DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click
HERE to register or log in.
Accession Number:
AD0481412
Title:
A STUDY OF THE SPECTRAL CHARACTERISTICS OF PULSE-POSITION MODULATED WAVEFORMS.
Corporate Author:
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Report Date:
1964-01-01
Abstract:
The power spectral density of a pulse-position modulated PPM waveform is determined in part by certain statistics of the modulating process. In this paper a mathematical model is developed to determine the effects of three different modulating processes upon the power spectral density. The processes considered are the Gaussian, the exponential, and the uniform processes, with statistical independence assumed between the sample values that modulate the PPM waveform. The Gaussian process is also developed for the case in which statistical independence may not be assumed that is, a correlation exists between the sample values of the modulating process. The model will also determine the power spectral density of pulse-amplitude modulated PAM waveforms, or for a combination of PAM and PPM. The mathematical model is reduced to a computer model and computed results are displayed. The design of a pulse-position modulator is shown, and experimental measurements of power spectra are compared with the theoretically determined spectra. The theoretical determination of power spectral density and the actual measurement of spectra of finite-time samples are discussed. Author
Descriptive Note:
Master's thesis,
Pages:
0086
File Size:
0.00MB
