Pulse or digital communications – Transmitters
Patent
1992-08-31
1995-08-29
Chin, Stephen
Pulse or digital communications
Transmitters
315296, 332104, 332144, 327106, 327107, 327293, H04L 2704, H04L 2712, H04L 2720
Patent
active
054467608
ABSTRACT:
A digital pulse shaping and phase modulation network is used for reducing out-of-band spectral energy. This network is used in conjunction with a NCO (numerically controlled oscillator) which includes a linear phase input port. This circuit converts rectangular data pulses into a user programmed shape. The shape pulses are then modulated onto the carrier via the linear phase port. Depending on the preprogrammed pulse shape, the out-of-band spectral energy is significantly reduced.
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An article entitled "Implementation of Coded Modems" by S. Kato et al., from IEEE Communications Magazine, Dec. 1991, pp. 88-93.
Bienz Richard A.
Morelli Daniel J.
Bogacz Frank J.
Chin Stephen
Le Amanda T.
Motorola Inc.
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