Thesis (M.A.)--University of Hawaii at Manoa, 2005. / Includes bibliographical references (leaves 154-160). / v, 160 leaves, bound 29 cm

In this thesis, we investigate the performance of adaptive loading orthogonal frequency division multiplexing (OFDM) under Nakagami fading with maximal ratio combining (MRC) diversity at receiver. We not only expound the principles and structures of the system, but also analyze its performance of the lower bound on the average capacity under Nakagami fading. First, we defined the lower bound on the average capacity under Nakagami fading with ideal MRC diversity. Then, we fixed the values of bit error rate. A maximum rate adaptive loading strategy is derived for uncoded quadrature-amplitude-modulation modulated OFDM. Simple lower bound expressions are provided for average spectral efficiency of the maximum rate adaptive loading OFDM under Nakagami fading channel. Finally, the numerical results will be also shown.

This thesis aims to investigate the incorporation of cooperative techniques in cognitive radio networks over Nakagami-m fading channels. These last years, spectrum sharing mechanisms has gained a lot of interest in the wireless communication domain. Using cooperation in a cognitive set up make the use of spectrum much more efficient. Moreover, it helps to extend the coverage area of the cognitive network and also to reduce the transmitting power and, thus, the generated interference. In this work, we consider two particular scenarios for cooperative cognitive radio systems. The first scenario consider multihop regenerative relaying in an underlay cognitive set up. The cooperation is performed in the secondary system, in the presence of multiple primary users. Both interference power and peak power constraints are taking into account. Closed-form expressions for the statistical characteristics and multiple end- to-end performance metrics are derived. Different scenarios are presented to illustrate the obtained results and Monte Carlo simulations confirm the accuracy of our analytical derivations. In the second part of this work, we consider an overlay cognitive network with the spectrally efficient two-phase two-way relaying protocol. Two relay selection techniques, optimizing both the primary and the secondary communication, are presented. The overall outage performance is investigated and an optimal power allocation scheme, that ameliorate the outage performance of the system, is proposed. Numerical simulations are presented to illustrate and compare the obtained results.

Doctor of Philosophy(PhD) / This dissertation aims to examine the manner in which the concept of autonomy (jiritsu) is treated in modern and contemporary Japanese literature. This examination will be performed by analysing the autonomous attitude of a contemporary Japanese writer Nakagami Kenji (1946–1992). This dissertation focuses on examining Nakagami Kenji’s ambivalent attitude towards his act of writing. We will explore the manner in which his act of writing appears to be a paradox between self-identification and the integration into the collective. Then, we will observe the possibility in which Nakagami’s ambivalent attitude is extended to cover Maruyama Masao’s relative definition of autonomy and Karatani Kōjin’s interpretation of Immanuel Kant’s notion of freedom and responsibility. Nakagami’s attempt is certainly not confined to only his works. The notion of autonomy may be applied to perceive a similar thought that was represented by previous writers. We will also examine various never-ending autonomous attempts expressed by Sakaguchi Ango, Miyazawa Kenji and Nakahara Chūya. Moreover, we will analyse how Nakagami’s distrust of the modern Japanese language and his admiration of the body as an undeniable object are reflected in his major novels in detail and attempt to extend this observation into the works of the theatrical artists in the 1960s such as Betsuyaku Minoru, Kara Jūrō, Hijikata Tatsumi and Terayama Shūji and contemporary women writers such as Tsushima Yūko, Takamura Kaoru, Tawada Yōko and Yoshimoto Banana. These writers and artists struggled to establish their autonomous freedom as they encountered the conflict between their individual bodies that personifies their personal autonomy and the modern Japanese language that confines them in the fixed and submissive roles in present-day Japan. In this dissertation, I would like to conclude that Nakagami Kenji’s ambivalent attitude towards his act of writing can be an eternal self-legislation, that is, his endless attempt to establish autonomous freedom, which evolves from the paradox between the individual (body) and the collective (language).

