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  • 1
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    M-ary Poisson detection and optical communications. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: M-ary detection for optical communication investigated for maximum likelihood detection of one of M Poisson processes in background noise
    Keywords: COMMUNICATIONS
    Type: ; STITUTION OF ENGINEE
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The design of a pulse-position modulated optical communication system (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Narrow width pulse-position modulated optical communication system design, determining performance in terms of error probability and information rates
    Keywords: COMMUNICATIONS
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 3
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    Error probabilities in optical PPM receivers with Gaussian mixture densities (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A Gaussian mixture density arises when a discrete variable (e.g., a photodetector count variable) is added to a continuous Gaussian variable (e.g., thermal noise). Making use of some properties of photomultiplier Gaussian mixture distributions, some approximate error probability formulas can be derived. These appear as averages of M-ary orthogonal Gaussian error probabilities. The use of a pure Gaussian assumption is considered, and when properly defined, appears as an accurate upper bound to performance.
    Keywords: OPTICS
    Type: JPL The Telecommun. and Data Acquisition Rept.; p 72-77
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  • 4
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    PPM demodulation for Reed-Solomon decoding for the optical space channel (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The use of Reed-Solomon (RS) block codes over the pulse position modulated (PPM) frames to obtain the largest degree of error correction is considered. Since RS codes can correct both symbol errors and symbol erasures, a question arises as to the best way to demodulate the PPM laser fields in order to generate the input symbols for the RS decoder. The method selected for demodulating (converting the received laser field to digital symbols) defines the erasure and transmitted symbols of the laser link, and therefore determines the work error probabilities of the system. Several demodulating schemes are considered, and the effect of each on RS decoding performance computed. This computation was carried out for various optical receiver models. It is shown that simple threshold decisioning of pulse slots produces performance that degrades as the background noise increases. This is caused by the generation of too many erasures for the RS decoder to handle. A decision scheme, delta-max demodulation which offers improvement over threshold decisioning by redefining the generation of an erasure is proposed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Report; p 47-59
    Format: application/pdf
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  • 5
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    Optical-communication systems for deep-space applications (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of using optical communication systems for data telemetry from deep space vehicles to Earth based receivers is evaluated. Performance analysis shows that practical, photon counting optical systems can transmit data reliably at 30 to 40 dB high rates than existing RF systems, or can be used to extend the communication range by 15 to 20 dB. The advantages of pulse-position modulation (PPM) formats are discussed, and photon counting receiver structures designed for PPM decoding are described. The effects of background interference and weather on receiver performance are evaluated. Some consideration is given to tracking and beam pointing operations, since system performance ultimately depends on the accuracy to which these operations can be carried out. An example of a tracking and pointing system utilizing an optical uplink beacon is presented, and it is shown that microradian beam pointing is within the capabilities of state-of-the-art technology. Recommendations for future theoretical studies and component development programs are presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-162882 , JPL-PUB-80-7
    Format: application/pdf
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  • 6
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    Optical deep space communication via relay satellite (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The possible use of an optical for high rate data transmission from a deep space vehicle to an Earth-orbiting relay satellite while RF links are envisioned for the relay to Earth link was studied. A preliminary link analysis is presented for initial sizing of optical components and power levels, in terms of achievable data rates and feasible range distances. Modulation formats are restricted to pulsed laser operation, involving bot coded and uncoded schemes. The advantage of an optical link over present RF deep space link capabilities is shown. The problems of acquisition, pointing and tracking with narrow optical beams are presented and discussed. Mathematical models of beam trackers are derived, aiding in the design of such systems for minimizing beam pointing errors. The expected orbital geometry between spacecraft and relay satellite, and its impact on beam pointing dynamics are discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-164855 , JPL-PUB-81-40
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  • 7
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    Synchronization using pulse edge tracking in optical pulse-position modulated communication systems (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Communications; COM-22; Oct. 197
    Format: text
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  • 8
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    The effect of timing errors in optical digital systems. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The use of digital transmission with narrow light pulses appears attractive for data communications, but carries with it a stringent requirement on system bit timing. The effects of imperfect timing in direct-detection (noncoherent) optical binary systems are investigated using both pulse-position modulation and on-off keying for bit transmission. Particular emphasis is placed on specification of timing accuracy and an examination of system degradation when this accuracy is not attained. Bit error probabilities are shown as a function of timing errors from which average error probabilities can be computed for specific synchronization methods. Of significance is the presence of a residual or irreducible error probability in both systems, due entirely to the timing system, which cannot be overcome by the data channel.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-20; Apr. 197
    Format: text
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  • 9
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    Photon counting and Laguerre detection. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In this correspondence maximum-likelihood binary detection theory is applied to an incoherent optical system model employing photodetectors governed by Laguerre counting statistics. It is shown that a maximum-likelihood Laguerre detector corresponds to a count comparison over each signaling interval. Laguerre error probabilities are presented and compared with those for Poisson counting.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Information Theory; IT-18; Jan. 197
    Format: text
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  • 10
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    Error probabilities for maximum likelihood detection of M-ary Poisson processes in Poisson noise (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Error probabilities for maximum signal detection in presence of Poisson noise
    Keywords: COMMUNICATIONS
    Type: NASA-TN-D-4721
    Format: application/pdf
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