NDLI: The use of subcarriers in future dsn missions

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The use of subcarriers in future dsn missions

Content Provider	NASA Technical Reports Server (NTRS)
Author	Shihabi, M. M. Hinedi, S. M. Nguyen, T. M.
Copyright Year	1992
Description	The performance of deep space telemetry signals that employ a residual carrier modulation technique is compared in the presence and absence of a subcarrier. When the subcarrier is present, the performance for the resulting pulse-coded modulation/phase-shift keyed/phase-modulated (PCM/PSK/PM) scheme is evaluated for both sine wave and square wave subcarriers and non-return-to zero (NRZ) data. When the subcarrier is absent, the performance for the resulting PCM/PM technique is evaluated for both the NRZ and the bi-phase data format. The comparison is based on telemetry performance as well as bandwidth efficiency. The first criterion is characterized in terms of the symbol error rate (SER) as a function of symbol SNR, loop bandwidth-to-data rate ratio, and modulation index. The bandwidth efficiency is characterized by the occupancy factor. The results of both the analysis and measurements show that when the interference-to-carrier ratio (ICR) is less than -15 dB, the performance degradation in the absence of a subcarrier is negligible. Various combinations of loop bandwidth-to-data rate ratios and modulation indices that achieve this performance are derived and listed. Bandwidth occupancy comparison indicates that PCM/PM/NRZ is the most efficient in this regard. Therefore, by eliminating the subcarrier and using the PCM/PM/NRZ scheme, many advantages can be realized without any sacrifice in performance.
File Size	1523272
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930009726
Archival Resource Key	ark:/13960/t7gr1tp8s
Language	English
Publisher Date	1992-11-15
Access Restriction	Open
Subject Keyword	Communications And Radar Phase Shift Keying Deep Space Network Space Missions Signal To Noise Ratios Bit Error Rate Bandwidth Data Transmission Carrier Waves Sine Waves Telemetry Square Waves Pulse Code Modulation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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