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  • 1
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    Interplex: An analysis of optimized power allocations for two and three channel PSK/PM telecommunications systems (1972)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: Optimal design concepts are presented for two- and three-channel telemetry modes in the context of the Mariner Venus-Mercury 1973 mission and the usefulness of interplex modulation techniques is discussed. These ideas are applied as an example to one Mariner Venus-Mercury 1973 telemetry mode to demonstrate that interplex can reduce the required total average power by more than 2 dB in some cases.
    Keywords: COMMUNICATIONS
    Type: JPL Quarterly Tech. Rev., Vol. 2, No. 1; p 143-151
    Format: text
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  • 2
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    Carrier tracking loop performance in the presence of strong CW interference (1979)
    In:  CASI
    Details
    Publication Date: 2006-06-01
    Description: Research on the behavior of the carrier tracking loop exposed to a continuous wave irradiation along with Bruno's closed form of approximation for the loop phase error are described.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 130-137
    Format: text
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  • 3
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    FH/MFSK performance in multitone jamming (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The performance of frequency-hopped (FH) M-ary frequency-shift keyed (MFSK) signals in partial-band noise as analyzed in the open literature. The previous research is extended to the usually more effective class of multitone jamming. Some objectives researched are: (1) To categorize several different multitone jamming strategies; (2) To analyze the performance of FH/MSFK signaling, both uncoded with diversity, assuming a noncoherent energy detection metric with linear combining and perfect jamming state side information, in the presence of worst case interference for each of these multitone categories; and (3) To compare the effectiveness of the various multitone jamming techniques, and contrast the results with the partial band noise jamming case.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Journal on Selected Areas in Communications (ISSN 0733-8716); SAC-3; 627-643
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  • 4
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    Spread spectrum communications. Volume 1, 2 & 3 (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The design and operation of spread-spectrum (SS) communication systems are examined in an introductory text intended for graduate engineering students and practicing engineers. Chapters are devoted to an overview of SS systems, the historical origins of SS, basic concepts and system models, antijam communication systems, pseudonoise generators, coherent direct-sequence systems, noncoherent frequency-hopped systems, coherent and differentially coherent modulation techniques, pseudonoise acquisition and tracking in direct-sequence receivers, time and frequency synchronization of frequency-hopped receivers, low-probability-of-intercept communication, and multiple-access communication. Graphs, diagrams, and photographs are provided.
    Keywords: COMMUNICATIONS AND RADAR
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  • 5
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    Analysis of a discrete spectrum analyzer for the detection of radio frequency interference (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: As the radio frequency spectrum becomes increasingly overcrowded, interference with mission-critical DSN operations is rising at an alarming rate. To alleviate this problem the DSN is developing a wideband surveillance system for on-site detection and identification of potential sources of radio frequency interference (RFI), which will complement the existing frequency coordination activities. The RFI monitoring system is based on a wideband, multi-look discrete spectrum analyzer operating on fast Fourier transform principles. An extensive general statistical analysis is presented of such spectrum analyzers and derives threshold detection performance formulas for signals of interest. These results are then applied to the design of the RFI spectrum analyzer under development.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 83-98
    Format: text
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  • 6
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    Radio frequency interference from near-earth satellites (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A pessimistic statistical model was developed for predicting the extent of radio frequency interference (RF1). Based on the assumptions underlying the model, DSN S-band operations can expect one RF1 interruption every 4.1 days, with the average incident lasting 24 s. This implies that 52 or more such satellites, with uncorrelated orbital trajectories, will cause in excess of 5 min of RF1 per day at a DSN station.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Deep Space Network; p 69-77
    Format: text
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  • 7
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    SETI Pulse Detection Algorithm: Analysis of False-alarm Rates (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-12
    Description: Some earlier work by the Search for Extraterrestrial Intelligence (SETI) Science Working Group (SWG) on the derivation of spectrum analyzer thresholds for a pulse detection algorithm based on an analysis of false alarm rates is extended. The algorithm previously analyzed was intended to detect a finite sequence of i periodically spaced pulses that did not necessarily occupy the entire observation interval. This algorithm would recognize the presence of such a signal only if all i-received pulse powers exceeded a threshold T(i): these thresholds were selected to achieve a desired false alarm rate, independent of i. To simplify the analysis, it was assumed that the pulses were synchronous with the spectrum sample times. This analysis extends the earlier effort to include infinite and/or asynchronous pulse trains. Furthermore, to decrease the possibility of missing an extraterrestrial intelligence signal, the algorithm was modified to detect a pulse train even if some of the received pulse powers fall below the threshold. The analysis employs geometrical arguments that make it conceptually easy to incorporate boundary conditions imposed on the derivation of the false alarm rates. While the exact results can be somewhat complex, simple closed form approximations are derived that produce a negligible loss of accuracy.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: The Telecommun. and Data Acquisition Rept.; p 149-158
    Format: text
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  • 8
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    Strategies for FH/MFSK signaling with diversity in worst-case partial-band noise (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Optimum diversity and worst-case partial-band noise jamming conditions have been derived for noncoherent energy detection of frequency-hopped (FH) M-ary frequency-shift keyed (MFSK) signals using a soft-chip decision suboptimum linear combining metric with perfect jamming-state side information. However, the assumption implicit in previous publications is that the error is first maximized over the jammer's partial-band duty factor for arbitrary diversity, and the result is then minimized over the amount of diversity. This paper shows that if the order of optimization is reversed, different conditions and performance are produced; that is, the previous solution is not a saddlepoint. This introduces some game-theoretic considerations for the communicator and the jammer, the risks and advantages of which are explored.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Journal on Selected Areas in Communications (ISSN 0733-8716); SAC-3; 622-626
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  • 9
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    Carrier tracking loop performance in the presence of strong CW interference (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The analyses of Bruno (1973) and Blanchard (1974, 1975) of the effects of strong radio-frequency interference on the behavior of a phase-locked loop are examined in detail. The lock constraints derived directly from a steady-state trial solution by Bruno and those derived with simplifying assumptions from the same trial solution by Blanchard are compared, and circumstances which may be accommodated by the results of Bruno but not those of Blanchard are pointed out. An explicit approximation is then derived which extends the closed-form approximation of Bruno for the loop phase error to the entire lock region. Results are illustrated for a loop filter representative of a phase-locked loop in a deep space network receiver.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Communications; COM-29; June 198
    Format: text
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  • 10
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    Coded error probability evaluation for antijam communication systems (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: We present a general union-Chernoff bound on the bit error probability for coded communication systems and apply it to examples of antijam systems. The key feature of this bound is the decoupling of the coding aspects of the system from the remaining part of the communication system which includes jamming, suboptimum detectors, and arbitrary decoding metrics which may or may not use jammer state knowledge
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Communications; COM-30; May 1982
    Format: text
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