Sub-baud codingIn a spread-spectrum communication system, a data sequence of +1's and -1's is expanded into a sequence of +x's (bottom bar) and -x's (bottom bar) where x (bottom bar) is a length n sequence of +1's and -1's. A sub-baud code is the assignment of a different such baud sequence to each of M users with the objective of reducing interference between users. It is shown that this interference can be described in terms of the even and odd correlation functions between pairs of sequences. A technique for deriving sub-baud codes from cyclic error-correcting codes is given, and a theorem proved which bounds the quality of the resultant code. A specific such cyclic code construction procedure is given which, for any M, yields a sub-baud code for which the mutual interference can be made arbitrarily small by choosing n sufficiently large.
Document ID
19760063492
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Massey, J. L. (Notre Dame Univ. IN, United States)
Uhran, J. J. (Notre Dame, University Notre Dame, Ind., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Cybernetics
Meeting Information
Meeting: Annual Allerton Conference on Circuit and System Theory