1. Dessouky, M., H. Sharshar, and Y. Albagory, "Improving the cellular coverage from a high altitude platform by novel tapered beamforming technique," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 13, 1721-1731, 2007.        Google Scholar

2. Gu, Y. J., et al. "Robust adaptive beamforming for steering vector uncertainties based on equivalent DOAs method," Progress In Electromagnetics Research, Vol. 79, 277-290, 2008.
doi:10.2528/PIER07102202        Google Scholar

3. Dessouky, M., H. Sharshar, and Y. Albagory, "A novel tapered beamforming window for uniform concentric circular arrays," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 14, 2077-2089, 2006.
doi:10.1163/156939306779322701        Google Scholar

4. Abdelaziz, A. A., "Improving the performance of an antenna array by using radar absorbing cover," Progress In Electromagnetics Research Letters, Vol. 1, 129-138, 2008.
doi:10.2528/PIERL07112503        Google Scholar

5. Capineri, L., "Estimation of relative permittivity of shallow soils by using the ground penetrating radar response from different buried targets," Progress In Electromagnetics Research Letters, Vol. 2, 63-71, 2008.        Google Scholar

6. Landesa, L., et al. "Bias of the maximum likelihood DOA estimation from inaccurate knowledge of the antenna array response," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 9, 1205-1217, 2007.        Google Scholar

7. Zainud-Deen, S. H., et al. "Direction of arrival and state of polarization estimation using radial basis function neural network (RBFNN)," Progress In Electromagnetics Research B, Vol. 2, 137-150, 2008.
doi:10.2528/PIERB07111801        Google Scholar

8. Xiao, S., et al. "Spatial focusing characteristics of time reversal UWB pulse transmission with different antenna arrays," Progress In Electromagnetics Research B, Vol. 2, 223-232, 2008.
doi:10.2528/PIERB07112203        Google Scholar

9. Fakoukakis, F. E., et al. "Development of an adaptive and a switched beam smart antenna system for wireless communications," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 3, 399-408, 2006.
doi:10.1163/156939306775701722        Google Scholar

10. Guo, B., Y. Wang, J. Li, P. Stoica, and R. Wu, "Microwave imaging via adaptive beamforming methods for breast cancer detection," Journal of Electromagnetic Waves and Applications, Vol. 20, No. 1, 53-63, 2006.
doi:10.1163/156939306775777350        Google Scholar

11. Vescovo, R., "Beam scanning with null and excitation constraints for linear arrays of antennas," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 2, 267-277, 2007.
doi:10.1163/156939307779378817        Google Scholar

12. Kazemi, S., et al. "Performance improvement in amplitude synthesis of unequally spaced array using least mean square method," Progress In Electromagnetics Research B, Vol. 1, 135-145, 2008.
doi:10.2528/PIERB07103002        Google Scholar

13. Seligson, C. D., "Comments on 'High resolution frequencywavenumber spectrum analysis'," Proc. of the IEEE, Vol. 58, 947-949, 1970.

14. Cox, H., "Resolving power and sensitivity to mismatch of optimum array processors," J. Acoust. Soc. Amer., Vol. 54, No. 3, 771-785, 1973.
doi:10.1121/1.1913659        Google Scholar

15. Mouhamadou, M., P. Vaudon, and M. Rammal, "Smart antenna array patterns synthesis: Null steering and multi-user beamforming by phase control," Progress In Electromagnetics Research, Vol. 60, 95-106, 2006.
doi:10.2528/PIER05112801        Google Scholar

16. Liu, Y.-T. and C.-W. Su, "Wideband omnidirectional operation monopole antenna," Progress In Electromagnetics Research Letters, Vol. 1, 255-261, 2008.
doi:10.2528/PIERL07120903        Google Scholar

17. Cox, H., R. M. Zeskind, and M. H. Owen, "Robust adaptive beamforming," IEEE Trans. Acoust., Vol. 35, No. 10, 1365-1376, 1987.
doi:10.1109/TASSP.1987.1165054        Google Scholar

18. Vorobyov, S. A., A. B. Gershman, and Z. Q. Luo, "Robust adaptive beamforming using worst-case performance optimization: A solution to the signal mismatch problem," IEEE Trans. Signal Processing, Vol. 51, No. 2, 313-324, 2003.
doi:10.1109/TSP.2002.806865        Google Scholar

19. Li, J., P. Stoica, and Z. Wang, "On robust capon beamforming and diagonal loading," IEEE Trans. Signal Processing, Vol. 51, No. 7, 1702-1715, 2003.
doi:10.1109/TSP.2003.812831        Google Scholar

20. Lorenz, R. G. and S. P. Boyd, "Robust minimum variance beamforming," IEEE Trans. Signal Processing, Vol. 53, No. 5, 1684-1696, 2005.
doi:10.1109/TSP.2005.845436        Google Scholar

21. Vorobyov, S. A.Y. Rong, and A. B. Gershman, "Robust adaptive beamforming using probability-constrained optimization," Proc. IEEE Workshop on Statistical Signal Processing, 934-939, 2005.

22. Vorobyov, S. A.A. B. Gershman, and Y. Rong, "On the relationship between the worst-case optimization and probabilityconstrained approaches to Robust adaptive beamforming," Proc. 32nd IEEE Int. Conference on Acoustics, Vol. 2, 977-980, 2007.

23. Reed, I. S., J. D. Mallett, and L. E. Brennan, "Rapid convergence rate in adaptive arrays," IEEE Trans. Aerospace and Electron. Syst., Vol. 10, No. 6, 853-863, 1974.
doi:10.1109/TAES.1974.307893        Google Scholar

24. Capon, J., "High resolution frequency-wavenumber spectral analysis," Proc. of the IEEE, Vol. 57, No. 8, 1408-1418, 1969.

25. Besson, O. and F. Vincent, "Performance analysis of beamformers using generalized loading of the covariance matrix in the presence of random steering vector errors," IEEE Trans. Signal Processing, Vol. 53, No. 2, 452-459, 2005.
doi:10.1109/TSP.2004.840777        Google Scholar

26. Proakis, J. G., Digital Communications, 4th edition, 2001.

27. Papoulis, A., Probability, R andom Variables, 1991.

28. Boyd, S. and L. Vandenberghe, Convex Optimization, Cambridge university press, 2004.

29. Chang, L. and C. C. Yeh, "Performance of DMI and eigenspacebased beamformers," IEEE Trans. Antennas Propagat., Vol. 40, No. 11, 1336-1347, 1992.
doi:10.1109/8.202711        Google Scholar