Index Catalog // ScholarsArchive@OSU

A channelized digital receiver design for UWB sytems in a multipath indoor environment

Creator:: Chang, Yuhao
Abstract:: This thesis presents a channelized digital receiver design for UWB sytems in a multipath indoor environment. The UWB technology has been used for commercial and military purposes due to a number of advantages such as low-power consumption, noise-like and carrier free. The energy of UWB signal is spread over a...
Resource Type:: Masters Thesis

A genetic algorithm for the vehicle routing problem with heterogeneous vehicles from multiple depots, allowing multiple visits

Creator:: Lim, Hyunpae
Abstract:: In the thesis, an application of a genetic algorithm (GA) is considered to solve the vehicle routing problem (VRP) which involves heterogeneous vehicles to serve known customer demands from multiple depots achieving the minimum delivery cost, where each customer must be satisfied by one or more visit(s), and each vehicle...
Resource Type:: Masters Thesis

A high power emulation of a wind farm

Creator:: Lalla, Chelsea
Abstract:: As more wind farms are connected to the grid, the variable nature of wind energy begins to influence grid stability. Energy storage could help smooth the variable nature of wind energy. Laboratory demonstration and exploration of the interaction between different energy storage devices and wind energy could help improve and...
Resource Type:: Masters Thesis

A statistical inference framework for finding recurring patterns in large data with applications to energy management

Creator:: You, Zeyu
Abstract:: We consider the problem of finding unknown patterns that are recurring across multiple sets. For example, finding multiple objects that are present in multiple images or a short DNA code that is repeated across multiple DNA sequences. We first consider a simple problem of finding a single unknown pattern in...
Resource Type:: Masters Thesis

Adaptive broadband wireless interference mitigation architecture applying higher order statistics algorithm for computer platform

Creator:: Wang, Qiwei
Abstract:: The broadband wireless interference in a computer platform is resulted by multiple electro-magnetic emission sources. This non-Gaussian interference is proved to be double-sided K-distributed in previous research. With the limitation of transmission power and dimension of the device, interference mitigation is an efficient way to improve received signal bit error...
Resource Type:: Masters Thesis

An efficient frequency controlled PFM for DC-DC converters

Creator:: Pai, Jeff
Abstract:: As more features are being integrated into mobile platforms, the demand for long battery life during standby mode has been increasing. Light load efficiency becomes one of essential features in today's DC-DC converter. The most effective method to improve light load efficiency is to operate the DC-DC converter under pulse-frequency-modulation...
Resource Type:: Masters Thesis

Asymmetric clustering using a register cache

Creator:: Morrison, Roger Allen
Abstract:: Conventional register files spread porting resources uniformly across all registers. This paper proposes a method called Asymmetric Clustering using a Register Cache (ACRC). ACRC utilizes a fast register cache that concentrates valuable register file ports to the most active registers thereby reducing the total register file area and power consumption....
Resource Type:: Masters Thesis

Compensation method of the excess loop delay in continuous-time delta-sigma ADCs based on model matching approach

Creator:: Guo, Jia
Abstract:: Continues-Time (CT) Delta-Sigma (ΔΣ) Analog-to-Digital Converters (ADCs) have one important constrain, namely the excess loop delay. Most previous excess lop delay compensation methods need to know the exact value of the excess loop delay in advance. However, the value of the excess loop delay is a uniformly distribution random variable....
Resource Type:: Masters Thesis

Cost-Age-Time Data Organized Garbage Collection

Creator:: Lee, Dongjun
Abstract:: NAND flash based solid state drives (SSDs) require out-of-place updating due to the characteristics of flash memories. In addition, due to the mismatched granularity between read/write and erase operations, a cleaning policy involving garbage collection and wear leveling has to perform data migration incurring high overhead. Another challenge is that...
Resource Type:: Masters Thesis

Data processing for anomaly detection in web-based applications

Creator:: Gaarudapuram Sriraghavan, Rajagopal
Abstract:: Web applications are popular attack targets. Misuse detection systems use signature databases to detect known attacks. However, it is difficult to keep the database up to date with the rate of discovery of vulnerabilities. They also cannot detect zero-day attacks. By contrast, anomaly detection systems learn the normal behavior of...
Resource Type:: Masters Thesis

Decoding channel coded higher-order QAM signals over Gaussian and Rayleigh fading channels

Creator:: Yang, Yun
Abstract:: In modern digital communication systems, error correction codes (ECC) are widely used and play an important role. The main effect of ECCs is to reduce the transmission error caused by channel noise, thereby protecting data and increasing the quality of information transmission. In addition, high spectral efficiency is desired in...
Resource Type:: Masters Thesis

Diversity combining ARQ over the m(> 2)-ary unidirectional channel

Creator:: Elarief, Noha
Abstract:: In diversity combining automatic repeat request (ARQ), erroneous packets are combined together forming a single, more reliable, packet. In this thesis, we give a diversity combining scheme for the m-ary unidirectional channel. A system using the given scheme with a t-unidirectional error detecting code is able to correct up to...
Resource Type:: Masters Thesis

