The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON COMMUNICATIONS
Transactions ID Number: 53-656
Full Name: Xiaowei Kong
Position: Ph.D. Candidate
Age: ON
Sex: Male
Address: University of Electronic Science and Technology of China, Chengdu
Country: CHINA
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E-mail address: xiaoweikong@uestc.edu.cn
Other E-mails: xiaoweikong@tom.com
Title of the Paper: closed-loop digital predistorter implementation with loop-delay estimation for RF amplifier linearization based on memory polynomials model
Authors as they appear in the Paper: Xiaowei Kong
Email addresses of all the authors: xiaoweikong@uestc.edu.cn
Number of paper pages: 10
Abstract: This paper, based on memory polynomials model, introduces a Kalman filter algorithm for model parameters extraction and multi-dimensional lookup table structure for digital predistorter implementation. The Kalman filter algorithm is derived from the state-space equation of memory polynomials model. And we adopt the parallel multi-dimensional lookup table to realize the compensation for memory and nonlinearity distortion of amplifier. Furthermore, we also derive amplitude difference correlation function for loop-delay estimation which only needs few multipliers and dramatically saves system resource. Through software simulation, the Kalman filter algorithm significantly outperforms the conventional least mean square algorithm, such as convergence rate and numerical stability. And also the loop-delay estimation algorithm for input and feedback sequence synchronization is validated from software simulation. The hardware experiment validates the algorithm and structure!
can implement on a single Field Programmable Gate Array chip as a closed-loop system and attain adjacent channel power ratio improvement greater than 16dB.
Keywords: Kalman filter algorithm, digital predistorter, multi-dimensional look-up table and loop-delay estimation
EXTENSION of the file: .pdf
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