Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2006-03-07
2006-03-07
Vo, Nguyen T. (Department: 2685)
Telecommunications
Transmitter
Noise or interference elimination
C375S296000
Reexamination Certificate
active
07010278
ABSTRACT:
Systems and methods are described for a sideband suppression technique for quadrature modulation using magnitude measurements. Gain imbalance, phase imbalance, or both gain and phase imbalance are corrected in a quadrature modulator. Predetermined voltage levels are applied to one or both of the quadrature modulator input channels and resultant output magnitudes are measured. Then, a gain correction factor, a phase correction factor or both gain and a phase correction factors are determined as a function of the measured output magnitudes. Gain imbalance, phase imbalance or both gain and imbalance are then corrected using the gain and phase correction factors.
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Kirschenmann Mark A.
Talwalkar Sumit A.
Freescale Semiconductor Inc.
Fulbright & Jaworski LLP
Vo Nguyen T.
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