10,348 research outputs found

    The Statistical Loop Analyzer (SLA)

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    The statistical loop analyzer (SLA) is designed to automatically measure the acquisition, tracking and frequency stability performance characteristics of symbol synchronizers, code synchronizers, carrier tracking loops, and coherent transponders. Automated phase lock and system level tests can also be made using the SLA. Standard baseband, carrier and spread spectrum modulation techniques can be accomodated. Through the SLA's phase error jitter and cycle slip measurements the acquisition and tracking thresholds of the unit under test are determined; any false phase and frequency lock events are statistically analyzed and reported in the SLA output in probabilistic terms. Automated signal drop out tests can be performed in order to trouble shoot algorithms and evaluate the reacquisition statistics of the unit under test. Cycle slip rates and cycle slip probabilities can be measured using the SLA. These measurements, combined with bit error probability measurements, are all that are needed to fully characterize the acquisition and tracking performance of a digital communication system

    Crime and Punishment in Translation: Raskolnikov Redeemed

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    Until one determined, nearly blind housewife came onto the literary scene, most Westerners had never heard of Dostoevsky without having a personal background in the Russian Language. Constance Garnett provided the first comprehensive translations of Dostoevsky, Gogol, Tolstoy, and Turgenev to the English-speaking world; but only after she taught herself the Russian language. Her translations have been continually edited and revised since the early 20th century, and were the most widely read editions for almost 70 years. A recent surge of translations from the husband-wife team of Pevear and Volokhonsky is beginning to change the face of Western understanding of Dostoevsky and his peers—but is this change for the better? The P&V translations (as they are called in literary magazines) remain very literal and are intent on keeping the Russian prose as pure as possible. They do not wish to Anglicize the literature, but many of the P&V critics claim that these translations are butchering the spirit of the Russian text. This debate is igniting some important questions in the world of literary translation. What is more important: textual literalism, or faith to the spirit of the novel? Who is best set to the task of translation: a native Slavophil, such as Volokhonsky, or someone steeped in the target culture that knows what will be palatable to English speakers? In this paper, I want to demonstrate the benefits of reading multiple translations of a novel. I will compare key scenes from 3 to 4 different versions of Crime and Punishment: the McDuff translation (Penguin Classics, read in class); the Sidney Monas translation (Signet Classics, bought by accident—might not use for space); the golden standard Constance Garnett translation (Barnes & Noble Classics, personal copy); and the controversial Pevear/Volokhonsky translation (if I can find it from a library). A broad analysis of these translations will be used to show that Raskolnikov\u27s redemption at the end of the novel is not ambiguous, but rather obvious

    Optimum and suboptimum frequency demodulation

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    Optimum and suboptimum linear demodulators for telemetry communication syste

    Data-aided carrier tracking loops

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    Power in composite signal sidebands is used to enhance signal-to-noise ratio in carrier tracking loop, thereby reducing radio loss and decreasing probability of receiver error. By adding quadrature channel to phase-lock-loop detector circuit of receiver, dc component can be fed back into carrier tracking loop

    A nonlinear-coherence receiver

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    Mathematical analysis and detailed study of generic model for coherent receiver has demonstrated that nonlinear coherence between given biphase-modulated input signal and supplied reference signal can be used in receivers to improve telecommunication systems

    Performance analysis and simulation of the SPS reference phase control system

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    The major elements required in the operation of an SPS which employs retrodirectivity as a means of pointing the beam to Earth include the spacetenna, the rectenna, and the pilot signal transmitter. The phase control system is faced with several problems: (1) path delay variations due to imperfect SPS circular orbits; (2) ionospheric effects; (3) initial phase beam forming; (4) beam pointing; (5) beam safing; (6) high power phase noise effects; and (7) interference. The use of SOLARISM, a computer program to select pilot signal parameters and evaluate SPS performance is described

    Coherent receiver employing nonlinear coherence detection for carrier tracking

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    The concept of nonlinear coherence employed in carrier tracking to improve telecommunications efficiency is disclosed. A generic tracking loop for a coherent receiver is shown having seven principle feedback signals which may be selectively added and applied to a voltage controlled oscillator to produce a reference signal that is phase coherent with a received carrier. An eighth feedback signal whose nonrandom components are coherent with the phase detected and filtered carrier may also be added to exploit the sideband power of the received signal. A ninth feedback signal whose nonrandom components are also coherent with the quadrature phase detected and filtered carrier could be additionally or alternatively included in the composite feedback signal to the voltage controlled oscillator

    Autonomous Integrated Receive System (AIRS) requirements definition. Volume 1: Executive summary

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    Distributed processing in the design and operation of the augmented TDRSS and the succeeding TDAS in the 1990's is discussed with the emphasis on the development of the autonomous integrated receive system (AIRS) for the operation of the S-band single access (SSA) return link in the White Sands ground terminal. This receive system has the capability of self configuration, real-time operation, and self diagnostic. The tasks of Doppler correction, demodulation, detection, and decoding are performed in an integrated manner where useful information are shared and used by ALL portions of AIRS performing these tasks. Operating modes, maintenance, system architecture, and performance characteristics are described
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