Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2011-08-23
2011-08-23
Ha, Dac (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
08005162
ABSTRACT:
A Dynamic Digital Pre-Distortion (DDPD) system is disclosed to rapidly correct power amplifier (PA) non-linearity and memory effects. To perform pre-distortion, a DDPD engine predistorts an input signal in order to cancel PA nonlinearities as the signal is amplified by the PA. The DDPD engine is implemented as a composite of one linear filter and N−1 high order term linear filters. The bank of linear filters have programmable complex coefficients. To compute the coefficients, samples from the transmit path and a feedback path are captured, and covariance matrices A and B are computed using optimized hardware. After the covariance matrices are computed, Gaussian elimination processing may be employed to compute the coefficients. Mathematical and hardware optimizations may be employed to simplify and reduce the number of multiplication operands and other operations, which can enable the DDPD system to fit within a single chip.
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patent: 2005/0170796 (2005-08-01), Demir et al.
patent: 2005/0180519 (2005-08-01), Betts
Ding, Lei, et al., A Robust Digital Baseband Predistorter Constructed Using Memory Polynoids, School of Electrical and Computing Engineering, Georgia Institute of Technology, pp. 1-23, Mar. 16, 2002.
Raich, Raviv, Nonlinear System Identification and Analysis with Applications to Power Amplifier Modeling and Power Amplifier Predistortion, School of Electrical and Computing Engineering, Georgia Institute of Technology, pp. 1-40, Mar. 2004.
Cai Khiem V.
Cova Armando C.
Khanifar Ahmad
Rutan David B.
Ha Dac
Microelectronics Technology Inc.
Shah Tanmay
The Villamar Firm PLLC
Villamar Carlos R.
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