Instruction fetching, scheduling, and forwarding in a dynamic multithreaded processor

Creator:: Browning, Adam W.
Abstract:: Dynamic multithreaded processors attempt to increase the performance of a single sequential program by dynamically extracting threads from sources such as loop iterations. The scheduling of instructions in such a processor plays a vital role in the amount of thread level parallelism that can be extracted and thus the overall...
Resource Type:: Masters Thesis

Malicious-proof and fair credit-based resource allocation techniques for DSA systems

Creator:: AlShammari, Tamara
Abstract:: In this paper, we propose a credit-based resource allocation technique for dynamic spectrum access (DSA) systems that is robust against malicious and selfi sh behaviors and ensures good overall system fairness performance while also allowing spectrum users to achieve high amounts of service. We also propose a new objective function...
Resource Type:: Masters Thesis

Measurement and characterization of ultra-wideband wireless interconnects within active computing systems

Creator:: Woracheewan, Sirikarn
Abstract:: Ultra-wideband (UWB) radio has become an attractive alternative for wireless communications due to the robustness to multipath fading, low power transmission, mostly-digital implementation, and low cost. Furthermore, short-range, high data-rates applications are possible with UWB radios due to the wide spectral allocations at 3.1 - 10.6 GHz. This thesis presents...
Resource Type:: Masters Thesis

Network coding in relay networks

Creator:: Alban, Eduardo
Abstract:: Transmission over wireless networks presents multiple technical challenges due to noise, interference, fading, power constraints and bandwidth limitation. Different solutions have been propposed to overcome these issues and some of them are treated here. Cooperative diversity has been proposed as an implementation for networks where terminals are restricted to using...
Resource Type:: Masters Thesis

On edge disjoint Hamiltonian cycles in torus and Gaussian networks

Creator:: Alazemi, Fawaz M.
Abstract:: Many algorithms in parallel systems can be easily solved if we can generate a Hamiltonian cycle on the underly network. Finding Hamiltonian cycle is a well known NP-complete problem. For specific instances of regular graphs, such as Torus and Gaussian network, one can easily find Hamiltonian cycles. In this thesis,...
Resource Type:: Masters Thesis

Opportunistic bandwidth sharing through reinforcement learning

Creator:: Venkatraman, Pavithra
Abstract:: The enormous success of wireless technology has recently led to an explosive demand for, and hence a shortage of, bandwidth resources. This expected shortage problem is reported to be primarily due to the inefficient, static nature of current spectrum allocation methods. As an initial step towards solving this shortage problem,...
Resource Type:: Masters Thesis

PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding

Creator:: Chen, Deyan
Abstract:: Optical wireless communication (OWC) is an alternative to radio frequency (RF)communication with a signi cantly larger and unregulated spectrum. In OWC systems, optical orthogonal frequency division multiplexing (O-OFDM) with intensity modulation and direct detection (IM/DD) is commonly used. There are two common signal structures in most OWC systems based on...
Resource Type:: Masters Thesis

Power efficient H.264 video decoding in embedded multiprocessor

Creator:: Kim, Jihong
Abstract:: This thesis presents a novel methodology that enables power efficient video decoding in an embedded system based on MPSoC (Multiprocessor System on Chip). This methodology is a physical combination of parallel processing which reduces power consumption of processors by exploiting thread-level parallelism and Dynamic Voltage Frequency Scaling (DVFS) that allows...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

A channelized digital receiver design for UWB sytems in a multipath indoor environment

A genetic algorithm for the vehicle routing problem with heterogeneous vehicles from multiple depots, allowing multiple visits

A high power emulation of a wind farm

A statistical inference framework for finding recurring patterns in large data with applications to energy management

Adaptive broadband wireless interference mitigation architecture applying higher order statistics algorithm for computer platform

An efficient frequency controlled PFM for DC-DC converters

Asymmetric clustering using a register cache

Compensation method of the excess loop delay in continuous-time delta-sigma ADCs based on model matching approach

Cost-Age-Time Data Organized Garbage Collection

Data processing for anomaly detection in web-based applications

Decoding channel coded higher-order QAM signals over Gaussian and Rayleigh fading channels

Diversity combining ARQ over the m(> 2)-ary unidirectional channel

Instruction fetching, scheduling, and forwarding in a dynamic multithreaded processor

Malicious-proof and fair credit-based resource allocation techniques for DSA systems

Measurement and characterization of ultra-wideband wireless interconnects within active computing systems

Network coding in relay networks

On edge disjoint Hamiltonian cycles in torus and Gaussian networks

Opportunistic bandwidth sharing through reinforcement learning

PAPR Reduction of Optical OFDM Systems with Exponential Companding Transform and Zero Padding

Power efficient H.264 video decoding in embedded multiprocessor

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