Dr. Navin Kumar serves as Associate Professor at department of Electronics and Communication,Amrita School of Engineering.


Publication Type: Conference Paper
Year of Publication Publication Type Title
2015 Conference Paper R. Sharma, N. Kumar, Gowda, N. B., and Srinivas, T., “Probabilistic prediction based scheduling for delay sensitive traffic in internet of things”, in Procedia Computer Science, 2015, vol. 52, pp. 90-97.[Abstract]

This paper proposes a probabilistic prediction based approach for providing Quality of Service (QoS) to delay sensitive traffic for Internet of Things (IoT). A joint packet scheduling and dynamic bandwidth allocation scheme is proposed to provide service differentiation and preferential treatment to delay sensitive traffic. The scheduler focuses on reducing the waiting time of high priority delay sensitive services in the queue and simultaneously keeping the waiting time of other services within tolerable limits. The scheme uses the difference in probability of average queue length of high priority packets at previous cycle and current cycle to determine the probability of average weight required in the current cycle. This offers optimized bandwidth allocation to all the services by avoiding distribution of excess resources for high priority services and yet guaranteeing the services for it. The performance of the algorithm is investigated using MPEG-4 traffic traces under different system loading. The results show the improved performance with respect to waiting time for scheduling high priority packets and simultaneously keeping tolerable limits for waiting time and packet loss for other services. © 2015 The Authors. Published by Elsevier B.V.

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2015 Conference Paper MaSheeba Kumari, Rao, S. Ab, and N. Kumar, “Characterization of mmWave link for outdoor communications in 5G networks”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 44-49.[Abstract]

A number of issues are being addressed in prospective millimetre wave (mmWave) technology for the design of 5G cellular networks. High atmospheric attenuation in the proposed 60GHz band for 5G system put a limit in the communication range and cell size. The channel characteristics may vary for many different indoor and outdoor scenarios, resulting in differing performance. In this paper, an attempt is made to investigate and characterize the mmWave communication link in a specific scenario of urban area on road surrounded by multistorey buildings. Average received signal level in this scenario is normally the primary metric considered. A ray tracing channel model is used owing to the deterministic nature of the link. This is due to the choice of directional antennas in mmWave communication. A significant fluctuation in the received signal is observed for varied carrier frequencies at different antenna separation. © 2015 IEEE.

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2015 Conference Paper M. Ka Jha, Addanki, Ab, Lakshmi, Y. V. Sc, and N. Kumar, “Channel coding performance of optical MIMO indoor visible light communication”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 97-102.[Abstract]

In this paper, a visible light communication (VLC) in the indoor environment based on MIMO system is investigated and analyzed. An attempt is made to optimize the placement of light emitting diodes (LED) VLC emitter in 4 × 4 MIMO configuration at ceiling and ground floor for the receiver to obtain uniform signal-to-noise ratio (SNR) for the desired bit error rate (BER) in the given area. The system is also optimized for the necessary power transmission from LED emitters for the maximum data rate. Two channel coding techniques repetition code (RC) and spatial modulation (SM) are analyzed and their BER and data rate performance results are presented for different receiver spacing moving in the entire area. The result shows that RC gives almost constant SNR whereas SM offers better SNR ratio for more spacing between receivers. In the case of SM, only one transmitter will transmit at a time. So the SNR value will be very low at other corner of the room. © 2015 IEEE.

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2015 Conference Paper A. Aa Nawandhar, Yamujala, Lb, and N. Kumar, “Image segmentation using thresholding for cell nuclei detection of colon tissue”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 1199-1203.[Abstract]

In this paper, image segmentation process using thresholding technique is discussed. We focus our study for nuclei detection of Hematoxilin Eosin (HE) stained colon tissue for the cancer detection. Detection of cancer cell at early stage is very important and several studies are being carried out. In medical imaging for the processing of microscopic tissue images and especially the detection of cell nuclei is done more and more using digital imagery techniques. However, there are many other techniques varies in complexity and quality of detection. In this paper the result of different thresholding techniques are applied on HE-stained colon tissue to detect cell nuclei in the image. In the proposed method, a binary mask is formed which is of the same size as that of original image. In this binary image, the centre of cell nuceli is represented by white colour and the background in black. This image is superimposed over the original image. The outcome of this is a segmented image to detect the cell nuclei. The process is relatively simple and results are encouraging. © 2015 IEEE.

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2015 Conference Paper Ra Sharma and N. Kumar, “QoS-alert Markov chain based scheduling scheme in internet of things”, in 2015 IEEE Globecom Workshops, GC Wkshps 2015 - Proceedings, 2015.[Abstract]

Guaranteeing quality of service (QoS) to transmit real time applications which are delay sensitive is of utmost importance in Internet of Things (IoT) environment. This paper presents a dynamic Markov Chain based scheduling scheme for ensuring QoS for the delay sensitive traffic in IoT. The traffic is classified into prioritized and non- prioritized traffic. By estimating previous bandwidth allocated to prioritized traffic and the amount of decrease/increase in probability of average queue length of prioritized packets in consecutive cycles, the scheduler dynamically adjusts the percentage of link bandwidth allocated to it in each cycle. This helps in providing guaranteed services to real time traffic in IoT applications and simultaneously provide better throughput for non real time traffic as well. The proposed QoS- alert scheduling mechanism is able to optimize the desired performance in IoT network. For different experiments the simulation is performed which verifies and satisfies the blocking probability requirements of prioritized traffic for IoT data. © 2015 IEEE.

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2014 Conference Paper Ma Anand and N. Kumar, “New, effective and efficient dimming and modulation technique for visible light communication”, in IEEE Vehicular Technology Conference, 2014, vol. 2015-January.[Abstract]

Dimming control function in light emitting diodes (LED) based visible light communication (VLC) is not only important but challenging too. Many interesting techniques are being investigated for different application scenarios. In this paper, an attempt is made to design a new and effective dimming control mechanism which is adaptive as per environmental condition to address successful data communication in case of infrastructure to vehicular (I2V) or vehicle to vehicle (V2V) or vehicle to infrastructure (V2I) mode of communication in intelligent transportation systems (ITS). We developed pulse dual slope amplitude modulation (PDSAM) to address both flickering and dimming in VLC system and combines the properties of slope and amplitude variation resulting in improved bit error rate (BER) performance. © 2014 IEEE.

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