Analysis of a pseudo-noise addressing system for multiple access communication with applications of error-correcting codes.
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Authors
Bull, Oscar M.
Subjects
Advisors
Cotton, Mitchell
Marmont, George
Date of Issue
1970-06
Date
Publisher
Monterey, California ; Naval Postgraduate School
Language
en_US
Abstract
This thesis describes several modulation schemes to be
used in a random access discrete address (RADA) system. This
RADA system uses only one common frequency as carrier, and no
synchronization of the net is supposed. Recognition of the
transmissions between pairs of talkers involves the use of
pseudo-random sequences as individual addresses of each
subscriber. Detection of a particular pseudo-random sequence, contaminated
by the noise formed by the simultaneous transmissions of
other sequences, is accomplished by correlation methods. A comparative study is presented for the transmission of
the information by the RADA system. The following methods
are described and analyzed: an M-ary system, where the information
is represented by cyclic shifts of the pseudo-random
sequence used as the recipient's address, and pulse code modulation
(PCM) where the information is represented by a "1" or "0". Finally, the effect of encoding the information digits
via error-correcting codes is investigated. Here, use of
cyclic block codes and convolutional codes are presented.
It is concluded that the use of convolutional codes would
improve the performance of RADA systems.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School