# Rama Murthy GarimellaMahindra Ecole Centrale, Hyderabad, India · Computer Science and Engineering

Rama Murthy Garimella

## About

181

Publications

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734

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## Publications

Publications (181)

In this research brief, the relationship between eigenvectors (with {+1, -1} components) of a synaptic weight matrix W and the stable/anti-stable states of discrete-time Hopfield associative memory (HAM) is established. Also, the synthesis of W with desired stable/anti-stable states using spectral representation of W in even/odd dimension is discus...

In this research paper, the problem of Incremental Learning is addressed. Based on the idea of extracting features incrementally using Auto-Encoders, CNNs, Deep Learning architectures are proposed. We implemented proposed architectures on Raw dataset (containing collection of main classes and dummy classes) and compared the results with CIFAR10 dat...

In this research paper storage as well as retrieval of 1-D/2-D/3-D information using Hopfield type Associative Memories (AMs) is discussed. Various Artificial Neural Networks(ANN) architectures are proposed. Also, implementational issues associated with those Associative Memories are discussed. Cascade connection of AM and Convolutional Neural Netw...

We study certain properties of the function space of autocorrelation functions of unit, as well as finite state space Continuous Time Markov Chains (CTMCs). It is shown that under particular conditions, the L p norm of the autocorrelation function of arbitrary finite state space CTMCs is infinite. Several interesting inferences are made for point p...

In this paper, motivated by an increasing interest in Cognitive Radio wireless transmission systems, we study a stochastic model of a single node of such a system with underlay transmission and balking. The considered model is essentially a single-server system with an ON–OFF type environment governing the service time intensity and triggering the...

G is Laplacian matrix whose elements are expressed in terms of probabilities. We formally state and prove the properties of Variance Laplacian matrix, G. Some implications of the properties of such matrix to statistics are discussed. It is reasoned that several interesting quadratic forms can be naturally associated with statistical measures such a...

Wireless Sensor Nodes (WSNs) are small in size and have limited energy resources. Recent technological advances have facilitated widespread use of wireless sensor networks in many real world applications. In real life situations WSN has to cover an area or monitor a number of nodes on a plane. Sensor node's coverage range is proportional to their c...

We study certain properties of the function space of autocorrelation functions of Unit Continuous Time Markov Chains (CTMCs). It is shown that under particular conditions, the $L^p$ norm of the autocorrelation function of arbitrary finite state space CTMCs is infinite. Several interesting inferences are made for point processes associated with CTMC...

Sports analytics have become a topic of interest in the field of Artificial intelligence. With the availability of huge volumes of high level data, significant progress has been made in the domain of action recognition in the past. Though video based action recognition has progressed well using state of the art deep learning techniques, its applica...

Cyber Physical System (CPS) involves the integration of the Cyber World and the Physical World. Structured Cyber-Physical Systems such as Wireless Sensor Networks (WSNs), Medical Monitoring, Smart Grids, Process Control Systems, Robotics Systems, Auto-Pilot Avionics, etc. are subjected to intense research and development. Efforts are underway to bu...

Modern-day real-time IoT devices used in domains like automated surveillance, healthcare, augmented/virtual reality, automation and control etc are generating a huge amount of data and are very delay sensitive as well. Due to this, they are becoming bandwidth hungry and require an uninterrupted connectivity/communication channel as well. This gave...

Software Defined IoT infrastructure Proposed System • As the number of IoT devices are rapidly increasing and a huge number of access layer devices are underutilized, we propose a self organized software defined edge controller in internet of things (IoT) infrastructure. • The fundamental idea behind SDN is to have separate control and data planes....

Software Defined IoT infrastructure Proposed System • As the number of IoT devices are rapidly increasing and a huge number of access layer devices are underutilized, we propose a self organized software defined edge controller in internet of things (IoT) infrastructure. • The fundamental idea behind SDN is to have separate control and data planes....

One of the significant criteria of wireless sensor network is energy efficiency. Focused on the energy problem, researchers design a few algorithms based on clustering in the present era but lack of proper mathematically rigor justification. To fill this research gap, a system and method has been proposed with a mathematical proof induced from the...

In this research paper we consider the matrix polynomial equation arising naturally in the equilibrium analysis of a structured G∕M∕1-type Markov process. We obtain an explicit expression for the unknown rate matrix R being 2 × 2 matrix. The method is based on symbolic solution of the determinantal polynomial equation. Using Cayley–Hamilton theorem...

The paper carries out performance analysis of a multiuser full-duplex (FD) communication system. Multiple FD UEs share the same spectrum resources, simultaneously, at both the uplink and downlink. This results in co-channel interference (CCI) at the downlink of a UE from uplink signals of other UEs. This work proposes the use of diversity gain at t...

