Nityananda Sarma

Nityananda Sarma
Tezpur University · Department of Computer Science & Engineering

B.E., M.Tech, PhD

About

104
Publications
22,072
Reads
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1,495
Citations
Citations since 2016
48 Research Items
1134 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction

Publications

Publications (104)
Article
Cognitive radio (CR) is a novel intelligent technology which enables opportunistic access to temporarily unused licensed frequency bands. A key functionality of CR is to distribute free channels efficiently amongst Secondary Users (SUs) boosting spectrum usage to assist the escalating wireless applications world wide. In this context, this paper in...
Article
Full-text available
Owing to the spectrum scarcity and energy constrained devices in wireless networks arises the demand for an efficient spectrum sensing technique which improves both sensing performance and energy efficiency for cognitive radio networks. This paper proposes a cooperative spectrum sensing scheduling (CSSS) scheme for heterogeneous multi-channel cogni...
Article
Full-text available
Cognitive Radio (CR) is an advanced technology, which intends to boost the radio spectrum utilization. On perceiving the spectrum holes, next there is a need to provide a fair distribution of the vacant licensed channels amongst Secondary Users (SUs) during the spectrum allocation process. In this context, our paper introduces two allocation models...
Article
Full-text available
Opportunistic availability of licensed frequency bands enables the secondary users (SUs) to avail the radio spectrum dynamically. Cognitive radio (CR) paradigm extends the dynamic spectrum access techniques to sense for free channels (called spectrum holes) which can be efficiently redistributed amongst SUs. Motivated by the adaptive technology in...
Article
Full-text available
Cognitive radio (CR) has evolved as a novel technology for overcoming the spectrum-scarcity problem in wireless communication networks. With its opportunistic behaviour for improving the spectrum-usage efficiency, CR enables the desired secondary users (SUs) to dynamically utilize the idle spectrum owned by primary users. On sensing the spectrum to...
Article
Full-text available
Spectrum prediction based sensing schemes minimize the overall energy consumption of the sensing module in cognitive radio networks (CRNs) by predicting the status of spectrum before performing actual physical sensing. But, the performance of independent or local prediction models suffer from inaccuracies. Cooperative mode of spectrum prediction is...
Article
Full-text available
To design an energy efficient Medium Access Control (MAC) protocol for the Underwater Wireless Sensor Networks (UWSNs) is an urgent research issue since depleted batteries cannot be recharged or replaced in the underwater environment. Moreover, the underwater acoustic channels are affected by hindrances such as long propagation delay and limited ba...
Article
Full-text available
Recent advancement in hardware and the availability of bandwidth open scope for multichannel communication in underwater wireless sensor networks (UWSNs). Utilizing multiple channels for data and control packets in bursty traffic networks can reduces collisions due to several contending nodes. The paper presents a synchronous reservation based Mult...
Article
Full-text available
To design a reliable and energy efficient medium access control (MAC) protocol for underwater wireless sensor networks (UWSNs) is an active research area due to its variety of applications. There are many issues associated with underwater acoustic channels including long and variable propagation delay, attenuation, and limited bandwidth which pose...
Article
Cognitive Radio (CR) is a novel technology which empowers the unlicensed users to opportunistically avail the free channels left unoccupied by the licensed owners. This apparently resolves the spectrum scarcity problem arising in today's telecommunication industry. In this technology, once the free bands (called spectrum holes) are detected using s...
Chapter
Under-utilization of wireless spectrum by the licensed owners creates spectrum holes which can be opportunistically exploited by secondary users (SUs). By incorporating dynamic spectrum access techniques, Cognitive Radio (CR) emerges as a novel technology which facilitates redistribution of the spectrum holes dynamically. In this context, this pape...
Chapter
Fair allocation of unused licensed spectrum among preferable secondary users (SUs) is an important feature to be supported by Cognitive Radio (CR) for its successful deployment. This paper proposes an auction theoretic model for spectrum allocation by incorporating different constraints of a CR network and intents to achieve an effective utilizatio...
Chapter
Full-text available
With its opportunistic nature to exploit the unused licensed bands, cognitive radio (CR) presents itself as an advancing technology that senses for spectrum holes and distributes them rightly among secondary users. This paper proposes a spectrum assignment approach for CR networks that looks to provide a proper sharing of the available channels suc...
Conference Paper
In the field of cognitive radio network (CRN), spectrum sensing is one of the major function to detect the free spectrum band, for opportunistic use by cognitive radio (CR) users. However, major challenges arise when detection in the presence of licensed (primary) users fail due to various issues like noise uncertainty, multipath fading, shadowing,...