Doctor of Philosophy(PhD) / This dissertation aims to examine the manner in which the concept of autonomy (jiritsu) is treated in modern and contemporary Japanese literature. This examination will be performed by analysing the autonomous attitude of a contemporary Japanese writer Nakagami Kenji (1946–1992). This dissertation focuses on examining Nakagami Kenji’s ambivalent attitude towards his act of writing. We will explore the manner in which his act of writing appears to be a paradox between self-identification and the integration into the collective. Then, we will observe the possibility in which Nakagami’s ambivalent attitude is extended to cover Maruyama Masao’s relative definition of autonomy and Karatani Kōjin’s interpretation of Immanuel Kant’s notion of freedom and responsibility. Nakagami’s attempt is certainly not confined to only his works. The notion of autonomy may be applied to perceive a similar thought that was represented by previous writers. We will also examine various never-ending autonomous attempts expressed by Sakaguchi Ango, Miyazawa Kenji and Nakahara Chūya. Moreover, we will analyse how Nakagami’s distrust of the modern Japanese language and his admiration of the body as an undeniable object are reflected in his major novels in detail and attempt to extend this observation into the works of the theatrical artists in the 1960s such as Betsuyaku Minoru, Kara Jūrō, Hijikata Tatsumi and Terayama Shūji and contemporary women writers such as Tsushima Yūko, Takamura Kaoru, Tawada Yōko and Yoshimoto Banana. These writers and artists struggled to establish their autonomous freedom as they encountered the conflict between their individual bodies that personifies their personal autonomy and the modern Japanese language that confines them in the fixed and submissive roles in present-day Japan. In this dissertation, I would like to conclude that Nakagami Kenji’s ambivalent attitude towards his act of writing can be an eternal self-legislation, that is, his endless attempt to establish autonomous freedom, which evolves from the paradox between the individual (body) and the collective (language).

No description available.

ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada / While investigating methods for more efficiently allocating the available spectrum researchers noticed that in many geographical locations, there are broad bands of frequencies that are lightly utilized. Such inefficiencies are inevitable with fixed spectral allocation rules. Cognitive Radios actively measure the spectral utilization and adapt their modulation, frequencies, bandwidths, power, etc. to take advantage of these lightly used “spectral holes” or “white spaces”. Much of the research work in cognitive radios has not taken into account some of the challenges faced in the telemetry community-including multipaths and a guaranteed quality of service. This paper highlights how some mathematical models of adaptive modulation discussed extensively in many research papers and textbooks can be used in Cognitive Radios as well.

No description available.

The generalized gamma (GG) distribution is an important model that has proven to be very flexible in practice for modeling data from several areas. This model has important sub-models, such as the Weibull, gamma, lognormal, Nakagami-m distributions, among others. In this work, our main objective is to develop different estimation procedures for the unknown parameters of the generalized gamma distribution and related models (Nakagami-m and gamma), considering both classical and Bayesian approaches. Under the Bayesian approach, we provide in a simple way necessary and sufficient conditions to check whether or not objective priors lead proper posterior distributions for the Nakagami, gamma, and GG distributions. As a result, one can easily check if the obtained posterior is proper or improper directly looking at the behavior of the improper prior. These theorems are applied to different objective priors such as Jeffreyss rule, Jeffreys prior, maximal data information prior and reference priors. Simulation studies were conducted to investigate the performance of the Bayes estimators. Moreover, maximum a posteriori (MAP) estimators for the Nakagami and gamma distribution that have simple closed-form expressions are proposed Numerical results demonstrate that the MAP estimators outperform the existing estimation procedures and produce almost unbiased estimates for the fading parameter even for a small sample size. Finally, a new lifetime distribution that is expressed as a two-component mixture of the GG distribution is presented. / A distribuição gama Generalizada (GG) possui um papel fundamental para modelar dados em diversas áreas. Tal distribuição possui como casos particulares importantes distribuições, tais como, Weibull, Gama, lognormal, Nakagami-m, dentre outras. Nesta tese, tem-se como objetivo principal, considerando as abordagens clássica e Bayesiana, desenvolver diferentes procedimentos de estimação para os parâmetros da distribuição gama generalizada e de alguns dos seus casos particulares dentre eles as distribuições Nakagami-m e Gama. Do ponto de vista Bayesiano, iremos propor de forma simples, condições suficientes e necessárias para verificar se diferentes distribuições a priori não-informativas impróprias conduzem a distribuições posteriori próprias. Tais resultados são apresentados para as distribuições Nakagami-m, gama e gama generalizada. Assim, com a criação de novas prioris não-informativas, para tais modelos, futuros pesquisadores poderão utilizar nossos resultados para verificar se as distribuições a posteriori obtidas são impróprias ou não. Aplicações dos teoremas propostos são apresentados em diferentes prioris objetivas, tais como, a regra de Jeffreys, priori Jeffreys, priori maximal data information e prioris de referência. Iremos também realizar estudos de simulação para investigar a influência destas prioris nas estimativas a posteriori. Além disso, são propostos estimadores de máxima a posteriori em forma fechada para as distribuições Nakagami-m e Gama. Por meio de estudos de simulação verificamos que tais estimadores superam os procedimentos de estimação existentes e produzem estimativas quase não-viciadas para os parâmetros de interesse. Por fim, apresentamos uma nova distribuição obtida considerando um modelo de mistura de distribuições gama generalizada.

