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The impact of NRZ data asymmetry on the performance of a space telemetry system

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1 Author(s)
Nguyen, T.M. ; Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA

The author derives an expression for the power spectral density of an asymmetric nonreturn-to-zero (NRZ) data stream. This formula is used to investigate how the data bandwidth varies with data asymmetry. The threshold levels of undesired spectral components that fall into the carrier tracking loop bandwidth are determined by examining the derived spectral density. Based on this formula, a simple technique is developed for the computation of bit signal-to-noise ratio (SNR) degradation due to data asymmetry. The telemetry bit SNR degradations derived using this technique are compared with the results obtained previously by M.K. Simon et al. (1978) and with measurements by the electronic systems test laboratory (ESTL) at the Lyndon B. Johnson Space Center

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:33 ,  Issue: 4 )

Date of Publication:

Nov 1991

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