Accession Number:

AD0875991

Title:

Error Performance of VLF and LF Receiving Systems with Nonlinear Atmospheric Noise Reduction.

Descriptive Note:

Final technical rept.,

Corporate Author:

WESTINGHOUSE ELECTRIC CORP BOULDER CO GEORESEARCH LAB

Personal Author(s):

Report Date:

1970-09-01

Pagination or Media Count:

261.0

Abstract:

From the measured characteristics of the noise impulses generated by lightning discharges, including those with multiple return strokes, a statistical model is developed to describe the atmospheric noise in the radio channel between 10 kHz and 100 kHz. Using this noise model, error rates are calculated for data systems using binary coherent phase-shift keying and M-ary frequency-shift keying, both coherent and non-coherent. In the systems analyzed the demodulator is preceded by non-linear amplifiers that use peak limiting, hole punching or logarithmic limiting to reduce the noise power. For estimating error rates, the demodulator outputs are derived, and then series approximations are used for the probability distributions of these outputs. The coefficients in each approximating series are developed in terms of the parameters of the receiving system and the statistics of the atmospheric noise modes. Author

Subject Categories:

  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE