Parallel M-band DWT-LMS Algorithm to Improve Convergence Speed of Nonlinear Volterra Equalizer in MQAM System with Nonlinear HPA 


Vol. 32,  No. 7, pp. 627-634, Jul.  2007


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  Abstract

When a higher-order modulation scheme (16QAM or 64QAM) is applied to the communications system using the nonlinear high power amplifier (HPA), the performance can be degraded by the nonlinear distortion of the HPA. The nonlinear distortion can be compensated by the adaptive nonlinear Volterra equalizer using the low-complexity LMS algorithm at the receiver. However, the LMS algorithm shows very slow convergence performance. So, in this paper, the parallel M-band discrete wavelet transformed LMS algorithm is proposed in order to improve the convergence speed. Throughout the computer simulations, it is shown that the convergence performance of the proposed method is superior to that of the conventional time-domain and transform-domain LMS algorithms.

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  Cite this article

[IEEE Style]

Y. S. Choi and H. K. Park, "Parallel M-band DWT-LMS Algorithm to Improve Convergence Speed of Nonlinear Volterra Equalizer in MQAM System with Nonlinear HPA," The Journal of Korean Institute of Communications and Information Sciences, vol. 32, no. 7, pp. 627-634, 2007. DOI: .

[ACM Style]

Yun Seok Choi and Hyung Kun Park. 2007. Parallel M-band DWT-LMS Algorithm to Improve Convergence Speed of Nonlinear Volterra Equalizer in MQAM System with Nonlinear HPA. The Journal of Korean Institute of Communications and Information Sciences, 32, 7, (2007), 627-634. DOI: .

[KICS Style]

Yun Seok Choi and Hyung Kun Park, "Parallel M-band DWT-LMS Algorithm to Improve Convergence Speed of Nonlinear Volterra Equalizer in MQAM System with Nonlinear HPA," The Journal of Korean Institute of Communications and Information Sciences, vol. 32, no. 7, pp. 627-634, 7. 2007.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880