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  • 1
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    Cochannel and Adjacent-Channel Interference in Nonlinear Minimum-Shift-Keyed Satellite System (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The interference susceptibility of a serial-minimum-shift-keyed (SMSK) modulation system to an interfering signal transmitted through a satellite link with cascaded nonlinear elements was investigated through computer simulation. The satellite link evaluated in this study represented NASA's Advanced Communications Technology Satellite (ACTS) system. Specifically, nonlinear characteristics were used that had specified amplitude-modulation to amplitude-modulation and amplitude-modulation to phase-modulation transfer characteristics obtained from the actual ACTS hardware. Two measurement scenarios were analyzed: degradation of an MSK satellite link from cochannel interference and from adjacent-channel interference. Interference was evaluated in terms of the probability of bit error rate (BER) versus energy per bit over noise power density Eb/No.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-106834 , E-9395 , NAS 1.15:106834
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Multiple-access phased array antenna simulator for a digital beam-forming system investigation (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Future versions of data relay satellite systems are currently being planned by NASA. Being given consideration for implementation are on-board digital beamforming techniques which will allow multiple users to simultaneously access a single S-band phased array antenna system. To investigate the potential performance of such a system, a laboratory simulator has been developed at NASA's Lewis Research Center. This paper describes the system simulator, and in particular, the requirements, design and performance of a key subsystem, the phased array antenna simulator, which provides realistic inputs to the digital processor including multiple signals, noise, and nonlinearities.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Journal of Satellite Communications (ISSN 0737-2884); 10; 5; p. 293-297.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Multiple-access phased array antenna simulator for a digital beam forming system investigation (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Future versions of data relay satellite systems are currently being planned by NASA. Being given consideration for implementation are on-board digital beamforming techniques which will allow multiple users to simultaneously access a single S-band phased array antenna system. To investigate the potential performance of such a system, a laboratory simulator has been developed at NASA's Lewis Research Center. This paper describes the system simulator, and in particular, the requirements, design, and performance of a key subsystem, the phased array antenna simulator, which provides realistic inputs to the digital processor including multiple signals, noise, and nonlinearities.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-105422 , E-6838 , NAS 1.15:105422 , International Conference on Digital Satellite Communications; May 18, 1992 - May 22, 1992; Copenhagen; Denmark
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    CW Interference Effects on High Data Rate Transmission Through the ACTS Wideband Channel (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Satellite communications channels are susceptible to various sources of interference. Wideband channels have a proportionally greater probability of receiving interference than narrowband channels. NASA's Advanced Communications Technology Satellite (ACTS) includes a 900 MHz bandwidth hardlimiting transponder which has provided an opportunity for the study of interference effects of wideband channels. A series of interference tests using two independent ACTS ground terminals measured the effects of continuous-wave (CW) uplink interference on the bit-error rate of a 220 Mbps digitally modulated carrier. These results indicate the susceptibility of high data rate transmissions to CW interference and are compared to results obtained with a laboratory hardware-based system simulation and a computer simulation.
    Keywords: Communications and Radar
    Type: NASA-TM-107156 , E-10095 , NAS 1.15:107156 , AIAA Paper 96-1104 , 16th International Communications Satellite Systems Conference; Feb 25, 1996 - Feb 28, 1996; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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