Title :
A family of wavelet-related sequences as a basis for an LPI/D communications system prototype
Author :
Sandberg, S.D. ; Tzannes, M.A. ; Heller, P.N. ; Orr, R.S. ; Pike, C.M. ; Bates, M.L.
Author_Institution :
Aware, Inc., Cambridge, MA, USA
Abstract :
The authors introduce a family of sequences which is well suited for use in covert communications applications which employ direct-sequence spectral spreading, and they discuss a hardware testbed which has been designed to demonstrate a covert communications system prototype that incorporates these sequences. The sequences are constructed using a modified Haar wavelet coefficient matrix, and various properties of the sequences are useful for obtaining a relatively high degree of covertness against radiometric and cyclic feature detection. In addition, the sequences can be designed so that the distribution of sequence sample values approximates that for a sequence drawn from an arbitrary noise background, and the authors describe a scenario in which this attribute leads to enhanced signal covertness
Keywords :
matrix decomposition; military communication; pseudonoise codes; sequences; signal detection; spread spectrum communication; telecommunication equipment testing; test facilities; transforms; wavelet transforms; covert communications; cyclic feature detection; direct-sequence spectral spreading; hardware testbed; low probability of detection; low probability of intercept; modified Haar wavelet coefficient matrix; noise background; prototype; signal covertness; wavelet-related sequences; Aerospace electronics; Application specific integrated circuits; Computer vision; Electronic equipment testing; Hardware; Matrix decomposition; Prototypes; Quadrature phase shift keying; Radiometry; System testing;
Conference_Titel :
Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0953-7
DOI :
10.1109/MILCOM.1993.408610