Article
Research on underwater wireless sensor networks (UWSNs) is an emerging area. This domain offers challenges and opportunities dynamically. Acoustic communication is one of the most mature technologies in this domain. Existing medium access control (MAC) protocol for terrestrial WSNs are not sufficient to solve the issues in UWSNs due to their limita...
Chapter
Cooperative spectrum sensing (CSS) emerges as an efficient technique for cognitive radio overcoming the issues of independent sensing. In this work, a distributed cooperative spectrum sensing scheme using non-transferable coalitional game model has been proposed for cognitive radio networks (CRNs) which contributes to improve the opportunity detect...
Chapter
Spectrum sharing is a key functionality of cognitive radio network (CRN) that features a fair distribution of vacant licensed channels among secondary users. This paper proposes a spectrum allocation scheme for CRN that takes into account different spectrum opportunities to be allocated to the secondary users while improving the spectrum utilizatio...
Article
Cooperative spectrum sensing has been proven to improve sensing performance of cognitive users in presence of spectral diversity. For multi-channel CRN (MC-CRN), designing a cooperative spectrum sensing scheme becomes quite challenging as it needs an optimal sensing scheduling scheme, which schedules cognitive users to different channels such that...
Conference Paper
Cloud storage service allows its users to store and share data in a cloud environment. To secure the data from unauthorized entities while sharing, cryptographic mechanisms are used. Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is one such mechanism, which has been widely used to achieve fine-grained access control over encrypted data. How...
Chapter
One of the challenging issues in optical networks is call blocking and it increases with the number of lightpath requests due to the limited number of wavelength channels in each fiber link. This chapter introduces a priority based routing and wavelength assignment (PRWA) scheme in order to reduce call blocking in the network. The introduced PRWA s...
Chapter
This chapter presents a comprehensive survey on various works done in the field of wavelength division multiplexing based optical networks. We start with a brief introduction of lightpath establishment in optical networks, and then move to different routing algorithms that are used for finding a end-to-end route between a source-destination pair. T...
Chapter
To enhance the channel utilization in optical networks, this chapter introduces an end-to-end traffic grooming mechanism. The end-to-end traffic grooming mechanism multiplexes the connection/bandwidth requests that having the same source-destination pair into a lightpath within the channel capacity. Simulation results indicate that the incorporatio...
Chapter
The reliability has become an important and challenging issue in practical use of optical networks. This chapter introduces a reliable fault resilience scheme to improve the network reliability. In the introduced scheme, established lightpaths are protected using the reliable shared protection tree to provide higher reliability. This protection tre...
Chapter
This chapter evaluates the performance analysis of the major conventional routing and wavelength assignment approaches in terms of blocking probability and average setup time. Simulation results indicate that the blocking performance of the first-fit wavelength assignment policy is the lowest among all the wavelength assignment policies. Adaptive r...
Chapter
The rapid growth in world-wide communications and proliferating use of Internet has significantly modified the ways of life. This revolution has led to vast growth of communication bandwidth in every year. At the same time, the quick evolution of optical communication technologies has allowed the transmission of vast quantities of information on a...
Chapter
Dispersion in optical fiber degrades the quality of signal in optical networks. Although the use of dispersion compensating fiber (DCF) reduces the effects of dispersion, it requires additional cost, and has more propagation loss compared to step-index fiber (SIF). This chapter introduces a priority based dispersion-reduced wavelength assignment (P...
Chapter
This chapter introduces the limitations of convention wavelength division multiplexing (WDM)-based optical networks, and then presents elastic optical networks for future high-speed communications. The chapter describes the architecture of the elastic optical network and its operation principle. To complete the discussion of network architecture, t...
Article
Full-text available
Cognitive Radio has been the key technology for dynamic spectrum access in wireless networks. Cognitive Radio seems to be a promising solution to the radio spectrum overcrowding problem as well. Cognitive Radio Network allows opportunistic usage of the spectrum holes by enabling the coexistence of licensed (primary) users and unlicensed (secondary)...
Article
Full-text available
Underwater wireless sensor networks (UWSNs) has gained attention to researcher due to their wide range of applications. However, due to their power constrains and limitations, an energy efficient MAC protocol is required. Existing MAC protocols for terrestrial WSNs are not sufficient to solve the issues in UWSNs. Therefore, to design a new MAC prot...
