Invention Grant
- Patent Title: Dynamic digital pre-distortion system
- Patent Title (中): 动态数字预失真系统
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Application No.: US13198891Application Date: 2011-08-05
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Publication No.: US08259843B2Publication Date: 2012-09-04
- Inventor: Khiem V. Cai , David B. Rutan , Ahmad Khanifar , Armando C. Cova
- Applicant: Khiem V. Cai , David B. Rutan , Ahmad Khanifar , Armando C. Cova
- Applicant Address: TW Hsinchu
- Assignee: Microelectronics Technology, Inc.
- Current Assignee: Microelectronics Technology, Inc.
- Current Assignee Address: TW Hsinchu
- Agency: The Villamar Firm PLLC
- Agent Carlos R. Villamar
- Main IPC: H04L27/00
- IPC: H04L27/00

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.
Public/Granted literature
- US20110286509A1 DYNAMIC DIGITAL PRE-DISTORTION SYSTEM Public/Granted day:2011-11-24
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