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LPI technique based on random complex spreading code

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1 Author(s)
Yoo, J.R. ; Paramax Syst. Corp., Salt Lake City, UT, USA

A squaring circuit (SC) yields the line spectrum of a direct-sequence spread spectrum (DS-SS) signal at the chip rate and its harmonics around DC and ±2fc. The spectrum around DC depends only on the variance of the spreading code amplitude distribution. The line spectrum around ±2fc, however, can be eliminated by a uniform phase code. It is noted that a complex code based on Gaussian amplitude and uniform phase, if used with rectangular chips, is an ideal LPI technique against a SC chip rate detector. Analytical results are confirmed by computer simulation. The focus in the present work is on the SC chip rate detector

Published in:

Military Communications Conference, 1992. MILCOM '92, Conference Record. Communications - Fusing Command, Control and Intelligence., IEEE

Date of Conference:

11-14 Oct 1992