Techniques and benefits of shaping the pulses of binary sequences with application to spread spectrum radio communications.
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Author
Mavranganis, Panayiotis G.
Date
1979-03Advisor
Myers, Glen
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Show full item recordAbstract
This research is concerned with binary sequences. Such
two-level voltage waveforms are used in some types of spread
spectrum systems. Of interest in this work is the effect
of shaping the normally rectangular pulses of the binary
sequence. An objective is to find and tabulate particular
sequences and specific shapes having desirable autocorrelation
functions and power spectra.
A direct and versatile method of shaping binary sequences
is presented. Photographs of sequences having triangular,
raised sine and ramp shapes are included in the report.
Photographs of the autocorrelation function and spectra of
selected shaped sequences are presented.
The computer programs used to search for sequences of
interest and used to calculate the autocorrelation function
and spectra of particular shaped sequences are described.
Shaped sequences having interesting spectra were discovered.
For example, some spectra have very small side
lobe levels; others have no discernible nulls in the spectra;
some spectra have nulls which are not simply related to
the sequence clock frequency (pulse rate).
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