Article
Knowledge of channel usage pattern of primary users (PUs) helps in predicting future channel availability which can reduce MAC-layer sensing overhead in cognitive radio networks. In this work, two important issues of MAC-layer sensing have been investigated for underlay mode cognitive radio networks. These are - (a) estimation and modeling of licen...
Conference Paper
Spectrum sensing is a key functionality of Cognitive Radio to detect the availability of Primary User (PU) in a licensed band. However, the local sensing performance of Cognitive Radio users is adversely affected by the issues like multi-path fading, shadowing, and receiver uncertainty problem. These issues can be addressed by Cooperative Spectrum...
Conference Paper
Wireless Sensor Networks (WSNs) are deployed in different applications such as environmental monitoring, surveillance, healthcare, habitat monitoring, industrial monitoring etc. for monitoring, gathering and sending data to a control station called sink or base station. It is an emerging area of research and provision of Quality of Service (QoS) is...
Article
Full-text available
Multi-hop WiFi-based long distance (WiLD) network is considered to be a cost-effective solution for extending Internet to rural underserved areas. In such gateway-based mesh architecture, interference-free scheduling of transmission is critical in optimizing overall network performance. In this paper, we propose an efficient TDMA-based MAC protocol...
Article
Full-text available
Quality of Service (QoS) in Wireless Sensor Networks (WSNs) is a challenging area of research because of the limited availability of resources in WSNs. The resources in WSNs are processing power, memory, bandwidth, energy, communication capacity, etc. Delay is an important QoS parameter for delivery of delay sensitive data in a time constraint sens...
Chapter
Cognitive radio (CR) has emerged as a proven technique to overcome the spectrum scarcity problem in wireless communication. Data dissemination in CR networks (CRNs) is an important activity for successful deployment of CRN. In the presence of challenges like (i) opportunity detection and (ii) requirement for strict primary user (PU) protection, mod...
Conference Paper
Full-text available
With the increase in popularity of electronic voting, it has become necessary to have secure online voting mechanism. This paper presents a novel online voting scheme by using combination of biometric and password based security. The scheme uses Fuzzy Extractor to provide biometric based authentication, while secret password is used to provide pass...
Article
Full-text available
In this paper, we propose a QoS-aware dynamic bandwidth allocation scheme to mitigate congestion problem in gateway-based multi-hop WiFi-based long distance networks and thereby enhance QoS guarantees for real-time traffic. It presents a dynamic slot scheduling scheme which efficiently distributes the unused TDMA time slots among the needy nodes. T...
Conference Paper
Full-text available
Unpredictable channel availability in cognitive radio networks (CRNs) account for routing becoming a challenging issue in such network environments. This paper presents a routing scheme for ad hoc CRNs that emphasizes on construction of virtual backbone structure across the network for routing and data transport. The proposed solution features chan...
Conference Paper
Full-text available
Wireless communication in underwater environment is becoming increasingly important and has gained attention as a theme of research. Acoustic communication in underwater environment is the most mature technology for underwater sensor networks (UWSNs). This paper presents a brief overview on the basics of underwater communication with communication...
Article
Full-text available
Flexgrid technology is now considered to be a promising solution for future high-speed network design. In this context, we need a tutorial that covers the key aspects of elastic optical networks. This tutorial paper starts with a brief introduction of the elastic optical network and its unique characteristics. The paper then moves to the architectu...
Article
Wireless Sensor Networks (WSNs) consist of sensor nodes which can be deployed for various operations such as agriculture and environmental sensing, wild life monitoring, health care, military surveillance, industrial control, home automation, security etc. Quality of Service (QoS) is an important issue in wireless sensor networks (WSNs) and providi...
Article
Routing plays a crucial role in provisioning Quality of Service (QoS) over WiFi-based Long Distance (WiLD) mesh networks. Traditional routing protocols normally maintain a single optimal path between each pair of source and destination nodes. In gateway-based mesh networks, the optimal paths between gateway and other nodes often overlap and hence d...
Conference Paper
Full-text available
Recent technological advancements in underwater communications offer new challenges and opportunities for underwater sensor networks (UWSNs). There is an increasing consensus on the requirement to put energy conservation at the top of the research agenda, and as one of the most critical and compelling current research issues. In UWSNs, energy conse...
Conference Paper
Full-text available
In wireless networks, secure authentication protocol should enable a legitimate roaming user to get roaming services from foreign server when he/she is away from home domain. However, a basic authentication protocol requires participation of home server, foreign server and roaming user during the au-thentication between roaming user and foreign ser...
