Accession Number:

ADA048454

Title:

Quadratic Multiplexing--A New Method for Secure Communication.

Descriptive Note:

Technical rept.,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG

Personal Author(s):

• Hinich,Melvin J.

Report Date:

1977-12-01

Pagination or Media Count:

16.0

Abstract:

A secure digital multiplexing technique is presented which uses a pseudo-random process with a fundamental cycle length N. The method can handle D N signal sequences of length M N. The SNRs of the de-multiplexed signals is N4DM for large N, even if the additive noise power is large. The de-multiplexer must compute the discrete Fourier transform of the pseudo-random sequence that is used to encode the signals. Information is carried in the phase differences between the frequency components of the multiplexed signal. De-multiplexing requires at least DMNlog2N arithmetic calculations. Author

Descriptors:

• *MULTIPLEXING
• *SECURE COMMUNICATIONS
• FOURIER TRANSFORMATION
• DIGITAL SYSTEMS
• SIGNAL TO NOISE RATIO
• PSEUDO RANDOM SEQUENCES

Subject Categories:

• Cybernetics
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE