International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada / This paper will present and compare several definitions of telemetry radio frequency (RF) signal bandwidth. Measured spectra for different signals will be presented. The bandwidths of these signals will then be determined and measurement methods will be discussed. This discussion will include the effects of spectrum analyzer resolution bandwidth, video bandwidth and detector type. Finally, a proposed spectral mask will be discussed. This spectral mask can be used to calculate the required attenuation for a given frequency offset from the center frequency. The required attenuation is a function of the the bit rate or maximum frequency of interest and the transmitter power. This spectral mask is proposed to be part of the next edition of the Telemetry Standards, Inter-Range Instrumentation Group (IRIG) Standard 106.

International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California / The bit rates of telemetry systems are increasing rapidly. Higher bit rates occupy more spectra and result in decreased link margin. The major signal parameters that affect the spectral occupancy and bit error probability (BEP) of binary pulse code modulation (PCM)/frequency modulation (FM) signals are the bit rate, code, premodulation filter, and peak deviation. The measured spectral occupancy is also affected by the spectrum analyzer (or other measurement equipment) settings. Additional parameters that affect the BEP include the receiver intermediate frequency (IF) filter, the FM demodulator, and the bit detector. This paper will present the effects of these parameters on the measured 99% and -60 dBc bandwidths and the BEP of binary PCM/FM telemetry signals. Normalized BEP and bandwidth curves will be presented.

International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / Shaped BPSK (SBPSK) and Shaped Offset QPSK (SOQPSK), as defined in various MIL standards, are widely employed on SATCOM links because they offer an attractive combination of good spectral efficiency, constant envelope characteristics, and interoperability with legacy equipments. More recently, numerous terrestrial applications of OQPSK and similar waveforms (Feher-patented FQPSK) have been proposed. The present paper describes a simple non-proprietary modification of the MIL-STD SOQPSK waveform which offers spectral containment and detection efficiency comparable to or better than FQPSK-B (Revision A1), while preserving a constant envelope characteristic and backward compatibility with existing equipment.

International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada / The aeronautical telemetry community is investigating alternative modulation methods to the commonly used non-return-to-zero (NRZ) pulse code modulation (PCM)/frequency modulation (FM). This paper outlines the important characteristics being investigated. Measured data comparing the spectral occupancy and bit error probability (BEP) performance of PCM/FM with that of a prototype constant envelope Feher’s quadrature phase shift keying (FQPSK) modulator and demodulator will also be presented. Measured results in several radio frequency bands demonstrate that the 99.99% and -60 dBc bandwidths of filtered FQPSK are only approximately one-half of the corresponding bandwidths of optimized PCM/FM even when the signal is non-linearly amplified. The signal energy per bit to noise power spectral density (E /N ) required for a BEP of 1×10 b 0 -5 for non-optimized FQPSK was approximately 12 dB which is approximately the same as limiter discriminator detected PCM/FM.

International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / One of the charters of the Advanced Range Telemetry (ARTM) program was to develop more spectrally efficient waveforms while trying to maintain similar performance to the legacy waveform, Pulse Code Modulation/Frequency Modulation (PCM/FM). The first step toward this goal was the ARTM Tier I family of waveforms which include Feher patented, quadrature phase shift keying, -B version (FQSPKB) and shaped offset quadrature phase shift keying, Telemetry Group version (SOQPSK-TG). The final step was development of Tier II, an even more spectrally efficient waveform, multi-h Continuous Phase Modulation (CPM). This paper characterizes the performance of this waveform when applied in an airborne telemetry environment and, where appropriate, comparisons are made with existing Tier 0 and Tier I waveforms. The benefits, drawbacks, and trade-offs when applying this waveform in an airborne environment will also be discussed.

Orientador: Prof. Dr. Luiz Henrique Bonani do Nascimento / Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia da Informação, 2016. / As redes ópticas são fundamentais para o transporte de informação, que sofrem um rápido crescimento nos dias atuais. Com o advento de novos serviços, redes sociais, diversos equipamentos conectados, tráfego multimídia, vídeo sob demanda, entre outros, o tráfego de informações tem crescido e as Redes Ópticas têm tido um papel de transporte muito importante garantindo a qualidade dos serviços oferecidos. A tecnologia das redes ópticas elásticas (Elastic Optical Networks (EON)s), trazem novas pesquisas para uma melhor otimização de largura de banda no espectro óptico. O estudo tem a finalidade de avaliar, com o uso de simulação, três novos algoritmos de melhor ocupação espectral desenvolvidos neste trabalho, comparados com o algoritmo First Fit (FF) existente na literatura, em termos de tipos de serviços e número de rotas, utilizando duas topologias físicas distintas. Com os algoritmos de melhor ocupação espectral, será realizada a atribuição de serviços e a organização de todos os espaços (slots) da banda C de 4,4 THz, permitindo um melhor aproveitamento e flexibilidade do espectro total, pois o mesmo apresenta espaços não contíguos de largura de banda ao longo do tempo, gerando a Probabilidade de Bloqueio (Blocking Probability (PB)) e a fragmentação da rede óptica. Os algoritmos propostos apresentaram melhores resultados comparados com o algoritmo FF. / The Optical Networks are fundamental for the transport of information, which are experiencing rapid growth in the present days. With the advent of new services, social networks, several connected equipment, multimedia traffic, video on demand, among others, information traffic has grown and the Optical Networks have played a very important transport role guaranteeing the quality of services offered. The technology of elastic optical networks (EON), bring new research for a better optimization of bandwidth in the optical spectrum. The purpose of this study was to evaluate the use of simulation in three new spectral optimization algorithms developed in this work, compared to the First Fit algorithm existing in the literature, in terms of service types and number of routes, using two different physical topologies. With the algorithms of better spectral occupation, the assignment of services and the organization of all slots of the C band of 4.4 THz will be realized, allowing a better utilization and flexibility of the total spectrum, since the same presents uncontiguous bandwidth spaces over time, generating the Blocking Probability and the fragmentation of the optical network. The proposed algorithms presented better results compared to the First Fit algorithm.