Accession Number : ADA114033

Title :   Multiplexed Noise Codes - A Unique Code Class.

Descriptive Note : Final rept. 1 Oct 80-1 Oct 81,


Personal Author(s) : Gutleber,Frank S

PDF Url : ADA114033

Report Date : Apr 1982

Pagination or Media Count : 173

Abstract : The contents of this paper comprises a treatise on spread spectrum multiplexed noise codes which were first conceived about 20 years ago but have not received much publicity to date. Multiplexed noise codes are codes formed with mate code pairs which, when orthogonally multiplexed, transmitted, and detected in a matched filter, possess an impulse autocorrelation function (i.e., noise-like codes which compress to a single impulse containing no sidelobes). The fundamental requirement for achieving this desirable result is that the autocorrelation function of the two codes forming a mate pair must be of equal magnitude and opposite sense for all values of time outside of the main lobe. The various fundamental concepts which define the requirements for obtaining lobeless compression, an orthogonal noise code subclass, and basic general code expansion concepts are described and theoretically verified. In addition, a relatively complete coverage of the various unique attributes inherent in multiplexed noise codes is disclosed. In essence, a practical unified theory and explanation of these codes is presented to teach the principles involved and illustrate the magnitude of the gains that are realizable from codes that are capable of compressing to a lobeless impulse and which are available in abundance. The theoretical treatment demonstrates that the concepts and applications are all technically sound.

Descriptors :   *Spread spectrum, *Noise, *Coding, *Pulse compression, Orthogonality, Transmitting, Requirements, Configurations, Test and evaluation, Optimization, Multiple access, Brassboard models, Multiplexing, Matched filters, Sidelobes, Amplitude

Subject Categories : Cybernetics
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE