Browse > Article
http://dx.doi.org/10.5573/ieek.2013.50.7.052

An Adaptive Blind Equalizer Based on Dynamic Error Signal Generation Using Equalized Output State  

Oh, Kil Nam (Dept. of Optical Communications Engineering, Gwangju University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.7, 2013 , pp. 52-58 More about this Journal
Abstract
This paper proposes an adaptive algorithm based on a method of dynamic error signal generation suitable for signal state by examining the equalizer output signal in blind equalization. In the proposed method, it estimates the error signals using single modulus and multiple modulus each effective to the early stage of equalization or steady-state, and it generates a new error signal from the two error estimates. Two equalizer structures are implemented and their performances are compared: 1-equalizer structure that generates a new error signal by combining the two error estimates weightedly and updates the equalizer using this, and 2-equalizer structure that updates two equalizers respectively depending on the weights of the two error signals. In the proposed method, as the error signals were generated optimally before and after the initial convergence respectively, it was confirmed by computer simulations that the equalizer was updated effectively.
Keywords
Error signal; Dynamic selection; Initial convergence; Single modulus; Multiple modulus;
Citations & Related Records
연도 인용수 순위
  • Reference
1 L. He, M.G. Amin, C. Reed, Jr., and R.C. Malkemes, "A hybrid adaptive blind equalization algorithm for QAM signals in wireless communications," IEEE Trans. Signal Processing, vol. 52, no. 7, pp. 2058-2069, July 2004.   DOI   ScienceOn
2 J.R. Treichler and B.G. Agee, "A new approach to multipath correction of constant modulus signals," IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-28, pp. 459-472, Apr. 1983.
3 K.N. Oh, "Single/multilevel modulus algorithm for blind equalization of QAM signals," IEICE Trans. Fundamentals, vol. E80-A, no. 6, pp. 1033-1039, June 1997.
4 W. Sethares, G.A. Rey, and C.R. Johnson, Jr.,"Approaches to blind equalization of signals with multiple modulus," ICASSP-89, pp. 972- 975, May 1989.
5 M.J. Ready and R.P. Gooch, "Blind equalization based on radius directed adaptation," ICASSP- 90, pp. 1699-1702, Apr. 1990.
6 V. Weerackody and S.A. Kassam, "Dual-mode type algorithms for blind equalization," IEEE Trans. Commun., vol. COM-42, pp. 22-28, Jan. 1994.
7 L.M. Garth, J. Yang, and J.-J. Werner, "Blind equalization algorithms for dual-mode CAP- QAM reception," IEEE Trans. Commun., vol. COM-49, no. 3, pp. 455-466, March 2001.
8 J.-T. Yuan and T.-C. Lin, "Equalization and carrier phase recovery of CMA and MMA in blind adaptive receivers," IEEE Trans. Signal Processing, vol. 58, no. 6, pp. 3206-3217, June 2010.   DOI   ScienceOn
9 F.C.C. De Castro, M.C.F. De Castro and D.S. Arantes, "Concurrent blind deconvolution for channel equalization," Proc. ICC '2001, vol. 2, pp. 366-371, June 2001.
10 G. Picchi and G. Prati, "Blind equalization and carrier recovery using a "Stop-and-Go" decision-directed algorithm," IEEE Trans. Commun., vol. COM-43, pp. 877-887, Sep. 1987.