Pulse or digital communications – Pulse code modulation – Noise or distortion reduction
Patent
1997-10-24
1999-12-28
Chin, Stephen
Pulse or digital communications
Pulse code modulation
Noise or distortion reduction
370212, 332107, H04B 110
Patent
active
060091215
ABSTRACT:
A method and device for generating a constellation of Pulse Code Modulation (PCM) levels to represent digital data in a communication system. The constellation of Pulse Code Modulation levels are selected to have a total number of PCM levels and an upper power limit that optimizes noise performance. PCM levels are selected to increase the minimum spacing between PCM levels as great as possible while staying within the upper power limit for a constellation having a desired number of PCM levels. To minimize the power level of the selected constellation, constellation points are selected starting from PCM levels at linear values near zero to PCM levels at higher linear values. To improve noise performance, the number of occurrences of the minimum distance between PCM levels is also reduced without exceeding the upper power level. To reduce occurrences of the minimum distance between constellation points, PCM levels at the minimum distance from the previously selected PCM level may be skipped. The number of PCM levels spaced at the minimum distance is thus reduced to an optimum number without exceeding the upper power level.
Lery Scott A.
Waldron Mark A.
3Com Corporation
Chin Stephen
Jiang Lenny
LandOfFree
Method and device for generating signal constellations in PCM sp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for generating signal constellations in PCM sp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for generating signal constellations in PCM sp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2387290