跳至主要内容

A Discrete Newton's Method for Gain Based Predistorter

Read  full  paper  at:
http://www.scirp.org/journal/PaperInformation.aspx?PaperID=3#.VNMpqCzQrzE

Author(s)   

ABSTRACT
Gain based predistorter (PD) is a highly effective and simple digital baseband predistorter which compensates for the nonlinear distortion of PAs. Lookup table (LUT) is the core of the gain based PD. This paper presents a discrete Newton’s method based adaptive technique to modify LUT. We simplify and convert the hardship of adaptive updating LUT to the roots finding problem for a system of two element real equations on athematics. And we deduce discrete Newton’s method based adaptive iterative formula used for updating LUT. The iterative formula of the proposed method is in real number field, but secant method previously published is in complex number field. So the proposed method reduces the number of real multiplications and is implemented with ease by hardware. Furthermore, computer simulation results verify gain based PD using discrete Newton’s method could rectify nonlinear distortion and improve system performance. Also, the simulation results reveal the proposed method reaches to the stable statement in fewer iteration times and less runtime than secant method.
 
Cite this paper
LIN, X. , JIN, M. and LIU, A. (2008) A Discrete Newton's Method for Gain Based Predistorter. Int'l J. of Communications, Network and System Sciences, 1, 16-21. doi: 10.4236/ijcns.2008.11003.
 
References
[1]J. K. Cavers, “Amplifier Linearization Using a Digital Predistorter with Fast Adaptation and Low Memory Requirements”, IEEE Trans. Veh. Technol.,Vol. 19, No. 4, Nov. 1990, pp. 374-382
 
[2]Won Gi Jeon, Kyung Hi Chang, and Yong Soo Cho,"An Adaptive Data Predistorter of Compensation of Nonlinear Distortion in OFDM System", IEEE Trans. Commun., Vol. 45, No. 10, Oct. 1997, pp.1167-1171.
 
[3]Minglu Jin, Sooyoung Kim, Doseob Ahn, Deock-GilOh, and Jae Moung Kim, "A Fast LUT Predistorter for Power Amplifier in OFDM Systems", The 14th IEEE Intemational Sysmposium on personal Indoor and Mobile Radio Communication Proceedings , Beijing, China, Sep. 2003, pp. 1894-1897
 
[4]Hongxin Zhao, Yiyuan Chen, and Wei Hong, "A Baseband Predistortin Linearizer for RF power amplifier Prototype Simulation and Experimentation", Journal of China Insttiute of Communications, Vol. 21, No. 5, May. 2000, pp.41-47.
 
[5]Shuyue Wu, Xinguang Tian, and Ping Bao, "A Fast Algorithm of the Linearizing Technology of the Adaptive Power Amplifiers", Signal Processnig, Vol.18, No.3, Jun.2002, pp. 254-256.
 
[6]Shuyue Wu, Wenming Guo, Xin Song, and Xinguang Tian, “A New Algorithm of the Linearizing Technology of the Digital Baseband Predistortion”, J. Xiangtan Min. Inst., Vol. 19, No. 1, Mar. 2004, pp. 63-65.
 
[7]Kathleen J. Muhonen, and Mohsen Kavehrad, “Look-Up Table Techniques for Adaptive Digital Predistortion: A Development and Comparison”, IEEE Trans. Veh. Technol., Vol. 49, No. 5, Sep.2000, pp.1995-2000.
 
[8]Chih-Hung Lin, Hsin-Hung Chen, Yung-Yi Wang, and Jiunn-Tsair Chen, “Dynamically Optimum Lookup-Table Spacing for Power Amplifier Predistortion Linearization”, IEEE Trans. Micro. Theory Tech., Vol. 54, No. 5, May.2006, pp. 2118 -2127.
 
[9]Rubiao Xie, and Peiqing Jiang, Nonlinear Numerical Analysis, Press of Shanghai Jiaotong University, Shanghai, China, 1984.
 
[10]A. A. M. Saleh, “Frequency-independent and frequency-dependent nonlinear models of TWT amplifiers”, IEEE Trans. Commun., Vol. COM-29, Nov. 1981, pp. 1715-1720.                               eww150205lx
标签：

评论

发表评论

此博客中的热门博文

Does Immigration Promote the Investment of the Monopolistic Firm?

In the present paper, we examine the effect of increasing uncertainty of immigrants’ growth on the optimal timing of investment of a firm that has a monopolistic power over the labor market. It is revealed that when the uncertainty of immigrants’ growth is more than a threshold level, increasing uncertainty of immigrants’ growth accelerates the optimal timing of firms’ investment and enhances the economic growth, even if the uncertainty of immigrants’ growth is formulated by the geometric Brownian motion, which is in sharp contrast to the standard result that an increase in the uncertainty postpones the optimal timing. With an increase in the immigrants over the past ten years, workforces in the host countries have been growing significantly to the extent that the immigrants represent 70% of the increase in the workforce in Europe, and 47% in the United States as OECD indicates. In the present paper, we attempted to investigate the effect of increased uncertainty caused by the growi...
发表评论
阅读全文

Education Policy Implementation: A Mechanism for Enhancing Primary Education Development in Zanzibar

Education is one of the fundamental rights of individuals; therefore, the government of a country needs to develop and strengthen educational policy and quality as well as to ensure that everyone has equal access to basic education. The improvement of access and quality of education in the world is becoming as an essential factor in development, whereas the basic education (primary school), is acknowledged as a foundation of the higher educational development for every country. To fulfill this goal, governments introduce several policies and procedures; however, it requires some reforms and participation from the politician, policymakers, and other stakeholders to re-examine educational policy so that it can lead to multiplication and betterment of the reforms. Educational reforms actually focus on accountability. A positive educational development and reform is very challenging and needs more effort and strategy on how to use and utilize the resources effectively as such it can achie...
发表评论
阅读全文