As the number of IoT devices are rapidly increasing and a
huge number of access layer devices are underutilized, we
propose a self organized software defned edge controller in
internet of things (IoT) infrastructure. Our proposed controller gathers information about all the available resources
and learns the parameters for serving an IoT node in su...

In this paper, we quantitatively (mathematically) reason the energy savings achieved in a wireless sensor grid network, by using circular leveling and sectoring routing algorithm. Due to the energy constraints on the sensor nodes (in terms of transmission and reception of energy) energy awareness has become crucial in networking protocol stack. We...

In this research paper, a novel ordinary quaternionic hopfield type network is proposed and the associated convergence theorem is proved. Also, a novel structured quaternionic recurrent hopfield network is proposed. It is proved that in the parallel mode of operation, such a network converges to a cycle of length 4.

In this research paper, the concept of hyper-spherical/hyperellipsoidal separability is introduced. Method of arriving at the optimal hypersphere (maximizing margin) separating two classes is discussed. By projecting the quantized patterns into higher dimensional space (as in encoders of error correcting code), the patterns are made hypersphericall...

This paper proposes a distributed implementation of spatial modulation (SM) using cognitive radios. In distributed spatial modulation (DSM), multiple relays form a virtual antenna array and assist a source to transmit its information to a destination. The source broadcasts its signal, which is independently demodulated by all the relys. Each of the...

In this paper, we quantitatively reason the energy savings achieved by the levelling and sectoring protocol. Due to the energy constraints on the sensor nodes (in terms of supply of energy), energy awareness has become crucial in networking protocol stack. The understanding of routing protocols along with energy awareness in a network would help in...

Spectrum sensing is a fundamental operation in cognitive radio environment. It gives information about spectrum availability by scanning the bands. Usually a fixed amount of time is given to scan individual bands. Most of the times, historical information about the traffic in the spectrum bands is not used. But this information gives the idea, how...

Massive MIMO, a candidate for 5G technology, promises significant gains in wireless data rates and link reliability by using large numbers of antennas (more than 64) at the base transceiver station (BTS). Extra antennas help by focusing the transmission and reception of signal energy into ever-smaller regions of space. This brings huge improvements...

In this paper, we discuss a full-duplex (FD) communication scenario, where multiple FD user equipments (UEs) share same spectrum resources (or resource blocks) simultaneously. The FD eNodeB deploys digital precoding and successive interference cancellation with optimal ordering algorithm, to allow coexistence of multiple UEs in downlink and uplink,...

Wireless Sensor Nodes (WSNs) are small in size and have limited energy resources. Recent technological advances have facilitated widespread use of wireless sensor networks in many real world applications. In real life situations WSN has to cover an area or monitor a number of nodes on a plane. Sensor node's coverage range is proportional to their c...

The ever increasing demand for communication bandwidth has led to spectrum scarcity. We need to manage spectrum as a scare resource. Better utilization of spectrum is the key requirement for the radio communication systems. The inefficient usage of the existing spectrum can be improved through opportunistic access to the licensed bands without inte...

Heterogeneous Networks (HetNets), a newly evolving paradigm has become a viable solution to the challenges posed by ever increasing traffic in the existing cellular networks. The deployment of a HetNet is a tedious task since it involves overlay of small cells onto macro cells. Given the nature of deployment, interference management is extremely cr...

In the recent years, the subject of spectrum sensing techniques has been well studied in research community, highly motivated by the emergence of cognitive radio architectures. But in practice, given the complexity of proposed spectrum sensing techniques, the implementation of cognitive radio has become a tedious task. Unlike many papers in the lit...

In this research paper, we propose novel features based on information theory for image retrieval. We propose the novel concept of “probabilistic filtering”. We propose a hybrid approach for image retrieval that combines annotation approach with content based image retrieval approach. Also rough set theory is proposed as a tool for audio/video obje...

In this research paper, a novel Convolutional Associative Memory is proposed. In the proposed model, Synapse of each neuron is modeled as a Linear FIR filter. The dynamics of Convolutional Associative Memory is discussed. A new method called Sub-sampling is given. Proof of convergence theorem is discussed. An example depicting the convergence is sh...

In this paper, an analysis is carried out for a method to mitigate the path loss through the dynamic spectrum access (DSA) method. The path loss is a major component which determines the QoS of a wireless link. Its effect is complemented by the presence of obstruction between the transmitter and receiver. The future cellular network (5G) focuses on...

In this paper, an analysis is carried out for a method to mitigate the path
loss through the dynamic spectrum access (DSA) method. The path loss is a major
component which determines the QoS of a wireless link. Its effect is
complemented by the presence of obstruction between the transmitter and
receiver. The future cellular network (5G) focuses on...