Conference Paper
In this paper, a centralized TDMA-based MAC protocol for multi-hop WiFi-based Long Distance network (WiLD) networks, called 2C, is presented which provides better end-to-end throughput and delay. The possibility of collision which exists in 2P-based MAC protocols due to the loss of synchronization token has been reduced significantly employing tigh...
Article
Full-text available
WiFi is widely being researched to use it beyond its original purpose of short-range communication. These kinds of efforts are stimulated due to its mass production and cost-effectiveness. WiFi-based Long Distance (WiLD) networks envisage changing the rural communication scenario particularly in the undeveloped nations. However, CSMA/CA, the de-fac...
Conference Paper
WiFi-based Long Distance (WiLD) networks are expected to run real-time applications such as Video-conferencing, Telemedicine, E-learning, VoIP (Voice over IP), etc. Providing Quality of Service (QoS) guarantees for various real-time applications in such a resource-constrained network is a challenging issue. The time slots allotted to a node in TDMA...
Conference Paper
Cognitive Radio (CR) seems to be a promising solution to radio spectrum overcrowding problem. Cognitive Radio Network (CRN) allows opportunistic uses of spectrum holes by enabling the coexistence of licensed (primary) users and unlicensed (secondary) users. Data dissemination in a CRN is very useful to propagate non-urgent messages in order to limi...
Article
Dispersion in fiber optic is wavelength dependent and it degrades the quality of service (QoS) in an optical network. Although use of dispersion compensating fiber reduces the effects of dispersion but it is very costly. In this paper, we propose a QoS-aware wavelength assignment (QWA) scheme to improve the quality of service in an optical network...
Conference Paper
Full-text available
The advent of wireless networking, sensor and embedded system technology has given rise to Wireless Sensor Networks (WSN). In WSN, tiny sensor motes manifest the concept of ubiquitous computing by collaborating with each other. Extraction of the information about various events in the field from the data collected by these motes is a crucial stage...
Conference Paper
Full-text available
Traditionally, RSA is being used for authentication and key exchange for symmetric key cryptography (SKC). Improved network security demands forward secrecy also. Even though, RSA, a widely used key exchange approach can not provide forward secrecy, the same can be achieved by making used Elliptic Curve Diffie-Hellman Ephemeral (ECDHE) technique fo...
Article
For the past several years, traffic especially, Internet traffic has been increased tremendously and this growth demands for a high-speed communication network such as optical network. Routing and Wavelength Assignment (RWA) is one of the key tasks for the optical network, due to its information transparency and wavelength reuse characteristics. In...
Conference Paper
Wireless sensor networks (WSN's) rely on various resource constrained nodes with limited energy, range, memory and computational power it is necessary to conserve battery energy so as to extend the life time of the given WSN deployment. In any WSN application measured data is gathered at regular intervals and the same is sent to the Base station (B...
Data
Full-text available
Energy efficient medium access control (MAC) protocol designs for wireless sensor networks (WSNs) have already generated interests among researches due to ever increasing range of applications of WSNs. Nodes in a WSN typically operate unattended with a limited power source, energy efficient operations of the sensor nodes especially at the MAC level...
Article
Full-text available
Energy efficiency in data collection and transmission is always a crucial factor in wireless sensor network (WSN). Unreliability in data transmission is very common for long range communications in WSNs. Factors like fading of channel, interference and radio irregularity further pose a big challenge on the design of energy efficient data transmissi...
Article
Dispersion in optical fiber degrades the quality of signal in optical networks. Although the use of dispersion compensating fiber (DCF) reduces the effects of dispersion, it is expensive and has more propagation loss compared to step-index fiber (SIF). In this paper, we propose a priority based dispersion-reduced wavelength assignment (PDRWA) schem...
Conference Paper
Optimality in energy usage of sensors in wireless sensor network (WSN) is a very crucial matter. Long range communications in WSNs are affected by factors like fading of channel, interference and radio irregularity. Cooperative MIMO (Multiple Input Multiple Output) communication in WSNs proves helpful to solve these problems of long range transmiss...
Article
We propose a heuristic priority based wavelength assignment (HPWA) scheme to minimize the blocking probability. In this scheme, the connection requests having same s–d pair are groomed first and then these groomed connection requests are served for routing and wavelength assignment according to their priority order. The priority order of each groom...
Article
One of the challenging issues in optical networks is call blocking and it increases with the number of connection requests due to the limited number of wavelength channels in each fiber link. In this paper, we propose a priority based routing and wavelength assignment scheme with incorporation of a traffic grooming mechanism (PRWATG) to reduce call...