A New Generation Method for Spatial-Temporal Correlated MIMO Nakagami Fading Channel

A new generation method for spatial and temporal correlated multiple-input multiple-output (MIMO) Nakagami fading channel is proposed, which has low complexity and is applicable for arbitrary fading parameters and prespecified correlation coefficients of different subchannel. The new scheme can be divided into two steps: (1) generate independent Nakagami fading sequences for each subchannel based on a novel rejection method; (2) introduce the temporal and spatial correlation based on the relationships between Rayleigh, Gamma, and Nakagami random processes. The analysis and simulation results show that the proposed simulator has a good agreement with the theoretical model on fading envelope distribution, spatial-temporal correlation characteristic

Almost rejectionless sampling from Nakagami-m distributions (m ≥ 1)

The Nakagami-m distribution is widely used for the simulation of fading channels in wireless communications. A novel, simple and extremely efficient acceptance-rejection algorithm is introduced for the generation of independent Nakagami-m random variables. The proposed method uses another Nakagami density with a half-integer value of the fading parameter, mp ¼ n/2 ≤ m, as proposal function, from which samples can be drawn exactly and easily. This novel rejection technique is able to work with arbitrary values of m ≥ 1, average path energy, V, and provides a higher acceptance rate than all currently available methods. RESUMEN. Método extremadamente eficiente para generar variables aleatorias de Nakagami (utilizadas para modelar el desvanecimiento en canales de comunicaciones móviles) basado en "rejection sampling"

ОБРАБОТКА ОРТОГОНАЛЬНЫХ ЧАСТОТНО-УПЛОТНЕННЫХ СИГНАЛОВ, ПЕРЕДАВАЕМЫХ ПО КАНАЛАМ СВЯЗИ С ЗАМИРАНИЯМИ

The mathematical analysis of the probabilistic characteristics of signals transmitted through compressed communication channels with orthogonal frequency separation in the presence of fading in the communication channel obeying the Nakagami-m distribution law is carried out in the paper. In contrast to previous studies, the effect of a non-uniform distribution of the fading phase in a communication channel on the probability of signal reception errors is examined. A unified mathematical expression of the generating function of moments is presented for the fading coefficients in the communication channel in the frequency domain, distributed in accordance with the Nakagami-m law with non-uniform phase distributions. Thus, the classical methods for determining the generating function of moments can be directly used to determine the exact mathematical representation of the probability of error receiving signals for various types of modulation and diversity of signals.В работе проводится математический анализ вероятностных характеристик сигналов, передаваемых по уплотненным каналам связи с ортогональным частотным разделением при наличии замираний в канале связи, подчиняющихся закону распределения Накагами-m. В отличие от предыдущих исследований в настоящей работе рассматривается воздействие неоднородного распределения фазы замираний в канале связи на вероятность ошибок приема сигналов. Представлено унифицированное математическое выражение производящей функции моментов для коэффициентов замираний в канале связи в частотной области, распределенных в соответствии с законом Накагами-m с неоднородными распределениями фазы. Таким образом, классические методы определения производящей функции моментов могут непосредственно использоваться для определения точного математического представления вероятности ошибки приема сигналов при различных видах модуляции и разнесении сигналов

Processing of orthogonal frequency-compensated signals transmitted via communication channels with fading

