Method and apparatus for controlling the spectral content of a d

Details Method and apparatus for controlling the spectral content of a d Method and apparatus for controlling the spectral content of a d

1991-12-13

1993-06-01

Cangialosi, Salvatore

Cryptography

Cryptanalysis

H04L 900

Patent

active

052167143

ABSTRACT:
An FDDI transmitting apparatus employs a scrambler to scramble input NRZ data which in turn is input to an NRZI-to-NRZ pre-encoder. This is in turn coupled in series with an NRZ-to-NRZI encoder to produce scrambled FDDI data for transmission whose spectral content is predistorted to minimize spectral content peaks above about 30 MHz. A complementary receiving apparatus employs an NRZI-to-NRZ decoder which, according to the invention, is coupled to an NRZ-to-NRZI postdecoder. This data is thence coupled to a descrambler according to the invention to recover the original data.

REFERENCES:
patent: 4775985 (1988-10-01), Busby
patent: 4782488 (1988-11-01), Anderson

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