In this paper, we propose a transceiver architecture for full-duplex (FD)
eNodeB (eNB) and FD user equipment (UE) transceiver. For FD
communication,.i.e., simultaneous in-band uplink and downlink operation, same
subcarriers can be allocated to UE in both uplink and downlink. Hence, contrary
to traditional LTE, we propose using single-carrier freque...

This paper proposes the revamp of architecture of an eNodeB (eNB) for 5G cellular communication networks capable of opening up the crunched spectrum resources. We have developed a novel priority driven Resource Block (RB) handoff algorithm for Full-Duplex Multi-User MIMO communication, where the eNB creates beams for establishing communication link...

Wireless Sensor Networks are used to perform distributed sensing in various fields like health, military, home etc where the sensor nodes communicate among themselves and do distributed computation over the sensed values to identify the occurrence of an event. The architecture for distributed computation of primitive recursive functions and median...

In this research paper, a complex valued generalization of associative memory synthesized by Hopfield is considered and it is proved that it is impossible to synthesize such a neural network with desired unitary stable states when the dimension of the network (number of neurons) is odd. The linear algebraic structure of such a neural network is dis...

The recent progress in the area of self-interference cancellation (SIC)
design has enabled the development of full-duplex (FD) single and multiple
antenna systems. In this paper, we propose a design for FD eNodeB (eNB) and
user equipment (UE) for 5G networks. The use of FD operation enables
simultaneous in-band uplink and downlink operation and the...

In cellular systems, virtual multiple-input multiple-output (V-MIMO)
technology promises to achieve performance gains comparable to conventional
MIMO. In this paper, we propose cooperative relay selection algorithm based on
machine learning techniques. Willingness of user to cooperate in V-MIMO depends
on his current battery power, time and day alo...

In this paper, a novel statistical approach for nonuniform sampling of a time-limited signal is proposed. Based on dynamic range, the signal is divided uniformly in equal intervals which constitute coarse partition. Then, total number of samples is nonuniformly distributed among the intervals of coarse partition leading to nonuniform sampling. The...

In this paper, we have proposed a cost effective method for rapid restoration of wireless connectivity in disaster hit areas, which face large scale failure of wireless infrastructure. This method includes setting of a reconfigurable Base Transceiver Station (BTS) based on Software Defined Radio (SDR) technology. The setup covers the drawbacks of e...

Femto Cells that are installed in macro cellular network forms a two-tier Heterogeneous network, yielding an interference problem between the two layers. The interference management is of a great concern to deploy femto cells. To address interference issue, we proposed an integrated technique of power control and beam forming without any requiremen...

In this research paper, state space representation of a non-linear dynamical system associated with a linear congruential sequence is discussed. Based on the periodicity of such sequence, it is inferred that the dynamical system exhibits cycles in the state space. The cycle length is determined. A novel model of neuron, called “modulo” neuron is pr...

In this research paper, motivated by the concept of complex hypercube, a novel class of complex Hadamard matrices are proposed. Based on such class of matrices, a novel transform, called complex Hadamard transform is discussed. In the same spirit of this transform, other complex transforms such as complex Haar transform are proposed. It is expected...

Using the principle of parsimony, some interesting systems are modeled as linear systems. In some applications, assumption of time invariance of the system is too restrictive. Thus there are many applications where linear time varying systems naturally arise as the models of system dynamics. There are several formulations of optimal control of line...

This paper presents the research work addressing optimal secure and protected Multicasting in wired and wireless Hierarchical Sensor Networks (HSN). The multicast nodes in a hierarchical set up are associated withâ€ Importance valuesâ€ that are normalized into probabilities. The security constraint imposed is associated with the concept of â€œPrefi...

This paper proposes the architecture of a cognitive base station for 4G cellular communication networks. We have developed a novel priority driven spectrum handoff technique for Multi-User MIMO communication, where the base station creates beams for establishing communication links. Adaptive beamforming methods along with DoA have been used to dyna...

Recent technological advances have facilitated the widespread use of wireless sensor networks in many applications. In real life situations we have to cover or monitor a lot of points/places on plane. Sensor’s range is proportional to their cost, as high cost sensors have higher ranges. In this paper the authors developed a new algorithm for sensor...

Motivated by the application problem of sensor fusion the author introduced
the concept of graded set. It is reasoned that in classification problem
arising in an information system (represented by information table), a novel
set called Granular set naturally arises. It is realized that in any
hierarchical classification problem, Granular set natur...

Mobile Ad-hoc NETworks (MANETs) is a set of mobile nodes that can move around arbitrarily, and communicate with others in a multi-hop fashion without any assistance of base stations. With recent advances in Cognitive Radio (CR) technology, it is possible to apply the Dynamic Spectrum Access model in MANETs. This introduces the concept of Cognitive...