В работе проводится математический анализ вероятностных характеристик сигналов, передаваемых по уплотненным каналам связи с ортогональным частотным разделением при наличии замираний в канале связи, подчиняющихся закону распределения Накагами-m. В отличие от предыдущих исследований в настоящей работе рассматривается воздействие неоднородного распределения фазы замираний в канале связи на вероятность ошибок приема сигналов. Представлено унифицированное математическое выражение производящей функции моментов для коэффициентов замираний в канале связи в частотной области, распределенных в соответствии с законом Накагами-m с неоднородными распределениями фазы. Таким образом, классические методы определения производящей функции моментов могут непосредственно использоваться для определения точного математического представления вероятности ошибки приема сигналов при различных видах модуляции и разнесении сигналов. The mathematical analysis of the probabilistic characteristics of signals transmitted through compressed communication channels with orthogonal frequency separation in the presence of fading in the communication channel obeying the Nakagami-m distribution law is carried out in the paper. In contrast to previous studies, the effect of a non-uniform distribution of the fading phase in a communication channel on the probability of signal reception errors is examined. A unified mathematical expression of the generating function of moments is presented for the fading coefficients in the communication channel in the frequency domain, distributed in accordance with the Nakagami-m law with non-uniform phase distributions. Thus, the classical methods for determining the generating function of moments can be directly used to determine the exact mathematical representation of the probability of error receiving signals for various types of modulation and diversity of signals

ВЕРОЯТНОСТЬ ОШИБОК ПРИ ПРИЕМЕ СИГНАЛОВ ПО УПЛОТНЕННЫМ КАНАЛАМ СВЯЗИ С ОРТОГОНАЛЬНЫМ ЧАСТОТНЫМ РАЗДЕЛЕНИЕМ

A mathematical analysis of the probability of errors in the reception of signals transmitted over compressed communication channels with orthogonal frequency separation in the presence of fading in the communication channel distributed in accordance with the Nakagami-m distribution law is made. Unlike previous publications, the present work considers the effect of non-uniform distribution of the phase of fading in the communication channel on the probability of errors in signal reception. A unified mathematical expression of the generating function of the moments for fading of the communication channel in the frequency domain, distributed according to the Nakagami-m law, is presented for uneven fading phase distributions in the communication channel. Thus, the classical methods of determining the generating function of moments can be used directly to obtain exact mathematical expressions for the probability of signal reception errors for various types of modulation and signal diversity.Проводится математический анализ вероятности ошибок приема сигналов, передаваемых по уплотненным каналам связи с ортогональным частотным разделением при наличии замираний в канале связи, распределенных в соответствии с законом распределения Накагами- m . В отличие от предшествующих публикаций в настоящей работе рассматривается воздействие неравномерного распределения фазы замираний в канале связи на вероятность ошибок приема сигналов. Представлено унифицированное математическое выражение производящей функции моментов для замираний канала связи в частотной области, распределенных в соответствии с законом Накагами- m , при неравномерных распределениях фазы замираний в канале связи. Таким образом, классические методы определения производящей функции моментов могут непосредственно использоваться для получения точных математических выражений вероятности ошибок приема сигналов для различных видов модуляции и разнесения сигналов

Design and performance analysis of Nakagami-m fading channel simulator

Orientador: José Cândido Silveira Santos FilhoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de ComputaçãoResumo: Em comunicações sem fio, o fenômeno de desvanecimento por múltiplos percursos é modelado por meio de várias distribuições estatísticas, como por exemplo, Rayleigh, Rice, Hoyt e Nakagami-m. Este trabalho propõe e analisa um novo esquema de simulação fase-envoltória para canais de desvanecimento do tipo Nakagami-m. As principais vantagens do esquema proposto são (i) permitir valores reais arbitrários do parâmetro de desvanecimento, (ii) corresponder às estatísticas de primeira ordem exatas do modelo Nakagami-m e (iii) fornecer uma excelente aproximação às estatísticas de segunda ordem associadas tradicionalmente ao modelo Nakagami-m. A análise do simulador proposto é feita com base na obtenção de expressões exatas e em forma fechada para estatísticas importantes de segunda ordem, a saber: (i) funções densidade de probabilidade conjuntas envolvendo a envoltória, a fase e suas derivadas temporais, (ii) função densidade de probabilidade de segunda ordem da envoltória, (iii) taxa de cruzamento de nível, (iv) duração média de desvanecimento e (v) taxa de cruzamento de fase. Como subproduto, são também obtidas expressões exatas em forma fechada para a função de distribuição acumulada da fase Nakagami-m e sua inversa. O esquema proposto á baseado na combinação em cascata de dois simuladores existentes para canais Nakagami-m, random-mixture e rank - matching, superando ambos em desempenho. Para efeito de comparação, algumas estatísticas de segunda ordem desconhecidas para estes dois simuladores são também obtidas de forma exata e fechadaAbstract: In wireless communications, the multipath fading phenomenon is modeled by various statistical distributions such as Rayleigh, Rice, Hoyt, and Nakagami-m. This work proposes and analyzes a new phase-envelope simulation scheme for Nakagami- m fading channels. The main advantages of the proposed scheme are (i) to allow for arbitrary real values of the fading parameter, (ii) to exactly match the Nakagami-m first order statistics, and (iii) to closely match the second-order statistics classically assigned to Nakagami-m fading. The analysis of the proposed simulator is performed by deriving exact closed-form expressions for important second-order statistics, namely (i) joint probability density functions involving the envelope, the phase, and their time derivatives, (ii) second-order probability density function of the envelope, (iii) level crossing rate, (iv) average fade duration, and (v) phase crossing rate. As a byproduct, we also obtain exact closed-form expressions for the cumulative distribution function of the Nakagami-m phase and its inverse. The proposed scheme is based on a cascade combination of two existing Nakagami-m fading channel simulators, random - mixture and rank - matching, outperforming the both. For comparison, some unknown second-order statistics of these two simulators are also obtained in exact closed formMestradoTelecomunicações e TelemáticaMestre em Engenharia Elétric

