A parallel line clipping algorithm and its implementation on a parallel clipping hardware environment are presented. We first develop a simple theory to show that parallel clipping is possible for all types of line segments. We then present the architecture of a hardware environment based on which parallel clipping is to be implemented. The parallel line clipping algorithm and its implementatio...

There are various methods to improve signal under the clipped environment of voiced sound in the voice signal processing. In the case of the majority of clipping signal restoration, it will be concentrated in sound quality deterioration of low frequency as they are converged into voiced sound from the characteristic viewpoint of sound quality deterioration. Therefore, in the case of clipping of...

Seasonal sucrose metabolism (sucrolysis) was studied in taproot cambial tissues of nursery-grown loblolly pine seedlings to assess the value of top clipping. In sucrose-importing taproots of nonclipped seedlings, sucrose synthase (SS) was the dominant enzyme for sucroti cleavage, and its activity exhibited a distinct seasonal activity. Both root SS activity and growth were most active during fa...

The objective of this experiment was to compare the effects of tail docking and teeth clipping on the growth and behavior of pigs. Pigs (n = 126) from 21 litters (6 pigs/litter) were blocked by birth weight, and assigned at 3 d of age within blocks to either teeth clipping and tail docking (processed) or control (sham-processed). Vocalizations of pigs were recorded during the procedures, and be...

This thesis investigates three possible methods to increase the performance of digital communication systems, with focus on wireless systems, by accounting for some of the channel effects that may occur. The modulation scheme plays an important role in the impact of different channel effects on system performance and this work considers both a single-carrier system and orthogonal frequency-divi...

Nine native bunchgrasses were used to do an experimental restoration/community assembly project of the Blue Ash-Oak Savannah of the Inner Bluegrass Region of Kentucky. Since there are no existing reference systems of a native grassland matrix, nine native grasses were chosen for this project that was likely a part of this system. These nine species include six C3 species, and three C4 species. ...

In wireless communications, 3GPP LTE is one of the solutions to meet the greater transmission data rate demand. One issue inherent to this technology is the PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) modulation. This high PAPR affects of the efficiency of power amplifiers. One approach to mitigate this effect is the Crest Factor Reduction (CFR) techn...

Long term evolution (LTE) is the last step toward the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile telephone networks. LTE has adopted orthogonal frequency division multiplexing (OFDM) for the downlink transmission. OFDM meets the LTE requirement for spectrum flexibility and enables cost-efficient solutions for very wide carriers with high peak...

The Johns Hopkins University/Applied Physics Laboratory Laurel, Maryland ABSTRACT Monte Carlo simulations model the eflects of partial-band jamming on turbo code performance over a slow frequency-hopped spread spectrum signal. Decoders using both hard and soft decision variables corrupted by Additive White Gaussian Noise (A WGN) are considered. Modulations include both Binary Phase Shzjl Keying...

In this paper we present a new error correction approach for a simple peak-to-average power ratio (PAR) reduction scheme for discrete multi-tone (DMT) systems based on coefficient clipping. The proposed method utilizes existing or intentionally placed redundancy in the frequency domain in form of unused subcarriers. Compared to existing PAR reduction algorithms, all signal processing is perform...