Research Article

An orthogonalized blind algorithm for hybrid of adaptive array and equalizer

  1. Maw-Lin Leou1,*,
  2. Chien-Min Wu1,
  3. Yi-Ching Liaw1,
  4. Hui-Kai Su2

Article first published online: 27 APR 2012

DOI: 10.1002/dac.2349

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How to Cite

Leou, M.-L., Wu, C.-M., Liaw, Y.-C. and Su, H.-K. (2012), An orthogonalized blind algorithm for hybrid of adaptive array and equalizer. Int. J. Commun. Syst.. doi: 10.1002/dac.2349

Author Information

  1. 1

    Department of Computer Science and Information Engineering, Nanhua University, Chia-Yi 622, Taiwan

  2. 2

    Department of Electrical Engineering, National Formosa University, Huwei, Yunlin 632, Taiwan

*Maw-Lin Leou, Department of Computer Science and Information Engineering, NanHua University, No. 55, Sec. 1, Nanhua Rd., Dalin, Chia-Yi 622, Taiwan.
E-mail: mlleou@mail.nhu.edu.tw

Publication History

  1. Article first published online: 27 APR 2012
  2. Manuscript Accepted: 5 MAR 2012
  3. Manuscript Revised: 15 JAN 2012
  4. Manuscript Received: 17 NOV 2010

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Keywords:

  • adaptive array;
  • equalizer;
  • constant modulus algorithm;
  • degrees of freedom;
  • main-beam multipath interference;
  • orthogonalized blind algorithm

SUMMARY

The problems generated by the interference will be more complicated in the future. A combination of adaptive array and equalizer has been employed to solve the problems of interference when an adaptive array alone cannot suppress all the interferences. A constant modules algorithm (CMA) of the combination system was proposed to solve the problems of insufficient degrees of freedom and main-beam multipath interference when no training signal is transmitted. The limitation of the CMA for combination systems is due to its slow rate of convergence. In this paper, an orthogonalized blind algorithm for hybrid of array and equalizer (OBHAE) is proposed to combat the problems of the interference. Because the modified input vector of the adaptive array is orthogonalized by the OBHAE in advance, the convergent rate of the CMA system can be improved by the OBHAE. When the coherent interference presents, the performance of the system will be degraded. In this paper, an orthogonalized spatial smoothing blind (OSSB) algorithm is proposed to further enhance the cancellation of the coherent interference. In the OSSB, we combine the OBHAE with the spatial smoothing method to combat the coherent interference problem. Simulation results are presented to demonstrate the merits of the OBHAE and the OSSB. Copyright © 2012 John Wiley & Sons, Ltd.

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