor (GCD) seque...

In Delay-Tolerant Network (DTN), there exists a lack of direct path from source to destination, and it is also featured by extremely high bit error rate, unwanted delay, limited resource, etc. For such network, we have investigated the effects of buffer size and mobility models on the optimization of the number of message copies for multi-copy rout...

In Orthogonal Frequency Division Multiplexing (OFDM) system, high value of Peak-to-Average Power Ratio (PAPR) is an operational problem that may cause non-linear distortion resulting in high Bit Error Rate (BER). Selected Mapping (SLM) is a well known PAPR reduction technique that shows good performance but inflicts added computational overhead. In...

Delay-Tolerant Networks (DTNs) are such kind of networks, where there is no direct path from source to destination. Such networks are characterized by long/variable delays, asymmetric data rates, limited resources and high error rates. In such network, when the number of nodes increases but memory in buffer is fixed for each node, then there is a n...

Delay-Tolerant Networks (DTNs) are sparse dynamic wireless networks, where most of the time a complete end-to-end path from the source to the destination does not exist. There are many real networks that follow this model, for example, military networks, vehicular ad-hoc networks (VANETs), wildlife tracking sensor networks, etc. In this context, co...

Delay-Tolerant Networks are used to enable communication in challenging environments where nodes are intermittently connected, and an end-to-end path does not exist all the time between source and destination, e.g., Intermittently Connected Mobile Networks (ICMNs). Therefore, network environments, where the nodes are characterized by opportunistic...

High Peak-to-Average Power Ratio (PAPR) is one of the main drawbacks that may limit practical applications of Orthogonal Frequency Division Multiplexing (OFDM) system. Based on the well known Selective Mapping (SLM) method of PAPR reduction, in this paper, we propose a new phase sequence generation technique from Condex matrix that can achieve bett...

Intermittently Connected Mobile Networks (ICMNs) are sparse wireless networks where most of the time an end-to-end path does not exist from source to destination. These networks are characterized by opportunistic connectivity, long and variable delay, asymmetric data rate and high error rate. Hence, they can be appropriately modeled as Delay-Tolera...

Reduction of high Peak-to-Average Power Ratio (PAPR) is a very important issue in Orthogonal Frequency Division Multiplexing (OFDM) system. In this contribution, we propose a new phase sequence that can be used in Selective Mapping (SLM) technique; a well known PAPR reduction method. Generated from Greatest Common Divisor (GCD) matrix, we show that...

During my (Md. Sharif Hossen) thesis study, we present our works at the Seminar on 3D Printing Technology organized by Department of Information and Communication Engineering (ICE), University of Rajshahi (RU).

Delay-Tolerant Networks are used to enable communication in challenging environments where nodes are intermittently connected and an end-to-end path does not exist all the time between source and destination, e.g., Intermittently Connected Mobile Networks (ICMNs). Therefore, network environments where the nodes are characterized by opportunistic co...

Underwater acoustic channel has extensive and varying propagation delay, high bit error rate and inadequacy of bandwidth. One of the major applications of underwater networks is environmental monitoring and surveillance. To accomplish this task, underwater mobile networks are comprised of Autonomous Underwater Vehicles (AUVs) which roam around the...

A new two layer hierarchical routing protocol called Cluster Based Hierarchical Routing Protocol (CBHRP) is proposed in this paper. It is an extension of LEACH routing protocol. We introduce cluster head-set idea for cluster-based routing where several clusters are formed with the deployed sensors to collect information from target field. On rotati...

The underwater acoustic channel features long and variable propagation delay, high bit error rate and limited bandwidth. Moreover, underwater mobile networks consisting of Autonomous Underwater Vehicles (AUVs) for surveillance and monitoring applications often suffer from intermittent connectivity as nodes move around the area of operations. Theref...

An ad-hoc network is an aggregation of wireless nodes forming a provisional network without anyestablished infrastructure. To facilitate communication within such network, a routing protocol is used todiscover and setup routes between nodes. The goal of the routing protocol is to have an efficient routeestablishment between a pair of nodes, so that...

The efficient use of energy source in a sensor node is most desirable criteria for prolong the life time of wireless sensor network. In this paper, we propose a two layer hierarchical routing protocol called Cluster Based Hierarchical Routing Protocol (CBHRP). We introduce a new concept called head-set, consists of one active cluster head and some...

Wireless sensor network with a large number of small sensor nodes can be used as an effective tool for gathering data in various situations. Energy is a critical resource in wireless sensor networks, and system lifetime needs to be prolonged through the use of energy-aware strategies during system operation. Routing in wireless sensor networks (WSN...

Wireless sensor networks (WSNs) consist of small nodes with sensing, computation and communications capabilities. Recent advances in wireless sensor networks have led to many new routing protocols specifically designed for sensor networks where energy awareness is an essential design issue. Most of the attention has been given to the routing protoc...

Wireless Sensor Networks (WSNs) naturally apply to a broad range of applications that involve system monitoring and information tracking. However, the applications for wireless sensor networks have notably different characteristics and requirements from standard wireless local area network (WLAN) applications. Low energy consumption is the most imp...

In a Mobile Ad hoc Network (MANET), mobile nodes move around arbitrarily; nodes may join and leave at any time, and the resulting topology is constantly changing. Routing in MANET is challenging because of the dynamic topology and the lack of an existing fixed infrastructure. Due to the limitations in the wireless environment, it may be necessary f...

Wireless sensor networking, an emerging field in communication technology, now opens a variety of application scenarios including remote surveillance, military or home security, disaster warning and so on. Energy is a critical resource in wireless sensor networks and system lifetime needs to be prolonged through the use of energy-aware strategies d...

Impedance and radiation characteristics of offset-fed slot antenna have been investigated for the reception of digital terrestrial TV broadcasting at 600 MHz including the effects of human hands and LCD (Liquid Crystal Display) panel. First, the impedance characteristics of center-fed slot antenna have been obtained using Finite Difference Time Dom...

Impedance and radiation characteristics of offset-fed slot antenna have been investigated for the reception of digital terrestrial TV broadcasting at 600 MHz including the effects of human hands and LCD (liquid crystal display) panel. First, the impedance characteristics of center-fed slot antenna have been obtained using finite difference time dom...

Impedance and radiation characteristics of offset-fed slot antenna have been investigated for the reception of digital terrestrial TV broadcasting at 600 MHz including the effects of human hands. The proposed antenna is suitable for embedding at the back of notebook computers' display. First, the impedance characteristics of center-fed slot antenna...

Impedance and radiation characteristics of offset-fed slot antenna have been investigated for the reception of digital terrestrial TV broadcasting at 600 MHz including the effects of human hands. The proposed antenna is suitable for embedding at the back of notebook computers' display. First, the impedance characteristics of center-fed slot antenna...