Method and apparatus for conditioning modulated signals for digi

Details Method and apparatus for conditioning modulated signals for digi Method and apparatus for conditioning modulated signals for digi

1996-04-04

1998-09-08

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

Antinoise or distortion

332103, H04K 102

Patent

active

058056408

ABSTRACT:
A digitally modulated signal is conditioned, such as to facilitate amplification. The digitally modulated signal is derived from an information stream which is mapped onto a symbol constellation to generate a sequence of channel symbols. The sequence of channel symbols is processed to provide a conditioned signal having a signal envelope that avoids signal envelope magnitudes below a threshold value (500). From a signal envelope representing the sequence of channel symbols, symbol interval minimum values are determined as the signal envelope transitions through successive channel symbols of the sequence (510). The conditioned signal is generated by localized adjustment of the signal envelope, such as by insertion of an adjustment pulse, to increase a particular symbol interval minimum value, when that value is below the threshold value (520, 530, 540, 545, 555).

REFERENCES:
patent: 4646326 (1987-02-01), Backof, Jr. et al.

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