Radio Communications

In the last decades the restless evolution of information and communication technologies (ICT) brought to a deep transformation of our habits. The growth of the Internet and the advances in hardware and software implementations modified our way to communicate and to share information. In this book, an overview of the major issues faced today by researchers in the field of radio communications is given through 35 high quality chapters written by specialists working in universities and research centers all over the world. Various aspects will be deeply discussed: channel modeling, beamforming, multiple antennas, cooperative networks, opportunistic scheduling, advanced admission control, handover management, systems performance assessment, routing issues in mobility conditions, localization, web security. Advanced techniques for the radio resource management will be discussed both in single and multiple radio technologies; either in infrastructure, mesh or ad hoc networks

Abstracts on Radio Direction Finding (1899 - 1995)

The files on this record represent the various databases that originally composed the CD-ROM issue of "Abstracts on Radio Direction Finding" database, which is now part of the Dudley Knox Library's Abstracts and Selected Full Text Documents on Radio Direction Finding (1899 - 1995) Collection. (See Calhoun record https://calhoun.nps.edu/handle/10945/57364 for further information on this collection and the bibliography). Due to issues of technological obsolescence preventing current and future audiences from accessing the bibliography, DKL exported and converted into the three files on this record the various databases contained in the CD-ROM. The contents of these files are: 1) RDFA_CompleteBibliography_xls.zip [RDFA_CompleteBibliography.xls: Metadata for the complete bibliography, in Excel 97-2003 Workbook format; RDFA_Glossary.xls: Glossary of terms, in Excel 97-2003 Workbookformat; RDFA_Biographies.xls: Biographies of leading figures, in Excel 97-2003 Workbook format]; 2) RDFA_CompleteBibliography_csv.zip [RDFA_CompleteBibliography.TXT: Metadata for the complete bibliography, in CSV format; RDFA_Glossary.TXT: Glossary of terms, in CSV format; RDFA_Biographies.TXT: Biographies of leading figures, in CSV format]; 3) RDFA_CompleteBibliography.pdf: A human readable display of the bibliographic data, as a means of double-checking any possible deviations due to conversion

Models and analysis of vocal emissions for biomedical applications

This book of Proceedings collects the papers presented at the 3rd International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications, MAVEBA 2003, held 10-12 December 2003, Firenze, Italy. The workshop is organised every two years, and aims to stimulate contacts between specialists active in research and industrial developments, in the area of voice analysis for biomedical applications. The scope of the Workshop includes all aspects of voice modelling and analysis, ranging from fundamental research to all kinds of biomedical applications and related established and advanced technologies