Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-08-16
2005-08-16
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C370S320000, C398S078000, C375S136000, C375S135000, C375S147000
Reexamination Certificate
active
06931053
ABSTRACT:
A peak power regulator is disclosed that functions within a Code Division Multiple Access (CDMA) transmitter to reduce peak power spikes within baseband signals, controlling the out-of-band emissions, and maintaining the in-band signal quality within an acceptable degradation. In-phase and quadrature baseband signals are input to an envelope magnitude predictor within the peak power regulator. The envelope magnitude predictor outputs an estimate for the magnitude of the envelope that will be generated when the inputted baseband signals are modulated. This estimate is input to a multiplier that generates a ration by dividing the estimate by a maximum acceptable envelope magnitude. The ratio is subsequently input to a mapping table that outputs a scaling factor sufficient for reducing peak power spikes. The scaling factor is subsequently subtracted from a value of one and multiplied by first delayed versions of the in-phase and quadrature baseband input signals. The outputs from these multiplication operations, after being filtered within lowpass filters to remove out-of-band emissions caused by the operations, are referred to as excess power correction signals. These excess power correction signals are then subtracted from second delayed versions of the in-phase and quadrature baseband input signals to generate in-phase and quadrature baseband output signals.
REFERENCES:
patent: 5727026 (1998-03-01), Beukema
patent: 5838732 (1998-11-01), Carney
patent: 5991618 (1999-11-01), Hall
patent: 6091932 (2000-07-01), Langlais
patent: 6236864 (2001-05-01), McGowan et al.
patent: 6356146 (2002-03-01), Wright et al.
patent: 6590906 (2003-07-01), Ishida et al.
patent: 6654427 (2003-11-01), Ma et al.
patent: 1091516 (2000-04-01), None
patent: 9959265 (1999-05-01), None
patent: 0033477 (1999-11-01), None
patent: 0054428 (2000-03-01), None
patent: 0211283 (2001-08-01), None
Chin Stephen
Nortel Networks Limited
Vartanian Harry
LandOfFree
Peak power and envelope magnitude regulators and CDMA... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Peak power and envelope magnitude regulators and CDMA..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Peak power and envelope magnitude regulators and CDMA... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3523240