In this paper, we quantitatively (mathematically) reason the energy savings
achieved by the Leveling and Sectoring protocol. Due to the energy constraints
on the sensor nodes (in terms of supply of energy) energy awareness has become
crucial in networking protocol stack. The understanding of routing protocols
along with energy awareness in a networ...

In this research paper, the problem of optimization of a quadratic form over
the convex hull generated by the corners of hypercube is attempted and solved.
It is reasoned that under some conditions, the optimum occurs at the corners of
hypercube. Results related to the computation of global optimum stable state
(an NP hard problem) are discussed. A...

In this research paper, the problem of efficient computation of transient probability distribution of a Continuous Time Markov chain (CTMC) is addressed and a signal processing based approach is proposed. Also CTMCs whose generator matrix is a structured matrix (Toeplitz, Toeplitz-type) are considered and two efficient algorithms for the computatio...

Recent advances in cellular communication systems resulted in a huge increase
in spectrum demand. To meet the requirements of the ever-growing need for
spectrum, efficient utilization of the existing resources is of utmost
importance. Channel Allocation, has thus become an inevitable research topic in
wireless communications. In this paper, we prop...

Wireless Sensor Networks (WSNs) are used to perform distributed sensing in
various fields, such as health, military, home etc. In WSNs, sensor nodes
should communicate among themselves and do distributed computation over the
sensed values to identify the occurrence of an event. This paper assumes the no
memory computation model for sensor nodes, i....

A central challenge in sensor networks is the design of routing protocols that can adapt their behaviour to frequent and rapid changes in the network. The performance of proactive and reactive routing protocols varies with network characteristics, and one protocol may outperform the
other in different network conditions. In this paper, we propose a...

Spectrum Scarcity is a global problem across the world. This paper emphasizes on the fact that a global problem has to be dealt on global basis, not just locally by applying the principle of global cognitive radio,Global Opportunistic Remote Spectrum Access. The Future Internet and Internet of Things literally scare the communication system designe...

In this research paper, state space representation of concurrent, linearly
coupled dynamical systems is discussed. It is reasoned that the Tensor State
Space Representation (TSSR) proposed in [Rama1] is directly applicable in such
a problem. Also some discussion on linearly coupled, concurrent systems
evolving on multiple time scales is included. B...

In the unlicensed band, the notion of primary user and secondary user (To
implement cognitive radio) is not explicit. By dynamic priority assignment we
propose to implement cognitive radio in the unlicensed band. In time critical
events, the data which is most important, has to be given the time slots.
Wireless Sensor nodes in our case are consider...

In this research paper, the problems dealing with sensor network
architecture, sensor fusion are addressed. Time/Computationally optimal network
architectures are investigated. Some novel ideas on sensor fusion are proposed.

Sensors are tiny devices and senses different types of information. The sensing range of each sensor is limited due to its energy holding capability. Active participation of sensors in data transmission to base station minimizes the overall energy consumption and also reduces the overall systems cost. In this regard division of the total sensor fie...

Cooperative and mesh networks are new architectures for network convergence that solve some recent problems such as load balancing, routing, and handover. This chapter is dedicated to recent trends, proposals and architectures for cooperative and mesh networks. In many cases these networks can also be used to save energy, which also makes them ener...

Scarcity of spectrum is increasing not only in cellular communication but also in wireless sensor networks. Adding cognition to the existing wireless sensor network (WSN) infrastructure has helped. As sensor nodes in WSN are limited with constraints like power, efforts are required to increase the lifetime and other performance measures of the netw...

In this technical report, certain interesting classification of arithmetical
functions is proposed. The notion of additively decomposable and
multiplicatively decomposable arithmetical functions is proposed. The concepts
of arithmetical polynomials and arithmetical power series are introduced. Using
these concepts, an interesting Theorem relating a...

In this research paper, weighted / unweighted, directed / undirected graphs
are associated with interesting Discrete Time Markov Chains (DTMCs) as well as
Continuous Time Markov Chains (CTMCs). The equilibrium / transient behaviour of
such Markov chains is studied. Also entropy dynamics (Shannon entropy) of
certain structured Markov chains is inves...

Wireless Sensor Network (WSN) is comprised of small and low-cost sensors deployed in a particular region in order to monitor a phenomena. In this paper, we have addressed some problems, which have significant effects on the performance of WSNs while computing the path from source to the base station. Although in the literature, many MAC protocols f...

In this research paper, structured bi-matrix variate, matrix quadratic
equations are considered. Some lemmas related to determining the eigenvalues of
unknown matrices are proved. Also, a method of determining the diagonalizabe
unknown matrices is provided. The results are generalized to multi-matrix
variate, matrix polynomial equations. Briefly ge...

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