Cryptography – Communication system using cryptography – Wireless communication
Patent
1984-07-18
1987-03-10
Cangialosi, Salvatore
Cryptography
Communication system using cryptography
Wireless communication
375 1, 375106, 375115, 380 35, 380 44, H04K 102, H04J 600
Patent
active
046495495
ABSTRACT:
A system and method are disclosed for synchronizning the linear PN sequences contained in a received spread spectrum signal, characterized by the provision of a resident PN generator that is responsive to the chip rate clock for producing a replica of the PN sequence with arbitrary phase, a running matrix inverse of the matrix (R) formed by n successive observations of the register of the resident generator, and a matrix vector product device for multiplying the running inverse by a column vector of noisy chips, thereby to obtain a plurality of estimates of the phase vector. These estimates are smoothed and averaged to produce the smoothed phase vector (c.sub.j) that is applied to one input of a dot product device that operates in conjunction with the contents of the shift register of the resident generator to produce the properly phased PN sequence, which sequence is then supplied to despreading means for combining the noisy chips with the properly phased PN sequence. The system may be used for range computation, if desired.
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patent: 4355399 (1982-10-01), Timor
patent: 4383323 (1983-05-01), Timor
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patent: 4545061 (1985-10-01), Hilman
patent: 4567588 (1986-01-01), Jerrim
Halpern Peter H.
Haug Paul E.
Koos, Jr. William M.
Mallory Peter E.
Cangialosi Salvatore
Sophisticated Signals and Circuits
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