L’étude porte sur la question des burakumin, les intouchables japonais, dans deux oeuvres de l’écrivain japonais Nakagami Kenji (1946-1992), lui-même issu de cette communauté. Mille ans de plaisir, recueil de six contes basés sur des récits de vie, et le roman Miracle forment une suite organisée autour des mêmes lieux, des mêmes personnages et des mêmes thèmes. Ils décrivent la condition sociale d’une collectivité mise au ban de la société japonaise malgré sa modernisation. Ils se distinguent par leur caractère d’ethnofiction. Nakagami cherche à réhabiliter les burakumin en valorisant le patrimoine religieux et folklorique dont ils sont dépositaires. Il puise dans les genres traditionnels comme le monogatari ou les contes et légendes du Japon. Il s’inspire également d’auteurs modernes japonais (Mishima, Tanizaki) et d’auteurs étrangers (Faulkner, García-Márquez). À partir de cet intertexte et pour faire barrage à l’occidentalisation, il élabore un style « hybride » digne de la littérature nationale (kokubungaku). Les oeuvres traditionnelles sont réinterprétées dans une esthétique postmoderne ayant une fonction ironique et critique contre l’idéologie impériale répressive qui continue d’alimenter la discrimination envers les burakumin. L’analyse porte sur les procédés qui sous-tendent le projet social et le projet littéraire de l’auteur. Elle se divise en trois parties. La première donne un aperçu biographique de l’auteur et décrit les composantes de son projet social qui consiste à vouloir changer l’image et le statut des burakumin. La deuxième partie décrit les éléments religieux et folkloriques des deux oeuvres et analyse en contexte leur signification ainsi que leur fonction, qui est de mettre en valeur les traditions préservées par les burakumin. La troisième partie montre en quoi le répertoire traditionnel (monogatari) et les intertextes sont mis au service du projet littéraire proprement dit. / This study addresses the issue of burakumin, Japanese untouchable or social outcast, in the works of the Japanese novelist Nakagami Kenji (1946-1992), who had himself come from this community. Together, A Thousand Years of Pleasure, a collection of six tales based on life stories, and the novel Miracle, form a continuum articulated around the same places, characters and themes. They describe the social condition of a community exiled by the Japanese society in spite of its modernization and stand out as works of the ethnofiction genre. Nakagami tries to rehabilitate the burakumin by the valorization of the religious and folk heritage of which they are the custodians. He draws from the traditional works such as monogatari, the folk tales and legends of Japan. He also draws from contemporary Japanese authors (Mishima, Tanizaki) as well as from foreign ones (Faulkner, García-Márquez). With this intertext as a starting point and to stand against westernization, he elaborates a “hybrid” style worthy of the national literature (kokubungaku). The traditional works are reinterpreted with postmodern aesthetics that introduce an ironic and critical tone against the repressive imperial ideology still feeding discrimination towards burakumin. The analysis bears on the processes underlying the social and literary projects of the author. The thesis is divided in three parts. The first one provides a biographic overview of the author`s life and describes the components of his social project which consisted in changing the image and status of burakumin. The second describes the religious and folk elements of both works and analyzes in context their meaning and their function, which is to emphasize the traditions upheld by the burakumin. The third and last part shows how the traditional repertoire (monogatari) and intertexts are used to support the literary project itself.